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PARAMETER MEASUREMENT INFORMATION
t
PLH
/t
PHL
V
CC
TEST S1
C
L
(see Note C)
TEST CIRCUIT FOR OPEN-DRAIN OUTPUT
S1
GND
R
L
(see Note B)
V
CC
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
PULSE
GENERATOR
DUT
R
T
(see Note A)
V
CC
V
IN
V
OUT
0.4 V
0.4 V
0.52 V
Input SDA
or SCL
EXPSDA1 or
EXPSCL1
EXPSDA2 or
EXPSCL2
Output SDA
or SCL
t
PLHs
t
TLHs
0.7 V
CC
0.3 V
CC
0.5 V
CC
0.5 V
CC
0.7 V
CC
0.5 V
CC
0.5 V
CC
0.3 V
CC
0.3 V
CC
0.7 V
CC
t
TLHs
t
THLs
0.7 V
CC
t
PHLs
Effective
Stretch
t
PHLE1s
t
THLs
0.3 V
CC
t
PLHE1s
t
PLHE2s
PCA9518
EXPANDABLE FIVE-CHANNEL I
2
C HUB
SCPS132A – JUNE 2006 – REVISED JULY 2007
A. Termination resistance, R
T
, should be equal to the Z
OUT
of the pulse generators.
B. Load resistor, R
L
= 1.1 k Ω for I
2
C and 500 Ω for EXP
C. Load capacitance, C
L
, includes jig and probe capacitance; 100 pF for I
2
C and EXP.
D. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z
O
= 50 Ω ,
slew rate ≥ 1 V/ns.
E. The outputs are measured one at a time, with one transition per measurement.
Figure 2. Test Circuit and Voltage Waveforms
9
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