SN54221, SN54LS221, SN74221, SN74LS221
DUAL MONOSTABLE MULTIVIBRATORS
WITH SCHMITT TRIGGER INPUTS
SDLS213B − DECEMBER 1983 − REVISED NOVEMBER 2004
switching characteristics V
CC
= 5 V, R
L
= 2 kΩ, T
A
= 25_C (see Figures 1 and 2)
PARAMETER
FROM
(INPUT)
A
tPLH
tPHL
tPHL
tPLH
B
A
B
CLR
Q
Q
Q
Cext = 80 pF,
Cext = 80 pF,
tw
A or B
Q or Q
Cext = 0,
Cext = 100 pF,
Cext = 1
µF,
Rext = 2 kΩ
Rext = 2 kΩ
Rext = 2 kΩ
Rext = 10 kΩ
Rext = 10 kΩ
70
20
670
6*
Q
Cext = 80 pF,
Rext = 2 kΩ
TO
(OUTPUT)
SN54LS221
TEST CONDITIONS
MIN
TYP
45
35
50
40
35
44
120
47
740
6.9
MAX
70
55
80
65
55
65
150
70
810
7.5*
70
20
670
6
SN74LS221
MIN
TYP
45
35
50
40
35
44
120
47
740
6.9
MAX
70
55
80
65
55
65
150
70
810
7.5
ms
ns
ns
ns
UNIT
∗
On products compliant to MIL-PRF-38535, this parameter is not production tested.
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