December 1990 16
Philips Semiconductors Product specification
8-channel analog multiplexer/demultiplexer
with latch
74HC/HCT4351
TEST CIRCUIT AND WAVEFORMS
Fig.20 Test circuit for measuring AC performance.
Conditions
TEST SWITCH V
is
t
PZH
V
EE
V
CC
t
PZL
V
CC
V
EE
t
PHZ
V
EE
V
CC
t
PLZ
V
CC
V
EE
others open pulse
FAMILY AMPLITUDE V
M
t
r
; t
f
f
max
;
PULSE WIDTH
OTHER
74HC V
CC
50%
< 2 ns 6 ns
74HCT 3.0 V 1.3 V < 2 ns 6 ns
C
L
= load capacitance including jig and probe capacitance (see AC CHARACTERISTICS for values).
R
T
= termination resistance should be equal to the output impedance Z
O
of the pulse generator.
t
r
=t
f
= 6 ns; when measuring f
max
, there is no constraint on t
r
, t
f
with 50% duty factor.
Conditions
TEST SWITCH V
is
t
PZH
V
EE
V
CC
t
PZL
V
CC
V
EE
t
PHZ
V
EE
V
CC
t
PLZ
V
CC
V
EE
others open pulse
FAMILY AMPLITUDE V
M
t
r
; t
f
f
max
;
PULSE WIDTH
OTHER
74HC V
CC
50%
< 2 ns 6 ns
74HCT 3.0 V 1.3 V < 2 ns 6 ns
C
L
= load capacitance including jig and probe capacitance (see AC CHARACTERISTICS for values).
R
T
= termination resistance should be equal to the output impedance Z
O
of the pulse generator.
t
r
=t
f
= 6 ns; when measuring f
max
, there is no constraint on t
r
, t
f
with 50% duty factor.
Fig.21 Input pulse definitions.
