HD74LS161A Datasheet, PDF (4/11 Pages) Hitachi Semiconductor – Synchronous 4-bit Binary Counters(direct clear)

HD74LS161A
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Symbol min. typ.* max. Unit
Condition
Input voltage
Output voltage
Data, Enable P
V_IH
2.0
—
—
V
V_IL
—
—
0.8
V
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}
—
—
20
Load, Clock, Enable T
I_IH
Clear
—
—
40
µA V_CC = 5.25 V, V_I = 2.7 V
—
—
20
Data, Enable P
Input
current ^{Load, Clock, Enable T}
I_IL
Clear
—
— –0.4
—
— –0.8 mA VCC = 5.25 V, VI = 0.4 V
—
–0.4
Data, Enable P
—
—
0.1
Load, Clock, Enable T
I_I
Clear
—
—
0.2
mA V_CC = 5.25 V, V_I = 7 V
—
—
0.1
Short-circuit output current
I_OS
–20
— –100 mA V_CC = 5.25 V
Supply current**
I_CCH
—
18
31
mA V_CC = 5.25 V
I_CCL
—
19
32
mA V_CC = 5.25 V
Input clamp voltage
V_IK
—
—
–1.5
V V_CC = 4.75 V, I_IN = –18 mA
Notes: * V_CC = 5 V, Ta = 25°C
** I_CCH is measured with the load input high, then again with the load input low, with all other inputs high and all
outputs open. I_CCL is measured with the clock input high, then again with the clock input low, with all other
inputs low and all outputs open.
Switching Characteristics
(V_CC = 5 V, Ta = 25°C)
Item
Symbol
Inputs
Outputs min. typ. max. Unit Condition
Maximum clock frequency
ƒ_max
Clock
Q_A to Q_D
25
32
—
MHz
t_PLH
Clock
Ripple
—
20
35
ns
t_PHL
Carry
—
18
35
ns
Propagation delay time
t_PLH
t_PHL
Clock
(Load = “H”) ^{QA to QD}
—
—
13
18
24
27
ns
ns C_L = 15 pF,
t_PLH
t_PHL
Clock
(Load = “L”) ^{QA to QD}
—
—
13
18
24
27
ns ^RL ^{= 2 kΩ}
ns
t_PLH
Enable T
Ripple
—
9
14
ns
t_PHL
Carry
—
9
14
ns
t_PHL
Clear
Q_A to Q_D
—
20
28
ns
Rev.2.00, Feb.18.2005, page 4 of 10