GENERAL DESCRIPTION
The MSM7524 is the single chip DTMF transceiver –generator/receiver– with the call progress
tone generator/detector and the special tone –1300 Hz in the first version, possible to be
modified–detector.
Each function block can be controlled by an external MCU via 4-bit processor interface.
The chip operates with +5 V single supply with low power consumption, and is suitable for the telephone terminal equipment.

FEATURES
• Power supply voltage : +5 V ±10%
• Low power consumption
  Operating mode : 8 mA Typ.
  Power down mode : 10 mA Typ.
• 4-bit processor interface
• Dynamic range of DTMF receiver : 40 dB
• Low signal distortion output from DTMF generator
• Call progress tone detector : 330 to 640 Hz
• Call progress tone generator : 350/400/440/480 Hz
• Special tone detector: 1300 Hz ±20 Hz (for FAX)
• 3.58 MHz crystal oscillator circuit on chip
• Package :
  32-pin plastic SSOP (SSOP32-P-430-1.00–K) (Product name : MSM7524GS-K)