MC145444 Datasheet, PDF (1/12 Pages) Motorola, Inc – Single-Chip 300-Baud Modem

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Advance Information
Single-Chip 300-Baud Modem
MC145444 is a silicon gate CMOS frequency shift keying (FSK) modem
intended for use with telemeter systems or remote control systems over the
telephone network.
This device is compatible with CCITT V.21 and contains the entire circuit that
provides a full–duplex or half–duplex 300–baud data communication over a pair
of telephone lines. This device also includes the DTMF generator and call
progress tone detector (CPTD).
The differential line driver has the capability of driving 0 dBm into a 600 Ω load
with a single + 5 V power supply.
The transmit level is controlled by the programmable attenuator in 1 dB steps.
Devices functions are controlled through a 3–wire serial interface.
• Capable of Driving 0 dBm into a 600 Ω Load
• DTMF Generator On–Chip
• Imprecise Call Progress Detector On–Chip
• A Transmit Attenuator Programmable in 1 dB Steps
• 3–Wire Serial Interface
• Compatible with CCITT V.21
• 2100 Hz Answer Tone Generator On–Chip
• Analog Loopback Configuration for Self Test
• Simplex, Half–Duplex, and Full–Duplex Operation
Order this document
by MC145444/D
MC145444
20
1
H SUFFIX
PLASTIC DIP
CASE 804
20
1
DW SUFFIX
SOG PACKAGE
CASE 751D
ORDERING INFORMATION
MC145444P Plastic DIP
MC145444DW SOG Package
PIN ASSIGNMENT
RxBO 1
FTLC 2
GNDA 3
CDA 4
GND 5
TLA 6
X1 7
X2 8
SD 9
RxD 10
20 RxGC
19 RxA
18 TxA1
17 TxA2
16 DSI
15 VCC
14 ENB
13 SCK
12 DATA
11 TxD
This document contains information on a new product. Specifications and information herein are subject to change without notice.
REV 0
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MC145444
1