HT9270（英文原版）

and dial-tone rejection. Digital counting techniques are employed in

the decoder to detect and decode all 16 DTMF tone-pairs 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.

Figure 1. block diagram

Power Supply Voltage V

6V

Voltage on any pin -- V

-0.3 ~ V

Package power dissipation 500 mW

Note: 1. Absolute maximum ratings are those values beyond which damage to the device may occur.

2. Unless otherwise specified, all voltages are referenced to ground.

(Note 1)

Positive Supply Voltages V

V

Oscillator Clock Frequency fc -- -- 3.579545 -- MHz

Operating Supply Voltage V

Operating Supply Current I

Power Consumption P

Standby Current I

-- -- 100