MC54F157AJ Просмотр технического описания (PDF) - Motorola => Freescale
Номер в каталоге
Компоненты Описание
Список матч
MC54F157AJ Datasheet PDF : 2 Pages
| |||
MC74F157A
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Ambient Temperature Range
IOH
Output Current — High
IOL
Output Current — Low
Min
Typ
Max
Unit
74
4.5
5.0
5.5
V
74
0
25
70
°C
74
–1.0
mA
74
20
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
V Guaranteed Input HIGH Voltage
VIL
Input LOW Voltage
0.8
V Guaranteed Input LOW Voltage
VIK
Input Clamp Diode Voltage
–1.2
V
IIN = –18 mA
VCC = MIN
VOH
Output HIGH Voltage
74
2.7
3.4
V
IOH = –1.0 mA
VCC = 4.75 V
74
2.5
VCC = 4.50 V
VOL
Output LOW Voltage
0.35 0.5
V
IOL = 20 mA
VCC = MIN
IIH
Input HIGH Current
20
µA VIN = 2.7 V
VCC = MAX
100
µA VIN = 7.0 V
IIL
Input LOW Current
–0.6 mA VIN = 0.5 V
VCC = MAX
IOS
Output Short Circuit Current (Note 2)
–60
–150 mA VOUT = 0 V
VCC = MAX
ICC
Power Supply Current
15
23
mA All Inputs = 4.5 V
VCC = MAX
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Propagation Delay
S to Zn
Propagation Delay
E to Zn
Propagation Delay
In to Zn
Parameter
74F
74F
TA = +25°C
VCC = +5.0 V
CL = 50 pF
TA = 0°C to 70°C
VCC = 5.0 V ±10%
CL = 50 pF
Min
Max
Min
Max
Unit
3.5
10
3.5
11
ns
3.0
7.0
3.0
8.0
3.5
9.5
3.5
11
ns
2.5
6.5
2.5
7.0
2.0
6.0
2.0
6.5
ns
2.5
5.5
2.0
7.0
FUNCTIONAL DESCRIPTION
The F157A 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 F157A is the logic implementation of a
4-pole, 2-position switch where the position of the switch is de-
termined by the logic levels supplied to the Select input. The
logic equations for the outputs are shown below:
Za = E • (I1a • S + I0a • S)
Zc = E • (I1c • S + I0c • S)
A common use of the F157A is the moving of data from two
groups of registers to four common output busses. The partic-
ular 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 F157A can generate any four of the 16 different
functions of two variables with one variable common. This is
useful for implementing highly irregular logic.
Zb = E • (I1b • S + I0b • S)
Zd = E • (I1d • S + I0d • S)
FAST AND LS TTL DATA
4-68
Share Link: 