IZ1278 single chip CMOS with 10-digit 12-digit arithmetic operation, 2

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IZ1278 single chip CMOS with 10-digit 12-digit arithmetic operation, 2

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IZ1278U 10/12-DIGIT SELECTABLE DESK CALCULATOR
IZ1278 single chip CMOS with 10-digit 12-digit arithmetic operation, 2memory, extraction-of-square-root, percentage, calculation auto power function, designed operation with 1.5V power supply. FUNCTIONS FEATURES
10/12 digits selectable display diode option Four standard functions Memory, (grand total) memory calculations Auto-percentage calculations (add discount) Constant calculations Square root calculations Chain calculations calculations Power calculations Rough estimate calculations Change sign Single chip CMOS construction Floating point memory mode selectable) Fixed point (0,2,3,4) adding point mode Rounding switches (rounding down off) Leading trailing zero suppression Punctuation comma display thousands direct drive Over flow indication: On-chip board debouncing encoding Wide supply voltage range (1.2V 2.0V) Very power consumption (7µw TYP) type: bare chip available Symbols:
ABSOLUTE MAXIMUM RATINGS 25oC
Characteristic Terminal Voltage Operating Temperature Storage Temperature Symbol Tstg Value Unit
ELECTRICAL CHARACTERISTICS 25oC, 1.5V, unless otherwise specified)
Characteristic High Input Voltage(K3~K10) (K11~K12) Input Voltage (KI) (K3~K12) Rpd1 Rpd2 Rpu1 Rpu2 Rpu3 Vout 2.7V Vout 1.2V Vout 0.3V -0.2 -0.2 Symbol Test Condition Unit
High Output Voltage(K1~K8) Output Voltage(K1~K8) Pull Down Resistor Pull Resistor (KI) K10) (KI) K10) (K11 K12) High Output Voltage (LCD, COM) Output Voltage (LCD, COM) Output Voltage (LCD,
IZ1278U
Characteristic COM) Frequency Frame Frequency Operating Voltage Supply Current Fdis Fopr IOFF IDIS Display Display Operating Stand-by Operating Stand-by 28.8 56.3 93.8 12.6 67.2 Symbol Test Condition Unit
FUNCTIONAL DESCRIPTION
Decimal point system Floating point momentary mode Selection. Integral number 10/12 digits leading zero suppression. Zero shift. Symbols display negative number display rules operator constant Error detections (Parenthesis case digits) System errors occur when: division zero. integral part memory calculation result exceeds 12(10) digits. integral part memory contents exceeds (10) digits. Rough estimate calculation error integral part calculationfour standard functions, percentage, square power calculations result exceeds digits digits). Error indication System error memory display error display negative number
Zero displayed first-digit sign indicated symbol. Rough estimate calculation error high-order digits digits) calculation result indicated together with sign, decimal point displayed position corresponding 10-12 (10-10) calculation result also zero shift performed. Error release System error Released key. Rough estimate calculation error release rough estimate calculation error clear calculation result once, also just only release error flag first time clear calculation result second time. Number entry Numericals entered digits digits). Numericals more then digits digits) ignored. Memory protection Under error detection, memory data before error detection protected. Memory indication memory data zero, indicated symbol position. AUTO POWER
IZ1278U
Power turns after about minutes pass from last pressure. SELECTION MODE SWITCH FUNCTION 10-digits/12-digits mode depends pin, please refer application circuit. Fixed/floating decimal point mode ADD2 mode selection rounding switch. rounding switch should composed that either ADD2 selected. mode When selected, both entered numbers calculation results follow floating decimal point system. mode calculation results follow fixed decimal point system decimal place counted `CUT', `UP', `5/4'. `CUT' mode number decimal position counted cutting away. `UP' mode number decimal position counted added `1'. `5/4' mode When operations performed after number except decimal point entered. calculation executed 1/100 value number being entered.
IZ1278U
DESCRIPTION
Numerals input Decimal point Clear Four standard function Percent Grand total memory
Memory memory subtract
ON/AC
Recall clear memory Recall memory, clear memory Extraction square root
Enter Sign change Shift Right
Mark-up mark-down Power
ON/AC: Power ON/All clear (system rest) except memory contents Entry clear such only entered data cleared Recall data flag released When pressed, result calculator added memory automatically

IZ1278 single chip CMOS with 10-digit 12-digit arithmetic operation, 2

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