English
Language : 

CAT9557 Datasheet, PDF (6/17 Pages) ON Semiconductor – 8-Bit I2C-Bus and SMBus I/O Port
◁
CAT9557
Table 5. A.C. CHARACTERISTICS (VDD = 2.3 V to 5.5 V; TA = −40°C to +85°C, unless otherwise specified.) (Note 8)
Standard−mode
I2C−bus
Fast−mode
I2C−bus
Parameter
SCL clock frequency
Bus free time between a STOP and START
condition (Note 9)
Symbol
fSCL
tBUF
Conditions
Min
Max
Min
Max
Unit
0
100
0
400
kHz
4.7
−
1.3
−
ms
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 (Note 10)
Data valid time (Note 11)
Data set−up time
LOW period of the SCL clock
HIGH period of the SCL clock
Fall time of both SDA and SCL signals
(Notes 9 and 12)
tHD;STA
tSU;STA
tSU;STO
tHD;DAT
tVD;ACK
tVD;DAT
tSU;DAT
tLOW
tHIGH
tf
4.0
−
0.6
−
ms
4.7
−
0.6
−
ms
4.0
−
0.6
−
ms
0
−
0
−
ns
−
1
−
0.9
ms
−
1
−
0.9
ms
250
−
100
−
ns
4.7
−
1.3
−
ms
4.0
−
0.6
−
ms
−
300
−
300
ns
Rise time of both SDA and SCL signals
tr
(Notes 9 and 12)
−
1000
−
300
ns
Noise pulse width suppressed at the
tSP
SCL and SDA inputs (Note 9)
−
50
−
50
ns
PORT TIMING
Data output valid time
tv(Q)
pin IO0
−
250
−
250
ns
pins IO1 to IO7
−
200
−
200
ns
Data input set−up time
Data input hold time
RESET TIMING
tsu(D)
th(D)
0
−
0
−
ns
200
−
200
−
ns
Reset pulse width
tw(rst)
6
−
6
−
ns
Reset recovery time
trec(rst)
0
−
0
−
ns
Reset time
trst
400
−
400
−
ns
8. Test conditions according to “AC Test Conditions” table.
9. This parameter is characterized initially and after a design or process change that affects the parameter. Not 100% tested.
10. tVD;ACK = time for acknowledgement signal from SCL LOW to SDA (out) LOW.
11. tVD;DAT = minimum time for SDA data out to be valid following SCL LOW.
12. Cb = total capacitance of one bus line in pF.
Table 6. A.C. TEST CONDITIONS
Input Rise and Fall time
CMOS Input Voltages
CMOS Input Reference Voltages
TTL Input Voltages
TTL Input Reference Voltages
Output Reference Voltages
Output Load: SDA, INT
Output Load: I/Os
≤ 10 ns
0.2 VDD to 0.8 VDD
0.3 VDD to 0.7 VDD
0.4 V to 2.4 V
0.8 V, 2.0 V
0.5 VDD
Current Souce IOL = 3 mA; CL = 100 pF
Current Source: IOL/IOH = 10 mA; CL = 50 pF
http://onsemi.com
6
 ▷