Philips Semiconductors Product specification
74F157A, 74F158AData selectors/multiplexers
74F157A: Quad 2-input data selector/multiplexer, non-inverting
74F158A: Quad 2-input data selector/multiplexer, inverting
2
2000 Jun 30 853-0346 24024
DESCRIPTION
The 74F157A is a high speed Quad 2-Input Multiplexer which
selects 4 bits of data from one of two sources under the control of a
common Select input (S). The Enable input (E
) is active when Low.
When E
is High, all of the outputs (Yn) are forced Low regardless of
all other input conditions.
Moving data from two registers to a common output bus is a
common use of the 74F157A. The state of the Select input
determines the particular register from which the data comes.
The device is the logic implementation of a 4-pole, 2-position switch
where the position of the switch is determined by the logic levels
supplied to the Select input.
The 74F158A is similar, but has inverting outputs (Y
n).
• Industrial temperature range (–10°C to +85°C) available for
74F157A
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F157A 4.6ns 15mA
74F158A 3.7ns 10mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V ±10%, T
amb
= 0°C to +70°C
INDUSTRIAL RANGE
V
CC
= 5V ±10%, T
amb
= –40°C to +85°C
PKG. DWG. #
16-pin plastic DIP N74F157AN, N174F158AN I74F157AN SOT38-4
16-pin plastic SO N74F157AD, N74F158AD I74F157AD SOT109-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW
Ina, Inb, Inc, Ind Data inputs 1.0/1.0 20µA/0.6mA
S Select input 1.0/1.0 20µA/0.6mA
E Enable input 1.0/1.0 20µA/0.6mA
Ya–Yd Data outputs (74F157A) 50/33 1.0mA/20mA
Ya–Yd Data outputs (74F158A) 50/33 1.0mA/20mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
PIN CONFIGURATIONS, 74F157A 74F158A
16
15
14
13
12
11
107
6
5
4
3
2
1
Yb
V
CC
Yd
I0c
I1c
I1d
E
I0d
S
I0a
I1b
I1a
Ya
I0b
98GND Yc
SF00215
16
15
14
13
12
11
107
6
5
4
3
2
1
Y
b
V
CC
Yd
I0c
I1c
I1d
E
I0d
S
I0a
I1b
I1a
Y
a
I0b
98GND Yc
SF00216
LOGIC SYMBOLS, 74F157A 74F158A
V
CC
= Pin 16
GND = Pin 8
SF00217
1
15
S
E
2356111014
I0a I1a I0b I1b I0c I1c I0d
Ya Yb Yc Yd
47912
13
I1d
V
CC
= Pin 16
GND = Pin 8
SF00218
1
15
S
E
2356111014
I0a I1a I0b I1b I0c I1c I0d
Ya Yb Yc Yd
47912
13
I1d
