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MC74AC256 MC74ACT256 Dual 4 Bit Addressable Latch
The MC74AC256/74ACT256 dual addressable latch has four distinct modes of operation which are selectable by controlling the Clear and Enable inputs (see Function Table). In the addressable latch mode, data at the Data (D) inputs is written into the addressed latches. The addressed latches will follow the Data input with all unaddressed latches remaining in their previous states. In the memory mode, all latches remain in their previous states and are unaffected by the Data or Address inputs. To eliminate the possibility of entering erroneous data in the latches, the enable should be held HIGH (inactive) while the address lines are changing. In the dual 1-of-4 decoding or demultiplexing mode (MR = E = LOW), addressed outputs will follow the level of the D inputs with all other outputs LOW. In the clear mode, all outputs are LOW and unaffected by the Address and Data inputs. * * * * * * * Combines Dual Demultiplexer and 8-Bit Latch Serial-to-Parallel Capability Output from Each Storage Bit Available Random (Addressable) Data Entry Easily Expandable Common Clear Input Useful as Dual 1-of-4 Active HIGH Decoder
VCC 16 MR 15 E 14 Db 13 Q3b 12 Q2b 11 Q1b 10 Q0b 9
DUAL 4-BIT ADDRESSABLE LATCH
N SUFFIX CASE 648-08 PLASTIC
D SUFFIX CASE 751B-05 PLASTIC
1 A0
2 A1
3 Da
4 Q0a
5 Q1a
6 Q2a
7 Q3a
8 GND
LOGIC SYMBOL
Db Da A0 E MR A1 Q0a Q1a Q2a Q3a Q0b Q1b Q2b Q3b
FACT DATA 5-1
MC74AC256 MC74ACT256
MODE SELECT-FUNCTION TABLE
Operating Mode Master Reset Demultiplex (Active HIGH Decoder when D = H) Store (Do Nothing) Addressable Latch Inputs MR L L L L L H H H H H E H L L L L H L L L L D X d d d d X d d d d A0 X L H L H X L H L H A1 X L L H H X L L H H Q0 L Q=d L L L q0 Q=d q0 q0 q0 Outputs Q1 L L Q=d L L q1 q1 Q=d q1 q1 Q2 L L L Q=d L q2 q2 q2 Q=d q2 Q3 L L L L Q=d q3 q3 q3 q3 Q=d
H = HIGH Voltage Level Steady State L = LOW Voltage Level Steady State X = Immaterial d = HIGH or LOW Data one setup time prior to the LOW-to-HIGH Enable transition q = Lower case letters indicate the state of the referenced output established during the last cycle in which it was addressed or cleared.
LOGIC DIAGRAM
E Da A0 A1 MR Db
Q0a
Q1a
Q2a
Q3a
Q0b
Q1b
Q2b
Q3b
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
MAXIMUM RATINGS*
Symbol VCC Vin Vout Iin Iout ICC Tstg Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Sink/Source Current, per Pin DC VCC or GND Current per Output Pin Storage Temperature Value -0.5 to +7.0 -0.5 to VCC +0.5 -0.5 to VCC +0.5 20 50 50 -65 to +150 Unit V V V mA mA mA C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.
FACT DATA 5-2
MC74AC256 MC74ACT256
RECOMMENDED OPERATING CONDITIONS
Symbol VCC Vin, Vout Supply Voltage DC Input Voltage, Output Voltage (Ref. to GND) VCC @ 3.0 V tr, tf Input Rise and Fall Time (Note 1) AC Devices except Schmitt Inputs VCC @ 4.5 V VCC @ 5.5 V tr, tf TJ TA IOH IOL Input Rise and Fall Time (Note 2) ACT Devices except Schmitt Inputs Junction Temperature (PDIP) Operating Ambient Temperature Range Output Current -- High Output Current -- Low -40 25 VCC @ 4.5 V VCC @ 5.5 V Parameter AC ACT Min 2.0 4.5 0 150 40 25 10 ns/V 8.0 140 85 -24 24 C C mA mA ns/V Typ 5.0 5.0 Max 6.0 5.5 VCC V Unit V
1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times. 2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.
DC CHARACTERISTICS
74AC Symbol Parameter VCC (V) TA = +25C Typ VIH Minimum High Level Input Voltage Maximum Low Level Input Voltage Minimum High Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 VOL Maximum Low Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 IIN IOLD IOHD ICC Maximum Input Leakage Current Minimum Dynamic Output Current Maximum Quiescent Supply Current 5.5 5.5 5.5 5.5 8.0 0.002 0.001 0.001 1.5 2.25 2.75 1.5 2.25 2.75 2.99 4.49 5.49 74AC TA = -40C to +85C Unit Conditions
Guaranteed Limits 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 2.56 3.86 4.86 0.1 0.1 0.1 0.36 0.36 0.36 0.1 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 2.46 3.76 4.76 0.1 0.1 0.1 0.44 0.44 0.44 1.0 75 -75 80 V VOUT = 0.1 V or VCC - 0.1 V VOUT = 0.1 V or VCC - 0.1 V IOUT = -50 A V *VIN = VIL or VIH -12 mA IOH -24 mA -24 mA IOUT = 50 A V *VIN = VIL or VIH 12 mA IOL 24 mA 24 mA VI = VCC, GND VOLD = 1.65 V Max VOHD = 3.85 V Min VIN = VCC or GND
VIL
V
VOH
V
V
A mA mA A
* All outputs loaded; thresholds on input associated with output under test. Maximum test duration 2.0 ms, one output loaded at a time. Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.
FACT DATA 5-3
MC74AC256 MC74ACT256
AC CHARACTERISTICS (For Figures and Waveforms -- See Section 3)
74AC Symbol Parameter VCC* (V) Min tPLH tPHL tPLH tPHL tPLH tPHL tPHL Propagation Delay Dn to Qn Propagation Delay Dn to Qn Propagation Delay E to Qn Propagation Delay E to Qn Propagation Delay Address to Qn Propagation Delay Address to Qn Propagation Delay MR to Q 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 TA = +25C CL = 50 pF Typ 9.0 6.5 9.0 6.0 10.5 7.0 8.0 7.5 12.0 8.0 10.0 7.0 8.0 6.0 Max 14.5 10.0 13.5 9.5 15.0 10.5 12.5 9.0 19.0 13.0 16.0 11.0 12.0 9.0 74AC TA = -40C to +85C CL = 50 pF Min 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Max 17.0 11.5 16.0 11.0 17.5 12.5 15.0 11.0 22.5 15.5 19.0 13.0 13.5 10.0 ns ns ns ns ns ns ns 3-5 3-5 3-6 3-6 3-6 3-6 3-7 Unit Fig. No.
* Voltage Range 3.3 V is 3.3 V 0.3 V. Voltage Range 5.0 V is 5.0 V 0.5 V.
AC OPERATING REQUIREMENTS
74AC Symbol Parameter VCC* (V) Typ ts th ts th Setup Time, HIGH or LOW Dn to E Hold Time, HIGH or LOW Dn to E Setup Time Address to E Hold Time Address to E 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 TA = +25C CL = 50 pF 74AC TA = -40C to +85C CL = 50 pF Unit Fig. No.
Guaranteed Minimum 3.5 2.5 2.5 2.0 7.0 4.0 2.0 2.0 4.5 3.5 2.5 2.0 9.0 6.0 2.0 2.0 ns ns ns ns 3-9 3-9 3-6 3-6
* Voltage Range 3.3 V is 3.3 V 0.3 V. Voltage Range 5.0 V is 5.0 V 0.5 V.
FACT DATA 5-4
MC74AC256 MC74ACT256
DC CHARACTERISTICS
74ACT Symbol Parameter VCC (V) TA = +25C Typ VIH VIL VOH Minimum High Level Input Voltage Maximum Low Level Input Voltage Minimum High Level Output Voltage 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 VOL Maximum Low Level Output Voltage 4.5 5.5 4.5 5.5 IIN ICCT IOLD IOHD ICC Maximum Input Leakage Current Additional Max. ICC/Input Minimum Dynamic Output Current Maximum Quiescent Supply Current 5.5 5.5 5.5 5.5 5.5 8.0 0.6 0.001 0.001 1.5 1.5 1.5 1.5 4.49 5.49 74ACT TA = -40C to +85C Unit Conditions
Guaranteed Limits 2.0 2.0 0.8 0.8 4.4 5.4 3.86 4.86 0.1 0.1 0.36 0.36 0.1 2.0 2.0 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.44 0.44 1.0 1.5 75 -75 80 V V V VOUT = 0.1 V or VCC - 0.1 V VOUT = 0.1 V or VCC - 0.1 V IOUT = -50 A *VIN = VIL or VIH -24 mA IOH -24 mA IOUT = 50 A *VIN = VIL or VIH 24 mA IOL 24 mA VI = VCC, GND VI = VCC - 2.1 V VOLD = 1.65 V Max VOHD = 3.85 V Min VIN = VCC or GND
V
V
V
A mA mA mA A
* All outputs loaded; thresholds on input associated with output under test. Maximum test duration 2.0 ms, one output loaded at a time.
FACT DATA 5-5
MC74AC256 MC74ACT256
AC CHARACTERISTICS (For Figures and Waveforms -- See Section 3)
74ACT Symbol Parameter VCC* (V) Min tPLH tPHL tPLH tPHL tPLH tPHL tPHL Propagation Delay Dn to Qn Propagation Delay Dn to Qn Propagation Delay E to Qn Propagation Delay E to Qn Propagation Delay Address to Qn Propagation Delay Address to Qn Propagation Delay MR to Q 5.0 5.0 5.0 5.0 5.0 5.0 5.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 TA = +25C CL = 50 pF Typ 6.5 7.0 8.0 6.5 10.5 9.0 7.0 Max 11.5 11.0 12.0 10.5 14.5 12.5 10.5 74ACT TA = -40C to +85C CL = 50 pF Min 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Max 13.0 12.5 14.0 12.5 17.0 14.5 11.5 ns ns ns ns ns ns ns 3-5 3-5 3-6 3-6 3-6 3-6 3-7 Unit Fig. No.
* Voltage Range 5.0 V is 5.0 V 0.5 V.
AC OPERATING REQUIREMENTS
74ACT Symbol Parameter VCC* (V) Typ ts th ts th Setup Time, HIGH or LOW Dn to E Hold Time, HIGH or LOW Dn to E Setup Time Address to E Hold Time Address to E 5.0 5.0 5.0 5.0 TA = +25C CL = 50 pF 74ACT TA = -40C to +85C CL = 50 pF Unit Fig. No.
Guaranteed Minimum 3.5 2.5 5.5 2.5 4.5 2.5 6.5 2.5 ns ns ns ns 3-9 3-9 3-6 3-6
* Voltage Range 5.0 V is 5.0 V 0.5 V.
CAPACITANCE
Symbol CIN CPD Input Capacitance Power Dissipation Capacitance Parameter Value Typ 4.5 30.0 Unit pF pF Test Conditions VCC = 5.0 V VCC = 5.0 V
FACT DATA 5-6
MC74AC256 MC74ACT256
OUTLINE DIMENSIONS
N SUFFIX PLASTIC DIP PACKAGE CASE 738-03 ISSUE E
11
-A-
20
B
1 10
C
L
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. INCHES MIN MAX 1.010 1.070 0.240 0.260 0.150 0.180 0.015 0.022 0.050 BSC 0.050 0.070 0.100 BSC 0.008 0.015 0.110 0.140 0.300 BSC 0_ 15 _ 0.020 0.040 MILLIMETERS MIN MAX 25.66 27.17 6.10 6.60 3.81 4.57 0.39 0.55 1.27 BSC 1.27 1.77 2.54 BSC 0.21 0.38 2.80 3.55 7.62 BSC 0_ 15_ 0.51 1.01
-T-
SEATING PLANE
K M E G F D
20 PL
N J 0.25 (0.010)
M 20 PL
0.25 (0.010) TA
M
M
TB
M
DIM A B C D E F G J K L M N
-A-
20 11
DW SUFFIX PLASTIC SOIC PACKAGE CASE 751D-04 ISSUE E
-B-
1 10
10X
P 0.010 (0.25)
M
B
M
20X
D
M
J TA
S
0.010 (0.25)
B
S
F R X 45 _ C -T-
18X SEATING PLANE
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.150 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS INCHES DIM MIN MAX MIN MAX A 12.65 12.95 0.499 0.510 B 7.40 7.60 0.292 0.299 C 2.35 2.65 0.093 0.104 D 0.35 0.49 0.014 0.019 F 0.50 0.90 0.020 0.035 G 1.27 BSC 0.050 BSC J 0.25 0.32 0.010 0.012 K 0.10 0.25 0.004 0.009 M 0_ 7_ 0_ 7_ P 10.05 10.55 0.395 0.415 R 0.25 0.75 0.010 0.029
G
K
M
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JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, Toshikatsu Otsuki, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-3521-8315 HONG KONG: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298
FACT DATA 5-7
*MC74AC256/D*
MC74AC256/D

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