HEF4541B

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.

Features

  • Fully static operation
  • 5 V, 10 V, and 15 V parametric ratings
  • Standardized symmetrical output characteristics
  • Operates across the automotive temperature range −40 °C to +85 °C
  • Complies with JEDEC standard JESD 13-B

Parametrics

Type numberProduct statusVCC (V)Output drive capability (mA)Logic switching levelstpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
HEF4541BTProduction4.5 - 15.5- 4/ + 2.7CMOS38medium-40~85531.010SO14

Package

Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
HEF4541BT
SO14
(SOT108-1)
SOT108-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Tube in DrypackActiveHEF4541BTHEF4541BT,512
( 9335 080 00512 )
Reel 13" Q1/T1 in DrypackActiveHEF4541BTHEF4541BT,518
( 9335 080 00518 )

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
HEF4541BT
SO14
(SOT108-1)
SOT108-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCWithdrawn / End-of-lifeHEF4541BTHEF4541BT,653
( 9335 080 00653 )
Bulk Pack, CECCWithdrawn / End-of-lifeHEF4541BTHEF4541BT,652
( 9335 080 00652 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments
HEF4541BT933508000653
HEF4541BT933508000652
HEF4541BT933508000118
HEF4541BT933508000112

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
HEF4541BTHEF4541BT,512HEF4541BTAlways Pb-free75.32.993.34E813
HEF4541BTHEF4541BT,518HEF4541BTAlways Pb-free75.32.993.34E813

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
HEF4541BTHEF4541BT,653HEF4541BTweek 35, 200475.32.993.34E811
HEF4541BTHEF4541BT,652HEF4541BTweek 35, 200475.32.993.34E811
Quality and reliability disclaimer

Documentation (7)

File nameTitleTypeDate
HEF4541BProgrammable timerData sheet2017-07-20
AN11051Pin FMEA HEF4000 familyApplication note2019-01-09
SOT108-1_431SO14; Reel sulfur barrier pack, SMD, 13" Q1/T1 standard product orientation Orderable part number ending ,431 or Z Ordering code (12NC) ending 431Packing2016-11-24
SOT108-1_118SO14; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packing2013-04-08
SOT108-1plastic, small outline package; 14 leads; 1.27 mm pitch; 8.65 mm x 3.9 mm x 1.75 mm bodyOutline drawing2018-10-18
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08

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