5962-86869012A 查看數據表（PDF） - Tachyonics CO,. LTD
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5962-86869012A Datasheet PDF : 20 Pages
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SN54ALS157A, SN54ALS158
SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158
QUAD 1ĆOFĆ2 DATA SELECTORS/MULTIPLEXERS
SDAS081C − APRIL 1982 − REVISED DECEMBER 1994
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
From Output
Under Test
CL
(see Note A)
VCC
Test
Point
RL
From Output
Under Test
CL
(see Note A)
RL
Test
Point
From Output
Under Test
CL
(see Note A)
7V
RL = R1 = R2
S1
R1
Test
Point
R2
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
Timing
Input
tsu
Data
Input
1.3 V
th
1.3 V
1.3 V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
3.5 V
0.3 V
3.5 V
0.3 V
High-Level
Pulse
Low-Level
Pulse
1.3 V
tw
1.3 V
1.3 V
1.3 V
VOLTAGE WAVEFORMS
PULSE DURATIONS
3.5 V
0.3 V
3.5 V
0.3 V
Output
Control
(low-level
enabling)
tPZL
Waveform 1
S1 Closed
(see Note B)
tPZH
Waveform 2
S1 Open
(see Note B)
1.3 V
1.3 V
tPHZ
1.3 V
1.3 V
tPLZ
3.5 V
0.3 V
[3.5 V
VOL
0.3 V
VOH
0.3 V
[0 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
Input
tPLH
In-Phase
Output
tPHL
Out-of-Phase
Output
(see Note C)
1.3 V
1.3 V
1.3 V
1.3 V
3.5 V
0.3 V
tPHL
VOH
1.3 V
VOL
tPLH
VOH
1.3 V
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
8
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