HD74LS191 Datasheet, PDF (4/11 Pages) Hitachi Semiconductor – Synchronous Up/Down 4-bit Binary Counters(single clock line)

HD74LS191
Recommended Operating Conditions
Item
Supply voltage
Output current
Operating temperature
Clock frequency
Clock pulse width
Load pulse width
Setup time
Hold time
Enable time
Symbol
V_CC
I_OH
I_OL
T_opr
ƒ_clock
t_{w (CK)}
t_{w (Load)}
t_su
t_{h (data)}
t_enable
Min
4.75
—
—
–20
0
25
35
20
3
40
Typ
5.00
—
—
25
—
—
—
—
—
—
Max
5.25
–400
8
75
20
—
—
—
—
—
Unit
V
µA
mA
°C
MHz
ns
ns
ns
ns
ns
Electrical Characteristics
Item
Symbol
min.
typ.* max.
Unit
Input voltage
V_IH
2.0
—
—
V
V_IL
—
—
0.8
V
V_OH
2.7
—
—
V
Output voltage
—
—
0.4
V_OL
V
—
—
0.5
Enable
—
—
60
Others
I_IH
µA
—
—
20
Input
Enable
—
—
–1.2
current _Others
I_IL
mA
—
—
–0.4
Enable
—
—
0.3
Others
I_I
mA
—
—
0.1
Short-circuit output
current
I_OS
–20
—
–100
mA
Supply current**
I_CC
—
20
35
mA
Input clamp voltage
V_IK
—
—
–1.5
V
Notes: * V_CC = 5 V, Ta = 25°C
** I_CC is measured with all outputs open and all inputs grounded.
(Ta = –20 to +75 °C)
Condition
V_CC = 4.75 V, V_IH = 2 V, V_IL = 0.8 V,
I_OH = –400 µΑ
I_OL = 4 mA V_CC = 4.75 V, V_IH = 2 V,
I_OL = 8 mA ^VIL ^{= 0.8 V}
V_CC = 5.25 V, V_I = 2.7 V
V_CC = 5.25 V, V_I = 0.4 V
V_CC = 5.25 V, V_I = 7 V
V_CC = 5.25 V
V_CC = 5.25 V
V_CC = 4.75 V, I_IN = –18 mA
Rev.2.00, Feb.18.2005, page 4 of 10