PCF8574_02 Datasheet, PDF (16/24 Pages) NXP Semiconductors – Remote 8-bit I/O expander for I2C-bus

Philips Semiconductors
Remote 8-bit I/O expander for I²C-bus
Product specification
PCF8574
11 I²C-BUS TIMING CHARACTERISTICS
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
I²C-bus timing (see Fig.16; note 1)
f_SCL
t_SW
t_BUF
t_SU;STA
t_HD;STA
t_LOW
t_HIGH
t_r
t_f
t_SU;DAT
t_HD;DAT
t_VD;DAT
t_SU;STO
SCL clock frequency
tolerable spike width on bus
bus free time
START condition set-up time
START condition hold time
SCL LOW time
SCL HIGH time
SCL and SDA rise time
SCL and SDA fall time
data set-up time
data hold time
SCL LOW to data out valid
STOP condition set-up time
−
−
−
−
4.7
−
4.7
−
4.0
−
4.7
−
4.0
−
−
−
−
−
250
−
0
−
−
−
4.0
−
100
kHz
100
ns
−
µs
−
µs
−
µs
−
µs
−
µs
1.0
µs
0.3
µs
−
ns
−
ns
3.4
µs
−
µs
Note
1. All the timing values are valid within the operating supply voltage and ambient temperature range and refer to V_IL
and V_IH with an input voltage swing of V_SS to V_DD.
handbook, full pagewidth
PROTOCOL
START
CONDITION
(S)
BIT 7
MSB
(A7)
BIT 6
(A6)
t _SU;STA
t _LOW t _HIGH
1 / f _SCL
SCL
t _BUF
tr
tf
SDA
BIT 0
LSB
(R/W)
ACKNOWLEDGE
(A)
STOP
CONDITION
(P)
t _HD;STA
t _SU;DAT
t _HD;DAT
t _VD;DAT
MBD820
t _SU;STO
2002 Nov 22
Fig.16 I²C-bus timing diagram.
16