TCA9543APWR datasheet(7/32 Pages) TI1

Part #	TCA9543APWR

Description	TCA9543A Low Voltage 2-Channel I2C Bus Switch With Interrupt Logic And Reset

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TCA9543A

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SCPS206A – MARCH 2014 – REVISED FEBRUARY 2015

7.7 Switching Characteristics

over recommended operating free-air temperature range, CL ≤ 100 pF (unless otherwise noted) (see Figure 7)

FROM

TO

PARAMETER

MIN

MAX

UNIT

(INPUT)

(OUTPUT)

RON = 20 Ω, CL = 15 pF

0.3

tpd

(1)

Propagation delay time

SDA or SCL

SDn or SCn

ns

RON = 20 Ω, CL = 50 pF

1

tiv

Interrupt valid time(2)

INTn

INT

4

μs

tir

Interrupt reset delay time(2)

INTn

INT

2

μs

(1)

The propagation delay is the calculated RC time constant of the typical ON-state resistance of the switch and the specified load

capacitance, when driven by an ideal voltage source (zero output impedance).

(2)

Data taken using a 4.7-k

Ω pullup resistor and 100-pF load (see Figure 7)

7.8 Interrupt and Reset Timing Requirements

over recommended operating free-air temperature range (unless otherwise noted) (see Figure 7)

PARAMETER

MIN

MAX

UNIT

tPWRL

Required low-level pulse duration of INTn inputs(1)

1

μs

tPWRH

Required high-level pulse duration of INTn inputs(1)

0.5

μs

tWL

Pulse duration, RESET low

4

ns

trst

(2)

RESET time (SDA clear)

500

ns

tREC

Recovery time from RESET to start

0

ns

(1)

The device has interrupt input rejection circuitry for pulses less than the listed minimum.

(2)

trst is the propagation delay measured from the time the RESET terminal is first asserted low to the time the SDA terminal is asserted

high, signaling a stop condition. It must be a minimum of tWL.

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