74HC_HCT7403 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 4 — 24 September 2012 21 of 34
NXP Semiconductors
74HC7403; 74HCT7403
4-bit x 64-word FIFO register; 3-state
12.12 Test circuit for measuring switching times
Test data is given in Table 8.
Definitions test circuit:
R
T
= Termination resistance should be equal to output impedance Z
o
of the pulse generator.
C
L
= Load capacitance including jig and probe capacitance.
R
L
= Load resistance.
S1 = Test selection switch.
Fig 17. Test circuit for measuring switching times
V
M
V
M
t
W
t
W
10 %
90 %
0 V
V
I
V
I
negative
pulse
positive
pulse
0 V
V
M
V
M
90 %
10 %
t
f
t
r
t
r
t
f
001aad983
DUT
V
CC
V
CC
V
I
V
O
R
T
R
L
S1
C
L
open
G
Table 7. Measurement points
Type Input Output
V
M
V
M
V
X
V
Y
74HC7403 0.5V
CC
0.5V
CC
0.1V
CC
0.9V
CC
74HCT7403 1.3 V 1.3 V 0.1V
CC
0.9V
CC
Table 8. Test data
Type Input Load S1 position
V
I
t
r
, t
f
C
L
R
L
t
PHL
, t
PLH
t
PZH
, t
PHZ
t
PZL
, t
PLZ
74HC7403 V
CC
6ns 15pF, 50 pF 1k open GND V
CC
74HCT7403 3 V 6 ns 15 pF, 50 pF 1 k open GND V
CC
