PCF8575 datasheet(9/32 Pages) TI

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Electrical Characteristics

I2C Interface Timing Requirements

PCF8575

REMOTE 16-BIT I2C AND SMBus I/O EXPANDER

WITH INTERRUPT OUTPUT

SCPS121D – JANUARY 2005 – REVISED APRIL 2007

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

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP(1)

MAX

UNIT

VIK

Input diode clamp voltage

II = –18 mA

2.5 V to 5.5 V

–1.2

VPOR Power-on reset voltage(2)

VI = VCC or GND, IO = 0

VPOR

1.2

1.8

IOH

P port

VO = GND

2.5 V to 5.5 V

–30

–300

µA

IOHT

P-port transient pullup current

High during ACK, VOH = GND

2.5 V

–0.5

–1

SDA

VOL = 0.4 V

IOL

P port

2.5 V to 5.5 V

VOL = 1 V

INT

VOL = 0.4 V

1.6

SCL, SDA

±5

VI = VCC or GND

2.5 V to 5.5 V

µA

A0, A1, A2

±1

IIHL

P port

VI ≥ VCC or VI ≤ GND

2.5 V to 5.5 V

±400

µA

5.5 V

100

200

VI = VCC or GND, IO = 0,

Operating mode

3.6 V

fscl = 400 kHz

2.7 V

ICC

µA

5.5 V

2.5

Standby mode

VI = VCC or GND, IO = 0, fscl = 0 kHz

3.6 V

2.5

2.7 V

2.5

One input at VCC – 0.6 V,

∆I

Supply current increase

2.5 V to 5.5 V

200

µA

Other inputs at VCC or GND

SCL

VI = VCC or GND

2.5 V to 5.5 V

SDA

Cio

VIO = VCC or GND

2.5 V to 5.5 V

P port

(1)

All typical values are at nominal supply voltage (2.5-V, 3.3-V, or 5-V VCC) and TA = 25°C.

(2)

The power-on reset circuit resets the I2C bus logic with VCC < VPOR and sets all I/Os to logic high (with current source to VCC).

over recommended operating free-air temperature range (unless otherwise noted) (see Figure 6)

MIN

MAX

UNIT

fscl

I2C clock frequency

400

kHz

tsch

I2C clock high time

0.6

µs

tscl

I2C clock low time

1.3

µs

tsp

I2C spike time

tsds

I2C serial data setup time

100

tsdh

I2C serial data hold time

ticr

I2C input rise time

20 + 0.1Cb(1)

300

ticf

I2C input fall time

20 + 0.1Cb(1)

300

tocf

I2C output fall time

10-pF to 400-pF bus

300

tbuf

I2C bus free time between Stop and Start

1.3

µs

tsts

I2C start or repeated Start condition setup

0.6

µs

tsth

I2C start or repeated Start condition hold

0.6

µs

tsps

I2C Stop condition setup

0.6

µs

tvd

Valid-data time

SCL low to SDA output valid

1.2

µs

I2C bus capacitive load

400

(1)

Cb = total bus capacitance of one bus line in pF

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