HM9270C

Features:

• Complete receiver in an 18-pin package.
• Excellent performance.
• CMOS, single 5 volt operation.
• Minimum board area.
• Central office quality.
• Low power consumption.
• Power-Down mode (HM9270D only).
• Inhibit-mode (HM9270D only).


Pinout




Specifications

Parameters	Min.	Max.	Units
Power Supply Voltage, VDD - VSS		6	V
Voltage on any pin	VSS - 0.3	VDD+ 0.3	V
Current at any pin		10	mA
Operating temperature	-40	+85
Storage temperature	-65	+150
Package power dissipation		500	mW

Description

The HM 9270C/D is a complete DTMF receiver integrating both the bandsplit filter and digital decoder functions. The filter section of HM 9270C/D uses switched capacitor techniques for high- and low-group filters and dial-tone rejection. Digital counting techniques are employed in the decoder to detect and decode all 16 DTMF tonepairs into a 4-bit code. External component count is minimized by on-chip provision of a differential input amplifier, clock-oscillator and latched 3-state bus interface.