Hitachi HD74AC157 Quad 2-input multiplexer Datasheet

HD74AC157
Quad 2-Input Multiplexer
Description
The HD74AC157 is a high-speed quad 2-input multiplexer. Four bits of data from two sources can be
selected using the common Select and Enable inputs. The four outputs present the selected data in the true
(noninverted) form. The HD74AC157 can also be used as a function generator.
Feature
• Outputs Source/Sink 24 mA
Pin Arrangement
S 1
16 VCC
I0a 2
15 E
I1a 3
14 I0c
Za 4
13 I1c
I0b 5
12 Zc
I1b 6
11 I0d
Zb 7
10 I1d
GND 8
9 Zd
(Top view)
HD74AC157
Logic Symbol
E
I0a I1a I0b I1b I0c
I1c Iod I1d
S
Za
Zb
Zc
Zd
Pin Names
I0a to I0d
I1a to I1d
E
S
Za to Zd
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input
Select Input
Outputs
Functional Description
The HD74AC157 is a quad 2-input multiplexer. It selects four bits of data from two sources under the
control of a common Select input (S). The Enable input (E) is active-Low. when E is High, all of the
outputs (Z) are forced Low regardless of all other inputs. The HD74AC157 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 logic equations for the outputs are shown below:
Za = E•(I1a•S + I0a •S)
Zb = E•(I1b•S + I0b•S)
Zc = E•(I1c•S + I0c •S)
Zd = E•(I1d•S + I0d•S)
A common use of the HD74AC157 is the moving of data from two groups of register to four common
output busses. The particular register from which the data comes is determined by the state of the Select
input. A less obvious use is as a function generator. The HD74AC157 can generate any four of the sixteen
different functions of two variables with one variable common. This is useful for implementing gating
functions.
2
HD74AC157
Truth Table
Inputs
Output
E
S
I0
I1
Z
H
X
X
X
L
L
H
X
L
L
L
H
X
H
H
L
L
L
X
L
L
L
H
X
H
H :
L :
X :
High Voltage Level
Low Voltage Level
Immaterial
Logic Diagram
I0a
I1a
Za
I0b
I1b
Zb
I0c
I1c
Zc
I0d
I1d
E
S
Zd
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
3
HD74AC157
DC Characteristics (unless otherwise specified)
Item
Symbol
Max
Unit
Condition
Maximum quiescent supply current
I CC
80
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = Worst case
Maximum quiescent supply current
I CC
8.0
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = 25°C
AC Characteristics: HD74AC157
Ta = +25°C
CL = 50 pF
Ta = –40°C to +85°C
CL = 50 pF
Item
Symbol
VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Propagation delay
t PLH
3.3
1.0
7.0
11.5
1.0
13.0
ns
5.0
1.0
5.5
9.0
1.0
10.0
3.3
1.0
6.5
11.0
1.0
12.0
5.0
1.0
5.0
8.5
1.0
9.5
3.3
1.0
7.0
11.5
1.0
13.0
5.0
1.0
5.5
9.0
1.0
10.0
3.3
1.0
6.5
11.0
1.0
12.0
5.0
1.0
5.5
9.0
1.0
9.5
3.3
1.0
5.0
8.5
1.0
9.0
5.0
1.0
4.0
6.5
1.0
7.0
3.3
1.0
5.0
8.0
1.0
9.0
5.0
1.0
4.0
6.5
1.0
7.0
S to Zn
Propagation delay
t PHL
S to Zn
Propagation delay
t PLH
E to Zn
Propagation delay
t PHL
E to Zn
Propagation delay
t PLH
I n to Zn
Propagation delay
t PHL
I n to Zn
Note:
1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item
Symbol
Typ
Unit
Condition
Input capacitance
CIN
4.5
pF
VCC = 5.5 V
Power dissipation capacitance
CPD
50.0
pF
VCC = 5.0 V
4
ns
ns
ns
ns
ns
Unit: mm
19.20
20.00 Max
1
7.40 Max
9
6.30
16
8
1.3
0.48 ± 0.10
2.54 Min 5.06 Max
2.54 ± 0.25
0.51 Min
1.11 Max
7.62
+ 0.13
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-16
Conforms
Conforms
1.07 g
Unit: mm
10.06
10.5 Max
9
1
8
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
5.5
16
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-16DA
—
Conforms
0.24 g
Unit: mm
9.9
10.3 Max
9
1
8
0.635 Max
*0.42 ± 0.08
0.40 ± 0.06
0.15
*0.22 ± 0.03
0.20 ± 0.03
1.27
0.11
0.14 +– 0.04
1.75 Max
3.95
16
0.10
6.10 +– 0.30
1.08
0° – 8°
0.67
0.60 +– 0.20
0.25 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-16DN
Conforms
Conforms
0.15 g
Unit: mm
4.40
5.00
5.30 Max
16
9
1
8
0.65
0.13 M
1.10 Max
0.65 Max
0.10
*Dimension including the plating thickness
Base material dimension
6.40 ± 0.20
0.07 +0.03
–0.04
0.20 ± 0.06
1.0
*0.17 ± 0.05
0.15 ± 0.04
0.08
*0.22 +– 0.07
0° – 8°
0.50 ± 0.10
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
TTP-16DA
—
—
0.05 g
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