ht82k68a Holtek Semiconductor Inc., ht82k68a Datasheet - Page 4

• Manufacturer Part Number: ht82k68a
• Description: Ht82k68a -- Multimedia Keyboard Encoder 8-bit Mask Mcu
• Manufacturer: Holtek Semiconductor Inc.

Note:
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
D.C. Characteristics
Rev. 1.70
PE0~PE1
PE2
PE3
PE4
VDD
VSS
RESET
OSC1
OSC2
V
I
I
I
I
V
V
Pin Name I/O
Symbol
DD1
DD2
STB1
STB2
DD
IL1
IH1
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.
*: Software means the HT IDE (Holtek Integrated Development Environment) can be configured by mask op-
tion.
Operating Voltage
Operating Current (Crystal OSC)
Operating Current (RC OSC)
Standby Current (WDT enabled)
Standby Current (WDT Disabled)
Input Low Voltage for I/O Ports (Schmitt)
Input High Voltage for I/O Ports (Schmitt)
I/O
O
O
O
O
I
I
Crystal or RC
Pull-high
or None
Option
Mask
Parameter
SS
SS
Bidirectional input/output port. Software* instruction determine the CMOS output or
Schmitt trigger input with or without pull-high resistor.
If PE0 output 1, rising edge of PC2 trigger INT circuit.
PE0 output 0, falling edge of PC2 trigger INT circuit.
This pin is a CMOS output structure. The pad can function as LED (SCR) drivers for
the keyboard. I
This pin is a CMOS output structure. The pad can function as LED (NUM) drivers
for the keyboard. I
This pin is a CMOS output structure. The pad can function as LED (CAP) drivers for
the keyboard. I
Positive power supply
Negative power supply, ground
Chip reset input. Active low. Built-in power-on reset circuit to reset the entire chip.
Chip can also be externally reset via RESET pin
OSC1, OSC2 are connected to an RC network or a crystal for the internal system
clock. In the case of RC operation, OSC2 is the output terminal for the 1/4 system
clock; A 110k resistor is connected to OSC1 to generate a 2 MHZ frequency.
0.3V to V
0
.
3V to V
DD
SS
+6.0V
+0.3V
OL
OL
=18mA at V
=18mA at V
OL
=18mA at V
V
3V
5V
3V
5V
3V
5V
3V
5V
3V
5V
3V
5V
4
DD
Storage Temperature ........................... 50 C to 125 C
Operating Temperature .......................... 25 C to 70 C
No load, f
No load, f
No load, system HALT
No load, system HALT
Test Conditions
OL
OL
=3.4V
=3.4V
OL
Conditions
Description
=3.4V
SYS
SYS
= 6MHz
= 6MHz
Min.
2.2
2.1
3.5
0
0
Typ.
0.7
0.5
December 26, 2005
2
2
HT82K68A
Max.
5.5
1.5
0.9
1.5
15
5
1
5
8
3
6
3
5
Ta=25 C
Unit
mA
mA
V
V
V
A
A