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PCF8574DWE4 Datasheet(PDF) 7 Page - Texas Instruments |
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PCF8574DWE4 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 26 page  Electrical Characteristics I 2C Interface Timing Requirements PCF8574 www.ti.com ............................................................................................................................................................... SCPS068G – JULY 2001 – REVISED MAY 2008 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 6 V –1.2 V VPOR Power-on reset voltage(2) VI = VCC or GND, IO = 0 6 V 1.3 2.4 V IOH P port VO = GND 2.5 V to 6 V 30 300 µA IOHT P-port transient pullup current High during acknowledge, VOH = GND 2.5 V –1 mA SDA VO = 0.4 V 2.5 V to 6 V 3 IOL P port VO = 1 V 5 V 10 25 mA INT VO = 0.4 V 2.5 V to 6 V 1.6 SCL, SDA ±5 II INT VI = VCC or GND 2.5 V to 6 V ±5 µA A0, A1, A2 ±5 IIHL P port VI ≥ VCC or VI ≤GND 2.5 V to 6 V ±400 µA Operating mode VI = VCC or GND, IO = 0, fSCL = 100 kHz 40 100 ICC 6 V µA Standby mode VI = VCC or GND, IO = 0 2.5 10 Ci SCL VI = VCC or GND 2.5 V to 6 V 1.5 7 pF SDA 3 7 Cio VIO = VCC or GND 2.5 V to 6 V pF P port 4 10 (1) All typical values are at VCC = 5 V, 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 3) MIN MAX UNIT fscl I2C clock frequency 100 kHz tsch I2C clock high time 4 µs tscl I2C clock low time 4.7 µs tsp I2C spike time 100 ns tsds I2C serial data setup time 250 ns tsdh I2C serial data hold time 0 ns ticr I2C input rise time 1 µs ticf I2C input fall time 0.3 µs tocf I2C output fall time (10-pF to 400-pF bus) 300 ns tbuf I2C bus free time between stop and start 4.7 µs tsts I2C start or repeated start condition setup 4.7 µs tsth I2C start or repeated start condition hold 4 µs tsps I2C stop condition setup 4 µs tvd Valid data time SCL low to SDA output valid 3.4 µs Cb I2C bus capacitive load 400 pF Copyright © 2001–2008, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): PCF8574 |
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