74HC_HCT4851_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 2 September 2008 14 of 20
NXP Semiconductors
74HC4851; 74HCT4851
8-channel analog MUX/DEMUX with injection-current effect control
[1] For 74HCT4851: input voltage V
I
= 3.0 V.
a. Input pulse definition
Definitions for test circuit:
R
L
= load resistance.
C
L
= load capacitance including jig and probe capacitance.
R
T
= termination resistance should be equal to the output impedance Z
o
of the pulse generator.
b. Load circuit
Test data is given in Table 11.
Fig 14. Input pulse definition and load circuit
001aac221
V
M
V
M
t
W
t
W
10 %
90 % 90 %
0 V
V
I
V
I
negative
pulse
positive
pulse
0 V
V
M
V
M
90 %
10 % 10 %
t
f
t
r
t
r
t
f
001aaf883
V
CC
GND
V
I
V
O
V
CC
open
R
T
R
L
C
L
DUT
switch
G
Table 11. Test data
Test Input Output S1 position
Control E, Sn Switch Yn (Z) t
r
, t
f
Switch Z (Yn)
V
I
[1]
V
I
C
L
R
L
t
PHL,
t
PLH
V
CC
V
CC
6 ns 50 pF - open
t
PHZ
, t
PZH
V
CC
V
CC
6ns 50pF 10kΩ GND
t
PLZ
, t
PZL
V
CC
V
CC
6ns 50pF 10kΩ V
CC
C
PD
V
CC
V
CC
6 ns 0 pF - open
