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Switching Characteristics

Timing Requirements

PCA9518

EXPANDABLE FIVE-CHANNEL I2C HUB

SCPS132A – JUNE 2006 – REVISED JULY 2007

over operating free-air temperature range (unless otherwise noted) (see Figure 2)

(1)

FROM

PARAMETER

MIN

TYP

MAX

UNIT

(INPUT)

(OUTPUT)

tPHLs

(2)

105

202

389

SDA or SCL

SDAn or SCLn

tPLHs

(3)

105

259

265

tPHLE1s

Propagation delay

109

193

327

EXPSDA1 or EXPSCL1

SDA or SCL

tPLHE1s

120

153

200

tPLHE2s

EXPSDA2 or EXPSCL2

SDA or SCL

120

234

279

tTHLs

70%

30%

110

187

Output transition time,

SDAn, SCLn

tTLHs

30%

70%

0.85RC

(1)

The SDA and SCL propagation delays are dominated by rise times or fall times. The fall times mostly are internally controlled and are

sensitive only to load capacitance. The rise times are RC time-constant controlled and, therefore, a specific numerical value can be

given only for fixed RC time constants.

(2)

The SDA high-to-low propagation delay, tPHLs, includes the fall time from VCC to 0.5 VCC of EXPSDA1 or EXPSCL1 and the SDA or SCL

fall time from the quiescent high (usually VCC) to below 0.3 VCC. The SDA and SCL outputs have edge-rate-control circuits included that

make the fall time almost independent of load capacitance.

(3)

The SDA or SCL low-to-high propagation delay, tPLHs, includes the rise-time constant from the quiescent low to 0.5 VCC for EXPSDA1 or

EXPSCL2, the rise-time constant for the quiescent low to 0.5 VCC for EXPSDA1 or EXPSCL1, and the rise time constant from the

quiescent externally driven low to 0.7 VCC for SDA or SCL.

over operating free-air temperature range (unless otherwise noted)

PARAMETER

MIN

MAX

UNIT

tsu

Setup time, EN

↑ before Start condition

300

Hold time, EN

↓ after Stop condition

300

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