74HC4538D: Dual retriggerable precision monostable multivibrator

The 74HC4538; 74HCT4538 is a dual retriggerable-resettable monostable multivibrator. Each multivibrator has two trigger/retrigger inputs (nA and nB), a direct reset input (nCD), two complementary outputs (nQ and nQ), and two pins (nREXT/CEXT and nCEXT) for connecting the external timing components CEXT and REXT. Typical pulse width variation over temperature range is ± 0.2%. The device may be triggered by either the positive or the negative edges of the input pulse. The duration and accuracy of the output pulse are determined by the external timing components CEXT and REXT. The output pulse width (T) is equal to 0.7 × REXT × CEXT. The linear design techniques guarantee precise control of the output pulse width. A LOW level at nCD terminates the output pulse immediately. Schmitt-trigger action in the trigger inputs makes the circuit highly tolerant to slower rise and fall times. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

74HC4538D: Product Block Diagram

sot109-1_3d

Data Sheets (1)

Name/Description	Modified Date
Dual retriggerable precision monostable multivibrator (REV 4.0) PDF (254.0 kB) 74HC_HCT4538 [English]	24 Feb 2016

Application Notes (2)

Name/Description	Modified Date
Live Insertion Aspects of Philips Logic Families (REV 1.0) PDF (73.0 kB) AN252 [English]	13 Mar 2013
Pin FMEA 74HC/74HCT family (REV 1.0) PDF (51.0 kB) AN11044 [English]	16 Mar 2011

Users Guides (1)

Name/Description	Modified Date
HC/T User Guide (REV 1.0) PDF (508.0 kB) HCT_USER_GUIDE [English]	01 Nov 1997

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

SPICE model

hc Spice model (REV 1.0) ZIP HC 5/7/2013

Ordering Information

Product	Status	Family	Function	V_CC (V)	Description	Logic switching levels	Package version	Output drive capability (mA)	t_pd (ns)	Power dissipation considerations	T_amb (Cel)	R_th(j-a) (K/W)	Ψ_th(j-top) (K/W)	R_th(j-c) (K/W)	Package name	No of pins
74HC4538D	Active	HC(T)	Multivibrators	2.0 - 6.0	dual retriggerable precision monostable multivibrator	CMOS	SOT109-1	+/- 5.2	27	low	-40~125	77	2.5	35	SO16	16
74HC4538D/DG	No Longer Manufactured			2.0 - 6.0		CMOS		+/- 5.2	27	low	-40~125	77	2.5	35	SO16

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	EFR	IFR(FIT)	MTBF(hour)	MSL	MSL LF
74HC4538D		SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1 CECC	Active	74HC4538D,653 (9337 149 10653)	74HC4538D	74HC4538D		week 12, 2005	84.9	6.62	1.51E8	1	1
74HC4538D		SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Bulk Pack, CECC	Active	74HC4538D,652 (9337 149 10652)	74HC4538D	74HC4538D		week 12, 2005	84.9	6.62	1.51E8	1	1