HEF4541BT: Programmable timer

The HEF4541B is a programmable timer which consists of a 16-stage binary counter, an integrated oscillator to be used with external timing components, an automatic power-on reset and output control logic. The frequency of the oscillator is determined by the external components RTC and CTC within the frequency range 1 Hz to 100 kHz. This oscillator may be replaced by an external clock signal at input RS, the timer advances on the positive-going transition of RS. A LOW on the auto reset input (AR) and a LOW on the master reset input (MR) enables the internal power-on reset. A HIGH level at input MR resets the counter independent on all other inputs. Resetting disables the oscillator to provide no active power dissipation.

A HIGH at input AR turns off the power-on reset to provide a low quiescent power dissipation of the timer. The 16-stage counter divides the oscillator frequency by 28, 210, 213 or 216 depending on the state of the address inputs (A0, A1). The divided oscillator frequency is available at output O. The phase input (PH) features a complementary output signal. When the mode select input (MODE) is LOW the timer is a single transition timer and when HIGH the timer is a 2n frequency divider.

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.

sot108-1_3d
Data Sheets (1)
Name/DescriptionModified Date
Programmable timer (REV 5.0) PDF (179.0 kB) HEF4541B [English]15 Dec 2015
Application Notes (1)
Name/DescriptionModified Date
Pin FMEA HEF4000 family (REV 2.0) PDF (30.0 kB) AN11051 [English]21 Aug 2015
Brochures (2)
Name/DescriptionModified 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/DescriptionModified Date
plastic small outline package; 14 leads; body width 3.9 mm (REV 1.0) PDF (166.0 kB) SOT108-1 [English]08 Feb 2016
Packing (1)
Name/DescriptionModified Date
SO14; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 4.0) PDF (207.0 kB) SOT108-1_118 [English]08 Apr 2013
Supporting Information (2)
Name/DescriptionModified 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
ProductStatusFamilyVCC (V)FunctionOutput drive capability (mA)DescriptionLogic switching levelsPackage versiontpd (ns)Power dissipation considerationsTamb (Cel)fmax (MHz)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package nameNo of pins
HEF4541BTActiveHEF4000B4.5 - 15.5Binary counters/timers- 4/ + 2.7programmable timerCMOSSOT108-138medium-40~85150531.010SO1414
Package Information
Product IDPackage DescriptionOutline VersionReflow/Wave SolderingPackingProduct StatusPart NumberOrdering code(12NC)MarkingChemical ContentRoHS / Pb Free / RHFLeadFree Conversion DateEFRIFR(FIT)MTBF(hour)MSLMSL LF
HEF4541BTSOT108-1SO-SOJ-REFLOW SO-SOJ-WAVE
SO-SOJ-REFLOW SO-SOJ-WAVE
Tube in DrypackActiveHEF4541BT,512 (9335 080 00512)HEF4541BTHEF4541BTAlways Pb-free75.32.993.34E813
Reel 13" Q1/T1 in DrypackActiveHEF4541BT,518 (9335 080 00518)HEF4541BTHEF4541BTAlways Pb-free75.32.993.34E813
Reel 13" Q1/T1 CECCWithdrawnHEF4541BT,653 (9335 080 00653)HEF4541BTHEF4541BTweek 35, 200475.32.993.34E811
Bulk Pack, CECCWithdrawnHEF4541BT,652 (9335 080 00652)HEF4541BTHEF4541BTweek 35, 200475.32.993.34E811
Programmable timer HEF4541BT
Pin FMEA HEF4000 family HEF4894B_Q100
電圧レベルシフタ 74AVC16245DGG-Q100
Voltage translation: How to manage mixed-voltage designs with NXP® level translators 74AVC16245DGG-Q100
SO14; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... 74LV164_Q100
plastic small outline package; 14 leads; body width 3.9 mm 74LV164_Q100
Footprint for reflow soldering NPIC6C596A_Q100
Footprint for wave soldering NPIC6C596A_Q100
UBA2213