Datasheet

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     
SCLS113D − DECEMBER 1982 − REVISED SEPTEMBER 2003
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, C
L
= 150 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
V
CC
T
A
= 25°C SN54HC157 SN74HC157
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
2 V 81 190 290 235
A or B Y
4.5 V 23 38 58 47
A or B
Y
6 V 18 33 49 41
2 V 81 210 320 260
t
pd
A/B Y
4.5 V 23 42 64 52
ns
t
pd
A/B
Y
6 V 18 36 54 45
ns
2 V 91 190 290 235
G Y
4.5 V 24 38 58 47
G
Y
6 V 18 33 49 41
2 V 45 210 315 265
t
t
Y
4.5 V 17 42 63 53
ns
t
t
Y
6 V 13 36 53 45
ns
operating characteristics, T
A
= 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
pd
Power dissipation capacitance No load 40 pF
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
50%50%
10%10%
90% 90%
V
CC
0 V
t
r
t
f
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
50%50%
10%10%
90% 90%
V
CC
V
OH
V
OL
0 V
t
r
t
f
Input
In-Phase
Output
50%
t
PLH
t
PHL
50% 50%
10% 10%
90%90%
V
OH
V
OL
t
r
t
f
t
PHL
t
PLH
Out-of-Phase
Output
Test
Point
From Output
Under Test
C
L
(see Note A)
LOAD CIRCUIT
NOTES: A. C
L
includes probe and test-fixture capacitance.
B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, Z
O
= 50 Ω, t
r
= 6 ns, t
f
= 6 ns.
C. The outputs are measured one at a time with one input transition per measurement.
D. t
PLH
and t
PHL
are the same as t
pd
.
Figure 1. Load Circuit and Voltage Waveforms