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HT82K74E Datasheet(PDF) 4 Page - Holtek Semiconductor Inc

Part # HT82K74E
Description  27MHz Keyboard/ Mouse TX 8-Bit MCU
PDF  56 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT82K74E Datasheet(HTML) 4 Page - Holtek Semiconductor Inc

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D.C. Characteristics
Ta=25
°C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VDD
Conditions
VDD
Operating Voltage
¾
Others
2.0
¾
3.3
V
VOUT
DC-DC Operating Voltage
¾ fSYS=27MHz
2.8
¾
3.3
V
IDD
Operating Current (Crystal OSC)
3V
No load, fSYS= 27MHz
¾
36
mA
ISTB
Standby Current
¾
No load, system HALT
WDT disable, LVR disable
¾¾
20
mA
VIL1
Input Low Voltage for I/O
(Schmitt Trigger)
¾¾
0
¾
0.3VDD
V
VIH1
Input High Voltage for I/O
(Schmitt Trigger)
¾¾
0.7VDD
¾
VDD
V
VIL2
Input Low Voltage (RES)
¾¾
0
¾
0.3VDD
V
VIH2
Input High Voltage (RES)
¾¾
0.9VDD
¾
VDD
V
VLVR
Low Voltage Reset
¾¾
3.5
3.8
4.0
V
IOL1
Other I/O Pins Sink Current
3V
VOL=0.1VDD
4
¾¾
mA
IOH1
Other I/O Pins Source Current
3V
VOH=0.9VDD
-2.5
-4.5
¾
mA
RPH1
Other Pins Internal Pull-high
Resistance
3V
¾
10
30
50
k
W
BAT-in
Input Voltage
¾¾
2
2.8
3.3
V
A.C. Characteristics
Ta=25
°C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VDD
Conditions
fSYS
System Clock
¾¾
¾
27
¾
MHz
tRCSYS
Watchdog OSC Period
3V
¾¾
71
¾ms
tWDT
Watchdog Time-out Period with
6-stage Prescaler
3V
WDTS=1
¾
4.57
¾
ms
tSST
System Start-up Timer Period
¾¾
¾
1024
¾
tSYS
tOSTSETUP Crystal Setup
¾¾
¾
10
¾
ms
tLVR
Low Voltage Width to Reset
¾¾
0.25
1.00
2.00
ms
tRES
External Reset Low Pulse Width
¾¾
10
¾¾
ms
Note: tSYS=1/fSYS
HT82K74E/HT82K74EE
Rev. 1.00
4
December 15, 2009



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