LC7942YC
SANYO Electric Co., Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
63099RM (ID) No. 6159--1/8
Ordering number: EN 6159
s
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft's
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
s
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
CMOS IC
Dot-matrix LCD Driver
Overview
The LC7942YC is a common driver IC for driving large,
dot
matrix LCD displays. It features a built
in 64
bit
bidirectional shift register and a 4
level LCD driver. It can
also be connected in cascade to increase the number of
bits.
The LC7942YC is designed to be used with LC7940YC or
LC7941YC segment drivers to drive large LCD panels.
Features
64 built
in LCD display drive circuits
l/64 to 1/128 display duty cycle
Input/outputs for cascade connection
Bias supply voltages can be supplied externally
Operating supply voltage and ambient temperature
- 2.7 to 5.5V logic supply (V
DD
) at Ta =
20 to +85 C
- 8 to 20 V LCD supply (V
DD
V
EE
) at Ta =
20 to
+85 C
CMOS process
LC7942YC
No. 6159--2/8
Pad Layout (Top view)
Block Diagram
O24
O23
O22
O21
O20
O19
O18
O17
O16
O15
O14
O13
O12
O11
O10
O9
O8
O7
O6
O5
O4
O3
O2
O1
O41
O42
O43
O44
O45
O46
O47
O48
O49
O50
O51
O52
O53
O54
O55
O56
O57
O58
O59
O60
O61
O62
O63
O64
O40
O39
O38
O37
O36
O35
O34
O33
O32
O31
O30
O29
O28
O27
O26
O25
DIO64
VEE
V5
M
CP
DIO1
V2
V1
DISPOFF
VDD
RS/LS
VSS
LC7942YC
4 Level LCD Drive Circuit
(64 bits)
Level Shifter (64 bits)
V1
01
02
03
063 064
V2
V5
M
DISP OFF
DIO1
CP
V
SS
DIO64
RS/LS
I/O
I/O
V
DD
V
EE
Bidirectional
Shift Register
(64 bits)
LC7942YC
No. 6159--3/8
LC7942YC Pad Location
chip size : 3.200 mm x 3.970 mm
Pin_No.
Name
X
Y
Pin_No.
Name
X
Y
41
O1
-1425.9
1808
11
O51
1425.9
-213
42
O2
-1425.9
1635
12
O52
1425.9
-70
43
O3
-1425.9
1465
13
O53
1425.9
70
44
O4
-1425.9
1298
14
O54
1425.9
213
45
O5
-1425.9
1134
15
O55
1425.9
359
46
O6
-1425.9
973
16
O56
1425.9
508
47
O7
-1425.9
815
17
O57
1425.9
660
48
O8
-1425.9
660
18
O58
1425.9
815
49
O9
-1425.9
508
19
O59
1425.9
973
50
O10
-1425.9
359
20
O60
1425.9
1134
51
O11
-1425.9
213
21
O61
1425.9
1298
52
O12
-1425.9
70
22
O62
1425.9
1465
53
O13
-1425.9
-70
23
O63
1425.9
1635
54
O14
-1425.9
-213
24
O64
1425.9
1808
55
O15
-1425.9
-359
25
DIO64
1096
1768
56
O16
-1425.9
-508
26
---
---
---
57
O17
-1425.9
-660
27
V
EE
880
1728
58
O18
-1425.9
-815
28
V
5
689
1728
59
O19
-1425.9
-973
29
V
2
498
1768
60
O20
-1425.9
-1134
30
V
1
318
1768
61
O21
-1425.9
-1298
31
DISPOFF
143
1768
62
O22
-1425.9
-1465
32
V
DD
-37
1753
63
O23
-1425.9
-1635
33
RS/LS
-213
1753
64
O24
-1425.9
-1808
34
V
SS
-393
1753
65
O25
-1236
-1808
35
---
---
---
66
O26
-1053
-1808
36
M
-598
1768
67
O27
-875
-1808
37
---
---
---
68
O28
-704
-1808
38
CP
-835
1768
69
O29
-538
-1808
39
---
---
---
70
O30
-378
-1808
40
DIO1
-1056
1768
71
O31
-223
-1808
72
O32
-73
-1808
73
O33
73
-1808
74
O34
223
-1808
75
O35
378
-1808
76
O36
538
-1808
77
O37
704
-1808
78
O38
875
-1808
79
O39
1053
-1808
80
O40
1236
-1808
1
O41
1425.9
-1808
2
O42
1425.9
-1635
3
O43
1425.9
-1465
4
O44
1425.9
-1298
5
O45
1425.9
-1134
6
O46
1425.9
-973
7
O47
1425.9
-815
8
O48
1425.9
-660
9
O49
1425.9
-508
10
O50
1425.9
-359
LC7942YC
No. 6159--4/8
Pin Functions
Specifications
The following electrical characteristics apply when sealed in a Sanyo standard QIC-80 package.
Absolute Maximum Ratings
at Ta = 25 2C, V
SS
= 0 V
Note
V
DD
V
1
> V
2
>V
5
> V
EE
Number
Name
I/O
Function
32
V
DD
Supply
V
DD
V
ss
is the logic supply.
V
DD
V
EE
is the LCD supply.
34
V
SS
27
V
EE
30
V
1
Supply
LCD panel drive voltage supplies.
V
1
and V
EE
are selected levels.
V
2
and V
5
are notselected levels.
29
V
2
28
V
5
38
CP
I
Display data input clock (fallingedge trigger).
40
DIO1
I/O
25
DIO64
I/O
33
RS/LS
I
36
M
I
LCD panel drive voltage output alternation control signal.
31
DISP OFF
I
O1 to O64 output control input pins.
41 to 80
O
LCD drive outputs
The output drive level is determined by the display data, M signal and DISPOFF input as show below.
Note
= don't care (tied HIGH or LOW)
O1 to O40
1 to 24
O41 to O64
26
NC
No connection.
35
NC
37
NC
39
NC
Parameter
Symbol
Ratings
Unit
Logic supply voltage
V
DD
max
0.3 to +7.0
V
LCD supply voltage. See note.
V
DD
V
EE
max
0 to 22
V
Input voltage
V
I
max
0.3 to V
DD
+ 0.3
V
Operating temperature range
T
opr
20 to +85
C
Storage temperature range
T
stg
40 to +125
C
RS/LS
DIO1
DIO64 Shift
direction
LOW (rlght shift)
Input
Output
O1
O64
HIGH (left shift)
Output
Input
O64
O1
M
Q
DISPOFF
Output
LOW
LOW
HIGH
V
2
LOW
HIGH
HIGH
V
EE
HIGH
LOW
HIGH
V
5
HIGH
HIGH
HIGH
V
1
LOW
V
1
LC7942YC
No. 6159--5/8
Allowable Operating Ranges
at Ta = 20 to +85 C, V
SS
= 0 V
Notes
1. V
DD
V
1
> V
2
> V
5
> V
EE
2. At turn ON, the LCD supply should be energized after or simultaneously with the logic supply. At turn OFF, the logic supply
should be cut after or simultaneously with the LCD supply.
Electrical Characteristics
at Ta = 25 2 C, V
SS
= 0 V, V
DD
= 2.7 to 5.5 V
Note
V
DE
= V
1
or V
2
or V
5
or V
EE
, V
l
= V
DD
, V
2
= 10/11
(V
DD
V
EE
), V
5
= l/11
(V
DD
V
EE
)
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Logic supply voltage
V
DD
2.7
5.5
V
LCD supply voltage
V
DD
V
EE
See notes 1 and 2.
8
20
V
DIO1, DIO64, CP, M, RS/LS and
DISPOFF HIGHlevel input voltage
V
IH
0.8V
DD
V
DIO1, DIO64, CP, M, RS/LS and
DISPOFF LOWlevel input voltage
V
IL
0.2V
DD
V
CP shift clock frequency
f
CP
1
MHz
CP pulsewidth
t
WC
125
ns
DIO1 and DIO64 to CP setup time
t
SETUP
l00
ns
DIOI and DIOS4 to CP hold time
t
HOLD
l00
ns
CP rise time
t
R
50
ns
CP fall time
t
F
50
ns
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
DIO1, DIO64, CP, M, RS/LS and
DISPOFF HIGHlevel input current
I
IH
V
IN
= V
DD
1
A
DIO1, DIO64, CP, M, RS/LS and
DISPOFF LOWlevel input current
I
IL
V
IN
= V
SS
1
A
DIO1 and DIO64 HIGHlevel output
voltage
V
OH
I
OH
= 400 A
V
DD
0.4
V
DIO1 and DIO64 LOWlevel output
voltage
V
OL
I
OL
= 400 A
0.4
V
O1 to O64 driver ON resistance
R
ON
V
DD
V
EE
= 18 V,
V
DD
V
OL
= 0.25 V,
V
DD
= 4.5 V
1.5
k
V
DD
static supply current
I
DD
V
DD
V
EE
= 18 V,
CP = V
DD
100
A
CP input capacitance
C
I
f
CP
= 1 MHz
5
pF
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