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| 74HC244_05 Datasheet, PDF (14/22 Pages) NXP Semiconductors – Octal buffer/line driver; 3-state | |||
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Philips Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
VI 90 %
tW
negative
pulse
VM
10 %
0V
tf
VI
positive
pulse
tr
90 %
VM
10 %
0V
tW
VM
tr
tf
VM
PULSE
VI
GENERATOR
VCC
VO
DUT
RT
VCC
RL S1
CL
open
001aad983
Test data is given in Table 12.
Deï¬nitions 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
tr, tf
74HC244
VCC
6 ns
74HCT244 3 V
6 ns
Load
CL
15 pF, 50 pF
15 pF, 50 pF
RL
1 kâ¦
1 kâ¦
S1 position
tPHL, tPLH tPZH, tPHZ
open
GND
open
GND
tPZL, tPLZ
VCC
VCC
74HC_HCT244_3
Product data sheet
Rev. 03 â 22 December 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
14 of 22
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