ROHM BU9706KS Datasheet
1
Standard ICs
LCD segment driver
BU9706KS
The BU9706KS is a 40-output LCD segment driver provided with a 40-bit shift register and a 40-bit latch.
As the 40-bit shift register can be divided into two 20-bit sections, it can be used efficiently, based on the number of
segments and the character configuration.
Also, by using a number of BU9706KS drivers, it is possible to configure an LCD segment driver of more than 80
bits.
As the liquid crystal drive voltage can be set externally to any value, it can be used as a driver IC for both static and
dynamic drive in various types of liquid crystal display panels.
•
Features
1) 40-bit shift register and 40-bit latch enable serial
input - parallel output.
2) Shift register can be divided into two 20-bit sections.
3) Power supply voltage: 3.5 to 6V.
4) LCD drive voltage: 3 to 6V.
5) Can accommodates duty of 1 / 8 to 1 / 16.
6) Can be used as a driver IC for static drive by setting
the liquid crystal drive voltage externally (V3 = V
DD,
V2 = V5 = V
SS, connect DF as LCD common).
•
Block diagram
40
20 20
D
CK
D
CK
54 55
DO
20
1
4
DO
40
O38
3
O
39
2
O
40
41
49
O
1
VDD
43
V
2
44
V
3
45
V
5
51
DF
47
LOAD
53
DI
I
48
CP
42
V
SS
40
O
2
39
O
3
DI21
LCD Dr
40 bit Latch
20 bit SHIFT REGISTER
20-bit SHIFT REGISTER
2
Standard ICs BU9706KS
•
Absolute maximum ratings (Ta = 25°C, VSS = 0V)
∗ The LCD power supply voltage must satisfy the condition of VDD > V2 ⭌ V3 > V5 ⭌ VSS.
Parameter Symbol Limits Unit
Power supply voltage V
DD V
LCD power supply voltage
∗
VDD – V5 V
Input voltage V
IN VSS – 0.3 ~ VDD + 0.3 V
Power dissipation 500 mW
Operating temperature °C
Storage temperature °C
– 0.3 ~ + 6.5
0 ~ + 6.5
– 20 ~ + 70
– 55 ~ + 125
Pd
Topr
Tstg
•
Recommended operating conditions (Ta = 25°C, VSS = 0V)
∗
The LCD power supply voltage must satisfy the condition of VDD > V2 ⭌ V3 > V5 ⭌ VSS.
Parameter Symbol Min. Typ. Max. Unit
Power supply voltage V
DD 3.5 — 6.0 V
LCD power supply voltage
∗
VDD – V5 3.0 — 6.0 V
Input voltage V
IN 0 — VDD V
•
Pin assignments
43
44
45
46
47
48
49
50
51
52
53
54
55
56
V2
V3
V5
N.C.
LOAD
CP
V
DD
N.C.
DF
N.C.
DI
1
DO20
DI21
N.C.
28
27
26
25
24
23
22
21
20
19
18
17
16
15
O
14
O15
O16
O17
O18
O19
O20
O21
O22
O23
O24
O25
O26
O27
DO40
O40
O39
O38
O37
O36
O35
O34
O33
O32
O31
O30
O29
O28
VSSO1O2O3O4O5O6O7O8O9O10
O11
O12
O13
42 41 40 39 38 37 36 35 34 33 32 31 30 29
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BU9706KS
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