Datasheet

ManualsBrandsUnbranded ManualsLogic ICsLogic IC - Demultiplexer, decoder SMD 74 HCT 138 Decoder/demultiplexer Single supply SOIC 16

M54HCT138

M74HCT138

February 1993

3 TO 8 LINE DECODER (INVERTING)

B1R

(Plastic Package)

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTIONS (top view)

NC =

No Internal

Connection

INPUT AND OUTPUT EQUIVALENT CIRCUIT

ORDER CODES :

M54HCT138F1R M74HCT138M1R

M74HCT138B1R M74HCT138C1R

DESCRIPTION

.HIGH SPEED

= 16 ns (TYP.) at V

=5V

.LOW POWER DISSIPATION

=4µAATT

=25°C

.OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

.BALANCEDPROPAGATION DELAYS

PLH

PHL

.SYMMETRICAL OUTPUT IMPEDANCE

|=I

.COMPATIBLE WITH TTL OUTPUTS

= 2V (MIN.) V

= 0.8V (MAX)

.PIN AND FUNCTION COMPATIBLE

WITH 54/74LS138

The M54/74HC138 is a high speed CMOS 3 TO 8

LINE DECODER fabricated in silicon gate C

MOS

technology. It has the same high speed perform-

ance ofLSTTL combinedwithtrue CMOSlowpower

consumption. If the device is enabled, 3 binary se-

lect inputs (A, B and C) determine which one of the

outputs will go low.If enable input G1 is held low or

either G2A or G2B is held high, the decoding func-

tion is inhibited and all the 8 outputs go high. Three

enable inputs are provided toease cascade connec-

tion and application of address decoders for mem-

ory systems. All inputs are equipped with protection

circuits against static discharge and tran- sient ex-

cess voltage.This integrated circuit has input and

output characteristics that are fully compatible with

54/74 LSTTL logic families. M54/74HCT devices

are designed to directly interface HSC

MOS sys-

tems with TTL and NMOS components. They are

also plug in replacements for LSTTL devices giving

a reduction of power consumption.

1/10

Summary of content (10 pages)

PAGE 1
M54HCT138 M74HCT138 3 TO 8 LINE DECODER (INVERTING) . . . . . . . HIGH SPEED tPD = 16 ns (TYP.) at VCC = 5 V LOW POWER DISSIPATION ICC = 4 µA AT TA = 25 °C OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS BALANCED PROPAGATION DELAYS tPLH = tPHL SYMMETRICAL OUTPUT IMPEDANCE |IOH| = IOL COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN.) VIL = 0.8V (MAX) PIN AND FUNCTION COMPATIBLE WITH 54/74LS138 DESCRIPTION The M54/74HC138 is a high speed CMOS 3 TO 8 LINE DECODER fabricated in silicon gate C 2MOS technology.
PAGE 2
M54/M74HCT138 TRUTH TABLE INPUTS ENABLE G2B G2A X X X H H X L L L L L L L L L L L L L L L L G1 L X X H H H H H H H H C X X X L L L L H H H H SELECT B X X X L L H H L L H H OUTPUTS A X X X L H L H L H L H Y0 H H H L H H H H H H H Y1 H H H H L H H H H H H Y2 H H H H H L H H H H H Y3 H H H H H H L H H H H Y4 H H H H H H H L H H H X: Don’t Care PIN DESCRIPTION IEC LOGIC SYMBOL PIN No 1, 2, 3 SYMBOL A, B, C NAME AND FUNCTION Address Inputs 4, 5 G2A, G2B Enable Inputs 6 15, 14, 13, 12, 11, 10,
PAGE 3
M54/M74HCT138 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VCC VI Supply Voltage DC Input Voltage -0.5 to +7 -0.5 to VCC + 0.5 V V VO DC Output Voltage -0.5 to VCC + 0.
PAGE 4
M54/M74HCT138 DC SPECIFICATIONS Test Conditions Symbol Parameter VCC (V) VIH High Level Input Voltage 4.5 to 5.5 V IL Low Level Input Voltage 4.5 to 5.5 V OH High Level Output Voltage VOL II ICC ∆ICC 4/10 Low Level Output Voltage Input Leakage Current Quiescent Supply Current Additional worst case supply current Value TA = 25 oC 54HC and 74HC Min. Typ. Max. 2.0 -40 to 85 oC -55 to 125 oC 74HC 54HC Min. Max. Min. Max. 2.0 0.8 4.5 VI = IO=-20 µA VIH or IO=-4.0 mA V IL 4.
PAGE 5
M54/M74HCT138 AC ELECTRICAL CHARACTERISTICS (C L = 50 pF, Input t r = tf = 6 ns) Test Conditions Value Symbol Parameter VCC (V) TA = 25 oC 54HC and 74HC Min. Typ. Max. -40 to 85 oC -55 to 125 oC 74HC 54HC Min. Max. Min. Max. tTLH tTHL Output Transition Time 4.5 8 15 19 22 tPLH tPHL Propagation Delay Time (A, B, C - Y) 4.5 17 30 38 45 tPLH tPHL Propagation Delay Time (G1 - Y) 4.5 tPLH tPHL Propagation Delay Time (G2 - Y) 4.
PAGE 6
M54/M74HCT138 Plastic DIP16 (0.25) MECHANICAL DATA mm DIM. MIN. a1 0.51 B 0.77 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L Z 3.3 0.130 1.27 0.
PAGE 7
M54/M74HCT138 Ceramic DIP16/1 MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 20 0.787 B 7 0.276 D E 3.3 0.130 0.38 e3 0.015 17.78 0.700 F 2.29 2.79 0.090 0.110 G 0.4 0.55 0.016 0.022 H 1.17 1.52 0.046 0.060 L 0.22 0.31 0.009 0.012 M 0.51 1.27 0.020 0.050 N P Q 10.3 7.8 8.05 5.08 0.406 0.307 0.317 0.
PAGE 8
M54/M74HCT138 SO16 (Narrow) MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.004 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45° (typ.) D 9.8 E 5.8 10 0.385 6.2 0.228 0.393 0.244 e 1.27 0.050 e3 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.62 0.024 8° (max.
PAGE 9
M54/M74HCT138 PLCC20 MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 9.78 10.03 0.385 0.395 B 8.89 9.04 0.350 0.356 D 4.2 4.57 0.165 0.180 d1 2.54 0.100 d2 0.56 0.022 E 7.37 8.38 0.290 0.330 e 1.27 0.050 e3 5.08 0.200 F 0.38 0.015 G 0.101 0.004 M 1.27 0.050 M1 1.14 0.
PAGE 10
M54/M74HCT138 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice.