U3761MB-S

Features:

Speech Circuit
  Adjustable DC characteristic
  Symmetrical input of microphone amplifier
  Receiving amplifier for dynamic or piezo-electric earpieces
  Automatic line-loss compensation
Dialer
  DTMF / pulse switchable
  Pulse dialing 66/33 or 60/40 or DTMF dialing selectable by pin
  Selectable flashing duration by key pad
  Pause function
  Optical indication of temporary DTMF mode
  Keytone for pulse dialing
  Last number redial up to 32 digits
  Three by 17 digits direct (one-touch) memory
  Ten by 17 digits indirect (two-touch) memory
  Notice function up to 32 digits
  Standard low-cost crystal 3.58 MHz or ceramic resonator
  Handset Mute (Privacy) with optical indication
  Additional toggle flipflop
  Internal loop interrupt detection
Tone Ringer
  2-tone ringer
  Adjustable volume
  RC oscillator
  Adjustable threshold
Benefits
  Low number of external components
  High quality through one IC solution


Pinout




Specifications

Parameters	Symbol	Value	Unit
Line current	IL	140	mA
DC line voltage	VL	14	V
DC voltage at Pins 1 to 11 and 33 to 44	VDC	5.5	V
Junction temperature	Tj	125	°C
Ambient temperature	Tamb	25 to +75	°C
Storage temperature	Tstg	55 to +150	°C
Total power dissipation, Tamb = 60°C   SSO44	Ptot	0.9	W
Junction ambient                                     SSO44	RthJA	70	k/W

Description

TEMIC Semiconductors'U3761MB-S low-voltage telephone circuit U3761MB performs all the speech and line interface functions required in an electronic telephone set, the tone ringer, the pulse and DTMF dialing with redial, notice function, and 13 memories. Operation below 15 mA is possible with reduced performance.

Electrostatic sensitive U3761MB-S. Observe precautions for handling.