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8574A Datasheet PDF : 33 Pages
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NXP Semiconductors
PCF8574; PCF8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
14. Dynamic characteristics
Table 10. Dynamic characteristics
VDD = 2.5 V to 6 V; VSS = 0 V; Tamb = 40 C to +85 C; unless otherwise specified.
Symbol Parameter
Conditions
Min Typ Max Unit
I2C-bus timing[1] (see Figure 17)
fSCL
SCL clock frequency
tBUF
bus free time between a STOP and
START condition
-
-
4.7
-
100 kHz
-
s
tHD;STA
hold time (repeated) START condition
tSU;STA
set-up time for a repeated START condition
tSU;STO
set-up time for STOP condition
tHD;DAT
data hold time
tVD;DAT
data valid time
tSU;DAT
data set-up time
tLOW
LOW period of the SCL clock
tHIGH
HIGH period of the SCL clock
tr
rise time of both SDA and SCL signals
tf
fall time of both SDA and SCL signals
Port timing (see Figure 8 and Figure 9)
4
-
4.7
-
4
-
0
-
-
-
250
-
4.7
-
4
-
-
-
-
-
-
s
-
s
-
s
-
ns
3.4
s
-
ns
-
s
-
s
1
s
0.3
s
tv(Q)
data output valid time
tsu(D)
data input set-up time
th(D)
data input hold time
Interrupt INT timing (see Figure 9)
CL 100 pF
CL 100 pF
CL 100 pF
-
-
0
-
4
-
4
s
-
s
-
s
tv(INT)
trst(INT)
valid time on pin INT
reset time on pin INT
from port to INT;
CL 100 pF
from SCL to INT;
CL 100 pF
-
-
4
s
-
-
4
s
[1] All the timing values are valid within the operating supply voltage and ambient temperature range and refer to VIL and VIH with an input
voltage swing of VSS to VDD.
PCF8574_PCF8574A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 27 May 2013
© NXP B.V. 2013. All rights reserved.
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