Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modi鏗乪d to remove devices not offered.
CY54/74FCT157T
SCCS014 - May 1994 - Revised February 2000
Quad 2-Input Multiplexer
Functional Description
The FCT157T is a quad two-input multiplexer that selects four
bits of data from two sources under the control of a common
data Select input (S). The Enable input (E) is Active LOW.
When (E) is HIGH, all of the outputs (Y) are forced LOW
regardless of all other input conditions.
Moving data from two groups of registers to four common
output buses is a common use of the FCT157T. The state of
the Select input determines the particular register from which
the data comes. It can also be used as a function generator.
The device is useful for implementing highly irregular logic by
generating any four of the sixteen different functions of two
variables with one variable common.
The FCT157T is a logic implementation of a four-pole,
two-position switch where the position of the switch is
determined by the logic levels supplied to the Select input.
The outputs are designed with a power-off disable feature to
allow for live insertion of boards.
Features
鈥?/div>
Function, pinout, and drive compatible with FCT and
F logic
鈥?/div>
FCT-C speed at 4.3 ns max. (Com鈥檒),
FCT-A speed at 5.0 ns max. (Com鈥檒)
鈥?/div>
Reduced V
OH
(typically = 3.3V) versions of equivalent
FCT functions
鈥?/div>
Edge-rate control circuitry for signi鏗乧antly improved
noise characteristics
鈥?/div>
Power-off disable feature
鈥?/div>
Matched rise and fall times
鈥?/div>
Fully compatible with TTL input and output logic levels
鈥?ESD > 2000V
鈥?/div>
Extended commercial range of
鈭?0藲C
to +85藲C
鈥?Sink current
64 mA (Com鈥檒),
32 mA (Mil)
Source current
32 mA (Com鈥檒),
12 mA (Mil)
Logic Block Diagram, FCT157T
I
0a
I
1a
I
0b
I
1b
I
0c
I
1c
I
0d
I
1d
E
S
Pin Configurations
LCC
Top View
I 0b
NC
Ya
I 1a
I 1b
S
3
2
1
20
19
I 0d
I
0a
S
NC
V
CC
E
I
0a
I
1a
Y
a
I
0b
I
1b
Y
b
GND
SOIC/QSOP
Top View
1
2
3
16
15
V
CC
E
I
0d
I
1d
Y
d
I
0c
I
1c
Y
c
8
Y
b
GND
NC
Y
c
I
1c
9
10
11
12
13
7 6 5 4
FCT157T
14
4 FCT157T 13
5
6
7
8
12
11
10
9
14 1516 17 18
I 0c
Yd
NC
I 1d
Y
a
Y
b
Y
c
Y
d
Logic Symbol
E
S
I
0a
I
1a
I
0b
I
1b
I
0c
I
1c
I
0d
I
1d
FCT157T
Y
a
Y
b
Y
c
Y
d
鈥?
FCT157T
Copyright
漏
2000, Texas Instruments Incorporated
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