6277

8-BIT SERIAL-INPUT,

CONSTANT-CURRENT

LATCHED LED DRIVER

www.allegromicro.com

9

TERMINAL DESCRIPTION

Terminal No.

Terminal Name

Function

1

LOGIC GROUND

Reference terminal for control logic.

2

SERIAL DATA IN

Serial-data input to the shift-register.

3

CLOCK

Clock input terminal for data shift on rising edge.

4

LATCH ENABLE

Data strobe input terminal; serial data is latched with high-level input.

5

HIGH/LOW

Logic low for 100% of programmed current level;

(CURRENT)

logic high for 50% of programmed current level.

6

POWER GROUND

Ground.

7-14

The eight current-sinking output terminals.

15

POWER GROUND

Ground.

16

OUTPUT ENABLE

When (active) low, the output drivers are enabled; when high, all output

drivers are turned OFF (blanked).

17

CMOS serial-data output (on clock falling edge).

18

CMOS serial-data output (on clock rising edge)

to the following shift-registers.

19

An external resistor at this terminal establishes the output current for all sink

drivers.

20

LOGIC SUPPLY

The products described here are manufactured under one or more

U.S. patents or U.S. patents pending.

Allegro MicroSystems, Inc. reserves the right to make, from time to

time, such departures from the detail specifications as may be

required to permit improvements in the performance, reliability, or

manufacturability of its products. Before placing an order, the user is

cautioned to verify that the information being relied upon is current.

Allegro products are not authorized for use as critical components

in life-support devices or systems without express written approval.

The information included herein is believed to be accurate and

reliable. However, Allegro MicroSystems, Inc. assumes no responsi-

bility for its use; nor for any infringement of patents or other rights of

third parties which may result from its use.