ht82k68e Holtek Semiconductor Inc., ht82k68e Datasheet - Page 5

• Manufacturer Part Number: ht82k68e
• Description: Ht82k68e -- Multimedia Keyboard Encoder 8-bit Otp Mcu
• Manufacturer: Holtek Semiconductor Inc.

A.C. Characteristics
Note:
Rev. 2.00
V
V
V
I
I
I
I
t
R
R
f
f
t
t
t
t
t
t
Symbol
Symbol
OL
OH1
OH2
LED
POR
SYS1
SYS2
WDTOSC
WDT1
WDT2
RES
SST
INT
f/f
f/f1
IL2
IH2
LVR
PH
PH1
t
SYS
Input Low Voltage (RESET)
Input High Voltage (RESET)
Low Voltage Reset
I/O Port Sink Current of PA, PB, PC,
PD, PE0~1
I/O Port Source Current of PA, PB,
PC2~7 PD, PE0~1
I/O Port Source Current of PE2~4
LED Sink Current (SCR, NUM, CAP)
Power-on Reset Time
Internal Pull-high Resistance of PA,
PB, PC, PD, PE Port
Internal Pull-high Resistance of DATA,
CLK
Frequency Variation
Frequency Variation
System Clock (Crystal OSC)
System Clock (RC OSC)
Watchdog Oscillator Period
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
5V
5V
5V
5V
5V
3V
5V
3V
5V
5V
5V
3V
5V
3V
5V
3V
5V
3V
5V
DD
DD
5
V
V
V
V
R=100k , C=0.1 F
Crystal
RC
OSC resistor 40k
OSC resistor 40k
Without WDT prescaler
Without WDT prescaler
Power-up or
wake-up from HALT
Test Conditions
Test Conditions
OL
OH
OH
OL
= 0.5V
=3.4V
= 4.5V
= 4.5V
Conditions
Conditions
Min.
Min.
2.4
4.0
4.8
4.8
16
10
50
30
15
45
35
12
2.5
0
0
4
2
9
1
1
8
1024
1024
Typ.
Typ.
100
2.4
4.7
25
18
60
30
90
78
23
19
16
9
6
6
6
6
4
HT82K68E
Max.
Max.
150
180
130
0.7
1.3
7.2
7.2
24
90
45
15
45
35
July 10, 2007
3
5
8
20
1
Ta=25 C
MHz
MHz
MHz
MHz
Unit
Unit
t
t
mA
mA
mA
mA
ms
k
k
k
k
ms
ms
SYS
SYS
%
%
V
V
V
V
V
s
s
s
s