ht82k628a Holtek Semiconductor Inc., ht82k628a Datasheet - Page 2

• Manufacturer Part Number: ht82k628a
• Description: Ht82k628a -- Windows 2000 Ps/2 Keyboard Encoder
• Manufacturer: Holtek Semiconductor Inc.

Pin Description
Absolute Maximum Ratings
Supply Voltage ..........................V
Input Voltage .............................V
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may
Electrical Characteristics
Rev. 1.60
10~7, 2~1,
40~39, 29~22,
14~11
6~3, 38~35
15
16
17
18
19
20
21
30
31
32
33
34
V
I
V
V
I
I
I
I
R
R
R
f
Symbol
DD
OL
OH1
OH2
LED
SYS
DD
IL
IH
ph
ph1
ph2
Pin No.
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.
Operating Voltage
Operating Current (RC OSC)
Input Low Voltage
Input High Voltage
Sink Current (C0~C7, R0~R19, DATA, CLOCK)
Source Current (C0~C7, R0~R19)
Source Current (Scroll, Num, Caps)
LED Sink Current (Scroll, Num, Caps)
Internal Pull-high Resistance (C0~C7, R0~R19)
Internal Pull-high Resistance (DATA, CLOCK)
Internal Pull-high Resistance (RESET)
System Clock (RC OSC)
R0~R19
C0~C7
VSS
SCROLL
NUM
DATA
CLOCK
Fn Select
Macro Key Select
CAPS
RESET
VDD
OSC1
NC
Pin Name
Parameter
SS
SS
0.3V to V
0
I/O
I/O
I/O
O
O
O
O
.
I
I
I
I
I
3V to V
Keyboard matrix scanning output pins
Keyboard matrix scanning input pins
Negative power supply, ground
Scroll Lock indicator
Num Lock indicator
Bidirectional data transmission line
Synchronous clock signal. Used to clock the transmission data.
Mini-keyboard select, enables the function if connected to VSS.
Macro Key select, disables the function if connected to VSS.
Caps Lock indicator
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.
5.0V positive power supply
System clock input; 58.3k resistor connected for RC OSC
No connection
DD
SS
+5.5V
+0.3V
2
V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
Storage Temperature ........................... 50 C to 125 C
Operating Temperature .......................... 25 C to 70 C
DD
Test Conditions
No load, f
V
V
V
V
OL
OH
OH
OL
= 0.5V
=3.4V
= 4.5V
= 4.5V
Conditions
Description
SYS
= 4MHz
Min. Typ. Max. Unit
3.5
16
10
25
2.5
3
0
5
2
8
HT82K628A
2.5
4.7
25
18
12
50
5
16
4
4
April 16, 2004
5.25
1.5
24
20
75
5
5
8
Ta=25 C
MHz
mA
mA
mA
mA
mA
k
k
k
V
V
V