PCA8575 Datasheet, PDF (17/30 Pages) NXP Semiconductors – Remote 16-bit I/O expander for I2C-bus with interrupt

NXP Semiconductors
PCA8575
Remote 16-bit I/O expander for I²C-bus with interrupt
13. Dynamic characteristics
Table 6. Dynamic characteristics
V_DD = 2.3 V to 5.5 V; V_SS = 0 V; T_amb = −40 °C to +85 °C; unless otherwise specified.
Symbol Parameter
Conditions
Fast mode I²C-bus
Min
Typ
Max
f_SCL
SCL clock frequency
t_BUF
bus free time between a STOP and START
condition
0
-
400
1.3
-
-
t_HD;STA
t_SU;STA
t_SU;STO
t_HD;DAT
t_VD;ACK
t_VD;DAT
t_SU;DAT
t_LOW
t_HIGH
t_f
t_r
t_SP
hold time (repeated) START condition
set-up time for a repeated START condition
set-up time for STOP condition
data hold time
data valid acknowledge time
data valid time
data set-up time
LOW period of the SCL clock
HIGH period of the SCL clock
fall time of both SDA and SCL signals
rise time of both SDA and SCL signals
pulse width of spikes that must be suppressed
by the input filter
0.6
-
-
0.6
-
-
0.6
-
-
0
-
-
[1] _0.1
-
0.9
[2] ₅₀
-
-
100
-
-
1.3
-
-
0.6
-
-
[3][4] _{20 + 0.1Cb[5] -}
300
20 + 0.1C_b[5] -
300
[6] _-
-
50
Port timing; C_L ≤ 100 pF (see Figure 11 and Figure 12)
t_v(Q)
data output valid time
t_su(D)
data input set-up time
t_h(D)
data input hold time
Interrupt timing; C_L ≤ 100 pF (see Figure 11 and Figure 12)
t_v(D)
data input valid time
t_d(rst)
reset delay time
-
-
4
0
-
-
4
-
-
-
-
4
-
-
4
Unit
kHz
µs
µs
µs
µs
ns
µs
ns
ns
µs
µs
ns
ns
ns
µs
µs
µs
µs
µs
[1] t_VD;ACK = time for Acknowledgement signal from SCL LOW to SDA (out) LOW.
[2] t_VD;DAT = minimum time for SDA data out to be valid following SCL LOW.
[3] A master device must internally provide a hold time of at least 300 ns for the SDA signal (refer to the V_IL of the SCL signal) in order to
bridge the undefined region SCL’s falling edge.
[4] The maximum t_f for the SDA and SCL bus lines is specified at 300 ns. The maximum fall time for the SDA output stage t_f is specified at
250 ns. This allows series protection resistors to be connected between the SDA and the SCL pins and the SDA/SCL bus lines without
exceeding the maximum specified t_f.
[5] C_b = total capacitance of one bus line in pF.
[6] Input filters on the SDA and SCL inputs suppress noise spikes less than 50 ns.
PCA8575_2
Product data sheet
Rev. 02 — 21 March 2007
© NXP B.V. 2007. All rights reserved.
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