1997 Apr 16

3

Philips Semiconductors

Product specification

8-bit microcontrollers with DTMF generator,

8 kbytes OTP and 128 bytes EEPROM

PCD3755A; PCD3755E;

PCD3755F

1

FEATURES

• 8-bit CPU, ROM, RAM, EEPROM and I/O; in a single

28-lead or 32-lead package

• 8 kbytes user-programmable ROM (One-Time

Programmable)

• 128 bytes RAM

• 128 bytes Electrically Erasable Programmable

Read-Only Memory (EEPROM)

• Over 100 instructions (based on MAB8048) all of 1 or 2

cycles

• 20 quasi-bidirectional I/O port lines

• 8-bit programmable Timer/event counter 1

• 8-bit reloadable Timer 2

• Three single-level vectored interrupts:

– external

– 8-bit programmable Timer/event counter 1

– derivative; triggered by reloadable Timer 2

• Two test inputs, one of which also serves as the external

interrupt input

• DTMF, modem, musical tone generator

• Reference for supply and temperature-independent

tone output

• Filtering for low output distortion (CEPT compatible)

• Melody output for ringer application

• Power-on-reset

• Stop and Idle modes

• Supply voltage: 1.8 to 6 V (DTMF tone output and

EEPROM erase/write from 2.5 V)

• Clock frequency: 1 to 16 MHz (3.58 MHz for DTMF

suggested)

• Operating temperature: −25 to +70 °C

• Manufactured in silicon gate CMOS process.

2

GENERAL DESCRIPTION

This data sheet details the specific properties of the

PCD3755A, PCD3755E and PCD3755F. The devices

differ in their Port and Power-on-reset configurations.

References to ‘PCD3755x’ apply to all three types.

The devices are members of the PCD33xxA family of

microcontrollers.

The shared properties of the family are described in the

“PCD33xxA family” data sheet, which should be read in

conjunction with this publication.

The PCD3755A, PCD3755E and PCD3755F are

One-Time Programmable (OTP) microcontrollers

designed primarily for telephony applications.They include

an on-chip generator for dual tone multifrequency (DTMF),

modem and musical tones. In addition to dialling,

generated frequencies can be made available as square

waves (P1.7/MDY) for melody generation, providing ringer

operation.

The PCD3755A, PCD3755E and PCD3755F also

incorporate 128 bytes of EEPROM. The EEPROM can be

used for storing telephone numbers, particularly for

implementing redial functions.

The Power-on-reset circuitry is extra accurate to

accommodate parallel telephones and fax equipment.

The instruction set is similar to that of the MAB8048 and is

a sub-set of that listed in the

“PCD33xxA family” data

sheet.

3

ORDERING INFORMATION (see note 1)

Note

1. Please refer to the Order Entry Form (OEF) for this device for the full type number to use when ordering. This type

number will also specify the required program and the ROM mask options.

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCD3755xP

DIP28

plastic dual in-line package; 28 leads (600 mil)

SOT117-1

PCD3755xT

SO28

plastic small outline package; 28 leads; body width 7.5 mm

SOT136-1

PCD3755xH

LQFP32

plastic low profile quad flat package; 32 leads; body 7

× 7 × 1.4 mm

SOT358-1