5

Electrical Characteristics (continued)

SC654

Parameter

Symbol

Conditions

Min

Typ

Max

Units

SemPulse Interface

Input High Threshold

V

IH

V

IN

= 5.5V

1.6

V

Input Low Threshold

V

IL

V

IN

= 2.9V

0.4

V

Input High Current

I

IH

V

IN

= 5.5V

-1

+1

μA

Input Low Current

I

IL

V

IN

= 5.5V

-1

+1

μA

t

SU

Only required when leaving shutdown mode

1

ms

t

HI

0.75

250

μs

t

LO

0.75

250

μs

t

HOLDA

Software limit — SPIF must be held high for this

amount of time to latch the data

550

5000

μs

t

HOLDD

Software limit — SPIF must be held high for this

amount of time to latch the address

550

μs

t

BR

Software Limit — SPIF must be held high for this

amount of time to force a bus system reset

12

ms

t

SD

Software Limit — SPIF must be held low for this

amount of time to disable device

10

ms

Notes:

(1)

Capacitors are MLCC of X5R type. Production tested with higher value capacitors than the application requires

(2)

SPIF is high for more than 10ms to place serial bus in standby mode

(3)

Current matching is defined as ± [I

BL(MAX)

- I

BL(MIN

] / [I

BL(MAX)

+ I

BL(MIN)

].

(4)

Test voltage is V

OUT

= 4.0V — a relatively extreme LED voltage — to force a transition during test. Typically V

F

= 3.2V for white LEDs.

(5)

The SemPulse start-up time is the minimum time that the SPIF pin must be held high to enable the part before starting communication.

(6)

The source driver used to provide the SemPulse Output must meet these limits.

(7)

The SemPulse shutdown time is the minimum time that the SPIF pin must be pulled low to shut the part down.