Silan

Semiconductors

SC2268

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

2

ABSOLUTE MAXIMUM RATINGS

Characteristic

Symbol

Value

Unit

Supply Voltage

0~6.0

V

Input/Output Voltage

V

Power Dissipation

500

mW

Operating Temperature

Topr

-20 ~ +70

°C

Storage Temperature

Tstg

-55 ~ +125

°C

Parameter

Symbol

Test conditions

Min

Typ

Max

Unit

Operating Voltage

--

2.2

3

5

V

Operating Current(note)

OSC On, TxOUT is floating.

--

0.5

1

mA

Standy-by Current

I1 ~ I8 = “L” OSC Stops.

TxOUT is floating.

0.5

1

3

µA

8

15

--

Sinking Current of TxOUT

4

6

--

mA

High Level

--

--

Input Voltage of

I1 ~I8

Low level

--

0

--

V

Input Pull-Low Resistor

--

30

50

80

k

Ω

Input Pull-High Resistor

--

40

90

150

k

Ω

Oscillation frequency

--

--

455

--

kHz

Note: For pins I1 ~ I8 : Any one of the said pins is set to HIGH while the others are set to LOW.

PIN DESCRIPTION

Pin No.

Symbol

I/O

Function

1~8

I1 ~ I8

I

Key input pins.

These pins are used to connect a maximum of 8 keys.

(each pin has a built-in pull-low resistor).

9

Vss

--

Negative power supply.

11~12

C4~C5

I

Select input pin for start word.

These pins have internal pull-low resistor.

10

C6

I

Select input pin for start word.

This pins have internal pull-high resistor.

13

TxOUT

O

Transmission output pin.

This pin is an open drain (NMOS) output and is used to transmit

signals. The carrier frequency is 38kHz.

15

OSCI

I

Oscillator Input Pin

14

OSCO

O

Oscillator Outpu Pin

These pins are used to externally

connect a 455kHz ceramic resonator.

16

Vcc

--

Positive power supply.