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IZ12291M
1
10-D
IGITS
C
ALCULATOR

The IZ12291M is a single chip CMOS LSI with 10-digit arithmetic operation, single
memory, extraction-of-square-root, percentage calculation, auto power off and punctuation ,
designed for FEM LCD operation with a 1.5V power supply.

FUNCTIONS
Four standard functions (+, -,
,
)
Square and reciprocal calculations
Extraction of square root
Auto constant calculations (constant: multiplicand,
divisor,
addend and subtrahend)
Mark-up and mark-down calculations
Percentage calculations
Chain multiplication and division
Power calculations
Rough estimate calculations
Punctuation comma and touch tone mark display
Clear key: ON/C, CE
FEATURES
Single chip CMOS construction
Floating decimal point
LCD direct drive
Overflow indication: "E"
On chip oscillator components
Auto Power off
Accumulating memory: M+, M-, MR, MC,
MRC
Bare chip is available
Mirror type

LCD CONNECTION
H2
H3
a11
c10
b10
a10
c9
b9
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

ABSOLUTE MAXIMUM RATINGS
( T
a
= 25
o
C )
Characteristic Symbol
Value
Unit
Terminal Voltage
V
CC
- 0.3 ~ + 2.1
V
V
IN
- 0.3 ~ V
CC
+
0.3 V
Operating Temperature
T
a
0 ~ + 50
o
C
Storage Temperature
T
stg
- 55 ~ + 125
o
C

ELECTRICAL CHARACTERISTICS (T
a
= 25
o
C, V
CC
= 1.5V, unless otherwise specified)
Characteristic Symbol
Test
Condition
Min Typ Max Unit
Operating
Voltage
V
OP
1.1
1.5
1.8
V
Input Voltage
V
IH
V
CC
-
0.4
V
(pins FDISB,
EXT)
V
IL
0.4
Input Current 1
I
IH1
V
IN
= V
CC
1
A
(pins FDISB,
EXT)
I
IL1
V
IN
= 0V
1.5
2.5
3
Input Current 2
I
IH2
V
IN
= V
CC
;
APODISB
=
0V
1
A
IZ12291M
2
Characteristic Symbol
Test
Condition
Min Typ Max Unit
(pins K4
K6)
I
IL2
V
IN
= 0V; FDISB = 0V
3
5.5
7.5
Output Voltage
V
OA
Without load
2.80
2.95
(pins a1
a11,
b1
b10,
V
OB
Without
load 1.30
1.50
1.70
V
c1
c10, H1
H3)
V
OC
Without
load 0
0.20
Display
Frequency
F
d
V
CC
= 1.3V, Display is
on
55 75
Hz
Supply Current
I
OFF
Display is off
1
A
I
DIS
V
CC
= 1.3V, Ddisplay is
on
6
10

FUNCTIONAL DESCRIPTION
Decimal point system
Complete floating decimal point system.

Integral number
10 digits leading zero suppression. Zero shift.

Symbols - : negative number display
E : error display
, : punctuation comma

Error detections
System errors occur when:
1) The division by zero.
2) The extraction of square root of a negative number.
3) The integral part of any memory calculation result exceeds 10 digits.
Rough estimate calculation error occur when
The integral part of any calculation - any standard functions, percentage, square root,
reciprocal or power calculations result exceeds 10 digits.

Error indication
System error
"0" is indicated in the 1-digit position and "E" in the sign-digit position.
Rough estimate calculation error
The high-order 10-digit calculation result is indicated together with "E".
The decimal point is indicated if the position corresponding to a calculation result of time 10
-10
,
and no zero shift is performed

Error release
System error
A system error can be release by the ON/C key.
Rough estimate calculation error
ON/C key can release a rough estimate-calculation error and clear calculation result at once. CE
key can release only a rough estimate calculation error ("E" flag).

Number entry
Numericals can be entered up to 10 digits. Numerical entries equal to 11 digits or more are
ignored.
IZ12291M
3
Memory protection
In any error detection, the memory contents present before the error detection are protected.

Memory indication
If the memory content is not zero, "M" is indicated in the sign-digit position.

Key bounce protection
Front edge
Minimum 3 words
Trailing edge
Minimum 16 words
1 word is 3.3ms when display frequency is F
d
= 100Hz.

Auto power OFF
Power automatically turns off after 7 - 8 minutes pass from the last key pressure. By connecting
the APODISB pin to GND or V
CC
, the auto power off function is disabled or enabled, respectively.
,
,
,
H1
H2
H3
H2
H3
,
,
,
,
c10
c9
b9a9 c8
b8a8 c7
b7a7 c6
b6a6 c5
b5a5 c4
b4a4 c3
b3a3 c2
b2a2 c1
b1a1
b10a10





CLEAR KEY DESCRIPTION

ON/C key
Power-on function.
All operations are cleared by the ON/C key (except memory contents).

CE key
CE key can edit the last operand or operator.

MARK-UP AND MARK-DOWN CALCULATION
ENTRY DISPLAY
A A A
A
+/-
A A
B B B
B
% %
A
AM/100
AM/100
+ OR -
AM/100
=
A + AM/100 OR A -
AM/100
Note: AM: AMOUNT
Mirror LCD with IZ12291M
IZ12291M
4

APPLICATION CIRCUIT (mirror LCD)
IZ12291M (CHIP)
21
H
1
9
a1~a7, b1~b7, c1~c7
a8~a11, b8~b10, c8~c10
H2, H3
2
a4
b4
c4
a5
b5
c3
b3
a3
c2
b2
a2
Vcc
Vcc
a10
b10
c10
H
2
H
3
GND
V
C
V
A
V
B
c1
b1 a1 H
1
0.1 F
0.1 F
K
5
K
6
%
7
4
1
2
3
0
5
6
8
9
M+
M-
x
+
MR
a8
a9
a10
b10
c10
b9
c9
b8
c8
.
=
MRC
MC
CE
OFF
+/-
-
.
.
K
4
K
4
K
5
K
6
APO
FD
EXT
ON/C
b9
c9
c5 a6 b6 c6 a7 b7 c7 a8 b8 c8 a9
33 F
+
-
1.5V
ON/C
SB

NOTE1: AUTO POWER OFF CONDITION
SB: Solar Battery
APODISB
V
CC
GND
APO STATE
ENABLE
DISABLE
IZ12291M
5
PAD DIAGRAM
IZ12291M

PAD LOCATION
Pad
No.
Pad
Name
Description
Pad
No.
Pad
Name
Description
Pad
No.
Pad
Name
Description
1
EXT
External Clock
17
c2
Display output
33
a8
Display output
2 FD
F
OSC
Disable
18
a3
Display output
34
b8
Display output
3
K6
Key input
19
b3
Display output
35
c8
Display output
4
K5
Key input
20
c3
Display output
36
a9
Display output
5
K4
Key input
21
a4
Display output
37
b9
Display output
6
ON/C
Key Input
22
b4
Display output
38
c9
Display output
7 V
CC
Power Supply
23
c4
Display output
39
a10
Display output
8 V
OP
Solar battery
24
a5
Display output
40
b10
Display output
9 V
SB
Option Pin
25
b5
Display output
41
c10
Display output
10
APO
APO Disable
26
c5
Display output
42
H3
COM3
11 H1 COM1
27 a6 Display
output 43 H2 COM2
12 a1 Display
output 28 b6 Display
output 44
GND
Ground
13
b1
Display output
29
c6
Display output
45
V
C
Capacitor
terminal
14
c1
Display output
30
a7
Display output
46
V
A
Capacitor
terminal
15 a2 Display
output 31 b7 Display
output 47 V
B
Capacitor
terminal
16
b2
Display output
32
c7
Display output
APO: Output Power OFF