HT82K28 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT82K28

Win98 Keyboard Encoder

Holtek Semiconductor 

HT82K28A

Pin Description

Pin No.

1

2, 4

3

5, 6

39, 40,

7~12

16~23, 28,

29, 13~15

24, 26, 27

33, 35

25, 34

30

31

32

37

38

Pin Name I/O

Description

OSC1

I System clock input

VSS

¾ Negative power supply, ground

VDD

¾ Positive power supply

IO0~IO1

O Customer defined optional output lines

C0~C7

I Keyboard matrix scanning input pins

R0~R18

O Keyboard matrix scanning output pins

NC

SCRL

NUM

CAP

CLOCK

DATA

¾ No connection

O LED pin

O LED pin

O LED pin

I/O Synchronous clock signal. Used to clock the transmission data

I/O Bidirectional data transmission line

Absolute Maximum Ratings

Supply Voltage............................4.75V to 5.25V

Storage Temperature.................-55°C to 125°C

Input Voltage.................VSS-0.3V to VDD+0.3V

Operating Temperature ..................0°C to 70°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-

mum Ratings² may cause substantial damage to the device. Functional operation of this device

at other conditions beyond those listed in the specification is not implied and prolonged expo-

sure to extreme conditions may affect device reliability.

2

February 16, 2000

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