Datasheet
PCA9509P All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 3 — 19 July 2013 11 of 25
NXP Semiconductors
PCA9509P
Low power level translating I
2
C-bus/SMBus repeater
[2] Care must be taken to minimize the resistance in series with the ground pin of the PCA9509P to the ground reference point of the V
CC(A)
supply because there is only 80 mV margin between the power good threshold and the 0.8 V minimum supply voltage at cold
temperature (40 C). Because the B-side I
OL
of up to 30 mA flows through the resistance causing a voltage drop that effectively
reduces the V
CC(A)
to chip ground voltage and when V
CC(A)
is less than the power good voltage ~0.72 V, the PCA9509P is disabled. For
example, if the resistance is 1.4 , then 1.4 60 mA = 84 mV and 0.8 V 0.084 V = 0.716 V, which is less than the power good
threshold, so the PCA9509P disables when both outputs drive LOW.
[3] As long as the chip ground is common with the input ground reference the driver resistance may be as large as 120 . However, ground
offset rapidly decreases the maximum allowed driver resistance.
[4] Guaranteed by design.
10. Dynamic characteristics
[1] Load capacitance = 50 pF; load resistance on port B = 1.35 k. Port A = 1.35 k, and an input falling slew rate of 0.05 V/ns.
[2] Typical values were measured with V
CC(A)
= 1.1 V, V
CC(B)
= 3.3 V at T
amb
=25C.
[3] Enable pin (EN) should only change state when the bus and the repeater port are in an idle state. That is, the t
en
should be considered
the set-up time before START and t
dis
should be considered the hold time after STOP.
Table 7. Dynamic characteristics
V
CC(A)
= 0.8 V to 1.5 V; V
CC(B)
= 2.3 V to 5.5 V; GND = 0 V; T
amb
=
40
C to +85
C; unless otherwise specified.
[1]
Symbol Parameter Conditions Min Typ
[2]
Max Unit
t
PLH
LOW to HIGH propagation delay port B to port A
[1]
70 110 180 ns
t
PHL
HIGH to LOW propagation delay port B to port A
[1]
104 156 270 ns
SR
f
falling slew rate port A; 0.7V
CC(A)
to 0.3V
CC(A)
[1]
0.007 0.015 0.036 V/ns
t
PLH
LOW to HIGH propagation delay port A to port B
[1]
72 110 175 ns
t
PLH2
LOW to HIGH propagation delay 2 port A to port B;
measured from 0.15V
CC(A)
on port A
to 0.5V
CC(B)
on port B
[1]
61 98 266 ns
t
PHL
HIGH to LOW propagation delay port A to port B
[1]
52 89 226 ns
SR
f
falling slew rate port B; 0.7V
CC(B)
to 0.3V
CC(B)
[1]
0.02 0.05 0.1 V/ns
t
en
enable time EN HIGH to enabled
[3]
10 - - s
t
dis
disable time EN LOW to disabled
[3]
300 - - ns