HT82K628 データシートの表示（PDF） - Holtek Semiconductor

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HT82K628

Multimedia Keyboard Encoder Body

Holtek Semiconductor 

HT82K628A

Pin Description

Pin No.

Pin Name

10~7, 2~1,

40~39, 29~22, R0~R19

14~11

6~3, 38~35 C0~C7

I/O

Description

O Keyboard matrix scanning output pins

I Keyboard matrix scanning input pins

15

VSS

¾ Negative power supply, ground

16

SCROLL

O Scroll Lock indicator

17

NUM

O Num Lock indicator

18

DATA

I/O Bidirectional data transmission line

19

CLOCK

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

20

Fn Select

I Mini-keyboard select, enables the function if connected to VSS.

21

Macro Key Select I Macro Key select, disables the function if connected to VSS.

30

CAPS

O Caps Lock indicator

31

RESET

I

Chip reset input. Active low. Built-in power-on reset circuit to reset the en-

tire chip. Chip can also be externally reset via RESET pin.

32

VDD

¾ 5.0V positive power supply

33

OSC1

I System clock input; 58.3kW resistor connected for RC OSC

34

NC

¾ No connection

Absolute Maximum Ratings

Supply Voltage ..........................VSS-0.3V to VSS+5.5V

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

Storage Temperature ...........................-50°C to 125°C

Operating Temperature ..........................-25°C to 70°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum 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 exposure to extreme conditions may affect device reliabil-

ity.

Electrical Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions

VDD

Conditions

Min. Typ. Max. Unit

VDD

Operating Voltage

¾

¾

3 5 5.25 V

IDD

Operating Current (RC OSC)

5V No load, fSYS= 4MHz ¾ 2.5 5 mA

VIL

Input Low Voltage

5V

¾

0 ¾ 1.5 V

VIH

Input High Voltage

5V

¾

3.5 ¾ 5 V

IOL

Sink Current (C0~C7, R0~R19, DATA, CLOCK) 5V VOL= 0.5V

16 25 ¾ mA

IOH1

Source Current (C0~C7, R0~R19)

5V VOH= 4.5V

-8 -16 ¾ mA

IOH2

Source Current (Scroll, Num, Caps)

5V VOH= 4.5V

-2.5 -4 ¾ mA

ILED

LED Sink Current (Scroll, Num, Caps)

5V VOL=3.4V

10 18 24 mA

Rph

Internal Pull-high Resistance (C0~C7, R0~R19) 5V

¾

5 12 20 kW

Rph1

Internal Pull-high Resistance (DATA, CLOCK) 5V

¾

2 4.7 8 kW

Rph2

Internal Pull-high Resistance (RESET)

5V

¾

25 50 75 kW

fSYS

System Clock (RC OSC)

5V

¾

¾ 4 ¾ MHz

Rev. 1.60

2

April 16, 2004

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