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PCF8570 View Datasheet(PDF) - NXP Semiconductors.

Part Name
Description
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PCF8570 Datasheet PDF : 20 Pages
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Philips Semiconductors
256 × 8-bit static low-voltage RAM with
I2C-bus interface
Product specification
PCF8570
12 AC CHARACTERISTICS
All timing values are valid within the operating supply voltage and ambient temperature range and reference to VIL and
VIH with an input voltage swing of VSS to VDD.
SYMBOL
PARAMETER
MIN. TYP. MAX. UNIT
I2C-bus timing (see Fig.10; note 1)
fSCL
tSP
tBUF
tSU;STA
tHD;STA
tLOW
tHIGH
tr
tf
tSU;DAT
tHD;DAT
tVD;DAT
tSU;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. A detailed description of the I2C-bus specification, with applications, is given in brochure “The I2C-bus and how to
use it”. This brochure may be ordered using the code 9398 393 40011.
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
1999 Jan 06
Fig.10 I2C-bus timing diagram; rise and fall times refer to VIL and VIH.
10
 

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