HEC4538BT-T Datasheet, PDF(1/18 Page) NXP Semiconductors – Dual precision monostable multivibrator

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HEC4538BT-T Datasheet, PDF (1/18 Pages) NXP Semiconductors – Dual precision monostable multivibrator

HEF4538B

Dual precision monostable multivibrator

Rev. 8 â 16 November 2011

Product data sheet

1. General description

The HEF4538B is a dual retriggerable-resettable monostable multivibrator. Each

multivibrator has an active LOW trigger/retrigger input (nA), an active HIGH

trigger/retrigger input (nB), an overriding active LOW direct reset input (nCD), an output

(nQ) and its complement (nQ), and two pins (nREXT/CEXT, and nCEXT, always

connected to ground) for connecting the external timing components CEXT and REXT.

Typical pulse width variation over the specified temperature range is ï±0.2 %.

The multivibrator may be triggered by either the positive or the negative edges of the input

pulse and will produce an accurate output pulse with a pulse width range of 10 ïs to

infinity. The duration and accuracy of the output pulse are determined by the external

timing components CEXT and REXT. The output pulse width (tW) is equal to REXT ï´ CEXT.

The linear design techniques in LOCMOS (Local Oxide CMOS) guarantee precise control

of the output pulse width. A LOW level at nCD terminates the output pulse immediately.

The trigger inputsâ Schmitt trigger action makes the circuit highly tolerant of slower rise

and fall times.

It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS

(usually ground). Unused inputs must be connected to VDD, VSS, or another input.

2. Features and benefits

ï® Tolerant of slow trigger rise and fall times

ï® Fully static operation

ï® 5 V, 10 V, and 15 V parametric ratings

ï® Standardized symmetrical output characteristics

ï® Specified from ï40 ï°C to +85 ï°C and ï40 ï°C to +125 ï°C

ï® Complies with JEDEC standard JESD 13-B

3. Ordering information

Table 1. Ordering information

All types operate from ï40 ï°C to +125 ï°C.

Type number

Package

Name

Description

HEF4538BP

DIP16

plastic dual in-line package; 16 leads (300 mil)

HEF4538BT

SO16

plastic small outline package; 16 leads; body width 3.9 mm

Version

SOT38-4

SOT109-1

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