Philips Semiconductors
Product specification
Remote 8-bit I/O expander for I2C-bus
PCF8574
SYMBOL
I/Os
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
VIL
LOW level input voltage
HIGH level input voltage
−0.5
−
−
−
+0.3VDD
VDD + 0.5
±400
V
V
VIH
0.7VDD
IIHL(max)
maximum allowed input
current through protection
diode
VI ≥ VDD or VI ≤ VSS
−
µA
IOL
LOW level output current
HIGH level output current
transient pull-up current
VOL = 1 V; VDD = 5 V
VOH = VSS
10
30
−
25
−
−
mA
µA
IOH
IOHt
300
−
HIGH during acknowledge
−1
mA
(see Fig.14); VOH = VSS
VDD = 2.5 V
;
Ci
input capacitance
output capacitance
−
−
−
−
10
10
pF
pF
Co
Port timing; CL ≤ 100 pF (see Figs 10 and 11)
tpv
tsu
th
output data valid
−
0
4
−
−
−
4
−
−
µs
µs
µs
input data set-up time
input data hold time
Interrupt INT (see Fig.13)
IOL LOW level output current
IL leakage current
TIMING; CL ≤ 100 PF
VOL = 0.4 V
1.6
−
−
−
mA
VI = VDD or VSS
−1
+1
µA
tiv
tir
input data valid time
reset delay time
−
−
−
−
4
4
µs
µs
Select inputs A0 to A2
VIL
VIH
ILI
LOW level input voltage
−0.5
−
−
−
+0.3VDD
VDD + 0.5
+250
V
HIGH level input voltage
input leakage current
0.7VDD
−250
V
pin at VDD or VSS
nA
Note
1. The Power-on reset circuit resets the I2C-bus logic with VDD < VPOR and sets all I/Os to logic 1 (with current source
to VDD).
1997 Apr 02
14
NXP [ NXP ]
