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IZ1278U

型号：

IZ1278U

描述：

10月12日位数字可选择的桌面计算器[ 10/12-DIGIT SELECTABLE DESK TOP CALCULATOR ]

品牌：

INTEGRAL[ INTEGRAL CORP. ]

页数：

4 页

PDF大小：

108 K

下载PDF手册
IZ1278U  
10/12-DIGIT SELECTABLE DESK TOP CALCULATOR  
The IZ1278 is a single chip CMOS LSI with 10-digit or 12-digit arithmetic operation, 2-  
memory, 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 (+, -, ×, ÷ )  
• Memory, GT (grand total) memory calculations  
• Auto-percentage calculations (add on, discount)  
• Constant calculations  
• 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  
• Square root calculations  
• Chain calculations  
• MU calculations  
• Over flow indication: “E”  
• Power calculations  
• On-chip key board debouncing and encoding  
• Wide supply voltage range (1.2V ~ 2.0V)  
• Very low power consumption (7µw TYP)  
• PKG type: 64 QFP and bare chip available  
• Symbols: GT, M, -, E, K, +, -, ×, ÷  
• Rough estimate calculations  
• Change sign  
ABSOLUTE MAXIMUM RATINGS ( Ta = 25oC )  
Characteristic  
Terminal Voltage  
Symbol  
Value  
Unit  
VDD  
VIN  
Ta  
- 0.3 ~ + 2.0  
- 0.3 ~ VDD + 0.3  
0 ~ + 40  
V
V
Operating Temperature  
Storage Temperature  
oC  
oC  
Tstg  
- 55 ~ + 125  
ELECTRICAL CHARACTERISTICS (Ta = 25oC, VDD = 1.5V, VSS = 0V unless otherwise specified)  
Characteristic  
Symbol  
Test Condition  
Min  
Typ  
Max  
Unit  
High Input Voltage(K3~K10)  
(K11~K12)  
VIH  
VIH  
VIL  
VDD - 0.4  
VCC - 0.4  
VSS  
VDD  
VCC  
0.4  
V
Low Input  
Voltage  
(KI)  
(K3~K12)  
V
High Output Voltage(K1~K8)  
Low Output Voltage(K1~K8)  
VOH  
VOL  
Rpd1  
VDD - 0.2  
VSS  
VDD  
0.2  
1.5  
V
V
Key Pull  
Down  
(KI)  
Vout = 0.3V  
0.5  
1
KΩ  
Resistor  
Key Pull Up  
Resistor  
(K1 ~ K10)  
(KI)  
(K1 ~ K10)  
(K11 ~ K12)  
Rpd2  
Rpu1  
Rpu2  
Rpu3  
VOH  
10  
145  
0.6  
17  
28  
195  
1.9  
Vout = 1.2V  
Vout = 2.7V  
170  
1.2  
400  
KΩ  
250  
VCC -0.2  
550  
VCC  
High Output Voltage (LCD,  
COM)  
V
V
V
“M” Output Voltage (LCD,  
COM)  
Low Output Voltage (LCD,  
VOM  
VOL  
VDD -0.2  
VSS  
VDD  
0.2  
1
IZ1278U  
Test Condition  
Characteristic  
Symbol  
Min  
Typ  
Max  
Unit  
COM)  
OSC Frequency  
Fdis  
Fopr  
Ff  
VDD  
IOFF  
IDIS  
IOP  
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
KHz  
Frame Frequency  
Operating Voltage  
Hz  
V
Display is off  
Display is on  
Operating  
Supply Current  
4.4  
7.0  
6.5  
µA  
15  
Zero is displayed at first-digit and “E” sign is  
FUNCTIONAL DESCRIPTION  
indicated at symbol.  
Decimal point system  
• Rough estimate calculation error  
The high-order 12 digits (10 digits) of any  
Floating point for momentary mode by  
TAB Selection.  
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.  
Integral number : 10/12 digits leading  
zero suppression. Zero shift.  
Error release  
Symbols  
M : memory display  
E : error display  
• System error  
- : negative number  
Released by AC, C, CE key.  
display  
display  
GT : negative number  
• 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.  
+, -, ×, ÷ : for rules operator  
K : constant  
Error detections (Parenthesis is in  
case of 10 digits)  
Number entry  
• System errors occur when:  
1) The division by zero.  
Numericals can be entered up to 12 digits (10  
2) The integral part of any memory  
digits).  
calculation result exceeds 12(10) digits.  
Numericals more then 13 digits (11 digits) are  
ignored.  
3) The integral part of GT memory  
contents exceeds 12 (10) digits.  
Memory protection  
• Rough estimate calculation error  
The integral part of any calculation-  
four standard functions, percentage,  
square or power calculations result  
exceeds 12 digits  
Under any error detection, the memory data  
before error detection are protected.  
Memory indication  
(10 digits).  
If the memory data is not zero, “M” is indicated at  
symbol position.  
Error indication  
AUTO POWER OFF  
• System error  
2
IZ1278U  
Power turns off after about 5 minutes  
pass from the last key pressure.  
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’.  
SELECTION MODE SWITCH  
FUNCTION  
Fix ‘CUT’ mode  
10-digits/12-digits mode depends on  
K11 pin, please refer to application  
circuit.  
The number of i +1 decimal position is counted as  
cutting away.  
Fixed/floating decimal point mode and  
ADD2 mode are selection by rounding  
switch.  
Fix ‘UP’ mode  
The number of i decimal position is counted as  
added to ‘1’.  
The rounding switch should be so  
composed that either one ‘ 4, 3, 2, 0,  
ADD2 ‘ is selected.  
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.  
Fix ‘F’ mode  
When TAB ‘F’ is selected, both entered  
numbers and calculation results follow  
to floating decimal point system.  
3
IZ1278U  
KEY DESCRIPTION  
0
~
9
00  
.
Numerals input key  
Decimal point key  
ON/AC  
-
AC  
x
CE  
:
Clear key  
+
Four standard function key  
Percent key  
%
GT  
M-  
MRC  
MC  
Grand total memory key  
Memory add and memory subtract key  
Recall and clear memory  
Recall memory, clear memory  
Extraction of square root key  
Enter key  
M+  
MR  
=
+/-  
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  
4
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