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| HD74HC640_15 Datasheet, PDF (8/13 Pages) Renesas Technology Corp – Octal Bus Transceivers (with 3-state outputs) | |||
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HD74HC640, HD74HC643
HD74HC643
VCC
VCC
G
Input
Pulse Generator
Zout = 50 â¦
Input
Pulse Generator
Zout = 50 â¦
DIR
S1
A1
B1
Output
1 k⦠S2
CL =
50 pF
OPEN
GND
VCC
TEST
tPLH / t PHL
tZH/ t HZ
tZL / t LZ
S2
OPEN
GND
VCC
Notes : 1. CL includes probe and jig capacitance.
2. A2âB2, A3âB3, A4âB4, A5âB5, A6âB6, A7âB7, A8âB8 are identical to above load circuit.
3. S1 is a input / output swich.
Rev.2.00 Mar 30, 2006 page 6 of 10
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