ht82k28a Holtek Semiconductor Inc., ht82k28a Datasheet - Page 2

• Manufacturer Part Number: ht82k28a
• Description: Ht82k28a -- Win98 Keyboard Encoder Restricted Products
• Manufacturer: Holtek Semiconductor Inc.

Pin Description
Absolute Maximum Ratings
Supply Voltage .......................................4.75V to 5.25V
Storage Temperature ............................ 55 C to 125 C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may
Electrical Characteristics
Rev. 1.30
V
I
V
V
V
R
f
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
DD
SYS
Symbol
DD
IL
IH
OL
ph
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
Input Low Voltage (C0~C7)
Input Low Voltage (DATA, CLOCK)
Input High Voltage
Output Low Voltage (R0~R18)
Output Low Voltage (DATA, CLOCK)
Internal Pull-high Resistance (C0~C7)
Internal Pull-high Resistance (CLOCK, DATA)
System Clock
OSC1
VSS
VDD
IO0~IO1
C0~C7
R0~R18
NC
SCRL
NUM
CAP
CLOCK
DATA
Pin Name
Parameter
I/O
I/O
I/O
O
O
O
O
O
I
I
System clock input
Negative power supply, ground
Positive power supply
Customer defined optional output lines
Keyboard matrix scanning input pins
Keyboard matrix scanning output pins
No connection
LED pin
LED pin
LED pin
Synchronous clock signal. Used to clock the transmission data
Bidirectional data transmission line
2
I
I
R=120k
OL
OL
Input Voltage..............................V
Operating Temperature...............................0 C to 70 C
Test Conditions
=10mA
=15mA
Description
Min.
4.75
3.5
0
0
5
2
Typ.
10
SS
5
2
5
4
0.3V to V
HT82K28A
Max.
5.25
V
June 27, 2002
0.6
0.6
0.5
0.5
20
15
5
DD
Ta=25 C
DD
MHz
Unit
mA
+0.3V
k
k
V
V
V
V
V
V