74HC244; 74HCT244
Philips Semiconductors
Octal buffer/line driver; 3-state
t
W
V
I
90 %
negative
pulse
V
V
V
M
M
10 %
0 V
t
t
r
f
t
t
f
r
V
I
90 %
positive
pulse
V
M
M
10 %
0 V
t
W
V
V
CC
CC
V
V
O
I
R
L
S1
PULSE
GENERATOR
open
DUT
R
T
C
L
001aad983
Test data is given in Table 12.
Definitions test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator
CL = Load capacitance including jig and probe capacitance
RL = Load resistor
S1 = Test selection switch
Fig 8. Load circuitry for switching times
Table 12: Test data
Type
Input
VI
Load
CL
S1 position
tr, tf
6 ns
6 ns
RL
tPHL, tPLH tPZH, tPHZ tPZL, tPLZ
74HC244
VCC
3 V
15 pF, 50 pF 1 kΩ
15 pF, 50 pF 1 kΩ
open
open
GND
GND
VCC
VCC
74HCT244
74HC_HCT244_3
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 22 December 2005
14 of 22
NXP [ NXP ]
