IC Chips - 4541

4541
Programmable timer
PDF datasheet

Pin	Symbol	Description
1	R_TC	external resistor connection (R_t )
2	C_TC	external capacitor connection (C_t )
3	RS	external resistor connection (R_S ) or external clock input
4	NC	no connection
5	AR	auto reset input (active low)
6	MR	master reset input (active high)
7	GND	ground
8	O	output
9	PH	phase input
10	MODE	mode select (single cycle or continuous)
11	NC	no connection
12	A0	divider input
13	A1	divider input
14	Vcc	supply voltage

Specifications
(typical values under recommended operating conditions, unless specified)

Notes
The RC oscillator frequency is 1/(2.3 ×R_t × C_t ). R_S = 2R_t . An external clock signal, connected to RS, may be used instead. The timer advances on the low-to-high transition of RS. The input frequency is divided by a value determined by A1A0: 2¹³ (LL), 2¹⁰ (LH), 2⁸ (HL), or 2¹⁶ (HH). Power-on reset is enabled when AR and MR are low. For HEF4541, Vcc should be above 8.5V for correct power-on reset. PH specifies the state of the output after reset (high or low). When MODE is high, the output oscillates continuously. When MODE is low, the output changes only once, after a single cycle.

Notes

The RC oscillator frequency is 1/(2.3 ×R_t × C_t ). R_S = 2R_t .
An external clock signal, connected to RS, may be used instead. The timer advances on the low-to-high transition of RS.
The input frequency is divided by a value determined by A1A0: 2¹³ (LL), 2¹⁰ (LH), 2⁸ (HL), or 2¹⁶ (HH).
Power-on reset is enabled when AR and MR are low. For HEF4541, Vcc should be above 8.5V for correct power-on reset.
PH specifies the state of the output after reset (high or low).
When MODE is high, the output oscillates continuously.
When MODE is low, the output changes only once, after a single cycle.