HEF4541BP データシートの表示（PDF） - NXP Semiconductors.
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HEF4541BP Datasheet PDF : 17 Pages
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HEF4541B
Programmable timer
Rev. 4 — 25 June 2012
Product data sheet
1. General description
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.
2. Features and benefits
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
3. Ordering information
Table 1. Ordering information
All types operate from −40 °C to +85 °C.
Type number Package
Name
Description
HEF4541BP
DIP14
plastic dual in-line package; 14 leads (300 mil)
HEF4541BT
SO14
plastic small outline package; 14 leads; body width 3.9 mm
Version
SOT27-1
SOT108-1
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