TL5812, TL5812l

VACUUM FLUORESCENT DISPLAY DRIVERS

SLDS011B − OCTOBER 1985 − REVISED MAY 1993

3

POST OFFICE BOX 655303

POST OFFICE BOX 1443

FUNCTION TABLE

CONTROL INPUTS

SHIFT REGISTERS

LATCHES

OUTPUTS

FUNCTION

CLOCK

LATCH

ENABLE

BLANKING

SHIFT REGISTERS

R1 THRU R20

LATCHES

LC1 THRU LC20

SERIAL

Q1 THRU Q20

Load

↑

No

↑

X

X

X

X

Load and shift†

No change

Determined by

LATCH ENABLE‡

R20

R20

Determined by BLANKING

Latch

X

X

L

H

X

X

As determined above

Stored data

New data

R20

R20

Determined by BLANKING

Blank

X

X

X

X

H

L

As determined above

Determined by

LATCH ENABLE‡

R20

R20

All L

LC1 thru LC10, respectively

H = high level,

L = low level,

X = irrelevant,

↑= low-to-high-level transition.

† R20 takes on the state of R19, R19 takes on the state of R18, ... R2 takes on the state of R1, and R1 takes on the state of the data input.

‡ New data enter the latches while LATCH ENABLE is high. These data are stored while LATCH ENABLE is low.

typical operating sequence

Invalid

CLOCK

DATA IN

SR

Contents

LATCH

ENABLE

Latch

Contents

BLANKING

Q Outputs

Valid

Irrelevant

Valid

Previously Stored Data

New Data Valid

Valid

schematics of inputs and outputs

EQUIVALENT OF EACH INPUT

TYPICAL OF SERIAL OUTPUT

VCC1

Input

GND

VCC1

Output

GND

VCC2

Output

GND

TYPICAL OF ALL Q OUTPUTS