PCF8574; PCF8574A
NXP Semiconductors
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
tBUF
SCL clock frequency
-
-
-
100
-
kHz
bus free time between a STOP and
STARTcondition
4.7
s
tHD;STA
tSU;STA
tSU;STO
tHD;DAT
tVD;DAT
tSU;DAT
tLOW
hold time (repeated) START condition
set-up time for a repeated START condition
set-up time for STOP condition
data hold time
4
-
-
-
-
-
-
-
-
-
-
-
s
s
s
ns
s
ns
s
s
s
s
4.7
4
-
-
0
-
data valid time
-
3.4
data set-up time
250
4.7
4
-
LOW period of the SCL clock
HIGH period of the SCL clock
rise time of both SDA and SCL signals
fall time of both SDA and SCL signals
-
tHIGH
tr
-
-
1
tf
-
0.3
Port timing (see Figure 8 and Figure 9)
tv(Q)
tsu(D)
th(D)
data output valid time
data input set-up time
data input hold time
CL 100 pF
CL 100 pF
CL 100 pF
-
-
-
-
4
-
s
s
s
0
4
-
Interrupt INT timing (see Figure 9)
tv(INT)
valid time on pin INT
from port to INT;
CL 100 pF
-
-
-
-
4
4
s
s
trst(INT)
reset time on pin INT
from SCL to INT;
CL 100 pF
[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
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© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 5 — 27 May 2013
17 of 33
NXP [ NXP ]
