LS7055 datasheet(6/6 Pages) LSI

No de pièce	LS7055

Description	6 DECADE PREDETERMINING UP/DOWN COUNTER

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Fabricant	LSI [LSI Computer Systems]

Site Internet	http://www.lsicsi.com

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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

15

16

1

40

3

2

31

MAINSIGNAL

OUTPUT

PRESIGNAL

OUTPUT

ZERO DETECT

OUTPUT

INHIBIT

INTERNAL

PRESET INPUT

RESET

INPUT

PRESET ENABLE

INPUT

UP/DOWN

INPUT

INHIBIT

INTERNAL

RESET INPUT

9

36

38

5

4

6

7

39

FIGURE 7.

LS7055/LS7056 BLOCK DIAGRAM

SCAN INPUT CLOCK

10

11

12

13

B1

B4

B2

B8

17

18

19

20

21

22

32

33

34 35

24 25 26 27 28 29 30

Numéro de pièce similaire - LS7055

Fabricant	No de pièce	Fiches technique	Description
CITIZEN ELECTRONICS CO....	LS70	454Kb / 1P	Switch operating force
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	LS7030	68Kb / 4P	8 DECADE MULTIPLEXED COUNTER
	LS7031	47Kb / 4P	6 DECADE MOS UP COUNTER WITH 8 DECADE LATCH AND MULTIPLEXER
	LS7031	70Kb / 4P	6 DECADE MOS UP COUNTER WITH 8 DECADE LATCH AND MULTIPLEXER

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ON Semiconductor	MC14029B	124Kb / 8P	Binary/Decade Up/Down Counter August, 2005 ??Rev. 6
Motorola, Inc	MC14029B	279Kb / 8P	Binary/Decade Up/Down Counter
ON Semiconductor	MC14029B	241Kb / 8P	Binary/Decade Up/Down Counter March, 2000 ??Rev. 3
NXP Semiconductors	HEF4029B	188Kb / 14P	Synchronous up/down counter, binary/decade counter January 1995
NXP Semiconductors	HEF40192B	129Kb / 9P	4-bit up/down decade counter January 1995
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