CD4541

Programmable Timer

General Description

The CD4541BC Programmable Timer is designed with a

16-stage binary counter, an integrated oscillator for use

with an external capacitor and two resistors, output control

logic, and a special power-on reset circuit. The special fea-

tures of the power-on reset circuit are first, no additional

static power consumption and second, the part functions

across the full voltage range (3V–15V) whether power-on

reset is enabled or disabled.

Timing and the counter are initialized by turning on power,

if the power-on reset is enabled. When the power is

already on, an external reset pulse will also initialize the

timing and counter. After either reset is accomplished, the

oscillator frequency is determined by the external RC net-

work. The 16-stage counter divides the oscillator frequency

by any of 4 digitally controlled division ratios.

Features

s Available division ratios 28, 210, 213, or 216

s Increments on positive edge clock transitions

s Built-in low power RC oscillator (

±2% accuracy over

temperature range and

±10% supply and ±3% over pro-

cessing @

< 10 kHz)

s Oscillator frequency range

≈ DC to 100 kHz

s Oscillator may be bypassed if external clock is available

(apply external clock to pin 3)

s Automatic reset initializes all counters when power turns

on

s External master reset totally independent of automatic

reset operation

s Operates at 2n frequency divider or single transition

timer

s Q/Q select provides output logic level flexibility

s Reset (auto or master) disables oscillator during reset-

ting to provide no active power dissipation

s Clock conditioning circuit permits operation with very

slow clock rise and fall times

s Wide supply voltage range—3.0V to 15V

s High noise immunity—0.45 VDD (typ.)

s 5V–10V–15V parameter ratings

s Symmetrical output characteristics

s Maximum input leakage 1

µA at 15V over full tempera-

ture range

s High output drive (pin 8) min. one TTL load

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

N.C.—Not connected

Top View

Order Number

Package Number

Package Description

CD4541BCM

M14A

14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

CD4541BCN

N14A

14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

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