HT2844
P in No. P in Na m e
I/O
Descr ip tion
12
13
14
15
16
KEY1
KEY2
KEY3
KEY4
LED
I
I
KEY1 input, low active
KEY2 input, low active
KEY3 input, low active
KEY4 input, low active
LED flash output
I
I
O
Absolute Maximum Ratings*
Supply Voltage ................................. –0.3V to 5V
Input Voltage.................... VSS–0.3 to VDD+0.3V
Storage Temperature................. –50°C to 125°C
Operating Temperature................... 0°C to 70°C
*Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent
damageto the device. These are stress ratings only. Functional operation of this device at
these or any other conditions above those indicated in the operational sections of this
specification is not implied and exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
Electrical Characteristics
(Ta=25°C)
Test Con d ition s
Sym bol
P a r a m eter
Min .
Typ .
Ma x. Un it
VDD
Con d ition s
—
VDD
ISTB
IDD
Operating Voltage
Standby Current
—
3V
3V
3V
3V
3V
—
2.4
—
—
–1
1
3
1
3.3
5
V
µA
µA
mA
mA
mA
kHz
V
—
Operating Current
OUT Source Current
OUT Sink Current
LED Source Current
Oscillator Frequency
“H” Input Voltage
“L” Input Voltage
No load
VOH=2.5V
VOL=0.5V
VOL=2.5V
R=220kΩ
—
300
–2
2
600
—
IOH
IOL
—
ILED
FOSC
VIH
–1
—
2.4
—
–2
128
—
—
—
—
3V
3V
—
VIL
—
0.6
V
3
11th J uly ’97
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
