16-Channel Constant-Current Latched LED Driver

with Open LED Detection and Dot Correction

A6285

6

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Characteristic

Symbol

Test Conditions

Min.

Max.

Unit

Clock Frequency

CLK

–

–

30

MHz

Clock Pulse Duration

CLK = High/Low

16

–

–

ns

Clock Frequency (cascaded)

CLK

–

–

25

MHz

LE Pulse Duration

LE = High

20

–

–

ns

Setup Time

SDI to CLK↑

10

–

–

ns

CLK↑ to LE↑

10

–

–

ns

MODE↑↓ to CLK↑

10

–

–

ns

MODE↑↓ to LE↑

10

–

–

ns

Hold Time

CLK↑ to SDI

10

–

–

ns

LE↓ to CLK↑

10

–

–

ns

CLK↑ to MODE↑↓

10

–

–

ns

LE↓ to MODE↑↓

10

–

–

ns

Rise Time

SDO, 10/90% points (see figure 1)

–

–

16

ns

(see figure 2)

–10

30

ns

Fall Time

SDO, 10/90% points (see figure 1)

–

–

16

ns

(see figure 2)

–10

30

ns

Propagation Delay Time

CLK↑ to SDO↑↓ (see figure 1)

–

–

30

ns

MODE↑↓ to SDO↑↓ (see figure 1)

–

–

30

ns

O¯¯E¯↓ to OUT0↑↓ (see figure 2)

–

–

60

ns

LE↑ to OUT0↑↓ (see figure 2)

–

–

60

ns

OUTx↑↓ to FAULT↑↓ (see figures 2 and 3)

–

–

1000

ns

–

–

200

ns

LOD Sample and Read Time

1660

–

–

ns

Output Delay Time

OUTx↑↓ to OUT(x+1)↑↓ (see figure 2)

10

20

40

ns

individual units, within the specified maximum and minimum limits d maximum and minimum limits.

SDO

15 pF

OUTx

A6285

51

15 pF

A6285

FAULT

A6285

1.2

k

Parameter Measurement Information