LS7055 datasheet(6/6 Pages) LSI

6 / 6 page

7055-012703-6

THUMBWHEEL

SWITCHES

LS7055/LS7056

7 SEGMENT

OUTPUT

2.5k

Ω

(typical)

10k

Ω (typical)

DIGITAL SELECT OUTPUTS

FIGURE 6.

Driving a small LED Display

(Typically 1/8") at 12V power

supply. The 2.7k

Ω resistors

provide approximately 3 mA

segment drive.

PRESET STORE

BCD TO 7

SEGMENT

DECODER

MULTIPLEXER

BLANKING

GENERATOR

LATCH

MAINSIGNAL STORE

MAINSIGNAL COMPARATOR

PRESIGNAL STORE

PRESIGNAL COMPARATOR

ZERO DETECTOR

6 DECADE UP/DOWN COUNTER

COUNTER RESET

COUNTER PRESET

UP/DOWN

CONTROL

BLANKING

OVERRIDE

INPUT

LAMP TEST INPUT

(OPTIONAL-LS7056)

7 SEGMENT

OUTPUTS

BCD

OUTPUTS

DIGIT SELECT

OUTPUTS

DIGIT SELECT

GENERATOR

SCAN

OSCILLATOR

DATA TRANSFER INPUT

DECODER

STORAGE

SELECT 1

STORAGE

SELECT 2

DIVIDE

CONTROL INPUT 1

DIVIDE

CONTROL INPUT 2

BCD

DATA

INPUTS

COUNT

INPUT

COUNT INHIBIT

INPUT

+1, 5, 6

SELECT

MAINSIGNAL STORE

PRESIGNAL STORE

PRESET STORE

COUNT

MAINSIGNAL

OUTPUT

PRESIGNAL

OUTPUT

ZERO DETECT

OUTPUT

INHIBIT

INTERNAL

PRESET INPUT

RESET

INPUT

PRESET ENABLE

INPUT

UP/DOWN

INPUT

INHIBIT

INTERNAL

RESET INPUT

FIGURE 7.

LS7055/LS7056 BLOCK DIAGRAM

SCAN INPUT CLOCK

34 35

24 25 26 27 28 29 30

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