WS74HC373
V
DD
Test
Point
C
L
(see Note A)
Parameter
R
L
S1
R
L
t
en
t
PZH
1kΩ
From Output
Under Test
t
PZL
C
L
50 pF
or
150 pF
S1
S2
Open
Closed
Closed
Open
S2
t
dis
t
PHZ
1kΩ
50 pF
Open
Closed
t
PLZ
Closed
Open
t
pd
or t
t
-
50 pF
or
150 pF
Open
Open
Notes:
A.
B.
C.
D.
E.
F.
G.
C
L
includes probe and test-fixture capacitance.
Waveform 1 is for an output with internal conditions such that the output is low except when
disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when
disabled by the output control.
Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by
generators having the following characteristics:
PRR≤ 1 MHz, Zo = 50Ω, t
r
=6ns, t
f
=6ns.
The outputs are measured one at a time with one input transition per measurement.
t
PLZ
and t
PHZ
are the same as t
dis
.
t
PZL
and t
PZH
are the same as t
en
.
t
PLH
and t
PHL
are the same as t
pd
.
PIN DESCRIPTION
PIN NO.
3, 4, 7, 8, 13, 14, 17, 18
2, 5, 6, 9, 12, 15, 16, 19
10
1
11
20
SYMBOL
1D - 8D
1Q - 8Q
GND
OE
LE
VCC
DESCRIPTION
Data Inputs
Outputs
Ground (0V)
Output-enable
latch-enable
Positive power supply
11
OE
1Q
1
20
VCC
8Q
3
4
1D
2D
3D
4D
5D
6D
7D
8D
LE
1Q
2
5
6
9
1D
2D
2Q
8D
7
2Q
3Q
4Q
7D
8
7Q
13
3Q
3D
4D
6Q
14
5Q
12
6Q
15
7Q
16
6D
17
5D
18
4Q
GND
5Q
8Q
19
OE
1
10
11
LE
Pin Configuration
(DIP-20)
Logic Symbol
5
WINGS [ WING SHING COMPUTER COMPONENTS ]
