参数资料
型号: PCA8574TS,118
厂商: NXP Semiconductors
文件页数: 9/32页
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 20SSOP
特色产品: NXP - I2C Interface
标准包装: 1
接口: I²C
输入/输出数: 8
中断输出:
频率 - 时钟: 400kHz
电源电压: 2.3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-LSSOP(0.173",4.40mm 宽)
供应商设备封装: 20-SSOP
包装: 标准包装
包括: POR
其它名称: 568-8700-6
PCA8574_PCA8574A
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 3 June 2013
17 of 32
NXP Semiconductors
PCA8574; PCA8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
14. Dynamic characteristics
[1]
tVD;ACK = time for Acknowledgement signal from SCL LOW to SDA (out) LOW.
[2]
tVD;DAT = minimum time for SDA data out to be valid following SCL LOW.
[3]
A master device must internally provide a hold time of at least 300 ns for the SDA signal (refer to the VIL of the SCL signal) in order to
bridge the undefined region SCL’s falling edge.
[4]
The maximum tf for the SDA and SCL bus lines is specified at 300 ns. The maximum fall time for the SDA output stage tf is specified at
250 ns. This allows series protection resistors to be connected between the SDA and the SCL pins and the SDA/SCL bus lines without
exceeding the maximum specified tf.
[5]
Cb = total capacitance of one bus line in pF.
[6]
Input filters on the SDA and SCL inputs suppress noise spikes less than 50 ns.
Table 10.
Dynamic characteristics
VDD = 2.3 V to 5.5 V; VSS =0V; Tamb = 40 Cto+85 C; unless otherwise specified. Limits are for Fast-mode I2C-bus.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fSCL
SCL clock frequency
0
-
400
kHz
tBUF
bus free time between a STOP and START
condition
1.3
-
s
tHD;STA
hold time (repeated) START condition
0.6
-
s
tSU;STA
set-up time for a repeated START condition
0.6
-
s
tSU;STO
set-up time for STOP condition
0.6
-
s
tHD;DAT
data hold time
0
-
ns
tVD;ACK
data valid acknowledge time
[1] 0.1
-
0.9
s
tVD;DAT
data valid time
--ns
tSU;DAT
data set-up time
100
-
ns
tLOW
LOW period of the SCL clock
1.3
-
s
tHIGH
HIGH period of the SCL clock
0.6
-
s
tf
fall time of both SDA and SCL signals
[3][4] 20 + 0.1Cb[5] -
300
ns
tr
rise time of both SDA and SCL signals
20 + 0.1Cb[5] -
300
ns
tSP
pulse width of spikes that must be
suppressed by the input filter
-
50
ns
Port timing; CL 100 pF (see Figure 8 and Figure 9)
tv(Q)
data output valid time
-
4
s
tsu(D)
data input set-up time
0
-
s
th(D)
data input hold time
4
-
s
Interrupt timing; CL 100 pF (see Figure 8 and Figure 9)
tv(INT)
valid time on pin INT
from port to INT
--
4
s
trst(INT)
reset time on pin INT
from SCL to INT
--
4
s
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