Nexperia

HEF4538B

Dual precision monostable multivibrator

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(1)

(3)

(5)

(4)

(1)

(2)

(1)

Vref1

T

Vref2

Vref2

Vref1

T

T

nA input

nB input

nCD input

nREXT/CEXT input

nQ output

(1) Positive edge triggering.

(2) Positive edge re-triggering (pulse lengthening).

(3) Negative edge triggering.

(4) Reset (pulse shortening).

(5) T = REXT × CEXT.

Fig. 4. Timing diagram

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nCD

nA

nB

nCEXT

VDD

nREXT/CEXT

REXT

CEXT

nQ

nQ

T

T = REXT × CEXT

Fig. 5. Connection of the external timing components REXT and CEXT

7. Limiting values

Table 4. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to VSS = 0 V (ground)

Symbol

Parameter

Conditions

Min

Max

Unit

VDD

supply voltage

-0.5

+18

V

IIK

input clamping current

VI < -0.5 V or VI > VDD + 0.5 V

-

±10

mA

VI

input voltage

-0.5

VDD + 0.5 V

IOK

output clamping current

VI < -0.5 V or VI > VDD + 0.5 V

-

±10

mA

II/O

input/output current

-

±10

mA

IDD

supply current

-

50

mA

Tstg

storage temperature

-65

+150

°C

Tamb

ambient temperature

-40

+125

°C

Ptot

total power dissipation

Tamb = -40 °C to +125 °C

[1]

-

500

mW

P

power dissipation

per output

-

100

mW

[1] For SOT109-1 (SO16) package: Ptot derates linearly with 12.4 mW/K above 110 °C.

HEF4538B

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© Nexperia B.V. 2022. All rights reserved

Product data sheet

Rev. 12 — 4 March 2022

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