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HD74LS163A Datasheet, PDF (5/12 Pages) Hitachi Semiconductor – Synchronous 4-bit Binary Counters(synchronous clear)
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HD74LS163A
Timing Method
Clock
Clear
Load
Data
Outputs
A to D
Enable
P or T
tw (CK)
1.3V
1.3V
tsu th
1.3V
1.3V
1.3V
tsu th
3V
1.3V
0V
3V
0V
3V
1.3V
1.3V
0V
tsu th
3V
1.3V
1.3V
tsu
0V
th
3V
1.3V 1.3V
0V
Testing Method
Test Circuit
4.5V
P.G.
Zout = 50Ω
Input
P.G.
Zout = 50Ω
Input
VCC
QA
Load
CK
QA
A
B
C
QB
D
QC
P
T
QD
Ripple
CLR Carry
RL Load circuit 1
CL
QB
Same as Load Circuit 1.
QC
Same as Load Circuit 1.
QD
Same as Load Circuit 1.
Ripple
Carry
Same as Load Circuit 1.
Notes: 1. CL includes probe and jig capacitance.
2. All diodes are 1S2074(H).
Rev.2.00, Feb.18.2005, page 5 of 11
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