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DATA SHEET
MOS INTEGRATED CIRCUIT
PD43256B-X
256K-BIT CMOS STATIC RAM 32K-WORD BY 8-BIT
EXTENDED TEMPERATURE OPERATION
Description
The PD43256B-X is a high speed, low power, and 262,144 bits (32,768 words by 8 bits) CMOS static RAM. The PD43256B-X is an extended-operating-temperature version of the PD43256B (X version : TA = -25 to +85C). And A and B versions are low voltage operations. Battery backup is available. The PD43256B-X is packed in 28-pin PLASTIC TSOP (I) (8 x 13.4 mm).
Features
* 32,768 words by 8 bits organization * Fast access time: 70, 85, 100, 120, 150 ns (MAX.) * Operating ambient temperature: TA = -25 to +85 C * Low voltage operation (A version: VCC = 3.0 to 5.5 V, B version: VCC = 2.7 to 5.5 V) * Low VCC data retention: 2.0 V (MIN.) * /OE input for easy application
Part number Access time ns (MAX.) Operating supply Operating ambient voltage V temperature C -25 to +85 At operating mA (MAX.) 45 Supply current At standby At data retention
A (MAX.)
50
A (MAX.) Note1
2
PD43256B-xxX PD43256B-AxxX PD43256B-BxxX
Note2
70, 85 85
Note2
4.5 to 5.5
Note2
, 100, 120
Note2
3.0 to 5.5 2.7 to 5.5 40
100, 120
, 150
Note2
Notes 1. TA 40 C, VCC = 3.0 V 2. 100 ns (MAX.) (VCC = 4.5 to 5.5 V)
The information in this document is subject to change without notice. Before using this document, please confirm that this is the latest version.
Not all products and/or types are available in every country. Please check with an NEC Electronics sales representative for availability and additional information.
Document No. M11012EJ6V0DS00 (6th edition) Date Published June 2006 NS CP (K) Printed in Japan
1995
PD43256B-X
Ordering Information
Part number Package Access time ns (MAX.) Operating supply Operating ambient voltage V temperature C -25 to +85 Remark
PD43256BGW-70X-9JL PD43256BGW-85X-9JL PD43256BGW-A85X-9JL PD43256BGW-A10X-9JL PD43256BGW-A12X-9JL PD43256BGW-B10X-9JL PD43256BGW-B12X-9JL PD43256BGW-B15X-9JL PD43256BGW-70X-9KL PD43256BGW-85X-9KL PD43256BGW-A85X-9KL PD43256BGW-A10X-9KL PD43256BGW-A12X-9KL PD43256BGW-B10X-9KL PD43256BGW-B12X-9KL PD43256BGW-B15X-9KL PD43256BGW-70X-9JL-A PD43256BGW-85X-9JL-A PD43256BGW-A85X-9JL-A PD43256BGW-A10X-9JL-A PD43256BGW-A12X-9JL-A PD43256BGW-B10X-9JL-A PD43256BGW-B12X-9JL-A PD43256BGW-B15X-9JL-A PD43256BGW-70X-9KL-A PD43256BGW-85X-9KL-A PD43256BGW-A85X-9KL-A PD43256BGW-A10X-9KL-A PD43256BGW-A12X-9KL-A PD43256BGW-B10X-9KL-A PD43256BGW-B12X-9KL-A PD43256BGW-B15X-9KL-A
Remark
28-pin PLASTIC TSOP(I) (8x13.4) (Normal bent)
70 85 85 100 120 100 120 150
4.5 to 5.5
3.0 to 5.5
A version
2.7 to 5.5
B version
28-pin PLASTIC TSOP(I) (8x13.4) (Reverse bent)
70 85 85 100 120 100 120 150
4.5 to 5.5
3.0 to 5.5
A version
2.7 to 5.5
B version
28-pin PLASTIC TSOP(I) (8x13.4) (Normal bent)
70 85 85 100 120 100 120 150
4.5 to 5.5
3.0 to 5.5
A version
2.7 to 5.5
B version
28-pin PLASTIC TSOP(I) (8x13.4) (Reverse bent)
70 85 85 100 120 100 120 150
4.5 to 5.5
3.0 to 5.5
A version
2.7 to 5.5
B version
Products with -A at the end of the part number are lead-free products.
2
Data Sheet M11012EJ6V0DS
PD43256B-X
Pin Configurations (Marking Side)
/xxx indicates active low signal. 28-pin PLASTIC TSOP(I) (8x13.4) (Normal bent) [PD43256BGW-xxX-9JL] [PD43256BGW-AxxX-9JL] [PD43256BGW-BxxX-9JL] [PD43256BGW-xxX-9JL-A] [PD43256BGW-AxxX-9JL-A] [PD43256BGW-BxxX-9JL-A]
/OE A11 A9 A8 A13 /WE VCC A14 A12 A7 A6 A5 A4 A3
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
A10 /CS I/O8 I/O7 I/O6 I/O5 I/O4 GND I/O3 I/O2 I/O1 A0 A1 A2
28-pin PLASTIC TSOP(I) (8x13.4) (Reverse bent) [PD43256BGW-xxX-9KL] [PD43256BGW-AxxX-9KL] [PD43256BGW-BxxX-9KL] [PD43256BGW-xxX-9KL-A] [PD43256BGW-AxxX-9KL-A] [PD43256BGW-BxxX-9KL-A]
A10 /CS I/O8 I/O7 I/O6 I/O5 I/O4 GND I/O3 I/O2 I/O1 A0 A1 A2
28 27 26 25 24 23 22 21 20 19 18 17 16 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14
/OE A11 A9 A8 A13 /WE VCC A14 A12 A7 A6 A5 A4 A3
A0 - A14 I/O1 - I/O8 /CS /WE
: Address inputs : Data inputs / outputs : Chip Select : Write Enable
/OE VCC GND
: : :
Output Enable Power supply Ground
Remark Refer to Package Drawings for the 1-pin index mark.
Data Sheet M11012EJ6V0DS
3
PD43256B-X
Block Diagram
A0 A14
Address buffer
Row decoder
Memory cell array 262,144 bits
I/O1 I/O8 Input data controller
Sense amplifier / Switching circuit Column decoder
Output data controller
Address buffer
/CS
/OE /WE VCC GND
Truth Table
/CS H L L L /OE x H x L /WE x H L H Mode Not selected Output disable Write Read DIN DOUT I/O High impedance Supply current ISB ICCA
Remark x : VIH or VIL
4
Data Sheet M11012EJ6V0DS
PD43256B-X
Electrical Specifications
Absolute Maximum Ratings
Parameter Supply voltage Input / Output voltage Operating ambient temperature Storage temperature Symbol VCC VT TA Tstg Condition Rating -0.5 -0.5
Note
Unit V V C C
to +7.0
Note
to VCC + 0.5
-25 to +85 -55 to +125
Note -3.0 V (MIN.) (Pulse width : 50 ns)
Caution Exposing the device to stress above those listed in Absolute Maximum Rating could cause permanent damage. The device is not meant to be operated under conditions outside the limits described in the operational section of this specification. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Recommended Operating Conditions
Parameter Symbol Condition
PD43256B-xxX
MIN. MAX. 5.5 VCC+0.5 +0.6 +85
PD43256B-AxxX
MIN. 3.0 2.4 -0.3
Note
PD43256B-BxxX
MIN. 2.7 2.4 -0.3
Note
Unit
MAX. 5.5 VCC+0.5 +0.4 +85
MAX. 5.5 VCC+0.5 +0.4 +85 V V V C
Supply voltage High level input voltage Low level input voltage Operating ambient temperature
VCC VIH VIL TA
4.5 2.4 -0.3
Note
-25
-25
-25
Note -3.0 V (MIN.) (Pulse width: 50 ns) Capacitance (TA = 25C, f = 1 MHz)
Parameter Input capacitance Input / Output capacitance Symbol CIN CI/O VIN = 0 V VI/O = 0 V Test conditions MIN. TYP. MAX. 5 8 Unit pF pF
Remarks 1. VIN : Input voltage VI/O : Input / Output voltage 2. These parameters are periodically sampled and not 100% tested.
Data Sheet M11012EJ6V0DS
5
PD43256B-X
DC Characteristics (Recommended Operating Conditions Unless Otherwise Noted) (1/2)
Parameter Symbol Test condition
PD43256B-xxX
MIN. TYP. MAX. +1.0 +1.0
Unit
Input leakage current I/O leakage current
ILI ILO
VIN = 0 V to VCC VI/O = 0 V to VCC, /OE = VIH or /CS = VIH or /WE = VIL
-1.0 -1.0
A A
Operating supply current
ICCA1 ICCA2 ICCA3
/CS = VIL, Minimum cycle time, II/O = 0 mA /CS = VIL, II/O = 0 mA /CS 0.2 V, Cycle = 1 MHz, II/O = 0 mA, VIL 0.2 V, VIH VCC - 0.2 V
45 15 15
mA
Standby supply current
ISB ISB1
/CS = VIH /CS VCC - 0.2 V IOH = -1.0 mA IOH = -0.1 mA IOL = 2.1 mA 2.4 VCC-0.5 1.0
3 50
mA
A
V
High level output voltage
VOH1 VOH2
Low level output voltage
VOL
0.4
V
Remarks 1. VIN : Input voltage VI/O : Input / Output voltage 2. These DC characteristics are in common regardless of package types.
6
Data Sheet M11012EJ6V0DS
PD43256B-X
DC Characteristics (Recommended Operating Conditions Unless Otherwise Noted) (2/2)
Parameter Symbol Test condition
PD43256B-AxxX
MIN. TYP. MAX. +1.0 +1.0
PD43256B-BxxX
MIN. -1.0 -1.0 TYP. MAX. +1.0 +1.0
Unit
Input leakage current I/O leakage current
ILI ILO
VIN = 0 V to VCC VI/O = 0 V to VCC, /OE = VIH or /CS = VIH or /WE = VIL
-1.0 -1.0
A A
Operating supply current
ICCA1
/CS = VIL, Minimum cycle time, II/O = 0 mA
PD43256B-A85X PD43256B-A10X PD43256B-A12X PD43256B-B10X PD43256B-B12X PD43256B-B15X
VCC 3.3 V
45 40 40 - - - - 15
- - - 40 40 40 25 15 10 15 10 3 2 1.0 50 25 2.4 2.4 VCC- 0.1
mA
ICCA2
/CS = VIL, II/O = 0 mA VCC 3.3 V
- 15 - 3
ICCA3
/CS 0.2 V, Cycle = 1 MHz, II/O = 0 mA, VIL 0.2 V, VIH VCC - 0.2 V VCC 3.3 V
Standby supply current
ISB
/CS = VIH VCC 3.3 V
mA
- 1.0 50 - 2.4 2.4 VCC- 0.1
ISB1
/CS VCC - 0.2 V VCC 3.3 V
A
High level output voltage
VOH1
IOH = -1.0 mA, VCC 4.5 V IOH = -0.5 mA, VCC < 4.5 V
V
VOH2
IOH = -0.02 mA IOL = 2.1 mA, VCC 4.5 V IOL = 1.0 mA, VCC < 4.5 V
Low level output voltage
VOL
0.4 0.4 0.1
0.4 0.4 0.1
V
VOL1
IOL = 0.02 mA
Remarks 1. VIN : Input voltage VI/O : Input / Output voltage 2. These DC characteristics are in common regardless of package types.
Data Sheet M11012EJ6V0DS
7
PD43256B-X
AC Characteristics (Recommended Operating Conditions Unless Otherwise Noted) AC Test Conditions [PD43256B-70X, PD43256B-85X] Input Waveform (Rise and Fall Time 5 ns)
2.4 V 1.5 V 0.6 V Test points 1.5 V
Output Waveform
1.5 V
Test points
1.5 V
Output Load AC characteristics should be measured with the following output load conditions. Figure 1 (tAA, tACS, tOE, tOH)
+5 V
Figure 2 (tCHZ, tCLZ, tOHZ, tOLZ, tWHZ, tOW)
+5 V
1.8 k I/O (Output) 990 100 pF CL I/O (Output) 990
1.8 k
5 pF CL
Remark CL includes capacitance of the probe and jig, and stray capacitance. [PD43256B-A85X, PD43256B-A10X, PD43256B-A12X, PD43256B-B10X, PD43256B-B12X, PD43256B-B15X] Input Waveform (Rise and Fall Time 5 ns)
2.4 V 1.5 V 0.4 V Test points 1.5 V
Output Waveform
1.5 V
Test points
1.5 V
Output Load AC characteristics should be measured with the following output load conditions.
tAA, tACS, tOE, tOH 1TTL + 50 pF tCHZ, tCLZ, tOHZ, tOLZ, tWHZ, tOW 1TTL + 5 pF
8
Data Sheet M11012EJ6V0DS
PD43256B-X
Read Cycle (1/2)
Parameter Symbol VCC 4.5 V Unit Condition
PD43256B-70X
MIN. Read cycle time Address access time /CS access time /OE access time Output hold from address change /CS to output in low impedance /OE to output in low impedance /CS to output in high impedance /OE to output in high impedance tRC tAA tACS tOE tOH tCLZ tOLZ tCHZ tOHZ 10 10 5 30 30 70 70 70 35 MAX.
PD43256B-85X
MIN. 85 85 85 40 10 10 5 30 30 MAX.
PD43256B-AxxX PD43256B-BxxX
MIN. 100 100 100 50 10 10 5 35 35 MAX. ns ns ns ns ns ns ns ns ns
Note
Note
See the output load.
Remark These AC characteristics are in common regardless of package types and L, LL versions. Read Cycle (2/2)
Parameter
Symbol
VCC 3.0 V
VCC 2.7 V
Unit Con-
PD43256B- PD43256B- PD43256B- PD43256B- PD43256B- PD43256BA85X MIN. Read cycle time Address access time /CS access time /OE access time Output hold from address change /CS to output in low impedance /OE to output in low impedance /CS to output in high impedance /OE to output in high impedance tOHZ 35 35 40 35 40 50 ns tCHZ 35 35 40 35 40 50 ns tOLZ 5 5 5 5 5 5 ns tCLZ 10 10 10 10 10 10 ns tACS tOE tOH 10 85 50 10 100 60 10 120 60 10 100 60 10 120 60 10 150 70 ns ns ns tRC tAA 85 85 MAX. A10X MIN. 100 100 MAX. A12X MIN. 120 120 MAX. B10X MIN. 100 100 MAX. B12X MIN. 120 120 MAX. B15X MIN. 150 150 MAX. ns ns
dition
Note
Note
See the output load.
Remark These AC characteristics are in common regardless of package types.
Data Sheet M11012EJ6V0DS
9
PD43256B-X
Read Cycle Timing Chart
tRC
Address (Input) tAA /CS (Input) tACS tCLZ tCHZ tOH
/OE (Input) tOE tOLZ I/O (Output) High impedance Data out tOHZ
Remark
In read cycle, /WE should be fixed to high level.
10
Data Sheet M11012EJ6V0DS
PD43256B-X
Write Cycle (1/2)
Parameter Symbol VCC 4.5 V Unit Condition
PD43256B-70X
PD43256B-85X
PD43256B-AxxX PD43256B-BxxX
MIN. Write cycle time /CS to end of write Address valid to end of write Write pulse width Data valid to end of write Data hold time Address setup time Write recovery time /WE to output in high impedance Output active from end of write tWC tCW tAW tWP tDW tDH tAS tWR tWHZ tOW 5 70 60 60 55 30 5 0 0
MAX.
MIN. 85 70 70 60 35 5 0 0
MAX.
MIN. 100 80 80 70 40 5 0 0
MAX. ns ns ns ns ns ns ns ns 35 ns ns Note
30 5
30 5
Note
See the output load.
Remark These AC characteristics are in common regardless of package types and L, LL versions. Write Cycle (2/2)
Parameter
Symbol
VCC 3.0 V
VCC 2.7 V
Unit Con-
PD43256B- PD43256B- PD43256B- PD43256B- PD43256B- PD43256BA85X MIN. Write cycle time /CS to end of write Address valid to end of write Write pulse width Data valid to end of write Data hold time Address setup time Write recovery time /WE to output in high impedance Output active from end of write tOW 5 5 5 5 5 5 ns tDH tAS tWR tWHZ 5 0 0 35 5 0 0 35 5 0 0 40 5 0 0 35 5 0 0 40 5 0 0 40 ns ns ns ns tWP tDW 60 60 60 60 80 70 60 60 80 70 90 80 ns ns tWC tCW tAW 85 70 70 MAX. A10X MIN. 100 70 70 MAX. A12X MIN. 120 90 90 MAX. B10X MIN. 100 70 70 MAX. B12X MIN. 120 90 90 MAX. B15X MIN. 150 100 100 MAX. ns ns ns
dition
Note
Note
See the output load.
Remark These AC characteristics are in common regardless of package types.
Data Sheet M11012EJ6V0DS
11
PD43256B-X
Write Cycle Timing Chart 1 (/WE Controlled)
tWC Address (Input) tCW /CS (Input) tAW tAS /WE (Input) tOW tWHZ I/O (Input / Output) Indefinite data out High impedance tDW Data in tDH High impedance Indefinite data out tWP tWR
Cautions 1. /CS or /WE should be fixed to high level during address transition. 2. When I/O pins are in the output state, do not apply to the I/O pins signals that are opposite in phase with output signals.
Remarks 1. Write operation is done during the overlap time of a low level /CS and a low level /WE. 2. When /WE is at low level, the I/O pins are always high impedance. When /WE is at high level, read operation is executed. Therefore /OE should be at high level to make the I/O pins high impedance. 3. If /CS changes to low level at the same time or after the change of /WE to low level, the I/O pins will remain high impedance state.
12
Data Sheet M11012EJ6V0DS
PD43256B-X
Write Cycle Timing Chart 2 (/CS Controlled)
tWC Address (Input)
tAS /CS (Input) tAW tWP /WE (Input)
tCW
tWR
tDW High impedance I/O (Input) Data in
tDH High impedance
Cautions 1. /CS or /WE should be fixed to high level during address transition. 2. When I/O pins are in the output state, do not apply to the I/O pins signals that are opposite in phase with output signals.
Remark
Write operation is done during the overlap time of a low level /CS and a low level /WE.
Data Sheet M11012EJ6V0DS
13
PD43256B-X
Low VCC Data Retention Characteristics (TA = -25 to +85 C)
Parameter Data retention supply voltage Data retention supply current Chip deselection to data retention mode Operation recovery time Symbol VCCDR ICCDR tCDR tR Test Condition /CS VCC - 0.2 V VCC = 3.0 V, /CS VCC - 0.2 V 0 5 MIN. 2.0 0.5 TYP. MAX. 5.5 20
Note
Unit V
A
ns ms
Note 2 A (TA 40 C), 7 A (TA 70 C)
Data Retention Timing Chart
tCDR VCC 4.5 V
Note
Data retention mode
tR
/CS VIH (MIN.) VCCDR (MIN.) /CS VCC - 0.2 V
VIL (MAX.)
GND
Note A version : 3.0 V, B version : 2.7 V
Remark
The other pins (Address, /OE, /WE, I/O) can be in high impedance state.
14
Data Sheet M11012EJ6V0DS
PD43256B-X
Package Drawings
28-PIN PLASTIC TSOP(I) (8x13.4)
1
28 detail of lead end S
R 14 15 Q
P I J S A G
H L K N S D
C M
M
B
NOTES
1. Each lead centerline is located within 0.08 mm of its true position (T.P.) at maximum material condition. 2. "A" excludes mold flash. (Includes mold flash : 8.4mm MAX.)
ITEM A B C D G H I J K L M N P Q R S
MILLIMETERS 8.00.1 0.6 MAX. 0.55 (T.P.) 0.22 +0.08 -0.07 1.0 12.40.2 11.80.1 0.80.2 0.145 +0.025 -0.015 0.50.1 0.08 0.10 13.40.2 0.10.05 3 +7 -3 1.2 MAX. P28GW-55-9JL-2
Data Sheet M11012EJ6V0DS
15
PD43256B-X
28-PIN PLASTIC TSOP(I) (8x13.4)
1
28
detail of lead end Q R
14
15 S
K H
N
S L
D
M C
M
B
S G I P J A
NOTE 1. Each lead centerline is located within 0.08 mm of its true position (T.P.) at maximum material condition.
2. "A" excludes mold flash. (Includes mold flash : 8.4mm MAX.)
ITEM A B C D G H I J K L M N P Q R S
MILLIMETERS 8.00.1 0.6 MAX. 0.55 (T.P.) 0.22 +0.08 -0.07 1.0 12.40.2 11.80.1 0.80.2 0.145 +0.025 -0.015 0.50.1 0.08 0.10 13.40.2 0.10.05 3 +7 -3 1.2 MAX. P28GW-55-9KL-2
16
Data Sheet M11012EJ6V0DS
PD43256B-X
Recommended Soldering Conditions
Please consult with our sales offices for soldering conditions of the PD43256B-X.
Types of Surface Mount Device
PD43256BGW-xxX-9JL PD43256BGW-xxX-9KL PD43256BGW-AxxX-9JL PD43256BGW-AxxX-9KL PD43256BGW-BxxX-9JL PD43256BGW-BxxX-9KL PD43256BGW-xxX-9JL-A PD43256BGW-xxX-9KL-A PD43256BGW-AxxX-9JL-A PD43256BGW-AxxX-9KL-A PD43256BGW-BxxX-9JL-A PD43256BGW-BxxX-9KL-A
: 28-pin PLASTIC TSOP(I) (8x13.4) (Normal bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Reverse bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Normal bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Reverse bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Normal bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Reverse bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Normal bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Reverse bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Normal bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Reverse bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Normal bent) : 28-pin PLASTIC TSOP(I) (8x13.4) (Reverse bent)
Data Sheet M11012EJ6V0DS
17
PD43256B-X
Revision History
Edition/ Date This edition 6th edition/ Jun. 2006 p.1 Page Previous edition p.1 Deletion - Description of Version X has been deleted. Type of revision Location Description (Previous edition This edition)
18
Data Sheet M11012EJ6V0DS
PD43256B-X
NOTES FOR CMOS DEVICES
1 VOLTAGE APPLICATION WAVEFORM AT INPUT PIN Waveform distortion due to input noise or a reflected wave may cause malfunction. If the input of the CMOS device stays in the area between VIL (MAX) and VIH (MIN) due to noise, etc., the device may malfunction. Take care to prevent chattering noise from entering the device when the input level is fixed, and also in the transition period when the input level passes through the area between VIL (MAX) and VIH (MIN). 2 HANDLING OF UNUSED INPUT PINS Unconnected CMOS device inputs can be cause of malfunction. If an input pin is unconnected, it is possible that an internal input level may be generated due to noise, etc., causing malfunction. CMOS devices behave differently than Bipolar or NMOS devices. Input levels of CMOS devices must be fixed high or low by using pull-up or pull-down circuitry. Each unused pin should be connected to VDD or GND via a resistor if there is a possibility that it will be an output pin. All handling related to unused pins must be judged separately for each device and according to related specifications governing the device. 3 PRECAUTION AGAINST ESD A strong electric field, when exposed to a MOS device, can cause destruction of the gate oxide and ultimately degrade the device operation. Steps must be taken to stop generation of static electricity as much as possible, and quickly dissipate it when it has occurred. Environmental control must be adequate. When it is dry, a humidifier should be used. It is recommended to avoid using insulators that easily build up static electricity. Semiconductor devices must be stored and transported in an anti-static container, static shielding bag or conductive material. All test and measurement tools including work benches and floors should be grounded. The operator should be grounded using a wrist strap. Semiconductor devices must not be touched with bare hands. Similar precautions need to be taken for PW boards with mounted semiconductor devices. 4 STATUS BEFORE INITIALIZATION Power-on does not necessarily define the initial status of a MOS device. Immediately after the power source is turned ON, devices with reset functions have not yet been initialized. Hence, power-on does not guarantee output pin levels, I/O settings or contents of registers. A device is not initialized until the reset signal is received. A reset operation must be executed immediately after power-on for devices with reset functions. 5 POWER ON/OFF SEQUENCE In the case of a device that uses different power supplies for the internal operation and external interface, as a rule, switch on the external power supply after switching on the internal power supply. When switching the power supply off, as a rule, switch off the external power supply and then the internal power supply. Use of the reverse power on/off sequences may result in the application of an overvoltage to the internal elements of the device, causing malfunction and degradation of internal elements due to the passage of an abnormal current. The correct power on/off sequence must be judged separately for each device and according to related specifications governing the device. 6 INPUT OF SIGNAL DURING POWER OFF STATE Do not input signals or an I/O pull-up power supply while the device is not powered. The current injection that results from input of such a signal or I/O pull-up power supply may cause malfunction and the abnormal current that passes in the device at this time may cause degradation of internal elements. Input of signals during the power off state must be judged separately for each device and according to related specifications governing the device.
Data Sheet M11012EJ6V0DS
19
PD43256B-X
* The information in this document is current as of June, 2006. The information is subject to change without notice. For actual design-in, refer to the latest publications of NEC Electronics data sheets or data books, etc., for the most up-to-date specifications of NEC Electronics products. Not all products and/or types are available in every country. Please check with an NEC Electronics sales representative for availability and additional information. * No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Electronics. NEC Electronics assumes no responsibility for any errors that may appear in this document. * NEC Electronics does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from the use of NEC Electronics products listed in this document or any other liability arising from the use of such products. No license, express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC Electronics or others. * Descriptions of circuits, software and other related information in this document are provided for illustrative purposes in semiconductor product operation and application examples. The incorporation of these circuits, software and information in the design of a customer's equipment shall be done under the full responsibility of the customer. NEC Electronics assumes no responsibility for any losses incurred by customers or third parties arising from the use of these circuits, software and information. * While NEC Electronics endeavors to enhance the quality, reliability and safety of NEC Electronics products, customers agree and acknowledge that the possibility of defects thereof cannot be eliminated entirely. To minimize risks of damage to property or injury (including death) to persons arising from defects in NEC Electronics products, customers must incorporate sufficient safety measures in their design, such as redundancy, fire-containment and anti-failure features. * NEC Electronics products are classified into the following three quality grades: "Standard", "Special" and "Specific". The "Specific" quality grade applies only to NEC Electronics products developed based on a customerdesignated "quality assurance program" for a specific application. The recommended applications of an NEC Electronics product depend on its quality grade, as indicated below. Customers must check the quality grade of each NEC Electronics product before using it in a particular application. "Standard": Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots. "Special": Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support). "Specific": Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems and medical equipment for life support, etc. The quality grade of NEC Electronics products is "Standard" unless otherwise expressly specified in NEC Electronics data sheets or data books, etc. If customers wish to use NEC Electronics products in applications not intended by NEC Electronics, they must contact an NEC Electronics sales representative in advance to determine NEC Electronics' willingness to support a given application. (Note) (1) "NEC Electronics" as used in this statement means NEC Electronics Corporation and also includes its majority-owned subsidiaries. (2) "NEC Electronics products" means any product developed or manufactured by or for NEC Electronics (as defined above).
M8E 02. 11-1

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