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IZ1278U 10/12-DIGIT SELECTABLE DESK TOP CALCULATOR
The IZ1278 is a single chip CMOS LSI with 10-digit or 12-digit arithmetic operation, 2memory, extraction-of-square-root, percentage, MU calculation and auto power off function, designed for FEM LCD operation with a 1.5V power supply. FUNCTIONS FEATURES
* 10/12 digits selectable display by diode option * Four standard functions (+, -, x, / ) * Memory, GT (grand total) memory calculations * Auto-percentage calculations (add on, discount) * Constant calculations * Square root calculations * Chain calculations * MU calculations * Power calculations * Rough estimate calculations * Change sign * Single chip CMOS construction * Floating point or memory mode (sw selectable) * Fixed point (0,2,3,4) and adding point mode * Rounding switches (rounding up, down and off) * Leading and trailing zero suppression * Punctuation comma display for thousands * LCD direct drive * Over flow indication: "E" * On-chip key board debouncing and encoding * Wide supply voltage range (1.2V ~ 2.0V) * Very low power consumption (7w TYP) * PKG type: 64 QFP and bare chip available * Symbols: GT, M, -, E, K, +, -, x, /
ABSOLUTE MAXIMUM RATINGS ( Ta = 25oC )
Characteristic Terminal Voltage Operating Temperature Storage Temperature Symbol VDD VIN Ta Tstg Value - 0.3 ~ + 2.0 - 0.3 ~ VDD + 0.3 0 ~ + 40 - 55 ~ + 125 Unit V V o C o C
ELECTRICAL CHARACTERISTICS (Ta = 25oC, VDD = 1.5V, VSS = 0V unless otherwise specified)
Characteristic High Input Voltage(K3~K10) (K11~K12) Low Input Voltage (KI) (K3~K12) VOH VOL Rpd1 Rpd2 Rpu1 Rpu2 Rpu3 VOH VOM VOL Vout = 2.7V Vout = 1.2V Vout = 0.3V VDD - 0.2 VSS 0.5 10 145 0.6 250 VCC -0.2 VDD -0.2 VSS 1 17 170 1.2 400 VDD 0.2 1.5 28 195 1.9 550 VCC VDD 0.2 V V V K V V K Symbol VIH VIH VIL Test Condition Min VDD - 0.4 VCC - 0.4 VSS Typ Max VDD VCC 0.4 V Unit V
High Output Voltage(K1~K8) Low Output Voltage(K1~K8) Key Pull Down Resistor Key Pull Up Resistor (KI) (K1 ~ K10) (KI) (K1 ~ K10) (K11 ~ K12) High Output Voltage (LCD, COM) "M" Output Voltage (LCD, COM) Low Output Voltage (LCD,
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IZ1278U
Characteristic COM) OSC Frequency Frame Frequency Operating Voltage Supply Current Fdis Fopr Ff VDD IOFF IDIS IOP Display is off Display is on Operating 4.4 7.0 Stand-by Operating Stand-by 5.4 28.8 56.3 1.2 9.0 48 93.8 1.5 12.6 67.2 131 2.0 1 6.5 15 A Hz V KHz Symbol Test Condition Min Typ Max Unit
FUNCTIONAL DESCRIPTION
Decimal point system Floating point for momentary mode by TAB Selection. Integral number : 10/12 digits leading zero suppression. Zero shift. Symbols display GT : negative number display +, -, x, / : for rules operator K : constant Error detections (Parenthesis is in case of 10 digits) * System errors occur when: 1) The division by zero. 2) The integral part of any memory calculation result exceeds 12(10) digits. 3) The integral part of GT memory contents exceeds 12 (10) digits. * Rough estimate calculation error The integral part of any calculationfour standard functions, percentage, square or power calculations result exceeds 12 digits (10 digits). Error indication * System error M : memory display E : error display - : negative number
Zero is displayed at first-digit and "E" sign is indicated at symbol. * Rough estimate calculation error The high-order 12 digits (10 digits) of any calculation result is indicated together with "E" sign, and the decimal point is displayed at the position corresponding to 10-12 (10-10) of the calculation result also no zero shift is performed. Error release * System error Released by AC, C, CE key. * Rough estimate calculation error AC, C key can release a rough estimate calculation error and can clear calculation result at once, also CE key can just only release error flag `E' at first time and can clear calculation result at second time. Number entry Numericals can be entered up to 12 digits (10 digits). Numericals more then 13 digits (11 digits) are ignored. Memory protection Under any error detection, the memory data before error detection are protected. Memory indication If the memory data is not zero, "M" is indicated at symbol position. AUTO POWER OFF
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IZ1278U
Power turns off after about 5 minutes pass from the last key pressure. SELECTION MODE SWITCH FUNCTION 10-digits/12-digits mode depends on K11 pin, please refer to application circuit. Fixed/floating decimal point mode and ADD2 mode are selection by rounding switch. The rounding switch should be so composed that either one ` 4, 3, 2, 0, ADD2 ` is selected. Fix `F' mode When TAB `F' is selected, both entered numbers and calculation results follow to floating decimal point system. DP I = 0, 2, 3, 4 mode The calculation results follow to fixed decimal point system and I+1 decimal place is counted by TAB `CUT', TAB `UP', TAB `5/4'. Fix `CUT' mode The number of i +1 decimal position is counted as cutting away. Fix `UP' mode The number of i decimal position is counted as added to `1'. Fix `5/4' mode When `+' and `-' operations are performed after a number except decimal point is entered. The calculation is executed as 1/100 value of number being entered.
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IZ1278U
KEY DESCRIPTION
0 ~ 9 00
Numerals input key Decimal point key Clear key Four standard function key Percent key Grand total memory key
Memory add and memory subtract key
.
ON/AC
AC
CE
+
-
x
:
%
GT
M+
M-
MRC
Recall and clear memory Recall memory, clear memory Extraction of square root key
MR
MC
=
Enter key Sign change key Shift Right key
+/-
MU
Mark-up and mark-down key Power off key
OFF
ON/AC: Power ON/All clear (system rest) C: All except memory contents CE: Entry clear such as only the entered data is cleared * Recall the data in GT GT flag is released by AC or C key * When = key is pressed, the result of calculator is added to GT memory automatically
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