Silan
Semiconductors
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.
SC3423
46 45 44 43 42 41 40 39 38 37 36 35
47
33
1
32
2
31
3
30
4
29
5
28
6
27
7
8
26
9
25
10
24
11 12 13 14 15 16 17 18 19 20 21 22 23
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
* 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
SC3424
SC3425
SC3426
Has on Chip Oscillator Resistor
Pinning Mirrored Type of SC3423
No Oscillator Resistor
Pinning Mirrored Type of SC3425
ABSOLUTE MAXIMUM RATING
Characteristic
Supply Voltage
Input Voltage
(Note: 1)
(Note: 2)
Symbol
V
DD -
V
SS
V
IN
Rf
T
STG
T
OPT
Value
-0.3 ~ +3.5
-0.3
~
V
DD
+ 0.3
560f5%
-55 ~ +125
0 ~ + 50
Unit
V
V
K¡
°C
°C
Resistance for CG
Storage temperature
Operating Temperature
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.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
1
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
