HD74LS85 Datasheet, PDF (3/7 Pages) Hitachi Semiconductor – 4-bit Magnitude Comparators

HD74LS85
Recommended Operating Conditions
Item
Supply voltage
Output current
Operating temperature
Symbol
V_CC
I_OH
I_OL
Topr
Min
4.75
—
—
–20
Typ
5.00
—
—
25
Max
5.25
–400
8
75
Unit
V
µA
mA
°C
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Symbol min. typ.* max. Unit
Condition
Input voltage
V_IH
2.0
—
—
V
V_IL
—
—
0.8
V
Output voltage
V_OH
2.7
—
—
V
V_CC = 4.75 V, V_IH = 2 V, V_IL = 0.8 V,
I_OH = –400 µA
V_OL
—
—
0.4
V
I_OL = 4 mA V_CC = 4.75 V, V_IH = 2 V,
—
—
0.5
I_OL = 8 mA ^VIL ^{= 0.8 V}
A < B, A > B
inputs
I_IH
—
—
20
µA V_CC = 5.25 V, V_I = 2.7 V
Other inputs
—
—
60
A < B, A > B
Input
current
inputs
I_IL
Other inputs
—
—
–0.4
mA V_CC = 5.25 V, V_I = 0.4 V
—
—
–1.2
A < B, A > B
inputs
I_I
Other inputs
—
—
0.1
mA V_CC = 5.25 V, V_I = 7 V
—
—
0.3
Short-circuit output
current
I_OS
–20
—
–100
mA V_CC = 5.25 V
Supply current**
I_CC
—
10.4
20
mA V_CC = 5.25 V
Input clamp voltage
V_IK
—
—
–1.5
V
V_CC = 4.75 V, I_IN = –18 mA
Note: * V_CC = 5 V, Ta = 25°C
** I_CC is measured with outputs open, A = B grounded, and all other inputs at 4.5 V.
Switching Characteristics
(V_CC = 5 V, Ta = 25°C)
Item
Symbol Inputs
Outputs Number of min. typ. max. Unit Condition
gate levels
1
—
14
—
Any A or A < B, A > B
2
t_PLH
B data input
3
—
19
—
—
24
36
A=B
4
—
27
45
1
—
11
—
Any A or A < B, A > B
2
Propagation
t_PHL
B data input
3
delay time
A=B
4
—
15
—
—
—
20
23
30
45
ns
C_L = 15 pF,
R_L = 2 kΩ
t_PHL
A < B or
t_PHL
A=B
A>B
1
—
14
22
1
—
11
17
t_PLH
A=B
t_PHL
A=B
2
—
13
20
2
—
13
26
t_PLH
A > B or
t_PHL
A=B
A<B
1
—
14
22
1
—
11
17
Rev.2.00, Feb.18.2005, page 3 of 6