Datasheet
Electrical Characteristics
I
2
C Interface Timing Requirements
PCF8574
www.ti.com
............................................................................................................................................................... SCPS068G – JULY 2001 – REVISED MAY 2008
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 2.5 V to 6 V – 1.2 V
V
POR
Power-on reset voltage
(2)
V
I
= V
CC
or GND, I
O
= 0 6 V 1.3 2.4 V
I
OH
P port V
O
= GND 2.5 V to 6 V 30 300 µ A
I
OHT
P-port transient pullup current High during acknowledge, V
OH
= GND 2.5 V – 1 mA
SDA V
O
= 0.4 V 2.5 V to 6 V 3
I
OL
P port V
O
= 1 V 5 V 10 25 mA
INT V
O
= 0.4 V 2.5 V to 6 V 1.6
SCL, SDA ± 5
I
I
INT V
I
= V
CC
or GND 2.5 V to 6 V ± 5 µ A
A0, A1, A2 ± 5
I
IHL
P port V
I
≥ V
CC
or V
I
≤ GND 2.5 V to 6 V ± 400 µ A
Operating mode V
I
= V
CC
or GND, I
O
= 0, f
SCL
= 100 kHz 40 100
I
CC
6 V µ A
Standby mode V
I
= V
CC
or GND, I
O
= 0 2.5 10
C
i
SCL V
I
= V
CC
or GND 2.5 V to 6 V 1.5 7 pF
SDA 3 7
C
io
V
IO
= V
CC
or GND 2.5 V to 6 V pF
P port 4 10
(1) All typical values are at V
CC
= 5 V, T
A
= 25 ° C.
(2) The power-on reset circuit resets the I
2
C-bus logic with V
CC
< V
POR
and sets all I/Os to logic high (with current source to V
CC
).
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 3 )
MIN MAX UNIT
f
scl
I
2
C clock frequency 100 kHz
t
sch
I
2
C clock high time 4 µ s
t
scl
I
2
C clock low time 4.7 µ s
t
sp
I
2
C spike time 100 ns
t
sds
I
2
C serial data setup time 250 ns
t
sdh
I
2
C serial data hold time 0 ns
t
icr
I
2
C input rise time 1 µ s
t
icf
I
2
C input fall time 0.3 µ s
t
ocf
I
2
C output fall time (10-pF to 400-pF bus) 300 ns
t
buf
I
2
C bus free time between stop and start 4.7 µ s
t
sts
I
2
C start or repeated start condition setup 4.7 µ s
t
sth
I
2
C start or repeated start condition hold 4 µ s
t
sps
I
2
C stop condition setup 4 µ s
t
vd
Valid data time SCL low to SDA output valid 3.4 µ s
C
b
I
2
C bus capacitive load 400 pF
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