SC623

5

Electrical Characteristics (continued)

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Digital I/O Electrical Specifications (FLEN, SWIF)

Input High Threshold

V

IH

V

IN

= 5.5V

1.6

V

Input Low Threshold

V

IL

V

IN

= 3.0V

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

SemWire Bit Rate

f

SWIF

10

75

kbit/s

t

EN

1ms

t

DIS

10

ms

D

DL

5

bit

Notes:

(1)

ΔV

F

is the voltage difference between any two LEDs.

(2)

Once tripped, flash output will remain disabled until FLEN pin is cycled or reset via serial interface.

(3)

Current matching equals ± [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

OUT

= 3.2V for white LEDs.

(5)

The SemWire start-up time is the minimum period that the SWIF pin must be held high to enable the part before commencing

communication.

(6)

The SemWire disable time is the minimum period that the SWIF pin must be pulled low to shut the part down.

(7)

The SemWire data latch delay is the maximum duration after communication has ended before the register is updated.