X4643 datasheet(17/22 Pages) XICOR

17 / 22 page

X4643/5 – Preliminary Information

Characteristics subject to change without notice.

17 of 22

REV 1.26 4/30/02

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Power-Up and Power-Down Timing

RESET Output Timing

Notes: (8) This parameter is periodically sampled and not 100% tested.

SDA vs. RESET Timing

Symbol

Parameter

Min.

Typ.

Max.

Unit

VTRIP

Reset Trip Point Voltage, X4643/5-4.5A

Reset Trip Point Voltage, X4643/5

Reset Trip Point Voltage, X4643/5-2.7A

Reset Trip Point Voltage, X4643/5-2.7

4.5

4.25

2.85

2.55

4.62

4.38

2.92

2.62

4.75

4.5

3.0

2.7

tPURST

Power-up Reset Time Out

100

250

400

tRPD

(8)

VCC Detect to Reset/Output

500

(8)

VCC Fall Time

100

µs

(8)

VCC Rise Time

100

µs

VRVALID

Reset Valid VCC

VCC

tPURST

tRPD

0 Volts

VTRIP

RESET

VRVALID

(X4645)

(X4643)

tPURST

VRVALID

tRSP<tWDO

tRST

RESET

SDA

tRSP

Note: All inputs are ignored during the active reset period (tRST).

tRST

SCL

tRSP>tWDO

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