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
Semiconductors
PAD
ASSIGNMENT
S1
S2
V
DD
H1
a1
b1
c1
a2
b2
c2
a3
b3
CG
IN
K4
K6
K5
P1
P2
A5
A4
A3
A2
K2
K3
SC3423
46 45 44 43 42 41 40 39 38 37 36 35
47
1
2
3
4
5
6
7
8
9
10
11 12 13 14 15 16 17 18 19 20 21 22
33
32
31
30
Ti
Po
V
SS
H3
H2
a9
c8
b8
a8
c7
b7
SC3423
29
28
27
26
25
24
23
b5
c5
a4
b4
a5
a6
Note: The IC substrate should be connected to V
DD
in the PCB layout artwork.
ELECTRICAL CHARACTERISTICS
(Ta=25
°C,
V
DD
=3.0V,Unless otherwise specified)
Parameter
Input Voltage 1 ( Note: 3 )
Input Voltage 2 ( Note: 4 )
Input Current 1 ( Note: 5 )
Input Current 2 ( Note: 6 )
Input Current 3 ( Note: 4 )
Input Current 3 ( Note: 4 )
Output Voltage 1 ( Note: 7 )
Symbo
l
V
IH1
V
IL1
V
IH2
V
IL2
I
IH1
I
IL1
I
IH2
I
IL2
I
IH3
I
IL3
I
IH3
I
IL3
V
OL1
V
OA
V
OB
V
OC
F
D
I
OL
I
OH
I
DD
Test conditions
Min
V
DD
-0.4
--
V
DD
-0.4
--
a7
b6
c3
c4
c6
Typ
--
--
--
--
--
5.5
--
--
--
10
30
--
--
--
2.95
1.50
0
75
1.5
1.3
--
20
Max
--
0.4
--
0.2
1
10
1
1
1
15
40
1
--
0.15
--
1.70
0.20
--
--
--
0.1
30
Unit
V
V
µA
µA
µA
µA
V
V
IN
=V
DD
V
IN
=0V
V
IN
=V
DD
V
IN
=0V
V
IN
=V
DD
V
IN
=0V
V
IN
=V
DD
V
IN
=0V
I
OUT
=15µA
without load
without load
without load
V
DD
=3V, display on, Rf=560k
V
DD
=3V, V
OL
=0.5V,TI=3V
V
DD
=3V, V
OH
=2.5V,TI=0V
Display off, ( Note: 9 )
S2=V
SS
S2= V
DD
--
--
--
--
--
5
20
--
V
DD
– 0.15
--
2.80
1.30
--
50
1.0
1.0
--
--
V
OH1
without load
Output Voltage 2 ( Note: 8 )
Display Frequency ( Note: 8 )
Touch Tone Output
Drive Current ( Note: 11 )
Dissipation Current
V
Hz
mA
µA
V
DD1
V
DD
=3V, display on, ( Note: 10 )
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
2
Silan
Semiconductors
Note: 3. Applies to Pins K2 – K6, TI and S2.
4. Applies to Pin S1.
5. Applies to Pins K2 ~ K6 and TI.
6. Applies to Pin S2.
7. Applies to P1, P2, A2 ~ A5.
8. Applies to H1 ~ H3, a1 ~ a9, b1 ~ b8, c1 ~ c8.
9. Measured by the next test circuit after powe
supply automatically yurns off.
10. Measured by the next test circuit while “0” is
being displayed after auto-clear operation
and while key is not being depressed.
11. Applies to PO
SC3423
32
2
SC3423
V
SS
34
35
1
47
-
µA
+
V
DD
I
DD
Test Circuit
Rf=560k +/- 5%
V
SS
OUTPUT
WAVEFORM 1;
Hi
VOA
VOB
T
VOC
Fd=1/T
VOA
OUTPUT
WAVEFORM 2
ai, bi, ci
VOC
PIN DESCRIPTION
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Symbol I/O
S2
V
DD
H1
a1
b1
c1
a2
b2
c2
a3
b3
c3
a4
b4
c4
a5
b5
c5
a6
b6
c6
a7
b7
c7
I
--
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
Description
APO(Auto Power Off) input
Power Supply
Display Output (Common)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Pin
No.
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Symbol I/O
a8
b8
c8
a9
H2
H3
V
SS
Po
Ti
CGout
CGin
K3
K2
A2
A3
A4
A5
P2
P1
K5
K6
K4
S1
O
O
O
O
O
O
--
O
I
O
I
I
I
O
O
O
O
O
O
I
I
I
I
Description
Display Output (Common)
Display Output (Segment)
Display Output (Segment)
Display Output (Segment)
Display Output (Common)
Display Output (Common)
Ground
Piezo Output
Test Input
Resistor terminal for CG
Resistor terminal for CG
Key input
Key input
Strobe output
Strobe output
Strobe output
Strobe output
Strobe output
Strobe output
Key input
Key input
Key input
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
3
Silan
Semiconductors
FUNCTIONAL DESCRIPTION
1. LCD DISPLAY
Display Format
Numericals Font
SC3423
Sign Font
Memory
minus
Punctuation
Touch tone indicator
Error
LCD Connection
H2 H3 a9 c8 b8 a8 c7 b7 a7 c6 b6 a6 c5 b5 a5 c4 b4 a4 c3 b3 a3 c2 b2 a2 c1 b1 a1 H1
LCD Driving System
1/2 bias, 1/3 duty
Display Configuration
Segment Electrode Side
a9
c8
a8
b8
c7
a7
b7
c6
a6
b6
c5
a5
b5
c4
a4
b4
c3
a3
b3
c2
a2
b2
c1
a1
b1
Common Electrode Side
H1
H2
H3
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
4
Silan
Semiconductors
Display Example
No. “8” ON OR OFF WAVEFORM
T1
V2
H3 V1
V0
V2
V1
H2
V0
V2
V1
H1 V0
V2
ai
V1
V0
V2
bi
V1
"ON" V0
ci
V2
V1
V0
"OFF"
ai.bi.ci
V2
V1
V0
a
b
c
"OFF"
ai.bi.ci
bi
V1
"ON" V0
ci
V2
V1
V0
V2
V1
V0
a
b
ai
H2
V0
V2
V1
H1 V0
V2
V1
V0
V2
T2
T3
T4
T5
T6
V2
H3 V1
V0
V2
V1
SC3423
No. “5” ON OR OFF WAVEFORM
T1
T2
T3
T4
T5
T6
c
(H1 H2 H3) (H1 H2 H3) (H1 H2 H3)
H3) (H1 H2 H3)
0
0
0
0
1
1
1
1
1
0
1
0
1
1
1
(H1 H2 H3) (H1 H2
1
1
1
2. KEYBOARD DESCRIPTIONS
a)
Equal Key (=)
i) Performs Keyed-in operation and maintains that operation for possible use.
ii) Establishes power/reciprocation calculation.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
5
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