CY5474FCT157T Datasheet, PDF (1/6 Pages) Texas Instruments – Quad 2-Input Multiplexer

Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
CY54/74FCT157T
SCCS014 - May 1994 - Revised February 2000
Quad 2-Input Multiplexer
Features
• Function, pinout, and drive compatible with FCT and
F logic
• FCT-C speed at 4.3 ns max. (Com’l),
FCT-A speed at 5.0 ns max. (Com’l)
• Reduced V_OH (typically = 3.3V) versions of equivalent
FCT functions
• Edge-rate control circuitry for significantly improved
noise characteristics
• Power-off disable feature
• Matched rise and fall times
• Fully compatible with TTL input and output logic levels
• ESD > 2000V
• Extended commercial range of −40˚C to +85˚C
• Sink current
Source current
64 mA (Com’l),
32 mA (Mil)
32 mA (Com’l),
12 mA (Mil)
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.
Logic Block Diagram, FCT157T
I_0a
I_1a
I_0b
I_1b
I_0c
I_1c
I_0d
I_1d E S
Y_a
Y_b
Y_c
Y_d
Pin Configurations
LCC
Top View
8 7 654
Y_{b 9}
3 ^I0a
GND ₁₀
2S
NC 11 ^FCT157T ₁ NC
Y_c 12
20 VCC
I_1c 13
19 E
14 1516 17 18
SOIC/QSOP
Top View
S
I_0a
I_1a
Y_a
I_0b
I_1b
Y_b
GND
1
16 VCC
2
15 E
3
14 ^I0d
4 ^FCT157T 13 I1d
5
12 ^Yd
6
11 ^I0c
7
10 ^I1c
8
9 Yc
Logic Symbol
E I_0a I_1a
S
Y_a
I_0b I_1b I_0c I_1c
FCT157T
Y_b
Y_c
I_0d I_1d
Y_d
FCT157T–1
Copyright © 2000, Texas Instruments Incorporated