74AHC_AHCT126_4 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 04 — 12 August 2009 9 of 15
NXP Semiconductors
74AHC126; 74AHCT126
Quad buffer/line driver; 3-state
Table 8. Measurement points
Type Input Output
V
M
V
M
V
X
V
Y
74AHC126 0.5 × V
CC
0.5 × V
CC
V
OL
+ 0.3 V V
OH
− 0.3 V
74AHCT126 1.5 V 0.5 × V
CC
V
OL
+ 0.3 V V
OH
− 0.3 V
Test data is given in Table 9.
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 8. Test circuitry 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 9. 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
74AHC126 V
CC
≤ 3.0 ns 15 pF, 50 pF 1 kΩ open GND V
CC
74AHCT126 3.0 V ≤ 3.0 ns 15 pF, 50 pF 1 kΩ open GND V
CC
