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PCA9555DB Datasheet(PDF) 7 Page - Texas Instruments |
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PCA9555DB Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 42 page  PCA9555 www.ti.com SCPS131F – AUGUST 2005 – REVISED JUNE 2014 6.5 I 2C Interface Timing Requirements over recommended operating free-air temperature range (unless otherwise noted) (see Figure 14) MIN MAX UNIT fscl I2C clock frequency 0 400 kHz tsch I2C clock high time 0.6 μs tscl I2C clock low time 1.3 μs tsp I2C spike time 50 ns tsds I2C serial-data setup time 100 ns tsdh I2C serial-data hold time 0 ns ticr I2C input rise time 20 + 0.1Cb (1) 300 ns ticf I2C input fall time 20 + 0.1Cb (1) 300 ns tocf I2C output fall time 10-pF to 400-pF bus 20 + 0.1Cb (1) 300 ns 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(Data) Valid-data time SCL low to SDA output valid 50 ns tvd(ack) Valid-data time of ACK condition ACK signal from SCL low to SDA (out) low 0.1 0.9 μs Cb I2C bus capacitive load 400 pF (1) Cb = total capacitance of one bus line in pF 6.6 Switching Characteristics over recommended operating free-air temperature range, CL ≤ 100 pF (unless otherwise noted) (see Figure 15 and Figure 16) FROM TO PARAMETER MIN MAX UNIT (INPUT) (OUTPUT) tiv Interrupt valid time P port INT 4 μs tir Interrupt reset delay time SCL INT 4 μs tpv Output data valid SCL P port 200 ns tps Input data setup time P port SCL 150 ns tph Input data hold time P port SCL 1 μs Copyright © 2005–2014, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: PCA9555 |
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