HEF4538B View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
HEF4538B Datasheet PDF : 18 Pages
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HEF4538B
Dual precision monostable multivibrator
Rev. 8 — 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 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 s 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 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 inputs’ 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
Tolerant of slow trigger rise and fall times
Fully static operation
5 V, 10 V, and 15 V parametric ratings
Standardized symmetrical output characteristics
Specified from 40 C to +85 C and 40 C to +125 C
Complies with JEDEC standard JESD 13-B
3. Ordering information
Table 1. Ordering information
All types operate from 40 C to +125 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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