HT8656B datasheet(4/11 Pages) HOLTEK

Part #	HT8656B

Description	Talking Back

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Manufacturer	HOLTEK [Holtek Semiconductor Inc]

Direct Link	http://www.holtek.com

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4 / 11 page

Pin Description

Pin No.

Pin Name

I/O

Internal

Connection

Description

1, 2

A6, A7

O

CMOS

DRAM address output

3~8

A5~A0

O

CMOS

DRAM address output

9

RASB

O

CMOS

DRAM row address strobe

10

WRB

O

CMOS

DRAM write enable

11

DATA

I/O

CMOS

DRAM data input/output

12

A8

O

CMOS

DRAM address output

13

CASB

O

CMOS

DRAM column address strobe

14

OSC2

O

—

Oscillator output

15

OSC1

I

—

Oscillator input

16

LEDB

O

NMOS

Open Drain

LED indicator:

Idle: LED is turned on

Record: LED flashes

Play: LED is turned off

17

START

O

NMOS

Open Drain

System start pin

18

MOTOR

O

CMOS

Motor drive output (active high) when playing back

19

VSS

I

—

Negative power supply (GND)

20

BIAS

I

—

For internal AMP bias de-coupling

21

AIN1

I

—

Internal AMP first stage input (inverted)

22

AO1

O

—

Internal AMP first stage output

23

AIN2

I

—

Internal AMP second stage input (inverted)

24

IOUT

(8656A)

O

—

Voltage type audio output for an external power AMP

24

IOUT

(8656B)

O

—

Current type audio output for an external transistor

25

VDD

I

—

Positive power supply

26

TESTB

I

Pull-High

For IC test only

27

16KB

I

Pull-High

32Kbps/16Kbps sampling rate selection:

Open/high: 32Kbps

Low: 16Kbps

28

MS

I

Pull-High

64K/256K DRAM size selection:

Open/high: 64K

Low: 256K

HT8656

4

5th May ’98

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HT8656B Datasheet(PDF) 4 Page - Holtek Semiconductor Inc

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