PCA9555_8
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 08 — 22 October 2009
21 of 34
NXP Semiconductors
PCA9555
16-bit I2C-bus and SMBus I/O port with interrupt
12. Test information
Fig 23. Denition of timing on the I2C-bus
tSP
tBUF
tHD;STA
P
S
tLOW
tr
tHD;DAT
tf
tHIGH
tSU;DAT
tSU;STA
Sr
tHD;STA
tSU;STO
SDA
SCL
002aaa986
RL = load resistor.
CL = load capacitance includes jig and probe capacitance.
RT = termination resistance should be equal to the output impedance of Zo of the pulse generators.
Fig 24. Test circuitry for switching times
Fig 25. Load circuit
PULSE
GENERATOR
VO
CL
50 pF
RL
500
002aab284
RT
VI
VDD
DUT
VDD
open
GND
CL
50 pF
002aac226
RL
500
from output under test
2VDD
open
GND
S1
RL
500
