TL F 5601
MM58348
High
Voltage
Display
Driver
March 1991
MM58348 High Voltage Display Driver
General Description
The MM58348 is a monolithic MOS integrated circuit utiliz-
ing CMOS metal gate low threshold P and N-channel devic-
es It is available both in 40-pin molded dual-in-line pack-
ages or as dice The MM58348 is particularly suited for driv-
ing high voltage (35V max) vacuum fluorescent (VF) dis-
plays (e g a 5 x 7 dot matrix display)
Features
Y
Direct interface to high voltage display
Y
Serial data input
Y
No external resistors required
Y
Wide display power supply operation
Y
LSTTL compatible inputs
Y
Software compatible with NS display driver family
Y
Compatible with alphanumeric or dot matrix displays
Y
No load signal required
Applications
Y
COPS
TM
or microprocessor-driven displays
Y
Instrumentation readouts
Y
Industrial control indicator
Y
Digital clock thermostat counter voltmeter
Y
Word processor text displays
Y
Automotive dashboards
Block Diagram
TL F 5601 1
FIGURE 1
COPS
TM
is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M105 Printed in U S A
Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Voltage at Any Input Pin
V
DD
a
0 3V to V
SS
b
0 3V
Voltage at Any Display Pin
V
DD
to V
DD
b
36 5V
V
DD
a
l
V
DIS
l
36 5V
Storage Temperature
b
65 C to
a
150 C
Power Dissipation at 25 C
Molded DIP Package Board Mount
2 28W
Molded DIP Package Socket Mount
2 05W
Molded DIP Package Board Mount
i
JA
e
46 C W
Derate 21 7 mW C Above 25 C
Molded DIP Package Socket Mount
i
JA
e
51 C W
Derate 19 6 mW C Above 25 C
Junction Temperature
130 C
Lead Temperature
(Soldering 10 seconds)
260 C
Operating Conditions
Min
Max
Units
Supply Voltage (V
DD
)
V
SS
e
0V
4 5
5 5
V
Display Voltage (V
DIS
)
b
30
b
10
V
Temperature Range
b
40
a
85
C
DC Electrical Characteristics
T
A
e b
40 C to
a
85 C V
DD
e
5V
g
0 5V V
SS
e
0V unless otherwise specified
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
DD
Power Supply Currents
V
IN
e
V
SS
or V
DD
V
DD
e
5 5V
150
m
A
V
SS
e
0V V
DIS
Disconnected
I
DIS
V
DD
e
5 5V V
SS
e
0V
10
mA
V
DIS
e b
30V All Outputs Low
V
IL
Input Logic Levels
0 8
V
DATA IN CLOCK
Logic `0'
V
IH
Logic `1'
2 4
V
I
IN
Input Currents DATA IN CLOCK
V
IN
e
0V or V
DD
b
10
10
m
A
C
IN
Input Capacitance DATA IN CLOCK
15
pF
R
OFF
Display Output Impedances
V
DD
e
5 5V V
SS
e
0V
Output Off
(Figure 3a)
V
DIS
e b
10V
55
250
kX
V
DIS
e b
20V
60
300
kX
V
DIS
e b
30V
65
400
kX
R
ON
Output On
(Figure 3b)
V
DIS
e b
10V
700
800
X
V
DIS
e b
20V
600
750
X
V
DIS
e b
30V
500
680
X
V
DOL
Display Output Low Voltage
V
DD
e
5 5V I
OUT
e
Open Circuit
V
DIS
V
DIS
a
2
V
b
30V
s
V
DIS
s
b
10V
Note 1
74LSTTL V
OH
e
2 7V
I
OUT
e b
400 mA TTL V
OH
e
2 4V
I
OUT
e b
400 mA
AC Electrical Characteristic
T
A
e b
40 C to
a
85 C V
DD
e
5V
g
0 5V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
f
C
Clock Input Frequency
(
Notes 2 and 3 )
1 0
MHz
t
H
Clock Input High Time
300
ns
t
L
Clock Input Low Time
300
ns
t
DS
Data Input Set-Up Time
100
ns
t
DH
Data Input Hold Time
100
ns
Note 2
AC input waveform specification for test purpose t
r
s
20 ns t
f
s
20 ns f
e
1 MHz 50%
g
10% duty cycle
Note 3
Clock input rise and fall times must not exceed 5 ms
2
Connection Diagrams
Dual-In-Line Package
TL F 5601 2
Top View
FIGURE 2
Order Number MM58348N
See NS Package Number N40A
Plastic Chip Carrier
TL F 5601 8
Top View
Order Number MM58348V
See NS Package Number V44A
Functional Description
This product is specifically designed to drive multiplexed or
non-multiplexed high voltage alphanumeric or dot matrix
vacuum fluorescent (VF) displays Character generation is
done externally in the microprocessor with a serial data
path to the display driver The MM58348 uses two signals
DATA IN and CLOCK with a format of a leading ``1'' fol-
lowed by the 35 data bits hence allowing data transfer with-
out an additional signal A block diagram of the MM58348 is
shown in
Figure 1
Figure 2 shows the pinout of the MM58348 device where
output 1 (pin 18) is equivalent to bit 1 (i e the first bit of
data to be loaded into the shift register following the start
bit) A logic ``1'' at the input will turn on the corresponding
display digit segment dot output
A significant reduction in discrete board components can be
achieved by use of the MM58348 because external pull-
down resistors are not required Due to the nature of the
output stage both its on and off impedance values vary as a
function of the display voltage applied However
Figure 3a
and
3b show that this output impedance will remain con-
stant for a fixed value of display voltage
TL F 5601 3
FIGURE 3a Output Impedance Off
TL F 5601 4
FIGURE 3b Output Impedance On
3
Functional Description
(Continued)
Figure 4 demonstrates the critical timing requirements be-
tween CLOCK and DATA IN for the MM58348
In
Figure 5 a start bit of logic ``1'' precedes the 35 bits of
data each bit being accepted on the rising edge of CLOCK
i e a ``0'' ``1'' transition At the 36th clock a LOAD signal
is generated synchronously with the high state of the clock
thus loading the 35 bits of the shift register into the latches
At the low state of the clock a RESET signal is generated
clearing all bits of the shift register for the next set of data
Hence a complete set of 36 clock pulses is needed to clear
(reset) the display driver at ``power on'' or any time the
following flushing routine may be used Clock in 36 ``ze-
roes'' followed by a ``one'' (start bit) followed by 35 ``ze-
roes'' This procedure will completely blank the display It is
recommended to clear the driver at power on
Figure 6 shows a schematic diagram of a microprocessor-
based system where the MM58348 is used to provide the
anode drive for a 32-digit 5 x 7 dot matrix vacuum fluores-
cent (VF) display The grid drive in this example is provided
by another member of the high voltage display driver family
namely the MM58341 which has the additional features of
a BLANKING CONTROL pin a DATA OUT pin and an EN-
ABLE (external load signal) pin
Timing Diagrams
TL F 5601 5
For the purpose of AC measurement V
IH
e
2 4V V
IL
e
0 8V
FIGURE 4 Clock and Data Timings
TL F 5601 6
FIGURE 5 MM58348 Timings (Data Format)
4
Typical Application
TL F 5601 7
FIGURE 6 Microprocessor-Controlled Word Processor
Physical Dimensions
inches (millimeters)
Molded Dual-In-Line Package (N)
Order Number MM58348N
NS Package Number N40A
5
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