FEATURES: AY-5-9151A

.

2.5V to 5V and 200μA operation, plus standby mode

Frequency of on-chip clock set by external RC network

Selectable break: make ratio and interdigital pause

Uses 3 x 4 matrix keyboard with no keyboard ground or

common contact

Keyboard inputs have antibounce protection

Input pull-up or pull-down resistors on-chip

Redial and access pause controlled from keyboard

22 digit capacity including access pauses

Dialer reset for line power breaks>200ms.

FEATURES: AY-5-9151B. Same as AY-5-9151A except:

18 Pin package

FEATURES: AY-5-9152. Same as AY-5-9151A except:

■ Break: Make fixed at 60:40 plus:

■ Two antiphase mask outputs for driving bistable relay

FEATURES: AY-5-9152/B. Same as AY-5-9152 except:

■18 Pin package

FEATURES: AY-5-9153A. Same as AY-5-9151A when in 3 x 4

matrix keyboard mode plus:

Π Pin selectable options of 1 of 12 keyboard, 2 of 7 keyboard

wired to produce 4-bit code with common

■8 bit output for displaying number in digit store

■Simple call-barring facility using display outputs

FEATURES: AY-5-9153B. Same as AY-5-9153A except:

■Keyboard is binary input with common

FEATURES: AY-5-9154A. Same as AY-5-9153A except:

Break: Make fixed at 60:40 plus:

Two antiphase mask outputs for driving bistable relay

DESCRIPTION

This range of CMOS Pushbutton Dialers consists of seven devices

AY-5-9151A to AY-5-9154A, all of which perform the function of

converting input data (e.g. from a keyboard) into a series of

pulses suitable for loop disconnect dialing. The series is based

on two devices: a simple, basic dialer circuit and a more complex

and versatile device which accepts a variety of data entry codes

and has a display facility.

The use of CMOS technology results in low voltage and current

requirements, enabling easy interfacing with a variety of

telephones. The versatility of the devices and the low external

component count enables the building of sophisticated, reliable

telephones at low cost.