Overview

The LC7367J, 7367JM are DTMF/OUTPUT-PULSE dialer CMOS ICs with redial function for use in pushbutton telephones.

Features

• Low voltage CMOS process for direct operation from telephone line.

• Possible to use single contact or standard 2-of-7, 2-of-8 key pad.

• Possible to use color-burst crystal resonator for on-chip oscillator (fOSC=3.58MHz).

• Possible to use either mode select pin (P/T) or function key (4×4 matrix key) to select DTMF mode/OUTPUTPULSE mode.

• Mode change with MC key is made in one direction onlyfrom pulse mode to tone mode.

• Delivers 12 DTMF signals when in DTMF mode.

• On-chip 31-digit redial memory.

• Possible to provide mix redial (31 digits-PAUSE-MC) of DTMF/OUTPUT-PULSE mode.

• Either auto pause select (4s.×n) or manual release available for mode select standby time during redial operation.

• Output pulse make rate of OUTPUT-PULSE mode : Pinselectable (33.2 or 40).

• Output pulse rate of OUTPUT-PULSE mode : Pinselelctable (10pps or 20pps).

• On-chip circuit to prevent malfunction due to noise pulse caused by key entry.

• Key touch tone (pacifier tone) output capability. OUTPUT-PULSE mode : 1243Hz/50ms

• Supply voltage / operating temperature

DTMF mode :

VDD=2.0 to 6.0V / Ta=–30 to +70°C

OUTPUT-PULSE mode :

VDD=1.5 to 6.0V / Ta=–30 to +70°C

• Operating current

DTMF mode :

IDD=1.0mA max / VDD=3.5V

OUTPUT-PULSE mode :

IDD=500µA max / VDD=3.5V

• Data retention current IDR≤0.5µA / VDD=1.0V

• Package

LC7367J : Dual-in-line shrink 22-pin package

LC7367JM : Miniflat 30-pin package