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SN74LS221 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. SN74LS221
Description  LOW POWER SCHOTTKY
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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SN74LS221
http://onsemi.com
5
AC CHARACTERISTICS (VCC = 5.0 V, TA = 25°C)
From
To
Limits
Symbol
From
(Input)
To
(Output)
Min
Typ
Max
Unit
Test Conditions
t
A
Q
45
70
ns
tPLH
B
Q
35
55
ns
t
A
Q
50
80
ns
C
=80 pFR
=20
tPHL
B
Q
40
65
ns
Cext = 80 pF, Rext = 2.0 Ω
tPHL
Clear
Q
35
55
ns
CL = 15 pF,
tPLH
Clear
Q
44
65
ns
L
See Figure 1
70
120
150
Cext = 80 pF, Rext = 2.0 Ω
t ()
AorB
QorQ
20
47
70
ns
Cext = 0, Rext = 2.0 kΩ
tW(out)
A or B
Q or Q
600
670
750
Cext = 100 pF, Rext = 10 kΩ
6.0
6.9
7.5
ms
Cext = 1.0 µF, Rext = 10 kΩ
AC SETUP REQUIREMENTS (VCC = 5.0 V, TA = 25°C)
Limits
Symbol
Parameter
Min
Typ
Max
Unit
Rate of Rise or Fall of Input Pulse
dv/dt
Schmitt, B
1.0
V/s
Logic Input, A
1.0
V/
µs
Input Pulse Width
tW
A or B, tW(in)
40
ns
W
Clear, tW (clear)
40
ts
Clear-Inactive-State Setup Time
15
ns
Rext
External Timing Resistance
1.4
100
k
Cext
External Timing Capacitance
0
1000
µF
Output Duty Cycle
RT = 2.0 k
50
%
RT = MAX Rext
90




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