U3761MB-T

www.DataSheet4U.com 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 Universal Telephone IC All Functions Integrated U3761MB-T Tone Ringer 2-tone Ringer Adjustable Volume RC Oscillator Adjustable Threshold Benefits Low Number of External Components High Quality through One IC Solution Electrostatic sensitive device. Observe precautions for handling. Description Atmel’s low-voltage telephone circuit U3761MB-T performs all the speech and line interface functions required in an electronic telephone set, a tone ringer, a pulse and DTMF dialing with redial, notice function, and 13 memories. Operation below 15 mA is possible with reduced performance. Rev. 4744A–CORD–09/03 Figure 1. Block Diagram 2 Tip VI 100 kW HKS 1a 470 W 3 kW 33 kW HKS 1b 75 V 2N5401 CL 2.2 nF...