Datasheet

September 1993 15
Philips Semiconductors Product specification
16-channel analog
multiplexer/demultiplexer
74HC/HCT4067
TEST CIRCUIT AND WAVEFORMS
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines” .
Fig.18 Test circuit for measuring AC performance.
Conditions
TEST SWITCH V
is
t
PZH
t
PZL
t
PHZ
t
PLZ
others
GND
V
CC
GND
V
CC
open
V
CC
GND
V
CC
GND
pulse
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.19 Input pulse definitions.
FAMILY
AMPLI-
TUDE
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