HEF4538B: Dual precision monostable multivibrator (Based on PIP HEF4538B)

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 μs 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.

HEF4538B: Product Block Diagram

sot109-1_3d

Data Sheets (1)

Name/Description	Modified Date
Dual precision monostable multivibrator (REV 10.0) PDF (179.0 kB) HEF4538B [English]	01 Apr 2016

Application Notes (1)

Name/Description	Modified Date
Pin FMEA HEF4000 family (REV 2.0) PDF (30.0 kB) AN11051 [English]	21 Aug 2015

Brochures (2)

Name/Description	Modified Date
電圧レベルシフタ (REV 1.1) PDF (3.1 MB) 75017511_JP [English]	16 Feb 2015
Voltage translation: How to manage mixed-voltage designs with NXP® level translators (REV 1.0) PDF (2.6 MB) 75017511 [English]	20 May 2014

Package Information (1)

Name/Description	Modified Date
plastic small outline package; 16 leads; body width 3.9 mm (REV 1.0) PDF (192.0 kB) SOT109-1 [English]	08 Feb 2016

Packing (1)

Name/Description	Modified Date
SO16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 4.0) PDF (210.0 kB) SOT109-1_118 [English]	24 Apr 2013

Supporting Information (2)

Name/Description	Modified Date
Footprint for reflow soldering (REV 1.0) PDF (9.0 kB) SO-SOJ-REFLOW [English]	08 Oct 2009
Footprint for wave soldering (REV 1.0) PDF (8.0 kB) SO-SOJ-WAVE [English]	08 Oct 2009

Ordering Information

Product	Status
HEF4538BT	Active

Package Information

Product ID	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	LeadFree Conversion Date	EFR	IFR(FIT)	MTBF(hour)	MSL	MSL LF
HEF4538BT	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1 CECC	Active	HEF4538BT,653 (9335 079 70653)	HEF4538BT	HEF4538BT	week 12, 2005	75.3	2.99	3.34E8	1	1
HEF4538BT	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Bulk Pack, CECC	Active	HEF4538BT,652 (9335 079 70652)	HEF4538BT	HEF4538BT	week 12, 2005	75.3	2.99	3.34E8	1	1
HEF4538BT/S242	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1	Withdrawn	HEF4538BT/S242,118 (9350 149 80118)	Standard Marking			75.3	2.99	3.34E8	1	1