ht82k68a Holtek Semiconductor Inc., ht82k68a Datasheet - Page 5

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

A.C. Characteristics
Note:
Rev. 1.70
V
V
V
V
V
I
I
I
I
t
R
R
R
Df/f
f
f
t
t
t
t
t
t
Symbol
Symbol
OL
OH1
OH2
LED
POR
SYS1
SYS2
WDTOSC
WDT1
WDT2
RES
SST
INT
LVR
IL2
IH2
IL3
IH3
PH
PH1
PH2
t
SYS
Low Voltage Reset
Input Low Voltage for I/O Ports (CMOS)
Input High Voltage for I/O Ports (CMOS)
Input Low Voltage (RESET)
Input High Voltage (RESET)
I/O Port Sink Current
(PA, PB, PC, PD, PE0~PE1)
I/O Port Source Current
(PA, PB, PC2~PC7, PD, PE0~PE1)
I/O Port Source Current (PE2~PE4)
LED Sink Current (SCR, NUM, CAP)
Power-on Reset Time
Internal Pull-high Resistance
(PA, PB, PC, PD, PE)
Internal Pull-high Resistance (DATA, CLK)
Internal Pull-high Resistance (RESET)
Frequency Variation
System Clock (Crystal OSC)
System Clock (RC OSC)
Watchdog Oscillator
Watchdog Time-out Period (RC)
Watchdog Time-out Period
(System Clock)
External Reset Low Pulse Width
System Start-up Timer Period
Interrupt Pulse Width
= 1/f
SYS
Parameter
Parameter
V
V
3V
5V
3V
5V
3V
5V
3V
5V
3V
5V
3V
5V
3V
5V
3V
5V
5V
5V
5V
5V
5V
3V
5V
3V
5V
3V
5V
5V
¾
¾
¾
¾
¾
DD
5
DD
OSC resistor 40kW
Without WDT prescaler
Without WDT prescaler
Power-up or wake-up
from HALT
V
V
V
V
R=100kW, C=0.1mF
Crystal
RC
Test Conditions
Test Conditions
OL
OH
OH
OL
= 0.5V
=3.4V
= 4.5V
= 4.5V
Conditions
Conditions
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
Min.
-2.5
Min.
1.7
2.7
2.4
4.0
4.8
4.8
16
-8
10
30
30
15
30
15
45
35
12
¾
¾
¾
¾
¾
¾
¾
0
0
0
0
4
2
9
1
1
1024
1024
Typ.
Typ.
-16
2.4
4.7
25
-4
18
60
60
30
60
31
90
76
23
19
¾
¾
December 26, 2005
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
9
6
6
6
6
HT82K68A
Max.
Max.
±20
180
130
1.2
2.3
0.7
1.3
7.2
7.2
45
35
¾
¾
¾
¾
24
90
90
45
15
90
46
±1
¾
¾
¾
¾
¾
¾
3
5
3
5
8
Ta=25°C
Unit
Unit
MHz
MHz
t
t
mA
mA
mA
mA
ms
kW
kW
kW
ms
SYS
SYS
ms
ms
ms
%
%
V
V
V
V
V