Silan
Semiconductors SC3423
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.
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
SC3423 chip topography
* Number of digits - 8 digits (rough estimated calculation is possible).
* Calculations:
- Standard four functions (+ , - , x , +).
* Display format: 8 digits & sign (-, E & M)
- Chain multiplication and division.
- Auto-constant calculation (constant multiplicand, divisor,
leading zero suppression
zero shift.
* Touch tone function and display.
addend and subtrahend).
* Punctuation comma display.
- Square and reciprocal calculations.
* Auto power off ability.
- Extraction of square root.
- Percentage calculations.
ORDERING INFORMATIOM
- Power calculations.
- Rough estimate calculations.
SC3423
Has on Chip Oscillator Resistor
- Memory calculations.
SC3424
Pinning Mirrored Type of SC3423
* Decimal point system-complete floating decimal point system.
SC3425
No Oscillator Resistor
* Negative number indication: number + minus (-) sign.
SC3426
Pinning Mirrored Type of SC3425
ABSOLUTE MAXIMUM RATING
Characteristic
Symbol
Value
Unit
VDD - VSS
-0.3 ~ +3.5
V
VIN
-0.3 ~ VDD + 0.3
V
Rf
5605%
K
Storage temperature
TSTG
-55 ~ +125
°C
Operating Temperature
TOPT
0 ~ + 50
°C
Supply Voltage
Input Voltage
(Note: 1)
Resistance for CG
(Note: 2)
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.
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2000.12.31
K3
CGIN
A2
K2
A3
A4
P2
A5
P1
K5
K4
PAD
ASSIGNMENT
K6
SC3423
46 45 44 43 42 41 40 39 38 37 36 35
S1
47
S2
1
VDD
H1
2
a1
4
b1
5
c1
6
a2
7
b2
8
3
SC3423
c6
33
Ti
32
Po
31
VSS
30
29
H3
H2
28
a9
27
c8
26
b8
25
a8
24
c7
23
b7
a7
b6
a6
c5
b5
a5
b3
11 12 13 14 15 16 17 18 19 20 21 22
c4
9
10
a4
b4
c2
a3
c3
Silan
Semiconductors Note: The IC substrate should be connected to VDD in the PCB layout artwork.
ELECTRICAL CHARACTERISTICS (Ta=25°C, VDD =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 )
Output Voltage 2 ( Note: 8 )
Symbo
l
Test conditions
Min
Typ
Max
VIH1
VDD-0.4
--
--
VIL1
--
--
0.4
VIH2
VDD-0.4
--
--
VIL2
--
--
0.2
IIH1
VIN=VDD
--
--
1
IIL1
VIN=0V
--
5.5
10
IIH2
VIN=VDD
--
--
1
IIL2
VIN=0V
--
--
1
IIH3
VIN=VDD
IIL3
VIN=0V
IIH3
VIN=VDD
IIL3
VIN=0V
S2=VSS
S2= VDD
VOH1 without load
--
--
1
5
10
15
20
30
40
--
--
1
VDD – 0.15
--
--
--
--
0.15
VOL1
IOUT=15µA
VOA
without load
2.80
2.95
--
VOB
without load
1.30
1.50
1.70
VOC
without load
--
0
0.20
Display Frequency ( Note: 8 )
FD
VDD=3V, display on, Rf=560k
50
75
--
Touch Tone Output
Drive Current ( Note: 11 )
IOL
VDD=3V, VOL=0.5V,TI=3V
1.0
1.5
--
IOH
VDD=3V, VOH=2.5V,TI=0V
1.0
1.3
--
IDD
Display off, ( Note: 9 )
--
--
0.1
--
20
30
Dissipation Current
VDD1 VDD=3V, display on, ( Note: 10 )
Unit
V
V
µA
µA
µA
µA
V
V
Hz
mA
µA
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
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Silan
Semiconductors SC3423
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
32
2
SC3423
1
34
VSS
47
35
µA
+
VSS
IDD Test Circuit
VDD
Rf=560k +/- 5%
VOA
OUTPUT
WAVEFORM 1;
Hi
VOB
T
VOC
Fd=1/T
VOA
OUTPUT
WAVEFORM 2
ai, bi, ci
VOC
PIN DESCRIPTION
Pin
No.
Symbol I/O
Description
Pin
No.
Symbol I/O
Description
1
S2
I
APO(Auto Power Off) input
25
a8
O
Display Output (Common)
2
VDD
--
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
Display Output (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
Test Input
9
c2
O
Display Output (Segment)
33
Ti
I
10
a3
O
Display Output (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
Display Output (Segment)
37
K2
I
Key input
14
b4
O
Display Output (Segment)
38
A2
O
Strobe output
15
c4
O
Display Output (Segment)
39
A3
O
Strobe output
16
a5
O
Display Output (Segment)
40
A4
O
Strobe output
17
b5
O
Display Output (Segment)
41
A5
O
Strobe output
18
c5
O
Display Output (Segment)
42
P2
O
Strobe output
19
a6
O
Display Output (Segment)
43
P1
O
Strobe output
20
b6
O
Display Output (Segment)
44
K5
I
Key input
21
c6
O
Display Output (Segment)
45
K6
I
Key input
22
a7
O
Display Output (Segment)
46
K4
I
Key input
23
b7
O
Display Output (Segment)
47
S1
I
24
c7
O
Display Output (Segment)
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
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Silan
Semiconductors SC3423
FUNCTIONAL DESCRIPTION
1. LCD DISPLAY
Display Format
Numericals Font
Sign Font
Memory
minus
Punctuation
Error
Touch tone indicator
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
Common Electrode Side
c7
c6
c5
c4
c3
a1
b1
a2
b2
a3
b3
a4
b4
a5
b5
a6
b6
a7
b7
a8
b8
c2
c1
H1
H2
H3
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Semiconductors SC3423
Display Example
No. “8” ON OR OFF WAVEFORM
T1
T2
T3
T4
T5
No. “5” ON OR OFF WAVEFORM
T6
T1
V2
V2
H3 V1
H3 V1
V0
V0
V2
V2
V1
V0
V2
V2
V1
V1
H1 V0
H1 V0
V2
T5
T6
V2
ai
V1
V0
V1
V0
V2
V2
bi
bi
V1
V1
"ON" V0
"ON" V0
V2
ci
V1
V2
V1
V0
"OFF"
ai.bi.ci
T4
H2
V0
ci
T3
V1
H2
ai
T2
V0
"OFF"
ai.bi.ci
V2
V1
V2
V1
V0
V0
a
b
c
a
b
(H1 H2 H3) (H1 H2 H3) (H1 H2 H3)
c
(H1 H2 H3) (H1 H2
H3) (H1 H2 H3)
0
0
0
0
1
1
1
1
1
0
0
1
1
1
1
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.
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Semiconductors SC3423
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.
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Semiconductors SC3423
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) Touch Tone (
) Key
i) When power is ON, the touchtone function is enable and the beep sound is generated output during
125ms and
sign is displayed on LCD.
ii) Selection of touchtone function is toggled by touchtone key.
iii) Output waveform.
fT=2kHz
VOA
VOC
125ms
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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Semiconductors SC3423
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 cycles)
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.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
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Silan
Semiconductors SC3423
5. ARITHMETIC OPERATIONS
Entry
Key Operation
1
2
3
Display
4
5
6
7
8
9
0
12345678.
Four Fundamental
a + b =
a + b
Arithmetic Calculations
a
a - b
Square Root Calculations
-
b =
a x b =
a
a
a
b =
a
a
0E
+/-
a x
0
b
b
=
a
a x b %
+
b
a
b/100
a + a b/100
=
a x b =
a
-
a
a
=
b/100
- a b/100
100
b %
a/b
a + a b/100
a + b %
Constant Calculations
b
a
ON/AC
Percent Calculations
b
- a b/100
a
-
b %
a
k
x b =
k
b
c =
k
c
k =
a/k
c =
c/k
a
k
x b %
k
b/100
c %
k
c/100
k %
100
a/k
c %
100
c/k
a
a + k =
a +
k
c =
b +
k
k =
a
-
k
c =
b
-
k
a
-
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
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Silan
Semiconductors SC3423
Key Operation
Repeated Calculations
Power Calculations
Display
a + b =
=
a + 2b
a
b =
=
a - 2b
a
b =
=
(a/b)/b
a
x b =
=
(a b) b
-
a x
=
a2
x
=
a4
a x
=
Mixed Calculations
a
=
a
=
a + b
at |(a+b)C(c/d)Ce|>10 8
Memory Calculations
at |(a+b)C(c/d)Ce|>10 8
x
a3
=
a x b =
Memory
=
(a b) b
1/a
1/a2
=
c
d =
(a+b) c/d
x e =
((a+b) c/d) e/10 8E
CE/C
((a+b) c/d) e/10 8
a M+
aM
a
b
M-
bM
a-b
RM
a - bM
a-b
CM
a-b
0
a + b M+
a + bM
a+b
c x d M+
c dM
a+b+c d
a+b+c dM
a+b+c d
0ME
a+b+c d
CE/E
0M
a+b+c d
RM
a+b+c dM
a+b+c d
RM
e M+
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
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Silan
Semiconductors SC3423
a1
H1
b1
c1
a2
a3
b2
b3
b3
c2
c3
c3
a4
a4
b4
b4
c4
a5
b5
c4
c5
b5
a5
a6
c5
b6
a6
b6
c6
a7
b7
c6
c7
a7
a8
b7
c8
b8
a9
H3
H2
APPLICATION CIRCUITS
23 22 21 20 19 18 17 16 15 14 13 12 11
c7
a8
b8
c8
a9
H2
25
9
26
8
27
7
28
6
SC3423
5
30
VSS
PO
Ti
BEZZ
10
29
H3
C9011
24
4
31
3
32
2
33
1
47
+3V
a3
c2
b2
a2
c1
b1
a1
H1
VDD
S2
S1
47µf
VDD +3V
K4
K6
K5
P1
P2
A5
A4
A3
A2
K2
K3
CGIN
35 36 37 38 39 40 41 42 43 44 45 46
Auto Power Off Condition
APO
Enable
APO
Disable
S1
L
H
S2
H
L
Pin
3
6
-
+
2
5
9
CE
1
4
8
M-
M+
CM
RM
+/-
7
%
=
0
Note:
RCM
1. The Pad 34 (CGout)
2. While using
is deleted
x
ON/C
OFF
ON/CE
in SC3423 die.
SC3425, please connect a 560k¡f5% resistor between Pad 34 and Pad 35.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
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Semiconductors SC3423
CHIP TOPOGRAPHY
K4
K6
K5
P1
P2
A5
A4
A3
A2
K2
K3
CGI
N
46
45
44
43
42
41
40
39
38
37
36
35
S1
47
S2
1
33
Ti
VDD
2
32
Po
H1
3
31
VSS
a1
4
30
H3
b1
5
29
H2
c1
6
28
a9
a2
7
27
c8
b2
8
26
b8
c2
9
25
a8
a3
10
24
c7
b3
11
23
b7
12
13
14
15
16
17
18
19
20
21
22
c3
a4
b4
c4
a5
b5
c5
a6
b6
c6
a7
Chip Size : 1.630 x 1.640 (mm 2 )
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Semiconductors SC3423
PAD COORDINATES (Unit: µm)
(SC3423)
Pin
Symbol
X
Y
1
S2
-755
505
2
VDD
-755
3
H1
4
Pin
Symbol
X
Y
25
a8
755
-500
380
26
b8
755
-375
-755
255
27
c8
755
-250
a1
-755
130
28
a9
755
-120
5
b1
-755
0
29
H2
755
5
6
c1
-755
-125
30
H3
755
130
7
a2
-755
-250
31
VSS
755
255
8
b2
-755
-375
32
Po
755
380
9
c2
-755
-500
33
Ti
755
510
10
a3
-755
-630
34
CGout
11
b3
-755
-765
35
CGin
665
760
12
c3
-630
-765
36
K3
540
760
13
a4
-505
-765
37
K2
415
760
14
b4
-380
-765
38
A2
285
760
15
c4
-255
-765
39
A3
160
760
16
a5
-125
-765
40
A4
35
760
17
b5
-0
-765
41
A5
-90
760
18
c5
125
-765
42
P2
-215
760
19
a6
250
-765
43
P1
-340
760
20
b6
375
-765
44
K5
-470
760
21
c6
505
-765
45
K6
-595
760
22
a7
630
-765
46
K4
-755
760
23
b7
755
-755
47
S1
-755
630
24
c7
755
-625
No.
No.
Note: The original point of the coordinate is the die center.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
13
2000.12.31