Silan

Semiconductors

SC3423

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

1

8-DIGIT CALCULATOR

DESCRIPTION

The SC3423 is a single-chip LSI CMOS calculator with 8-digit four

function arithmetic operations, single memory, extraction of square

root and percentage calculation functions, leading zero and trailing

zero suppression, chain calculations and internal debouncing and

encoding of keyboard inputs. It is designed for LCD operation with

3.0V power supply (either from solar cell or battery), auto-power off,

low power dissipation and single power supply making the SC3423

ideal for hand held calculators with low system cost.

FEATURES

* Number of digits - 8 digits (rough estimated calculation is possible).

* Calculations:

- Standard four functions (+ , - , x , +).

- Chain multiplication and division.

- Auto-constant calculation (constant multiplicand, divisor,

addend and subtrahend).

- Square and reciprocal calculations.

- Extraction of square root.

- Percentage calculations.

- Power calculations.

- Rough estimate calculations.

- Memory calculations.

* Decimal point system-complete floating decimal point system.

* Negative number indication: number + minus (-) sign.

SC3423 chip topography

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* Display format: 8 digits & sign (-, E & M)

leading zero suppression

zero shift.

* Touch tone function and display.

* Punctuation comma display.

* Auto power off ability.

ORDERING INFORMATIOM

SC3423

Has on Chip Oscillator Resistor

Pinning Mirrored Type of SC3423

SC3425

SC3426

No Oscillator Resistor

Pinning Mirrored Type of SC3425

SC3424

ABSOLUTE MAXIMUM RATING

Characteristic

Symbol

Value

Unit

Supply Voltage

-0.3 ~ +3.5

V

Input Voltage

(Note: 1)

V

Resistance for CG

(Note: 2)

Rf

560

f5%

K

¡

Storage temperature

-55 ~ +125

°C

Operating Temperature

0~+50

°C

Note: 1.Maximum voltage on any pin with respect to the Vss.

2.Resistor value for CG is varied according to the floating capacitance on a printed circuit board.