pca9557bs NXP Semiconductors, pca9557bs Datasheet - Page 16

• Manufacturer Part Number: pca9557bs
• Description: 8-bit I2c And Smbus I/0 Port With Reset
• Manufacturer: NXP Semiconductors

NXP Semiconductors
12. Dynamic characteristics
Table 11.
[1]
[2]
[3]
PCA9557_5
Product data sheet
Symbol
f
t
t
t
t
t
t
t
t
t
t
t
t
t
Port timing
t
t
t
Reset timing
t
t
t
SCL
BUF
HD;STA
SU;STA
SU;STO
HD;DAT
VD;ACK
VD;DAT
SU;DAT
LOW
HIGH
f
r
SP
v(Q)
su(D)
h(D)
w(rst)
rec(rst)
rst
t
t
C
VD;ACK
VD;DAT
b
= total capacitance of one bus line in pF.
= minimum time for SDA data out to be valid following SCL LOW.
= time for acknowledgement signal from SCL LOW to SDA (out) LOW.
Parameter
SCL clock frequency
bus free time between a STOP and
START condition
hold time (repeated) START condition
set-up time for a repeated START
condition
set-up time for STOP condition
data hold time
data valid acknowledge time
data valid time
data set-up time
LOW period of the SCL clock
HIGH period of the SCL clock
fall time of both SDA and SCL signals
rise time of both SDA and SCL signals
pulse width of spikes that must be
suppressed by the input filter
data output valid time
data input set-up time
data input hold time
reset pulse width
reset recovery time
reset time
Dynamic characteristics
Rev. 05 — 12 September 2007
Conditions
pin IO0
pins IO1 to IO7
[1]
[2]
8-bit I
Standard-mode
Min
250
200
400
4.7
4.0
4.7
4.0
4.7
4.0
0
0
0
4
0
-
-
-
-
-
-
-
I
2
2
C-bus
C-bus and SMBus I/O port with reset
1000
Max
100
300
250
200
50
1
1
-
-
-
-
-
-
-
-
-
-
-
-
-
20 + 0.1C
20 + 0.1C
Fast-mode I
Min
100
200
400
1.3
0.6
0.6
0.6
1.3
0.6
0
0
0
4
0
-
-
-
-
-
PCA9557
© NXP B.V. 2007. All rights reserved.
b
b
[3]
[3]
2
C-bus
Max
400
300
300
250
200
0.9
0.9
50
-
-
-
-
-
-
-
-
-
-
-
-
-
16 of 26
Unit
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s
s
s
s
s
s
s
s