HD74LS85 Datasheet, PDF (4/7 Pages) Hitachi Semiconductor – 4-bit Magnitude Comparators

HD74LS85
Testing Method
Test Circuit
4.5V
V_CC Output
P.G.
Zout = 50Ω
Input
A3
RL ^{Load circuit 1}
B3
A>B
A2
B2
CL
A1
B1
Output
A0
B0
A=B
Same as Load Circuit 1.
Output
A<B
A<B
A=B
A>B
Same as Load Circuit 1.
Notes: 1. C_L includes probe and jig capacitance.
2. All diodes are 1S2074(H).
Waveform
t_TLH
t_THL
90%
90%
3V
Input
1.3 V
1.3 V
10%
10%
0V
t_PLH
t_PHL
In phase output
(A)
1.3 V
t_PHL
1.3 V
t_PLH
V_OH
V_OL
Out of phase output
(B)
1.3 V
1.3 V
V_OH
V_OL
Note: Input pulse; t_TLH ≤ 15 ns, t_THL ≤ 6 ns, PRR = 1 MHz, duty cycle = 50%
Rev.2.00, Feb.18.2005, page 4 of 6