Datasheet
ELECTRICAL CHARACTERISTICS
PCA9557
SCPS133I – DECEMBER 2005 – REVISED JUNE 2008 ....................................................................................................................................................
www.ti.com
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP
(1)
MAX UNIT
V
IK
Input diode clamp voltage I
I
= – 18 mA 2.3 V to 5.5 V – 1.2 V
V
POR
Power-on reset voltage V
I
= V
CC
or GND, I
O
= 0 V
POR
1.65 2.1 V
2.3 V 1.8
3 V 2.6
I
OH
= – 8 mA
4.5 V 3
4.75 V 4.1
V
OH
P-port high-level output voltage
(2)
V
2.3 V 1.5
3 V 2.5
I
OH
= – 10 mA
4.5 V 3
4.75 V 4
SDA V
OL
= 0.4 V 2.3 V to 5.5 V 3
V
OL
= 0.5 V 8 20
I
OL
mA
P port
(3)
V
OL
= 0.55 V 2.3 V to 5.5 V 8 20
V
OL
= 0.7 V 10 24
P port, except for P0
(3)
V
OH
= 2.3 V 2.3 V to 5.5 V – 4 mA
I
OH
V
OH
= 4.6 V 4.6 V to 5.5 V 1
P0
(3)
µ A
V
OH
= 3.3 V 3.3 V to 5.5 V 1
SCL, SDA ± 1
I
I
V
I
= V
CC
or GND 2.3 V to 5.5 V µ A
A2 – A0, RESET ± 1
I
IH
P port V
I
= V
CC
2.3 V to 5.5 V 1 µ A
I
IL
P port V
I
= GND 2.3 V to 5.5 V 1 µ A
5.5 V 19 25
V
I
= V
CC
or GND, I
O
= 0,
3.6 V 12 22
I/O = inputs, f
SCL
= 400 kHz
2.7 V 8 20
Operating mode
5.5 V 1.5 5
V
I
= V
CC
or GND, I
O
= 0,
I
CC
3.6 V 1 4 µ A
I/O = inputs, f
SCL
= 100 kHz
2.7 V 0.6 3
5.5 V 0.25 1
V
I
= V
CC
or GND, I
O
= 0,
Standby mode 3.6 V 0.25 0.9
I/O = inputs, f
SCL
= 0 kHz
2.7 V 0.2 0.8
One input at V
CC
– 0.6 V,
2.3 V to 5.5 V 0.2
Other inputs at V
CC
or GND
Δ I
CC
Additional current in Standby mode mA
Every LED I/O at V
I
= 4.3 V,
5.5 V 0.4
f
SCL
= 0 kHz
C
I
SCL V
I
= V
CC
or GND 2.3 V to 5.5 V 4 6 pF
SDA 5.5 8
C
io
V
IO
= V
CC
or GND 2.3 V to 5.5 V pF
P port 7.5 9.5
(1) All typical values are at nominal supply voltage (2.5-V, 3.3-V, or 5-V V
CC
) and T
A
= 25 ° C.
(2) The total current sourced by all I/Os must be limited to 85 mA per bit.
(3) Each I/O must be externally limited to a maximum of 25 mA, and the P port (P7 – P0) must be limited to a maximum current of 200 mA.
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