HT9320 datasheet(7/30 Pages) HOLTEK

7 / 30 page

Pin Name I/O

Internal

Connection

Description

CLOCK

NMOS OUT

NMOS open drain output. When dialing, it outputs a series of

pulse trains for DOUT data synchronization. DOUT data is

valid at the falling edge of clock.

VDD

Positive power supply, 2.0V~5.5V for normal operation

VSS

Negative power supply

HST

CMOS IN

Pull-low

(HT9320A)

On-hook store enable input

HST=VDD: On-hook store (HT9320A/H)

HST=Floating: Off-hook store (HT9320A)

HST=VSS: Off-hook store (HT9320H)

The Pull-low resistance is 200kW typ.

CMOS IN

(HT9320H)

M/B

CMOS IN

Pull-high

(HT9320A)

Make/Break ratio selection

M/B=VSS: 33.3/66.6 (HT9320A)

M/B=Floating: 40/60 (HT9320A)

M/B=VDD: 33.3/66.6 (HT9320H)

M/B=VSS: 40/60 (HT9320H)

The pull-high resistance is 200kW typ.

CMOS IN

(HT9320H)

CMOS OUT

Keytone output pin. Outputs a 1.2kHz tone carrier for 34ms

each time a key is pressed in the pulse mode.

Approximate internal connection circuits

HT9320

July 21, 1999

NM O S O UT

VD D

CM O S I N/ O U T

CM O S O UT

CM O S I N

Pu l l - l o w

CM O S I N

Pu l l - h i g h

CM O S I N

OS C I L L A T OR

10M

20pF

10pF

VD D

HT9320 Datasheet(PDF) 7 Page - Holtek Semiconductor Inc

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