MC145443B_ARCHIVED: Single-Chip 300-Baud Modem ARCHIVED

Overview

The MC145443B has been discontinued. Suggested replacement: none.

The MC145443B is a silicon-gate CMOS single-chip, low-speed modem containing a complete frequency shift keying (FSK) modulator, demodulator, and filter. This device is compatible with Bell 103 specifications. The MC145443B provides full-duplex or half-duplex 300-baud data communication over a pair of telephone lines. It also includes a carrier detect circuit for the demodulator section and a duplexer circuit for direct operation on a telephone line through a simple transformer.

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Features

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
Internal Mid-Supply Generator
Power-Down Mode
Pin Compatible with MM74HC943
Capable of Driving -9 dBm into a 600 ohm Load

Test

MoreLess

Features

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
Internal Mid-Supply Generator
Power-Down Mode
Pin Compatible with MM74HC943
Capable of Driving -9 dBm into a 600 ohm Load

Test

Data Sheets