MC145442B Datasheet (Motorola) - Single-Chip 300-Baud Modem

MC145442B, Single-Chip 300-Baud Modem

ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to VSS) Rating Supply Voltage DC Input Voltage DC Output Voltage Clamp Diode Current, per Pin DC Output Current, per Pin Power Dissipation Operating Temperature Range Storage Temperature Range Symbol VDD Vin Vout IIK, IOK Iout PD TA Tstg Value

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145442B/D Single-Chip 300-Baud Modem The MC145442B and MC145443B silicon gate CMOS single chip low speed modems contain a complete frequency shift keying (FSK) modulator, demodulator, and filter.

These devices are compatible with CCITT V.21 (MC145442B) and Bell 103 (MC145443B) specifications.

Both devices provide full duplex or half duplex 300 baud data communication over a pair of

MC145442B Features

* es for the selected mode. (See Tables 1 and 2 and Figures 4c and 4d.) When LB is connected to analog ground (VAG), the modulator generates an echo cancellation tone of 2100 Hz for MC145442B CCITT V.21 and 2225 Hz for MC145443B Bell 103 systems. For normal operation, this pin should be at a logic low