Symbol

Parameter

Conditions

Min

Typ

Max

Units

Enable Input

(Note 5)

t

ES

Set-Up Time

100

ns

t

EH

Hold Time

100

ns

t

CDO

Data Output

C

500

ns

Clock Low to Data Out

Time

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.

Note 2: Molded DIP Package, Board Mount,

Note 3: Molded DIP Package, Socket Mount,

Note 5: For timing purposes, the signals ENABLE and BLANK can be considered to be totally independent of each other.

Note 7: Clock input rise and fall times must not exceed 5 µs.

Connection Diagrams

Plastic Chip Carrier

00792508

Top View

Order Number MM58342V

See NS Package Number V28B

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 MM58342 uses three signals,

DATA IN, CLOCK and ENABLE, where ENABLE acts as an

external load signal. Display blanking can be achieved by

means of the BLANKING CONTROL input, and a logic “1”

will turn off all sections of the display. A block diagram of the

MM58342 is shown in

Figure 1.

Figure 2 shows the pinout of the MM58342 device, where

output 1 (pin 12) is equivalent to bit 1 (i.e., the first bit of data

to be loaded into the shift register following ENABLE high). 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 MM58342, because external

Dual-In-Line Package

00792502

Top View

Order Number MM58342N

See NS Package Number N28B

FIGURE 2.

www.national.com

3