Pin No.

Pin Name

I/O

Description

12

KEY1

I

KEY1 input, low active

13

KEY2

I

KEY2 input, low active

14

KEY3

I

KEY3 input, low active

15

KEY4

I

KEY4 input, low active

16

LED

O

LED flash output

Absolute Maximum Ratings*

Supply Voltage ................................. –0.3V to 5V

Storage Temperature................. –50

Operating Temperature................... 0

*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

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Conditions

Operating Voltage

—

—

2.4

3

3.3

V

Standby Current

3V

—

—

1

5

Operating Current

3V

No load

—

300

600

OUT Source Current

3V

–1

–2

—

mA

OUT Sink Current

3V

1

2

—

mA

LED Source Current

3V

–1

–2

—

mA

Oscillator Frequency

—

R=220k

Ω

—

128

—

kHz

“H” Input Voltage

3V

—

2.4

—

—

V

“L” Input Voltage

3V

—

—

—

0.6

V

HT2844

3

11th July ’97