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PD557 Datasheet(PDF) 13 Page - Texas Instruments |
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PD557 Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 36 page  I 2C INTERFACE TIMING REQUIREMENTS RESET TIMING REQUIREMENTS SWITCHING CHARACTERISTICS PCA9557 www.ti.com.................................................................................................................................................... SCPS133I – DECEMBER 2005 – REVISED JUNE 2008 over recommended operating free-air temperature range (unless otherwise noted) (see Figure 10) STANDARD MODE FAST MODE I2C BUS I2C BUS UNIT MIN MAX MIN MAX fscl I2C clock frequency 0 100 0 400 kHz tsch I2C clock high time 4 0.6 µs tscl I2C clock low time 4.7 1.3 µs tsp I2C spike time 50 50 ns tsds I2C serial data setup time 250 100 ns tsdh I2C serial data hold time 0 0 ns ticr I2C input rise time 1000 20 + 0.1Cb (1) 300 ns ticf I2C input fall time 300 20 + 0.1Cb (1) 300 ns tocf I2C output fall time, 10-pF to 400-pF bus 300 20 + 0.1Cb (1) 300 ns tbuf I2C bus free time between Stop and Start 4.7 1.3 µs tsts I2C Start or repeated Start condition setup time 4.7 0.6 µs tsth I2C Start or repeated Start condition hold time 4 0.6 µs tsps I2C Stop condition setup time 4 0.6 µs tvd(data) Valid data time, SCL low to SDA output valid 1 0.9 µs Valid data time of ACK condition, ACK signal from SCL low to tvd(ack) 1 0.9 µs SDA (out) low Cb I2C bus capacitive load 400 400 pF (1) Cb = total capacitance of one bus line in pF over recommended operating free-air temperature range (unless otherwise noted) (see Figure 13) STANDARD MODE FAST MODE I2C BUS I2C BUS UNIT MIN MAX MIN MAX tW Reset pulse duration(1) 16 16 ns tREC Reset recovery time 0 0 ns tRESET Time to reset(2) 400 400 ns (1) A pulse duration of 16 ns minimum must be applied to RESET to return the PCA9557 to its default state. (2) The PCA9557 requires a minimum of 400 ns to be reset. over recommended operating free-air temperature range (unless otherwise noted) (see Figure 10) STANDARD MODE FAST MODE I2C BUS I2C BUS PARAMETER FROM TO UNIT MIN MAX MIN MAX SCL P0 250 250 tpv Output data valid ns SCL P1–P7 200 200 tps Input data setup time P port SCL 0 0 ns tph Input data hold time P port SCL 200 200 ns Copyright © 2005–2008, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Link(s): PCA9557 |
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