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Data Sheet PT74HC138 3-to-8 Line Decoder
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Features
* Typical propagation delay: 20nS * Wide power supply range: 2 - 6V * Low quiescent current: 80A maximum * Low input current: 1A maximum * Fan out of 10 LS-TTL loads
Description
The PT74HC138 decoder utilizes advanced silicongate CMOS technology and is well suited to memory address decoding or data routing applications. The circuit features high noise immunity and low power consumption usually associated with CMOS circuitry, yet has speeds comparable to low power Schottky TTL logic. The PT74HC138 has 3 binary select inputs (A, B and C). If the device is enabled, these inputs determine which one of the eight normally HIGH outputs will go LOW. Two active LOW and one active HIGH enables (G1, G2A and G2B) are provided to ease the cascading of decoders.
Ordering Information
Ordering No. PT74HC138W PT74HC138WE PT74HC138P PT74HC138PE SOIC-16 Lead free SOIC-16 PDIP-16 Lead free PDIP-16 Package The decoder's outputs can drive 10 low power Schottky TTL equivalent loads and are functionally pin equivalent to the 74LS138. All inputs are protected from damage due to static discharge by internal diode clamps to VCC and ground.
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Data Sheet PT74HC138 3-to-8 Line Decoder
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Pin Information
Data Output V cc 16
Y0 Y1 Y2 Y3 V4 V5 V0 V1 V2 V3 Y4 Y5
15 14 13 12 11 10
Y6 V6
9
1 A
2 B Select
3
4
5
6
7
8
C G2A G2B G1 V7 GND Y7 Enable Output
Truth table
Inputs Select G1 C B A G2(Note) X H X X X L X X X X H L L L L H L L L H H L L H L H L L H H H L H L L H L H L H H L H H L H L H H H H=HIGH Level, L=LOW Level, X=Don't care. Note: G2=G2A+G2B Enable Y0 H H L H H H H H H H Y1 H H H L H H H H H H Y2 H H H H L H H H H H Outputs Y3 H H H H H L H H H H Y4 H H H H H H L H H H Y5 H H H H H H H L H H Y6 H H H H H H H H L H Y7 H H H H H H H H H L
Logic Diagram
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Data Sheet PT74HC138 3-to-8 Line Decoder
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Maximum Ratings
Note: Stresses greater than those listed under MAXIMUM Storage Temperature..........................................................................................-65oC to +150oC RATINGS may cause permanent damage to the oC to +85oC Ambient Temperature with Power Applied................................................-40 device. This is a stress rating only and functional Supply Voltage to Ground Potential (VCC to GND).......................................-0.5V to 7.0V operation of the device at these or any other condiDC Input Voltage (VIN).................................................................................-1.5V to VCC+1.5V tions above those indicated in the operational secDC Output Voltage (VOUT) ...................................... -0.5V to VCC +0.5V tions of this specification is not implied. Exposure Clamp Diode Current (IIK, IOK) ....................................................20mA to absolute maximum rating conditions for extended DC Output Current, per pin (IOUT)...............................................25mA periods may affect reliability. DC VCC or GND Current, per pin (ICC)........................................50mA Power Dissipation (PD) * ..................................................................................................600mW S. O. Package only ......................................................................500mV * Power Dissipation temperature derating - plastic PDIP package: -12mW/oC from 65oC to 85oC.
Recommended operation conditions
Sym Vcc VIN, VOUT TA Tr , T f Description Supply voltage DC input or output voltage Operating temperature Input rise or fall time Test Conditions Vcc=2.0V Vcc=4.5V Vcc=6.0V Min 2.0 0.0 -40 Typ Max 6.0 Vcc 85 1000 500 400 Unit V V nS
DC Electrical Characteristics
Sym VIH VIL Parameter Minimum High Level Input Voltage Maximum LOW Level Input Voltage Minimum High Level Output Voltage Test Conditions VIN =VIH or VIL |I OUT | 20 A VIN =VIH or VIL |I OUT | 4.0 mA |I OUT | 5.2 mA VIN=VIH |I OUT | 20 A VIN =VIH |I OUT | 4.0 mA |I OUT | 5.2 mA VIN =VCC or GND VIN =VCC or GND IOUT = 0 A VCC 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 4.5V 6.0V 2.0V 4.5V 6.0V 4.5V 6.0V 6.0V 6.0V TA=25 Typ 2.0 4.5 6.0 4.2 5.7 0 0 0 0.2 0.2 TA= -40 to 85 Guaranteed Limits 1.5 1.5 3.15 3.15 4.2 4.2 0.5 0.5 1.35 1.35 1.8 1.8 1.9 1.9 4.4 4.4 5.9 5.9 3.98 5.48 0.1 0.1 0.1 0.26 0.26 0.1 8 3.84 5.34 0.1 0.1 0.1 0.33 0.33 0.1 80 Unit V V V V V V A A
VOH
VOL
Maximum LOW Level Output Voltage Maximum Input Current Maximum Quiescent Supply Current
IIN ICC
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Data Sheet PT74HC138 3-to-8 Line Decoder
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AC Electrical Characteristics
VCC= 5V, TA= 250C, CL=15pF, tr=tf= 6nS, Unless otherwise noted. Symbol tPLH tPHL tPLH, tPHL tPHL tPLH Parameter Maximum Propagation Delay, Binary select to any output Maximum Propagation Delay, Binary select to any output Maximum Propagation Delay, G1 to any output Maximum propagation Dealay G2A or G2B to output Maximum propagation Dealay G2A or G2B to output Conditions Typ 18 28 18 23 18 Guaranteed Limit 25 35 25 30 25 Units nS nS nS nS nS
VCC=2.0V to 6.0V, CL=50pF, tr=tf=6nS, Unless otherwise noted. TA=250C Sym Parameter Maximum propagation Delay Binary Select to any output LOW-toHIGH Maximum Propagation Delay Binary Select to any output HIGH-toLOW Maximum Propagation Delay G1 to any output Maximum Propagation Delay G2A or G2B to output Maximum Propagation Delay G2A or G2B to output Output Rise and Fall Time Power Dissipation Capacitance (Note ) Maximum Input Capacitance Conditions VCC Typ tPLH 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 75 15 13 100 20 17 75 15 13 82 28 22 75 15 13 30 8 7 75 150 30 26 200 40 34 150 30 26 175 35 30 150 30 26 75 15 13 GuaranteedLimits 189 38 32 252 50 43 189 38 32 221 44 37 189 38 32 95 19 16 nS TA= -40 to 850C Units
tPHL tPHL, tPLH tPHL tPLH tTLH , tTHL CPD
-
nS
-
nS nS
-
nS nS pF
CIN
-
-
3
10
10
pF
Note: CPD determines the no load dynamic power consumption, PD=CPDVCC2f + ICCVCC, and the no load dynamic current consumption. IS= CPDVCCf + ICC.
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Data Sheet PT74HC138 3-to-8 Line Decoder
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Mechanical Information
P/PE (PDIP-16)
16
.240 .280
6.09 7.11
1
.780 .800 19.82 20.32 .210 Max 5.33 SEATING PLANE
7.62 8.25 .300 .325
.008 .014 0.20 0.35 .430 Max 10.92
.015 .115 .150 2.921 3.81
0.381
Min
.100 typical 2.54
.014 .022
.356 .558
X.XX X.XX
Note:
DENOTES DIMENSIONS IN MILLIMETERS
1) Controlling dimensions in inches. 2) Ref: JDDEC MS-001 AB
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Data Sheet PT74HC138 3-to-8 Line Decoder
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W/WE (SOIC-16)
16
.149 .157
3.78 3.99 .0099 .0196 0.25 0.50
o
45
.386 .393 9.80 10.00
0-8
o
.0075 .0098 0.41 1.27 .2284 .2440 5.80 6.20 .016 .050
0.19 0.25
.0155 .026 0.393 0.660 REF
.053 .068
1.35 1.75 SEATING PLANE
.050 BSC 1.27
.013 .020 0.330 0.508
.0040 .0098
0.10 0.25
X.XX X.XX
DENOTES DIMENSIONS IN MILLIMETERS
Notes 1) Controlling dimensions in millimeters. 2) Ref: JDDEC MS-012 AC
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Data Sheet PT74HC138 3-to-8 Line Decoder
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Notes
Pericom Technology Inc.
Email: support@pti.com.cn China: Web Site: www.pti.com.cn, www.pti-ic.com
No. 20 Building, 3/F, 481 Guiping Road, Shanghai, 200233, China Tel: (86)-21-6485 0576 Fax: (86)-21-6485 2181 Unit 1517, 15/F, Chevalier Commercial Centre, 8 Wang Hoi Rd, Kowloon Bay, Hongkong Tel: (852)-2243 3660 Fax: (852)- 2243 3667 3545 North First Street, San Jose, California 95134, USA Tel: (1)-408-435 0800 Fax: (1)-408-435 1100
Asia Pacific:
U.S.A.:
Pericom Technology Incorporation reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom Technology does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom Technology product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom Technology Incorporation.
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