Freescale Semiconductor, Inc.
MC145442
MC145443
Single-Chip 300-Baud Modem
The MC145442 and MC145443 silicon–gate CMOS single–chip low–speed
modems contain a complete frequency shift keying (FSK) modulator, demodulator, and filter. These devices are with CCITT V.21 (MC145442) and Bell 103
(MC145443) specifications. Both devices provide full–duplex or half–duplex
300–baud data communication over a pair of telephone lines. They also include
a carrier detect circuit for the demodulator section and a duplexer circuit for
direct operation on a telephone line through a simple transformer.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
MC145442 Compatible with CCITT V.21
MC145443 Compatible with Bell 103
Low–Band and High–Band Band–Pass Filters On–Chip
Simplex, Half–Duplex, and Full–Duplex Operation
Originate and Answer Mode
Analog Loopback Configuration for Self Test
Hybrid Network Function On–Chip
Carrier Detect Circuit On–Chip
Adjustable Transmit Level and CD Delay Timing
On–Chip Crystal Oscillator (3.579 MHz)
Single + 5 V Power Supply Operation
Internal Mid–Supply Generator
Power–Down Mode
Pin Compatible with MM74HC943
Capable of Driving – 9 dBm into a 600 Ω Load
P SUFFIX
PLASTIC DIP
CASE 738
20
1
DW SUFFIX
SOG PACKAGE
CASE 751D
20
1
ORDERING INFORMATION
MC145442P
MC145443P
Plastic DIP
Plastic DIP
MC145442DW SOG Package
MC145443DW SOG Package
PIN ASSIGNMENT
DSI
1
20
TLA
LB
2
19
VAG
CD
3
18
Exl
CDT
4
17
TxA
RxD
5
16
RxA1
VDD
6
15
RxA2
CDA
7
14
SQT
Xout
8
13
MODE
Xin
9
12
VSS
FB
10
11
TxD
REV 1
8/95
MC145442
1