Datasheet SC3423, SC3424, SC3425, SC3426 Datasheet (SILAN)

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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
47

1
2
3
4
5
6
7
8

9
10
11 12 13 14 15 16 17 18 19 20 21 22

40 37

353638394142434445

33
32
31
30
29
28
27
26
25
24
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.

* 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
SC3424
SC3425
SC3426

SC3423 chip topography

Pinning Mirrored Type of SC3423
No Oscillator Resistor
Pinning Mirrored Type of SC3425

ABSOLUTE MAXIMUM RATING

Characteristic Symbol Value Unit

Supply Voltage V
Input Voltage (Note: 1) V
Resistance for CG (Note: 2) Rf 5605% K
Storage temperature T
Operating Temperature T
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.

DD -VSS

IN

STG
OPT

-0.3 ~ +3.5 V

-0.3~VDD+0.3 V

-55 ~ +125 °C
0~+50 °C

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PAD

ASSIGNMENT

K4K6K5P1P2A5A4

46 45 44 43 42 41 40 39 38 37 36 35
47

S1

1

S2

2

V

DD

3

H1

4

a1

5

b1

6

c1

7

a2

8

b2

9

c2

10

a3

11 14 15 16 17 18 19 20 21 22

12

b3

SC3423

13

c4

c3

a4

b4

Note: The IC substrate should be connected to VDDin the PCB layout artwork.

A3

b5c5a6b6c6

a5

A2

K2

K3

ELECTRICAL CHARACTERISTICS

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 )

Output Voltage 2 ( Note: 8 )

Display Frequency ( Note: 8 ) FDVDD=3V, display on, Rf=560k 50 75 -- Hz

Drive Current ( Note: 11 )
Dissipation Current

Symbo

l

V

IH1

V

IL1

V

IH2

V

IL2

I

IH1VIN=VDD

I

IL1VIN

I

IH2VIN=VDD

I

IL2VIN

I

IH3VIN=VDD

I

IL3VIN

I

IH3VIN=VDD

I

IL3VIN

V

without load VDD–0.15 -- --

OH1

V

OL1IOUT

VOAwithout load 2.80 2.95 -­VOBwithout load 1.30 1.50 1.70
V

without load -- 0 0.20

OC

IOLVDD=3V, VOL=0.5V,TI=3V 1.0 1.5 --Touch ToneOutput

I

OHVDD

I

Display off, ( Note: 9 ) -- -- 0.1

DD

V

DD1VDD

(Ta=25°C, V

=3.0V,Unless otherwise specified)

DD

Test conditions Min Typ Max Unit

VDD-0.4 -- --

-- -- 0.4

VDD-0.4 -- --

-- -- 0.2

-- -- 1

=0V -- 5.5 10

-- -- 1

=0V -- -- 1

-- -- 1
51015

20 30 40

-- -- 1

=0V

=0V

S2=V

S2= V

SS

DD

=15µA----0.15

=3V, VOH=2.5V,TI=0V 1.0 1.3 --

=3V, display on, ( Note: 10 ) -- 20 30

SC3423

IN

CG

33

Ti

32

Po

31

V

SS

30

H3

29

H2

28

a9

27

c8

26

b8

25

a8

24

c7

23

b7

a7

µA

µA

µA

µA

mA

µA

V

V

V

V

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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

OUTPUT

WAVEFORM 1;

32

SC3423

34

V

SS

35

IDDTest Circuit

Rf=560k +/-5%

Hi

and while key is not being depressed.

11.Applies to PO

OUTPUT

WAVEFORM 2

ai, bi, ci

PIN DESCRIPTION

Pin

Symbol I/O Description

No.

1 S2 I APO(Auto Power Off) input 25 a8 O Display Output (Common)
2VDD -- Power Supply 26 b8 O Display Output (Segment)
3 H1 O Display Output (Common) 27 c8 O Display Output (Segment)
4 a1 O Display Output (Segment) 28 a9 O Display Output (Segment)
5 b1 O Display Output (Segment) 29 H2 O DisplayOutput (Common)
6 c1 O Display Output (Segment) 30 H3 O Display Output (Common)
7 a2 O Display Output (Segment) 31 VSS -- Ground
8 b2 O Display Output (Segment) 32 Po O Piezo Output

9 c2 O Display Output (Segment) 33 Ti I Test Input
10 a3 O DisplayOutput (Segment) 34 CGout O Resistor terminal for CG
11 b3 O Display Output (Segment) 35 CGin I Resistor terminal for CG
12 c3 O Display Output (Segment) 36 K3 I Key input
13 a4 O DisplayOutput (Segment) 37 K2 I Keyinput
14 b4 O DisplayOutput (Segment) 38 A2 O Strobe output
15 c4 O Display Output (Segment) 39 A3 O Strobe output
16 a5 O DisplayOutput (Segment) 40 A4 O Strobe output
17 b5 O DisplayOutput (Segment) 41 A5 O Strobe output
18 c5 O Display Output (Segment) 42 P2 O Strobe output
19 a6 O DisplayOutput (Segment) 43 P1 O Strobe output
20 b6 O DisplayOutput (Segment) 44 K5 I Keyinput
21 c6 O Display Output (Segment) 45 K6 I Key input
22 a7 O DisplayOutput (Segment) 46 K4 I Keyinput
23 b7 O DisplayOutput (Segment) 47 S1 I
24 c7 O Display Output (Segment)

Pin

Symbol I/O Description

No.

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SC3423

2
1

47

V

SS

T

Fd=1/T

Rev: 1.0 2000.12.31

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µA

+

V

DD

VOA
VOB
VOC

VOA

VOC

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FUNCTIONAL DESCRIPTION

1. LCD DISPLAY

Display Format
Numericals Font

Sign Font

minus Punctuation Touch tone indicator

LCD Connection

LCD Driving System
1/2 bias, 1/3 duty
Display Configuration
Segment Electrode Side

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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

a9

c8

a8

b8

c7

b7

a7

c6

SC3423

Memory Error

a1

a2

a3

a4

a5

a6

b1

b2

b3

b4

b5

b6

c5

c4

c3

c2

c1

Common Electrode Side

H1
H2

H3

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Display Example

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SC3423

No. “8” ON OR OFF WAVEFORM No. “5” ON OR OFF WAVEFORM

T1 T2 T3 T4 T5 T6

V2
V1

H3

V0
V2
V1

H2

V0
V2
V1

H1

V0
V2

ai

V1
V0
V2

bi

V1

"ON"

V0
V2

ci

V1
V0

"OFF"

V2

ai.bi.ci

V1
V0

abc

(H1H2H3)(H1H2H3)(H1H2H3) (H1H2H3)(H1H2

H3) (H1 H2 H3)

0 1 0 111 111

00 0 111 1 0 1

"ON"

"OFF"
ai.bi.ci

T1 T2 T3 T4 T5 T6

V2
V1

H3

V0
V2
V1

H2

V0
V2
V1

H1

V0
V2

ai

V1
V0
V2

bi

V1
V0
V2

ci

V1
V0
V2
V1
V0

abc

2. KEYBOARD DESCRIPTIONS

a) Equal Key (=)

i) Performs Keyed-in operation and maintains that operation for possible use.
ii) Establishes power/reciprocation calculation.

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b) Multiplication Key (x)

i) Enters multiplicand.
ii) Performs previous operation and displays result.

c) Division Key (÷)

i) Enters dividend.
ii) Performs previous operation and displays result.

d) Addition Key (+)

i) Conditions machine for an addition.
ii) Performs previous operation and displays result.

e) Subtraction Key (-)

i) Conditions machine for a subtraction.
ii) Performs previous operation and displays result.

f) Percent Key (%)

The purpose of the percent key is to allow for calculation of add-on and discount. Deter mination of add-on
requires the principal amount to be the first entry followed by the "+" or "x" key, with the percentage being the
second entry. Depression of the percent key yields the amount to add on, such as tax or interest. Depression
of the "=" key adds this amount to the principal.
g) Change Sign Key (+/-)

Pushing the "+/-" key twice in succession causes the corresponding sign to appear and disappear. During
digit entry; this function changes the sign of the entered factor.
h) Power On/All Clear Key (ON/AC)

i) First push power-on displays "0".

ii) In the middle of a digit entry, a second push will clear all registers and memory.
i) Clear Entry/Clear Key (CE/C)

i) During the digit entry, the first depression will clear the entry register. And display the previous enter

number again.

ii) The second push will clear all registers except memory.
j) Clear Entry Key (CE)

During the digit entry will clear the entry register and display number "0".
k) Square Root Key (

Extracts the square root of a positive number displayed in the entry register.
I) Memory Plus Key (M+)

i) Adds the current display to the contents of memory.

ii) It will terminate a number entry.

)

SC3423

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m) Memory Minus Key (M-)

i) Subtracts the current display from the contents of memory

ii) It will terminate a number entry.
n) Memory Recall and Clear Key (RCM)

i) First push, as RM key, transfers the contents of the memory register into the display register.

ii) Second push, as CM key, clears the memory.
o) Number, Decimal Key ("O - 9", "•")

The First number key in a sequence will clear the display and enter the digit in the display. Successive
entries will shift the display left and enters the data in display register. The first decimal point entered is
effective. An attempted entry of more than 8 digits or 7 decimal places will be ignored.

p) TouchTone (

i) When power is ON, the touchtone function is enable and the beep sound is generated output during

125ms and

ii) Selection of touchtone function is toggled by touchtone key.

iii) Output waveform.

) Key

sign is displayed on LCD.

fT=2kHz

125ms

SC3423

V

OA

V

OC

3. ERROR CONDITIONS

a). Error Detection

System errors occur when:

i) The integral part of any calculation result exceeds 16 digits.

ii) The integral part of any memory calculation result exceeds 8-digit or when the integral part of any addend

or subtrahend to memory exceeds 8-digit.
iii) The integral part of a mark-up and markdown calculation result exceeds 8-digit.
iv) A division by zero is attempted.
v) An extraction of the square root of a negative number is attempted.

Rough Estimate Calculation results occur when:

The integral part of the result of any one of the standard four functions, percentage, square, reciprocal,

and power calculations exceeds 8-digit and is equal to 16-digit or less.

b). Error Indication

i) System error: "0” is indicated in the first-digit position and "E" in the sign-digit position.
ii) Rough Estimate Calculation result:

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The high-order 8-digit of a calculation result is indicated together with "E". The location of the decimal

point corresponds to the result of calculation times le-8, and no zero shift is performed.

c). Error Release

i) System error: A system error can be released by depressing ON/AC key.
ii) Rough Estimate Calculation result: A rough estimate calculation error can be released by depressing the

ON/AC or CE/C key. However the calculation result is not cleared by CE/C key but is retained.

4. OPERATION CHARACTERISTICS

a) Constant Operation

The SC3423 has implied constant mode on +, -, x, ÷, &, % operations. The constant is performed
automatically by the "=" key, "%" key, or "%" key without a constant for addition, subtraction and division
while the first operand is the constant for multiplication.

b) Number Entry

Numbericals can be entered up to 8-digit. Entries equal to 9-digit or more are ignored.

c) Memory Protection

In any error detection, the memory contents present before the error detection are protected.

d) Memory Indication

If the memory contents are a number other than zero, "M" is indicated in the sign-digit position.

e) Auto Power Off

If no key is depressed for a specific period of time, the power supply will automatically turn off. This time
interval up to power-off is 131,072 words (Approximately equal to 14 minutes and 24 seconds at Fd= 52 Hz,
the display time of a word being equal to 6ms when Fd= 52 Hz).

3V

1.5V
0V

1/Fd

(3 Word cycl es)

Output waveform example

f) Double Key Depression

The order of priority, when two keys are depressed simultaneously is as follows :

OFF -> ON/AC -> CE/C -> 5 -> 6 -> 4 -> ROM -> · -> 9

·

x <- <- <-0<-1<- 3<-2<- CM <-7 <- 8 <-- <

·

>M+->=->+/-->CE->+->M-->%-> RM

g) Key Bounce Protection

- Font edge: Down to l word and up to about 3 words.

- Back edge: 14 words.

SC3423

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5. ARITHMETIC OPERATIONS

Entry Key Operation Display

Four Fundamental
Arithmetic Calculations

Square Root Calculations

Percent Calculations

Constant Calculations

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1 2 3 4 5 6 7 8

9 0

+ =ab a+b

- =ab

x =ab

=ab

a

a

+/-

ON/AC

a

x b

=a

x %ab

+ =

x =ab

- =

%ab

+ %ab

- %ab

x =kb

c

=ak

c

=

x %kb

%c

%ak

%c 100 c/k

+ =ak

=cbk+

- =ak

=c

12345678.

a-b

ab

abab

a b/100

a+a b/100

a
a-a b/100

100

a+a b/100

a-a b/100

k

k c=

a/k

c/k

k

k

100 a/k

ak+

ak-

bk-

SC3423

a

0E

0

b

b



b/100



a/b





b

b/100

c/100

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Repeated Calculations

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SC3423

Key Operation Display Memory

+ =ab

=

a2b+

Power Calculations

Mixed Calculations
at |(a+b)C(c/d)Ce|>10

Memory Calculations
at |(a+b)C(c/d)Ce|>10

8

8

- =ab

x =ab =(ab)b

xa =

x =a

xa = =a

=a2b-

=ab

=

(a/b)/b

a

2

4

3

x =ab =(ab)b

a =

a = =

+a x

e

x =

CE/C

M+a

M-b

RM

CM

=bcd

1/a

2

1/a

(a+b) c/d

((a+b)c/d)e/108E

((a+b)c/d)e/10

aM a

bM

a-bM

a-b

8

a-b

a-b

0

+a M+b

xc M+d

RM

M+e

CE/E

RM

a+bM

cdM

a+b+c dM

M

0

E

0M

a+b+c dM

a+b

a+b+c d

a+b+c d

a+b+c d

a+b+c d
a+b+c d

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APPLICATION CIRCUITS

a9

c8

H2

b8a8c7b7a7c6b6a6c5b5a5c4b4a4c3b3a3c2b2a2c1b1a1

H3



SC3423

H1

c4

a5

b5

P2

A5

A4

A3

+- x

C9011

BEZZ

+3V

K3

a6

b6

A2

K2

c5

SC3423

c6

a7

b7

c7

24

a8

25

b8

26

c8

27

a9

28

H2

29

H3

30

SS

V

31

PO

32

Ti

33

IN

CG

63

CE9 OFF52

41

M-8 M+

RMCM +/-

RCM

0

%7 =

Note: 1. The Pad 34 (CGout) is deleted in SC3423 die.

2. While using SC3425, please connect a 560k¡f5% resistor between Pad 34 and Pad 35.

c3

b3

a4

b4

1114151617181920212223

13

12

a3

10

c2

9

b2

8

a2

7

c1

6

b1

5

a1

4

H1

3

V

DD

2

S2
S1

ON/C

ON/CE

47µf

VDD +3V

Auto PowerOff Condition

APO

Pin

S1
S2

APO

Enable

Disable

LH

LH

1
47
464544434241403938373635

K4

K6

K5

P1

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CHIP TOPOGRAPHY

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SC3423

K4S1K6 K5 P1 P2 A5 A4 A3 A2 K2 K3

46
47

S2

1

DD

a1
b1
c1

a2
b2

c2
a3

2
3
4
5
6
7
8
9

10

V

H1

40 37

CGI

N

353638394142434445

33
32
31
30
29
28
27
26
25
24

Ti
Po

V
H3

H2
a9

c8
b8

a8
c7

SS

b3

11

12 13 14 15 16 17 18 19 20 21
c3 a4 b4 c4 a5 b5 c5 a6 b6 c6 a7

22

23

b7

Chip Size : 1.630 x 1.640 (mm2)

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PAD COORDINATES

(Unit: µm)



SC3423

(SC3423)

Pin

Symbol X Y

No.

1S2
2VDD
3H1
4a1
5b1
6c1
7a2
8b2

9c2
10 a3
11 b3
12 c3
13 a4
14 b4
15 c4
16 a5
17 b5
18 c5
19 a6
20 b6
21 c6
22 a7
23 b7
24 c7

Note: The original point of the coordinate is the die center.

-755 505

-755 380

-755 255

-755 130

-755 0

-755 -125

-755 -250

-755 -375

-755 -500

-755 -630

-755 -765

-630 -765

-505 -765

-380 -765

-255 -765

-125 -765

-0 -765
125 -765
250 -765
375 -765
505 -765
630 -765
755 -755
755 -625

Pin

Symbol X Y

No.

25 a8
26 b8
27 c8
28 a9
29 H2
30 H3
31 VSS
32 Po
33 Ti
34 CGout
35 CGin
36 K3
37 K2
38 A2
39 A3
40 A4
41 A5
42 P2
43 P1
44 K5
45 K6
46 K4
47 S1

755 -500
755 -375
755 -250
755 -120
755 5
755 130
755 255
755 380
755 510

665 760
540 760
415 760
285 760
160 760

35 760

-90 760

-215 760

-340 760

-470 760

-595 760

-755 760

-755 630

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