MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Quad 2-Input Data
Selectors/Multiplexers
High鈥揚erformance Silicon鈥揋ate CMOS
The MC54/74HC157A is identical in pinout to the LS157. The device
inputs are compatible with standard CMOS outputs; with pullup resistors,
they are compatible with LSTTL outputs.
This device routes 2 nibbles (A or B) to a single port (Y) as determined by
the Select input. The data is presented at the outputs in noninverted form. A
high level on the Output Enable input sets all four Y outputs to a low level.
The HC157A is similar in function to the HC257 which has 3鈥搒tate outputs.
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Output Drive Capability: 10 LSTTL Loads
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2.0 to 6.0 V
Low Input Current: 1.0
碌A
High Noise Immunity Characteristic of CMOS Devices
In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
鈥?/div>
Chip Complexity: 82 FETs or 20.5 Equivalent Gates
MC54/74HC157A
J SUFFIX
CERAMIC PACKAGE
CASE 620鈥?0
1
16
16
1
N SUFFIX
PLASTIC PACKAGE
CASE 648鈥?8
D SUFFIX
SOIC PACKAGE
CASE 751B鈥?5
DT SUFFIX
TSSOP PACKAGE
CASE 948F鈥?1
16
1
16
1
ORDERING INFORMATION
MC54HCXXXAJ
MC74HCXXXAN
MC74HCXXXAD
MC74HCXXXADT
Ceramic
Plastic
SOIC
TSSOP
LOGIC DIAGRAM
2
5
11
14
4
3
6
10
13
7
9
12
Y0
Y1
Y2
Y3
DATA
OUTPUTS
A0
NIBBLE
A INPUTS
A1
A2
A3
B0
NIBBLE
B INPUTS
B1
B2
B3
PIN ASSIGNMENT
SELECT
A0
B0
Y0
A1
B1
Y1
GND
1
15
PIN 16 = VCC
PIN 8 = GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
OUTPUT
ENABLE
A3
B3
Y3
A2
B2
Y2
SELECT
OUTPUT
ENABLE
FUNCTION TABLE
Inputs
Output
Enable
H
L
L
Select
X
L
H
Outputs
Y0 鈥?Y3
L
A0 鈥?A3
B0 鈥?B3
X = don鈥檛 care
A0 鈥?A3, B0 鈥?B3 = the levels
of the respective Data鈥揥ord
Inputs.
10/95
漏
Motorola, Inc. 1995
1
REV 6
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