HD74LS192
Testing Method
Test Circuit
V
CC
Output
4.5V
Borrow
C
L
Up
Input
Down
Output
Carry
A
B
C
D
Load
Clear
Q
B
Output
Q
C
Output
Q
D
Same as Load Circuit 1.
Same as Load Circuit 1.
Q
A
Output
Same as Load Circuit 1.
Output
Same as Load Circuit 1.
Same as Load Circuit 1.
R
L
Load circuit 1
P.G.
Z
out
= 50Ω
Notes:
1. C
L
includes probe and jig capacitance.
2. All diodes are 1S2074(H).
Testing Table
Item
ƒ
max
Up Count
Down Count
Load→Q
Clear→Q
From input to output
CLR
GND
GND
GND
GND
GND
IN
Load
4.5V
4.5V
4.5V
4.5V
IN
IN*
Up
IN
4.5V
IN
4.5V
GND
GND
Inputs
Down
A
4.5V
GND
IN
GND
4.5V
GND
IN
GND
GND
IN
GND
4.5V
B
GND
GND
GND
GND
IN
4.5V
C
GND
GND
GND
GND
IN
4.5V
D
GND
GND
GND
GND
IN
4.5V
t
PLH
t
PHL
Note: *. For initialized
Outputs
Q
A
OUT
Up Count
Down Count
Load→Q
Clear→Q
OUT
OUT
OUT
OUT
OUT
Q
B
OUT
OUT
OUT
OUT
OUT
OUT
Q
C
OUT
OUT
OUT
OUT
OUT
OUT
Q
D
OUT
OUT
OUT
OUT
OUT
OUT
Carry
OUT
—
OUT
—
—
—
Borrow
—
OUT
—
OUT
—
—
Item
ƒ
max
From input to output
t
PLH
t
PHL
Rev.2.00, Feb.18.2005, page 6 of 10
See Waveforms
RENESAS [ RENESAS TECHNOLOGY CORP ]
