MOTOROLA CMOS LOGIC DATA

1

MC14538B

Dual Precision

Retriggerable/Resettable

Monostable Multivibrator

The MC14538B is a dual, retriggerable, resettable monostable multivibra-

tor. It may be triggered from either edge of an input pulse, and produces an

accurate output pulse over a wide range of widths, the duration and accuracy

of which are determined by the external timing components, CX and RX.

• Unlimited Rise and Fall Time Allowed on the A Trigger Input

• Pulse Width Range = 10 µs to 10 s

• Latched Trigger Inputs

• Separate Latched Reset Inputs

• 3.0 Vdc to 18 Vdc Operational Limits

• Triggerable from Positive (A Input) or Negative–Going Edge (B–Input)

• Capable of Driving Two Low–power TTL Loads or One Low–power

Schottky TTL Load Over the Rated Temperature Range

• Pin–for–pin Compatible with MC14528B and CD4528B (CD4098)

• Use the MC54/74HC4538A for Pulse Widths Less Than 10 µs with

Supplies Up to 6 V.

Symbol

Parameter

Value

Unit

VDD

DC Supply Voltage

– 0.5 to + 18.0

V

Vin, Vout Input or Output Voltage (DC or Transient)

– 0.5 to VDD + 0.5

V

Iin, Iout

Input or Output Current (DC or Transient),

per Pin

± 10

mA

PD

Power Dissipation, per Package†

500

mW

Tstg

Storage Temperature

– 65 to + 150

_C

TL

Lead Temperature (8–Second Soldering)

260

_C

* Maximum Ratings are those values beyond which damage to the device may occur.

†Temperature Derating:

Plastic “P and D/DW” Packages: – 7.0 mW/

_C From 65_C To 125_C

Ceramic “L” Packages: – 12 mW/

_C From 100_C To 125_C

ONE–SHOT SELECTION GUIDE

100 ns

MC14528B

MC14536B

MC14538B

MC14541B

MC4538A*

1

µs

10

µs 100 µs

1 ms

10 ms

100 ms

1 s

10 s

*LIMITED OPERATING VOLTAGE (2 – 6 V)

TOTAL OUTPUT PULSE WIDTH RANGE

RECOMMENDED PULSE WIDTH RANGE

23 HR

5 MIN.

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

REV 3

1/94

MC14538B

L SUFFIX

CERAMIC

CASE 620

ORDERING INFORMATION

MC14XXXBCP

Plastic

MC14XXXBCL

Ceramic

*MC14XXXBDW

SOIC

TA = – 55° to 125°C for all packages.

P SUFFIX

PLASTIC

CASE 648

DW SUFFIX

SOIC

CASE 751G

BLOCK DIAGRAM

* Consult factory for possible “D” suffix SOIC

Case 751B.

VDD

VDD

6

7

10

9

12

11

5

4

A

B

CX

RX

1

2

Q1

Q1

RESET

3

CX

RX

15

14

Q2

Q2

RESET

13

A

B

RX AND CX ARE EXTERNAL COMPONENTS.

VDD = PIN 16

VSS = PIN 8, PIN 1, PIN 15