SN54221, SN54LS221, SN74221, SN74LS221

DUAL MONOSTABLE MULTIVIBRATORS

WITH SCHMITT TRIGGER INPUTS

SDLS213B − DECEMBER 1983 − REVISED NOVEMBER 2004

13

POST OFFICE BOX 655303

Figure 3

Median

DISTRIBUTION OF UNITS

FOR

OUTPUT PULSE

tw − Output Pulse

VCC = 5 V

TA = 25°C

Median

+0.5%

Median

+0.5%

Figure 4

0

− 0.5

−1

4.5

4.75

5

0.5

VARIATION IN OUTPUT PULSE

vs

SUPPLY VOLTAGE

1

5.25

5.5

VCC − Supply Voltage − V

Cext = 60 pF

Rext = 10 kΩ

TA = 25°C

tw ≈ 420 ns

at VCC = 5 V

Figure 5

−25

−50

−75

0

− 0.5

−1

025

50

0.5

VARIATION IN OUTPUT PULSE

vs

FREE-AIR TEMPERATURE

1

75

100

125

TA − Free-Air Temperature − °C

VCC = 5 V

Cext = 60 pF

Rext = 10 kΩ

tw ≈ 420 ns

at TA = 25°C

OUTPUT PULSE

vs

TIMING RESISTOR VALUE

Figure 6

100 ns

10 ns

12

4

7 10

10 ms

1 ms

20

40

70 100

100

µs

10

µs

1

µs

VCC = 5 V

TA = 25°C

F

µ

Cext = 1

F

µ

Cext = 0.1

F

µ

Cext = 0.01

Cext = 1000 pF

Cext = 100 pF

Cext = 10 pF

See Note A

Rext − Timing Resistor Value − kΩ

† Data for temperatures below 0°C and above 70°C, and for supply voltages below 4.75 V and above 5.25 V are applicable for the SN54221 only.

NOTE A: These values of resistance exceed the maximum recommended for use over the full military temperature range of the SN54221.