Nexperia

HEF4538B

Dual precision monostable multivibrator

Table 7. Typical static characteristics

VSS = 0 V; VI = VSS or VDD; Tamb = 25 °C.

Symbol

Parameter

Conditions

VDD

Typ

Unit

5 V

[1]

55

μA

10 V

150

μA

IDD

supply current

active state

15 V

220

μA

CI

input capacitance

nREXT/CEXT

-

15

pF

[1] Only one monostable is switching: for the specified current during the output pulse (output nQ is HIGH).

10. Dynamic characteristics

Table 8. Dynamic characteristics

VSS = 0 V; Tamb = 25 °C; for test circuit see Fig. 11.

Symbol Parameter

Conditions

VDD

Extrapolation formula[1] Min

Typ

Max Unit

5 V

193 ns + (0.55 ns/pF) CL

-

220

440

ns

10 V

74 ns + (0.23 ns/pF) CL

-

85

190

ns

nA, nB to nQ; see Fig. 6

15 V

52 ns + (0.16 ns/pF) CL

-

60

120

ns

5 V

98 ns + (0.55 ns/pF) CL

-

125

250

ns

10 V

44 ns + (0.23 ns/pF) CL

-

55

110

ns

tPHL

HIGH to LOW

propagation

delay

nCD to nQ; see Fig. 6

15 V

32 ns + (0.16 ns/pF) CL

-

40

80

ns

5 V

173 ns + (0.55 ns/pF) CL

-

200

460

ns

10 V

79 ns + (0.23 ns/pF) CL

-

90

180

ns

nA, nB to nQ; see Fig. 6

15 V

52 ns + (0.16 ns/pF) CL

-

60

120

ns

5 V

98 ns + (0.55 ns/pF) CL

-

125

250

ns

10 V

44 ns + (0.23 ns/pF) CL

-

55

110

ns

tPLH

LOW to HIGH

propagation

delay

nCD to nQ; see Fig. 6

15 V

32 ns + (0.16 ns/pF) CL

-

40

80

ns

5 V

[2] 10 ns + (1.00 ns/pF) CL

-

60

120

ns

10 V

9 ns + (0.42 ns/pF) CL

-

30

60

ns

tt

transition time

see Fig. 6

15 V

6 ns + (0.28 ns/pF) CL

-

20

40

ns

5 V

-

20

40

ns

10 V

-

10

20

ns

trec

recovery time

nCD to nA, nB; see Fig. 7

15 V

-

5

10

ns

5 V

0

-

-

ns

10 V

0

-

-

ns

trtrig

retrigger time

nQ, nQ to nA, nB;

see Fig. 7

15 V

0

-

-

ns

HEF4538B

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© Nexperia B.V. 2022. All rights reserved

Product data sheet

Rev. 12 — 4 March 2022

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