HD74LS123 Datasheet, PDF (6/9 Pages) Hitachi Semiconductor – Dual Retriggerable Monostable Multivibrators(with Clear)

HD74LS123
Testing Method
Test Circuit
A1 Input
P.G.
Zout = 50Ω
B1 Input
P.G.
Zout = 50Ω
CLR Input
P.G.
Zout = 50Ω
V_CC Output Q
Rext
Cext _/Cext
Cext Rext V_CC
/Cext
Q
CL
RL ^{Load circuit 1}
CLR
Output Q
Q
Same as Load Circuit 1.
Notes: 1. C_L includes probe and jig capacitance.
2. All diodes are 1S2074(H).
Waveform
tw (in)
≥ 40ns
3V
A
1.3V 1.3V
1.3V
tw (in)
≥ 40ns
B
0V
tw (in)
3V
≥ 40ns
1.3V 1.3V
1.3V
tw (in)
0V
≥ 40ns
tw (CLR)
≥ 40ns
3V
Clear
1.3V
1.3V
0V
tPLH
tPLH
V_OH
Q
1.3V
1.3V
1.3V
1.3V
tPHL
tw (out)
V_OL
tPLH
Q
1.3V
1.3V
tPHL
Note: Input pulse; t_TLH ≤ 15 ns, t_THL ≤ 6 ns.
tw (out)
1.3V
tPHL
1.3V
V_OH
V_OL
Rev.2.00, Feb.18.2005, page 6 of 8