Datasheet

PCA9500_4 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 04 — 15 April 2009 15 of 26
NXP Semiconductors
PCA9500
8-bit I
2
C-bus and SMBus I/O port with 2-kbit EEPROM
Remark: Rapid fall-off in V
OH
at current inception is due to a diode that provides 5 V
overvoltage protection for the GPIO I/O pins. When the GPIO I/O are being used as
inputs, the internal current source V
OH
should be evaluated to determine if external pull-up
resistors are required to provide sufficient V
IH
threshold noise margin.
a. T
amb
= −40 °Cb.T
amb
=25°C
c. T
amb
=85°C
Fig 21. V
OH
versus I
OH
−160
−40
20
I
OH
(µA)
V
OH
(V)
0 3.61.2 2.4
002aad307
V
DD
= 2.5 V
2.7 V
3.0 V
3.3 V
3.6 V
−100
−140
−20
−60
−100
20
I
OH
(µA)
V
OH
(V)
0 3.61.2 2.4
002aad308
V
DD
= 2.5 V
2.7 V
3.0 V
3.3 V
3.6 V
−140
−20
−60
−100
20
I
OH
(µA)
V
OH
(V)
0 3.61.2 2.4
002aad309
V
DD
= 2.5 V
2.7 V
3.0 V
3.3 V
3.6 V