Datasheet

PCA9508_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 28 April 2008 2 of 21
NXP Semiconductors
PCA9508
Hot swappable level translating I
2
C-bus repeater
This prevents a lock-up condition from occurring. The output pull-down on the A side
drives a hard LOW and the input level is set at 0.5V
CC(A)
to accommodate the need for a
lower LOW level in systems where the low voltage side supply voltage is as low as 0.9 V.
Table 1 shows the comparison between PCA9508 and I
2
C-bus repeaters.
[1] PCA9517A is the high ESD (6.5 kV HBM and 550 V MM) drop-in replacement for PCA9517.
2. Features
n 2 channel, bidirectional buffer isolates capacitance and allows 400 pF on either side of
the device
n Supports offset-free hot-swap with IDLE/STOP detect circuitry
n Voltage level translation from 0.9 V to 5.5 V and from 2.7 V to 5.5 V
n Footprint and functional replacement for PCA9515, PCA9515A, PCA9517 and
PCA9517A
n I
2
C-bus and SMBus compatible
n Active HIGH repeater enable input
n Static level offset on B side
n Open-drain input/outputs
n Lock-up free operation
n Supports arbitration and clock stretching across the repeater
n Accommodates Standard-mode and Fast-mode I
2
C-bus devices and multiple masters
n Powered-off high-impedance I
2
C-bus pins
n A side operating supply voltage range of 0.9 V to 5.5 V
n B side operating supply voltage range of 2.7 V to 5.5 V
n 5 V tolerant I
2
C-bus and enable pins
n 0 Hz to 400 kHz clock frequency (the maximum system operating frequency may be
less than 400 kHz because of the delays added by the repeater).
n ESD protection exceeds 6000 V HBM per JESD22-A114, 450 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
n Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
n Packages offered: SO8 and TSSOP8
Table 1. PCA9508 and I
2
C-bus repeaters comparison
Feature PCA9507 PCA9508 PCA9509 PCA9517A
[1]
PCA9519
V
CC(A)
range (V) 2.7 to 5.5 0.9 to 5.5 1.1 to V
CC(B)
− 1 0.9 to 5.5 1.1 to V
CC(B)
− 1
V
CC(B)
range (V) 2.7 to 5.5 2.7 to 5.5 3.0 to 5.5 2.7 to 5.5 3.0 to 5.5
rise time
accelerator
yes - - - -
idle/stop detect
for hot-swap
- yes - - -
normal I/O A side A side B side A side B side
static level offset B side B side A side B side A side