74LS221 View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
MFG CO.
74LS221 Datasheet PDF : 8 Pages
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Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
Input Clamp Voltage
VCC = Min, II = −18 mA
VOH
HIGH Level
Output Voltage
VCC = Min, IOH = Max
2.7
VIL = Max, VIH = Min
VOL
LOW Level
VCC = Min, IOL = Max
Output Voltage
VIL = Max, VIH = Min
VCC = Min, IOL = 4 mA
II
Input Current @ Max Input Voltage
VCC = Max, VI = 7V
IIH
HIGH Level Input Current
VCC = Max, VI = 2.7V
IIL
LOW Level
VCC = Max
A1, A2
Input Current
VI = 0.4V
B
Clear
IOS
Short Circuit
VCC = Max
−20
Output Current
(Note 6)
ICC
Supply Current
VCC = Max
Quiescent
Triggered
Note 5: All typicals are at VCC = 5V, TA = 25°C.
Note 6: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol
Parameter
tPLH
tPLH
tPHL
tPHL
tPLH
tPHL
tW(out)
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Output Pulse
Width Using Zero
Timing Capacitance
tW(out)
Output Pulse
Width Using External
Timing Resistor
From (Input)
To (Output)
A1, A2
to Q
B
to Q
A1, A2
to Q
B
to Q
Clear to
Q
Clear
to Q
A1, A2
to Q, Q
A1, A2
to Q, Q
Conditions
CEXT = 80 pF
REXT = 2 kΩ
CL = 15 pF
RL = 2 kΩ
CEXT = 0
REXT = 2 kΩ
RL = 2 kΩ
CL = 15 pF
CEXT = 100 pF
REXT = 10 kΩ
RL = 2 kΩ
CL = 15 pF
CEXT = 1 µF
REXT = 10 kΩ
RL = 2 kΩ
CL = 15 pF
CEXT = 80 pF
REXT = 2 kΩ
RL = 2 kΩ
CL = 15 pF
Typ
(Note 5)
3.4
0.35
4.7
19
Max
−1.5
0.5
0.4
0.1
20
−0.4
−0.8
−0.8
−100
11
27
Min
Max
70
55
80
65
65
55
20
70
600
750
6
7.5
70
150
Units
V
V
V
mA
µA
mA
mA
mA
Units
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
5
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