ML145442
ML145443
Single–Chip 300–Baud Modem
Legacy Device: Motorola MC145442B, MC145443B
The ML145442 and ML145443 silicon–gate CMOS single–chip low–speed
modems contain a complete frequency shift keying (FSK) modulator, demod-
ulator, and filter. These devices are compatible with CCITT V.21 (ML145442)
and Bell 103 (ML145443) 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.
P DIP 20 = RP
PLASTIC DIP
CASE 738
20
1
SOG 20 = -6P
SOG PACKAGE
CASE 751D
20
1
This Device Offers The Following Performance Features:
CROSS REFERENCE/ORDERING INFORMATION
PACKAGE
MOTOROLA
MC145442BP
LANSDALE
ML145442RP
• ML145442 Compatible with CCITT V.21
• ML145443 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
P DIP 20 H
SO 20W
MC145442BDW ML145442-6P
P DIP 20 H
SO 20W
MC145443BP
ML145443RP
MC145443BDW ML145443-6P
• Analog Loopback Configuration for Self Test
• Hybrid Network Function On–Chip
• Carrier Detect Circuit On–Chip
Note: Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from ML to MLE.
• Adjustable Transmit Level and CD Delay Timing
• On–Chip Crystal Oscillator (3.579 MHz)
• Single +5 V Power Supply Operation
• Internal Mid–Supply Generator
PIN ASSIGNMENT
• Power–Down Mode
DSI
LB
1
2
20 TLA
19
• Pin Compatible with MM74HC943
• Capable of Driving –9 dBm into a 600 W Load
V
AG
• Operating Temperature Range = T –40° to +85°C
A
CD
3
4
18 Exl
17 TxA
CDT
RxD
5
6
16 RxA1
15 RxA2
14 SQT
13 MODE
V
DD
CDA
7
8
9
X
out
X
12
V
SS
in
FB 10
11 TxD
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