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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
VDD - VSS VIN Rf TSTG TOPT
Value
-0.3 ~ +3.5 -0.3 ~ VDD + 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
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PAD ASSIGNMENT
S1 S2 VDD H1 a1 b1 c1 a2 b2 c2 a3 b3 CGIN 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 VSS 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 VDD in the PCB layout artwork.
ELECTRICAL CHARACTERISTICS (Ta=25C, 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 )
Symbo l
VIH1 VIL1 VIH2 VIL2 IIH1 IIL1 IIH2 IIL2 IIH3 IIL3 IIH3 IIL3 VOL1 VOA VOB VOC FD IOL IOH IDD
Test conditions
Min
VDD-0.4 -VDD-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 A A A A V
VIN=VDD VIN=0V VIN=VDD VIN=0V VIN=VDD VIN=0V VIN=VDD VIN=0V IOUT=15A without load without load without load VDD=3V, display on, Rf=560k VDD=3V, VOL=0.5V,TI=3V VDD=3V, VOH=2.5V,TI=0V Display off, ( Note: 9 ) S2=VSS S2= VDD
-----5 20 -VDD - 0.15 -2.80 1.30 -50 1.0 1.0 ---
VOH1 without load
Output Voltage 2 ( Note: 8 ) Display Frequency ( Note: 8 ) Touch Tone Output Drive Current ( Note: 11 ) Dissipation Current
V Hz mA A
VDD1 VDD=3V, display on, ( Note: 10 )
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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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 and while key is not being depressed. 11. Applies to PO
SC3423
32 2
SC3423
VSS 34 35
1 47
A +
VDD
IDD Test Circuit
Rf=560k +/- 5%
VSS
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 VDD 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 VSS 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
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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
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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
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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 (%)
SC3423
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.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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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)
SC3423
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:
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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Silan 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
Rev: 1.0 2000.12.31
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5. ARITHMETIC OPERATIONS Entry Key Operation
1 2 3 4 5 6 7 9 8 0
SC3423
Display
12345678.
Four Fundamental Arithmetic Calculations
a+b= a b=
a+b a-b a a b b
axb= a b=
Square Root Calculations
a a +/ON/AC ax b = a
a 0E 0 b b
Percent Calculations
axb% + =
a a+ a a 100 a+ a
k k a/k c/k k k 100 100 a+ b+ a b -
b/100 a b/100 b/100 a b/100 a/b a b/100 a b/100
b c
axb= a = b%
a+b% a b%
-
Constant Calculations
k
xb= c=
a
k= c=
k
xb% c%
b/100 c/100 a/k c/k k k k k
a
k% c%
a+k= c= a k= c=
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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Key Operation Repeated Calculations
a+b= a a a b= b= xb= = = = =
SC3423
Display
a + 2b a - 2b (a/b)/b (a b) b
Memory
Power Calculations
ax x ax
= = = = =
a2 a4 a3 (a b) b 1/a =
c d=
axb= a a
Mixed Calculations at |(a+b)C(c/d)Ce|>10 8
a+b
= =
x
1/a2
(a+b) c/d ((a+b) c/d) e/10 8E ((a+b) c/d) e/10 8
xe= CE/C
Memory Calculations at |(a+b)C(c/d)Ce|>10 8
a M+ b MRM CM a + b M+ c x d M+ RM e M+ CE/E RM
aM bM a - bM a-b a + bM c dM a+b+c dM 0M E 0M a+b+c dM
a a-b a-b 0 a+b a+b+c d a+b+c d a+b+c d a+b+c d a+b+c d
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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Silan Semiconductors
APPLICATION CIRCUITS
SC3423
H2
H3
b7
a7
b6
a6
b5
a5
b4
a4
23 22 21 20 19 18 17 16 15 14 13 12 11 c7 a8 b8 c8 a9 H2 H3 VSS PO C9011 BEZZ +3V Ti 24 25 26 27 28 29 30 31 32 33 10 9 8 7 6 a3 c2 b2 a2 c1 b1 a1 H1 VDD S2 S1 47f VDD +3V
SC3423
35 36 37 38 39 40 41 42 43 44 45 46 CGIN K3 K2 A2 A3 A4 A5 P2 P1 K5 K6 K4 Auto Power Off Condition Pin S1 APO Enable L H APO Disable H L
b3
c6
c5
c4
c3
5 4 3 2 1 47
H1
a9
b8
a8
b7
a7
b6
a6
b5
a5
b4
a4
b3
a3
b2
a2
b1
a1
c8
c7
c6
c5
c4
c3
c2
c1
3 2 1
6 5 4
9 8 CM
+ CE MRM %
x
ON/C
S2
OFF M+ +/=
ON/CE
0
RCM
7
Note:
1. The Pad 34 (CGout) 2. While using
is deleted
in SC3423 die.
SC3425, please connect a 560kf5% resistor between Pad 34 and Pad 35.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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Silan Semiconductors
CHIP TOPOGRAPHY
SC3423
CGI N 35
K4 46 S1 S2 VDD H1 a1 b1 c1 a2 b2 c2 a3 b3 47 1 2 3 4 5 6 7 8 9 10 11
K6 45
K5 44
P1 43
P2 42
A5 41
A4 40
A3 39
A2 38
K2 37
K3 36
33 32 31 30 29 28 27 26 25 24 12 c3 13 a4 14 b4 15 c4 16 a5 17 b5 18 c5 19 a6 20 b6 21 c6 22 a7 23
Ti Po VSS H3 H2 a9 c8 b8 a8 c7 b7
Chip Size : 1.630 x 1.640 (mm 2 )
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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PAD COORDINATES (Unit: m)
SC3423
(SC3423)
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
S2 VDD H1 a1 b1 c1 a2 b2 c2 a3 b3 c3 a4 b4 c4 a5 b5 c5 a6 b6 c6 a7 b7 c7
X
-755 -755 -755 -755 -755 -755 -755 -755 -755 -755 -755 -630 -505 -380 -255 -125 -0 125 250 375 505 630 755 755
Y
505 380 255 130 0 -125 -250 -375 -500 -630 -765 -765 -765 -765 -765 -765 -765 -765 -765 -765 -765 -765 -755 -625
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
a8 b8 c8 a9 H2 H3 VSS Po Ti CGout CGin K3 K2 A2 A3 A4 A5 P2 P1 K5 K6 K4 S1
X
755 755 755 755 755 755 755 755 755
Y
-500 -375 -250 -120 5 130 255 380 510
665 540 415 285 160 35 -90 -215 -340 -470 -595 -755 -755
760 760 760 760 760 760 760 760 760 760 760 760 630
Note: The original point of the coordinate is the die center.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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