HI-8040
September 1999
GENERAL DESCRIPTION
The HI-8040 is a CMOS integrated circuit designed for high
voltage LCD display drive applications. It can drive 85
segments at voltages between +5 and -30 volts. An optional
negative converter can generate the negative display drive
voltage. Test inputs facilitate opens and shorts testing. The
backplane frequency is checked and, as long as power is
available, the segments are shut "Off" if the frequency
becomes too low.
The HI-8040 is part of a family of display drivers which
control segment information in the same way. Data is
serially clocked into the device and the data for all segment
outputs are latched in parallel when the Load input
transitions from high to low. With the Data Out from the shift
register available, devices may be cascaded to obtain more
segment outputs. The shift register is 85 bits long.
The die is metal mask programmable to provide for various
package and/or cascade tap options. Consult your Holt
Sales representative to explore the possibilities.
APPLICATIONS
!
Dichroic Liquid Crystal Displays
!
Standard Liquid Crystal Displays
PIN CONFIGURATION
(Top View)
S60
S61
S62
S63
S64
S65
S66
S67
S68
S69
S70
S71
S72
S73
S74
S75
S76
S77
S78
S79
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
100 PIN QUAD CERPACK
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
S29
S28
S27
S26
S25
S24
S23
S22
S21
S20
S19
S18
S17
S16
S15
S14
S13
S12
S11
S10
See page 3-19 for magnified view
FEATURES
!
4 MHz serial input data rate
!
85 segment outputs
!
Cascadable
!
5 Volt inputs translated to 35 Volts
!
T
est pins allow hardware all "ON", all "OFF" or
alternating
!
Monitors backplane oscillation and forces all
segments to "OFF" condition if below 10Hz
!
Negative voltage converter available on-chip
!
CMOS low power
!
Military processing available
FUNCTIONAL BLOCK DIAGRAM
DIN
CL
CS
LD
BPOSC
BPIN
Þ
Þ
Þ
DATA IN
85 Stage
Shift Register
CLK
DOUT
85
LE
Þ
Þ
Þ
85 Bit Latch
Oscillator
Divider
Voltage
Translator
H i g h Voltage
Buffer
Voltage
Translators
H i g h Voltage
Drivers
Þ
BP
85 SEGMENTS
(DS8040 Rev. NEW)
HOLT INTEGRATED CIRCUITS
3-15
9/99
HOLTIC [ HOLT INTEGRATED CIRCUITS ]
