M54HC138 M74HC138: 3 To 8 Line Decoder (Inverting)
M54HC138 M74HC138: 3 To 8 Line Decoder (Inverting)
M54HC138 M74HC138: 3 To 8 Line Decoder (Inverting)
M74HC138
. HIGH SPEED
. ICC = 4 µA AT TA = 25 °C
OUTPUT DRIVE CAPABILITY
. 10 LSTTL LOADS
BALANCED PROPAGATION DELAYS B1R F1R
. tPLH = tPHL
SYMMETRICAL OUTPUT IMPEDANCE
(Plastic Package) (Ceramic Package)
. |IOH| = IOL
HIGH NOISE IMMUNITY
. VCC (OPR) = 2 V TO 6 V
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS138
(Micro Package)
ORDER CODES :
M54HC138F1R
(Chip Carrier)
M74HC138M1R
M74HC138B1R M74HC138C1R
DESCRIPTION
The M54/74HC138 is a high speed CMOS 3 TO 8
LINE DECODER fabricated in silicon gate C 2MOS PIN CONNECTIONS (top view)
technology.
It has the same high speed performance of LSTTL
combined with true CMOS low power consumption.
If the device is enabled, 3 binary select 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 function is inhibited
and all the 8 outputs go high.
Three enable inputs are provided to ease cascade
connection and application of address decoders for
memory systems. All inputs are equipped with pro-
tection circuits against static discharge and tran-
sient excess voltage.
NC =
No Internal
Connection
TRUTH TABLE
INPUTS
OUTPUTS
ENABLE SELECT
G2B G2A G1 C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X X L X X X H H H H H H H H
X H X X X X H H H H H H H H
H X X X X X H H H H H H H H
L L H L L L L H H H H H H H
L L H L L H H L H H H H H H
L L H L H L H H L H H H H H
L L H L H H H H H L H H H H
L L H H L L H H H H L H H H
L L H H L H H H H H H L H H
L L H H H L H H H H H H L H
L L H H H H H H H H H H H L
X: Don’t Care
LOGIC DIAGRAM
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M54/M74HC138
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M54/M74HC138
DC SPECIFICATIONS
Test Conditions Value
o
Symbol Parameter TA = 25 C -40 to 85 oC -55 to 125 oC Unit
VCC
54HC and 74HC 74HC 54HC
(V)
Min. Typ. Max. Min. Max. Min. Max.
VIH High Level Input 2.0 1.5 1.5 1.5
Voltage 4.5 3.15 3.15 3.15 V
6.0 4.2 4.2 4.2
V IL Low Level Input 2.0 0.5 0.5 0.5
Voltage 4.5 1.35 1.35 1.35 V
6.0 1.8 1.8 1.8
V OH High Level 2.0 1.9 2.0 1.9 1.9
VI =
Output Voltage 4.5 IO=-20 µA 4.4 4.5 4.4 4.4
VIH
V
6.0 or 5.9 6.0 5.9 5.9
4.5 V IL IO=-4.0 mA 4.18 4.31 4.13 4.10
6.0 IO=-5.2 mA 5.68 5.8 5.63 5.60
VOL Low Level Output 2.0 0.0 0.1 0.1 0.1
VI =
Voltage 4.5 IO= 20 µA 0.0 0.1 0.1 0.1
VIH
V
6.0 or 0.0 0.1 0.1 0.1
4.5 V IL IO= 4.0 mA 0.17 0.26 0.33 0.40
6.0 IO= 5.2 mA 0.18 0.26 0.33 0.40
II Input Leakage VI = VCC or GND ±0.1 ±1 ±1 µA
6.0
Current
ICC Quiescent Supply 6.0 VI = VCC or GND 4 40 80 mA
Current
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M54/M74HC138
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M54/M74HC138
mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
a1 0.51 0.020
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 3.3 0.130
Z 1.27 0.050
P001C
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M54/M74HC138
mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 20 0.787
B 7 0.276
D 3.3 0.130
E 0.38 0.015
e3 17.78 0.700
N 10.3 0.406
Q 5.08 0.200
P053D
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M54/M74HC138
mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 1.75 0.068
a1 0.1 0.2 0.004 0.007
a2 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 10 0.385 0.393
E 5.8 6.2 0.228 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 0.62 0.024
S 8° (max.)
P013H
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M54/M74HC138
mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
d1 2.54 0.100
d2 0.56 0.022
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 0.045
P027A
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M54/M74HC138
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. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
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