HT9201B datasheet(4/7 Pages) HOLTEK

4 / 7 page

Electrical Characteristics

(Ta=25

°C)

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

VDD

Operating Voltage

—

5.5

IDD

Operating Current

2.5V

Keypad entry

No load

—0.6

ISTB

Standby Current

2.5V No load, no entry

—

µA

VIL

Input Low Voltage

—

VSS

—

0.2VDD

VIH

Input High Voltage

—

0.8VDD

—VDD

IXMO

XMUTE Leakage Current

—

VXMUTE=12V

No entry

——

µA

IOLXM

XMUTE Sink Current

2.5V VXMUTE=0.5V

—

IOH1

Keypad Pin Source Current 2.5V VOH=0V

–4

—

–40

µA

IOL1

Keypad Pin Sink Current

2.5V VOL=2.5V

200

400

—

µA

TDB

Key-in Debounce Time

—

FOSC=3.5795MHz

—

FOSC

System Frequency

—

Crystal=3.5795MHz 3.5759 3.5795 3.5831 MHz

Tone Mode Electrical Characteristics

(FOSC=3.5795MHz, Ta=25

°C)

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

VTDC

DTMF Output DC Level

—

0.45VDD

—0.7VDD

ITOL

DTMF Sink Current

2.5V VDTMF=0.5V

0.1

—

VTAC

DTMF Output AC Level

—

Row group, RL=5k

Ω

0.12

0.155

0.18

Vrms

DTMF Output Load

2.5V THD

≤–23dB

—

Ω

ACR

Column Pre-emphasis

2.5V Row group=0dB

THD

DTMF Signal Distortion

2.5V RL=5k

Ω

—–30

–23

THD (Distortion) (dB) = 20 log

(

√

2 + V22+ … + Vn2 ⁄

√

2 + Vh2 )

Vi, Vh: Row group and column group signals

V1, V2, ... Vn: Harmonic signals (BW=300Hz~3500Hz)

HT9201A/B

3rd Dec ’97

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