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.
sot108-1_3d
Data Sheets (1)
| Name/Description | Modified Date |
|---|
| Programmable timer (REV 5.0) PDF (179.0 kB) HEF4541B [English] | 15 Dec 2015 |
Application Notes (1)
Brochures (2)
Package Information (1)
Packing (1)
Supporting Information (2)
Ordering Information
| Product | Status |
|---|
| HEF4541BT | Active |
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 |
|---|
| HEF4541BT | | SOT108-1 | SO-SOJ-REFLOW
SO-SOJ-WAVE
SO-SOJ-REFLOW
SO-SOJ-WAVE | Tube in Drypack | Active | HEF4541BT,512
(9335 080 00512) | HEF4541BT | HEF4541BT |    | Always Pb-free | 75.3 | 2.99 | 3.34E8 | 1 | 3 |
| Reel 13" Q1/T1 in Drypack | Active | HEF4541BT,518
(9335 080 00518) | HEF4541BT | HEF4541BT | | Always Pb-free | 75.3 | 2.99 | 3.34E8 | 1 | 3 |
| Reel 13" Q1/T1 CECC | Withdrawn | HEF4541BT,653
(9335 080 00653) | HEF4541BT | HEF4541BT | | week 35, 2004 | 75.3 | 2.99 | 3.34E8 | 1 | 1 |
| Bulk Pack, CECC | Withdrawn | HEF4541BT,652
(9335 080 00652) | HEF4541BT | HEF4541BT | | week 35, 2004 | 75.3 | 2.99 | 3.34E8 | 1 | 1 |
