A6275ELW(2000) データシートの表示（PDF） - Allegro MicroSystems

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A6275ELW
(Rev.:2000)

8-BIT SERIAL-INPUT, CONSTANT CURRENT LATCHED LED DRIVER

Allegro MicroSystems 

6275

8-BIT SERIAL-INPUT,

CONSTANT-CURRENT

LATCHED LED DRIVER

TIMING REQUIREMENTS and SPECIFICATIONS

(Logic Levels are VDD and Ground)

CLOCK

SERIAL

DATA IN

SERIAL

DATA OUT

LATCH

ENABLE

OUTPUT

ENABLE

C

50%

A

B

DATA

50%

tp

50%

D

E

50%

DATA

LOW = ALL OUTPUTS ENABLED

OUT N

tp

HIGH = OUTPUT OFF

50%

DATA

LOW = OUTPUT ON

Dwg. WP-029-1

OUTPUT

ENABLE

OUT N

HIGH = ALL OUTPUTS DISABLED (BLANKED)

50%

F

t en(BQ)

t dis(BQ)

tf

tr

90%

DATA

10%

Dwg. WP-030-1

A. Data Active Time Before Clock Pulse

(Data Set-Up Time), tsu(D) .......................................... 60 ns

B. Data Active Time After Clock Pulse

(Data Hold Time), th(D) .............................................. 20 ns

C. Clock Pulse Width, tw(CK) ............................................... 50 ns

D. Time Between Clock Activation

and Latch Enable, tsu(L) ............................................ 100 ns

E. Latch Enable Pulse Width, tw(L) ................................... 100 ns

F. Output Enable Pulse Width, tw(OE) ................................ 4.5 µs

NOTE – Timing is representative of a 10 MHz clock.

Significantly higher speeds are attainable.

— Max. Clock Transition Time, tr or tf .............................. 10 µs

Information present at any register is transferred to the

respective latch when the LATCH ENABLE is high (serial-to-

parallel conversion). The latches will continue to accept new

data as long as the LATCH ENABLE is held high. Applica-

tions where the latches are bypassed (LATCH ENABLE tied

high) will require that the OUTPUT ENABLE input be high

during serial data entry.

When the OUTPUT ENABLE input is high, the output

source drivers are disabled (OFF). The information stored in the

latches is not affected by the OUTPUT ENABLE input. With

the OUTPUT ENABLE input low, the outputs are controlled by

the state of their respective latches.

115 Northeast Cutoff, Box 15036

6

Worcester, Massachusetts 01615-0036 (508) 853-5000

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