T9790U ,CMOS 1 CHIP LSI FOR LCD ELECTRONIC CALCULATORT979OUT0700“The T9790U is a 1 chip microcomputer for 8-digits 1-
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T9790U
CMOS 1 CHIP LSI FOR LCD ELECTRONIC CALCULATOR
TOSHIBA T9790U
TOSHIBA CMOS DIGITAL INTEGRATED CIRCUIT SILICON MONOLITHIC
T9790U
T9790U CMOS 1 CHIP LSI FOR LCD ELECTRONIC CALCULATOR
FEATURES
The T9790U is a 1 chip microcomputer for 8-digits 1-
memory electronic calculator.
T9790U can drive the liquid crystal display(LCD). Single
power supply operation, low power consumption make it
suitable for single battery operated pocketable calculator.
8 digits of data and 1 symbol digit for calculator.
o Algebraic calculation mode.
QFP44-P-1010-0.80
o Punctuation. Weight 1 0.34g (Typ.)
0 Standard 4 functions(+, -, x, =.), mark up percent with automatic add-on/discount, automatic
constant calculations, chain calculations, memory calculations with memory overflow protection.
0 Internal keyboard decoding and denouncing.
0 Complementary output buffer for direct driving of liquid crystal display(LCD : FEM type 3.0V, 1/2
bias, 1/3 duty).
0 Single power supply(1.4V typ.).
0 Quad in line flat package(44 PIN).
0 Very low power consumption (2.66pW typ. at wait).
0 Very wide range of operating voltage(VDD=1.1~1.9V).
. Automatic power off (A time for about 7 min.).
980910EBA2
O TOSHIBA is continually working to improve the quality and the reliability of its products. Nevertheless, semiconductor devices in general can
O The products described in this document are subject to the foreign exchange and foreign trade laws.
o The information contained herein is presented only as a guide for the ap lications of our products. No responsibility is assumed by TOSHIBA
O T e information contained herein is subject to change without notice.
malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing
TOSHIBA products, to observe standards of safety, and to avoid situations in which a malfunction or failure of a TOSHIBA product could cause loss
of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified
operating ranges as set forth in the most recent products specifications. Also, please keep in mind the precautions and conditions set forth in the
TOSHIBA Semiconductor Reliability Handbook.
CORPORATION for any infringements of intellectual property or other rights 0 the third parties which may result from its use. No license is granted
b implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others.
1998-12-02 1/23
TOSHIBA
T9790U
SYSTE M BLOCK DIAGRAM
Battery Type
44 43 42 41 40 39 38 37 36 35 34
" 'sl a x k" J g,' 2' J g k" 5
2 NC NC 32
3 A6 C2 31
4 Be B2 30
5 A T9790U c 29
6 7 1 28
7 c (TOP VIEW) A 27
8 7 1 26
9 A8 com 25
10 B8 COM2 24
11 8 A A 23
NC m t? L t o - NC
U m .1 cu '" o m o '" N m
a > > u u > - Sd st Isl' ls":
12 13 14 15 16 17 18 19 20 21 22
c1=c2 =o.1,uF
Pin Select
tffoN/=ctc:Ei
V Level .._..-. Memor Hold ON
-{ DD y
vss Level ......_. Memory Hold OFF
INPUT capacitrsC400 (pF) at VDD-- 1.4 (V)
Key resistancesC3 (k0) at VDD-- 1.4 (V)
1998-12-02 2/23
TOSHIBA T9790U
Dual Type
44 43 42 41 40 39 38 37 36 35 34
" 'd d? ki' k" J a 2' C? g SP 5
2 A C 32
3 36 32 31
4 c6 A2 30
s A T 9 7 9 o u 29
7 B7 B1 27
8 C7 (TOP VIEW) A1 26
9 A8 com 25
10 8 CO 24
c8 COM3
11 A A 23
NC m 8 L t a F NC
U m .1 cu P Q m o F N m
2 > > u u > r- St St [>4 lg
12 13 14 15 16 17 18 19 20 21 22
dr-, /r.-i'L-i'r=tf-, qt'fur-it'fur+it'foE]C--rf.Tt''fEiC-it't
C1--C2--0APF ON/C/CE
C3--10PF
Pin Select
.{VDD Level .1..... Memory Hold ON
0 vss Level --------- Memory Hold OFF
INPUT capacitrsC400 (pF) at VDD-- 1.4 (V)
Key resistancesC3 (k0) at VDD-- 1.4 (V)
1998-12-02 3/23
TOSHIBA T9790U
Solar Type
44 43 42 41 40 39 38 37 36 35 34
" 'd d? ki' k" J a 2' C? g SP 5
2 NC NC 32
3 A6 C2 31
4 Be Bit 30
5 A T9790U C 29
6 7 1 28
7 B7 B1 27
T PVIEW
8 C7 (TO ) A1 26
9 A8 com 25
10 B8 COM2 24
c8 COM3
11 A A 23
NC m e L t a _ NC
U m .1 cu .- Q m o F N m
2 > > u u > r- St St [>4 lg
12 13 14 15 16 17 18 19 20 21 22
_ g? co Ps Ps rs u: to Id) Ln In In
<2 v m < U m < v m < u
-8- "E1C/lCi"EiClCiCsiCilCi"ElCiCitE]
A A A A A - A A - A A A A
- dr-, /_ th--, dr-, R "r- /- fa "r- dr- th-- "r- "
r z1% OFF m A
C1--C2--thlpF ON/C/CE
C3--10/d'
Pin Select
.{VDD Level ..._.... Memory Hold ON
0 V55 Level --------- Memory Hold OFF
INPUT capacitrsC400 (pF) at VDD-- 1.4 (V)
Key resistancesC3 (k0) at VDD-- 1.4 (V)
1998-12-02 4/23
TOSHIBA
CONNECTION OF LCD
SEGMENT
C8 B8 A8 C7 B7 A7 C6 B6 A6 C5 By A5 C4 B4 A4 C3 B3 A3 C2 Bit A2 C1 B1
COMMON
T9790U
—0 COV|3
KEY LAYOUT
K2 K3 C8 B8 A8 C7 B7 A7 C6 B6 A6 C5 Bs A5 C4
L I I I I I I I I I I I I I
V + / - 9 8 7 6 5 4 3 2 1 O -
A% OFF MC MR M E M - M + % = -: x - + -
VDD K1
ON/C/CE
1998-12-02 5/23
TOSHIBA
T9790U
PIN LAYOUT
NC 1 , NC
A6 2 "
Be 3 U Bit
C6 4 [1 A2
Ay 5 T9790U 29llc1
B7 6 28 UB1
2 , (TOP VIEW) 27 I 2,,,
Ba 9 ' COM2
c8 1 [I COM3
SPECIFICATION OF CALCULATOR
Operational Features
8 digits of data and 1 symbol digit.
Algebraic mode.
Full floating point.
Standard 4 functions +, -, x, .=.
Memory calculation and memory hold.
Delta Percent, mark-up and mark-down functions.
Percent with automatic add-on and discount.
Constant calculation (Automatic constant) .
Chain calculation.
Leading zero suppression.
Trailing zero suppression.
Square root.
Change sign.
1998-12-02 6/23
TOSHIBA T9790U
Capacity of Calculation
(1) Numeral entry 8 digits
(2) Addition/Subtraction 8 digits+ (-) 8 digits=8 digits
(3) Multiplication/Division 8 digitsx (e) 8 digits=8 digits
(4) Memory calculation 8 digits+ (-) 8 digits=8 digits
Display Font
M I’ZI Ct Ll l- C Ct In l:l Cl
E I I I I I I I I I I I I I
Overflow Condition
Clearing
When division by zero is attempted, an overflow condition will result, and error symbol
"E" and a zero are displayed.
When the integer part of result exceeds 8 digits, the display will shown 8 most significant
digits of result divided by 10+8 and "E".
When the integer part of result exceeds 15 digits, display will show a zero and "E".
When the integer part of result in memory register exceeds 8 digits at memory calculation,
display will show a zero and "E", and previous data will be kept in memory register.
When an overflow occurs on the way of add-on/discount calculation, display will show a
zero and "E".
In overflow condition, any operation or numeral entry will be inhibited.
Overflow Condition
The resulting overflow condition can be cleared by depressing ON/C/CE .
At memory overflow condition, depression of or ME after ON/C/CE will recall the
previous memory data.
At the condition of exceeding capacity overflow occurred in chain calculation, depression
of ON/C/CE will reset the error symbol "E", and you can continue the calculation using
the displayed data.
1998-12-02 7/23
TOSHIBA
T9790U
Speed of Calculation
Numeral entry
Addition
Multiplication
Division
Memory Calculation
Percentage calculation
Square root
Arithmetic Operations
l. Addition
2. Subtraction
99999999 El
99999999 El
11111111 El
99999999 E
Key Op.
EHmHUEnHwH>
UlIllllnElwlIlZD
56.0--59.3ms
102.6--105.9ms
258.6-261.9ms
294.6-297.9ms
345.3-348.6ms
287.9-291.2ms
259.9--263.2ms
Display
1998-12-02 8/23
TOSHIBA
T9790U
3. Multiplication
4. Division
5. Power calculation
Key Op Display
+/- -D
El A-B-C+D
El -(A-B-C+D)
El A-B
El A-B+C
El -A.B
El A/B
El -A/B
1998-12-02 9/23
TOSHIBA
T9790U
6. Mixed calculation
Key Op.
EIEH>EEE>EEEI>EEEE>EE
omnlwz>
Display
1998-12-02 10/23
TOSHIBA
T9790U
7. Constant calculation
Key Op.
wH>El0mnmwm>lflnlflwl>mmnmwa>
1998-12-02 11/23
TOSHIBA
T9790U
Key Op.
E-EIEGEmlEmEUEOEWI>EnEWE>EOE
1998-12-02 12/23
TOSHIBA
T9790U
8. Mark-up/Discount calculator
Key Op.
mEmEUEnEwEID
mlgwl>mmwl>mlwz>
Display
A-B / 100
A-C / 100
100-D/ E
100~F/E
A-B/100
JVB/100
A+A-B/100
1998-12-02 13/23
TOSHIBA
T9790U
9. Memory calculation
Key Op.
M5 or-
ME 0r-
Key Op.
wE>£wl>EEEwE>
Display
A + B - C (M)
A+B(M)
Display
A-B/100
A.B/100
A -A-B/100
A+AB/1OO
A-AB/100
Memory
1998-12-02 14/23
TOSHIBA
Key Op.
EmE>mfiominmwa>Eéfioaniwn>fini
Display
A + B (M)
A + B (M)
A-B (M)
CD (M)
A-B - CD (M)
JVB - CD
AC (M)
JVD (M)
A + B (M)
T9790U
Memory
2 (A + B)
2 (A + B)
2 (A + B) - C
AB - CD
AB - CD
nnnPPPPPP
1998-12-02 15/23
TOSHIBA
10.Square root
(6) 1.0000001
HE>EEWHI>EHUUI>WH>
Display
A + B (M)
A+B(M)
(A + B)2 (M)
(A + B)2 + C (M)
1.0000001 (M)
99999999. (M)
0. (M)
1.0000001(M)
Memory
T9790U
TOSHIBA T9790U
Key Op. Display Memory
(5) A A O.
A(M) A
M5 or A(M) A
El A(M) A
B B (M) A
- B (M) A
NU!) A
ON/C/CE o. (M) A
11.Percentage calculation
(1) A A
A-B/1oo
% A-C/100
% A-D/1oo
(2) A A
(3) A A
A-NB/100
El A-NB/loo
A-NB/100
1998-12-02 17/23
TOSHIBA T9790U
Key Op. Display Memory
A-B - -litL, <
(s- It), ( 1100 )
12. Key correction
(1) A A 0
El A 0
El A o
x/T o.
A ts/mM) A+\/T
- (A +vrTi) (M) txeslt7
Mg m. A+¢T(M) A+¢T
M2 or A+\/T 0.
B B o.
El B O.
El B 0.
E 1/3 0.
13.0thers
(1) A A
(2) A A
(3) A A
1998-12-02 18/23
TOSHIBA T9790U
Key Op. Display Memory
(4) A A
(5) A A
(6) A A
ON/C/CE o.
(7) A A
14.Delta Percentage key function
(1) A A
(A + B) / 3-100
(2) A A
1998-12-02 19/23
TOSHIBA T9790U
Key Op. Display Memory
A/(1-B/100)
A% lA/(1-B/1tm)-Al
(3) A A
4% A(1+B/100)
(4) A A
A(1-B/100)
Key Chattering Protection
(1) At time of key on : about 6.2--9.5ms, after key input(f¢ typ.)
(2) At time of key off : about 30.8ms, after completion of the operation (f/ typ.)
(3) Simultaneous keying protection.
If 2 or more keys are pressed simultaneously, any key input is not accepted.
1998-12-02 20/23
TOSHIBA T9790U
MAXIMUM RATINGS
PARAMETER SYMBOL RATING UNIT
Supply Voltage VDD - 0.3~ + 2.1 V
Input Voltage VIN -thr-VDD+0.3 V
Operating Temperature Topr 0-40 "C
Storage Temperature Tstg - 55--125 °C
ELECTRICAL CHARACTERISTICS (VDD= 1.4Vi0.2V, VSS=OV, Ta =25°C)
TEST PIN
PARAMETER SYMBOL CIR- TEST CONDITION MIN. TYP. MAX. UNIT
CUIT NAME
Operating Voltage VDD - - - 1.1 1.4 1.9 V
"1" Input Voltage VIH - K1--K3 - 'fle, - VDD v
"o" Input Voltage VIL - Kr-r% - 0 - 0.4 V
" " Segment VDD
1 Output Voltage VOH - Common - -0.2 - VDD V
" " Segment VDD
0 Output Voltage VOL - Common - +0.2 - VDD V
"1" Output Voltage VOH - TZ~T3 - "ee, - VDD
"0" Output Voltage VOL - K1 - 0 - 0.2 V
" " l/SS l/SS
M Output Voltage VOM - Common - +0.2 - -0.2 V
" " VOUT=VDD-0-5V
1 ROH Segment Key Strobe 70
Output Resistance "o" ROL - Segment VOUT=VLCD+0-5V - - 70 k0
"I" ROH - Common l/OUT-O/DD-thw - - 7O
"0" ROL - Common 1/Otrr=VLCD+0.5V - - 70
Output Resistance "M" ROM - Common VOUT=VSS+0-5V - - 10 kn
Key Pull Down
Resistance R pull down - K1 VOUT=VDD 45 80 240 k0
Key Pull up Resistance R pull up - TZ~T3 VOUT=OV 45 80 240 kn
n n . VOUT=V55+0.5V
0 Output Resistance RKEY - Segment Key Strobe - - 10 k0
Input Leakage Current IIL - Ko 0SVINSVDD - - i 1.0 pA
Current Consumption
. I - - V = 1.4V K - 1. . A
(Wait) DDI DD ( ey Open) 9 3.3 ,u
Current Consumption VDD=1.1V
(OP) IDD2 - - (ALL 9,d Peak) - 3.0 4.0 pA
Current Consumption
I OFF - - V =1.4V - - 1.0 A
(OFF) DD DD #
. . f¢ (Wait) VDD f¢ (Typ.) =Wait 4.2 7 9.8
Oscillating Frequency f/ (OP) =1.4v f/ (Typ.) =Operate 10.8 18 25.2 kHz
Frame Frequency fl: - - VDD=1.4V(Wait) 58 97 136 Hz
Power off Timer Timer - - VDD=1.4V 300 420 700 s
1998-12-02 21/23
T9790U
TOSHIBA
WAVEFORMS FOR DISPLAY
: FEM type LCD 3.0V, 1/2 bias, 1/3 duty dynamic system
Display Device
1/(97Hz)*1
D%K D$m
VVV VVV
Ilm ||||||||
3. IIIIIIIIIIII
T IIIIIIIIIIIII
1 2 3 8
M MM J»
O O O 4
C CC C
KEY PULSE OUTPUT
COM1~COM3
I, vss
*2(167 s)
SEGMENT
(*1) hp
(*2) +95
1998-12-02 22/23
T9790U
TOSHIBA
OUTLINE DRAWING
QFP44-P-1010-0.80 Unit : mm
" 12.2w3
1o.ow.2 -
g; FlalilalillilfWlliila "
,,o.151‘3:65
Weight : 0.34g (Typ.)
1998-12-02 23/23
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