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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCA9557D датащи(PDF) 13 Page - NXP Semiconductors |
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PCA9557D датащи(HTML) 13 Page - NXP Semiconductors |
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13 / 16 page  Philips Semiconductors Product data PCA9557 8-bit I2C and SMBus I/0 port with reset 2001 Dec 12 13 AC SPECIFICATIONS SYMBOL PARAMETER STANDARD MODE I2C BUS FAST MODE I2C BUS UNITS MIN MAX MIN MAX fSCL Operating frequency 0 100 0 400 kHz tBUF Bus free time between STOP and START conditions 4.7 — 1.3 — µs tHD;STA Hold time after (repeated) START condition 4.0 — 0.6 — µs tSU;STA Repeated START condition setup time 4.7 — 0.6 — µs tSU;STO Setup time for STOP condition 4.0 — 0.6 — µs tHD;DAT Data in hold time 0 — 0 — ns tVD;ACK Valid time for ACK condition2 — 1 — 0.9 µs tVD;DAT Data out valid time3 — 1 — 0.9 µs tSU;DAT Data setup time 250 — 100 — ns tLOW Clock LOW period 4.7 — 1.3 — µs tHIGH Clock HIGH period 4.0 — 0.6 — µs tF Clock/Data fall time — 300 20 + 0.1 Cb1 300 ns tR Clock/Data rise time — 1000 20 + 0.1 Cb1 300 ns tSP Pulse width of spikes that must be suppressed by the input filters — 50 — 50 ns Port Timing tPV Output data valid I/O0 — 250 — 250 ns tPV Output data valid I/O1 – I/O7 — 200 — 200 ns tPS Input data setup time 0 — 0 — ns tPH Input data hold time 200 — 200 — ns Reset tW Reset pulse width 4 — 4 — ns tREC Reset recovery time 0 — 0 — ns tRESET Time to reset 400 — 400 — ns NOTES: 1. Cb = total capacitance of one bus line in pF. 2. tVD;ACK = time for Acknowledgement signal from SCL low to SDA (out) low. 3. tVD;DAT = minimum time for SDA data out to be valid following SCL low. tSP tBUF tHD;STA P P S tLOW tR tHD;DAT tF tHIGH tSU;DAT tSU;STA Sr tHD;STA tSU;STO SDA SCL SU00645 Figure 17. Definition of timing on the I2C-bus |
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