NXP Semiconductors
74HC157; 74HCT157
Quad 2-input multiplexer
Table 7.
Dynamic characteristics
…continued
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF unless otherwise specified; for test circuit see
Figure 9.
Symbol Parameter
Conditions
T
amb
= 25
C
Min
t
t
C
PD
transition
time
power
dissipation
capacitance
nY; see
V
CC
= 4.5 V
C
L
= 50 pF; f = 1 MHz;
V
I
= GND to V
CC
T
amb
=
40 C
to +85
C
Min
-
-
Max
19
-
T
amb
=
40 C
to +125
C
Min
-
-
Max
22
-
Unit
Typ
7
70
Max
15
-
-
-
ns
pF
[1]
[2]
[3]
t
pd
is the same as t
PLH
and t
PHL
.
t
t
is the same as t
THL
and t
TLH
.
C
PD
is used to determine the dynamic power dissipation (P
D
in
W).
P
D
= C
PD
V
CC2
f
i
N +
(C
L
V
CC2
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in V;
N = number of inputs switching;
(C
L
V
CC2
f
o
) = sum of outputs.
11. Waveforms
V
I
nI0, nI1, S
input
GND
t
PHL
V
OH
nY output
V
OL
V
M
mna486
V
M
t
PLH
Measurement points are given in
V
OL
and V
OH
are typical voltage output levels that occur with the output load.
Fig 7. Propagation delay input (nI0, nI1, S) to output (nYn)
74HC_HCT157
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© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 3 — 31 December 2010
8 of 18
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