NSC MM5453N, MM5453V, MM5453VX Datasheet

TL/F/6137

MM5452/MM5453 Liquid Crystal Display Drivers

February 1995

MM5452/MM5453 Liquid Crystal Display Drivers

General Description

The MM5452 is a monolithic integrated circuit utilizing
CMOS metal gate, low threshold enhancement mode devic­es. It is available in a 40-pin molded package. The chip can
drive up to 32 segments of LCD and can be paralleled to
increase this number. The chip is capable of driving a 4 (/2­digit 7-segment display with minimal interface between the
display and the data source.

The MM5452 stores display data in latches after it is
clocked in, and holds the data until new display data is re­ceived.

Features

Y

Serial data input

Y

No load signal required

Y

DATA ENABLE (MM5452)

Y

Wide power supply operation

Y

TTL compatibility

Y

32 or 33 outputs

Y

Alphanumeric and bar graph capability

Y

Cascaded operation capability

Applications

Y

COPSTMor microprocessor displays

Y

Industrial control indicator

Y

Digital clock, thermometer, counter, voltmeter

Y

Instrumentation readouts

Y

Remote displays

Block Diagram

TL/F/6137– 1

FIGURE 1

COPSTMis a trademark of National Semiconductor Corp.

C

1995 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 Pin V

SS

to V

SS

a

10V

Operating Temperature 0§Ctoa70§C

Storage Temperature

b

65§Ctoa150§C

Power Dissipation 300 mW ata70§C

350 mW at

a

25§C

Junction Temperature

a

150§C

Lead Temperature (Soldering, 10 sec.) 300§C

Electrical Characteristics

TAwithin operating range, V

DD

e

3.0V to 10V, V

SS

e

0V, unless otherwise specified

Parameter Conditions Min Typ Max Units

Power Supply 3 10 V

Power Supply Current Excluding Outputs

OSC

e

VSS,BPIN@32 Hz 40 mA

V

DD

e

5V, Open Outputs, No Clock 10 mA

Clock Frequency 500 kHz

Input Voltages

Logical ‘0’ Level V

DD

k

4.75

b

0.3 0.1 V

DD

V

V

DD

t

4.75

b

0.3 0.8 V

Logical ‘1’ Level V

DD

l

5.25 0.8 V

DD

V

DD

V

V

DD

s

5.25 2.0 V

DD

V

Output Current Levels

Segments

Sink V

DD

e

3V, V

OUT

e

0.3V

b

20 mA

Source V

DD

e

3V, V

OUT

e

V

DD

b

0.3V 20 mA

Backplane

Sink V

DD

e

3V, V

OUT

e

0.3V

b

320 mA

Source V

DD

e

3V, V

OUT

e

V

DD

b

0.3V 320 mA

Output Offset Voltage Segment Load 250 pF

g

50 mV

Backplane Load 8750 pF (Note 1)

Clock Input Frequency, f

C

(Notes 2 and 3) 500 kHz

High Time, t

h

950 ns

Low Time, t

l

950 ns

Data Input

Set-Up Time, t

DS

300 ns

Hold Time, t

DH

300 ns

Data Enable Input

100 ns

Set-Up Time, t

DES

Note 1: This parameter is guaranteed (not 100% production tested) over operating temperature and supply voltage ranges. Not to be used in Q.A. testing.

Note 2: AC input waveform for test purpose: t

r

s

20 ns, t

f

s

20 ns, fe500 kHz, 50%g10% duty cycle.

Note 3: Clock input rise and fall times must not exceed 300 ns.

2

Connection Diagrams

Dual-In-Line Package

TL/F/6137– 2

Top View

FIGURE 2a

Plastic Chip Carrier

TL/F/6137– 11

Top View

Dual-In-Line Package

TL/F/6137– 3

Top View

FIGURE 2b

Plastic Chip Carrier

TL/F/6137– 12

Top View

Order Number MM5452N, MM5453N,

MM5452V or MM5453V

See NS Package Number N40A or V44A

Functional Description

The MM5452 is specifically designed to operate 4 (/2-digit 7­segment displays with minimal interface with the display and
the data source. Serial data transfer from the data source to
the display driver is accomplished with 2 signals, serial data
and clock. Since the MM5452 does not contain a character
generator, the formatting of the segment information must
be done prior to inputting the data to the MM5452. Using a
format of a leading ‘‘1’’ followed by the 32 data bits allows
data transfer without an additional load signal. The 32 data

bits are latched after the 36th clock is complete, thus pro­viding non-multiplexed, direct drive to the display. Outputs
change only if the serial data bits differ from the previous
time.

A block diagram is shown in

Figure 1.

For the MM5452 a

DATA ENABLE

is used instead of the 33rd output. If the

DATA ENABLE

signal is not required, the 33rd output can

be brought out. This is the MM5453 device.

3