PI6ULS5V9306 Datasheet, PDF (1/14 Pages) Pericom Semiconductor Corporation – SMBus voltage-level translator

PI6ULS5V9306
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Dual bidirectional I²C-bus and SMBus voltage-level translator
Features
 2-bit bidirectional translator for SDA and SCL lines
in mixed-mode I2C-bus applications
 Standard-mode, Fast-mode, and Fast-mode Plus
I2C-bus and SMBus compatible
 Less than 1.5 ns maximum propagation delay to
accommodate Standard mode and Fast mode I2C-
bus devices and multiple masters
 Allows voltage level translation between:
 0.9V VREF1 and 1.8 V, 2.5 V, 3.3 V or 5 V
VREF2
 1.2 V VREF1 and 1.8 V, 2.5 V, 3.3 V or 5 V
VREF2
 1.5 V VREF1 and 2.5 V, 3.3 V or 5 V VREF2
 1.8 V VREF1 and 3.3 V or 5 V VREF2
 2.5 V VREF1 and 5 V VREF2
 3.3 V VREF1 and 5 V VREF2
 Provides bidirectional voltage translation with no
direction pin
 Low 3.5 ohm
-state connection between input
and output ports provides less signal distortion
 Open-drain I2C-bus I/O ports (SCL1, SDA1, SCL2
and SDA2)
 5 V tolerant I2C-bus I/O ports to support mixed-
mode signal operation
 High-impedance SCL1, SDA1, SCL2 and SDA2
pins for EN = LOW
 Lock-up free operation for isolation when EN =
LOW
 Flow through pin out for ease of printed-circuit
board trace routing
 ESD protection exceeds 4KV HBM per JESD22-
A114
 Package: TDFN2x3-8L, MSOP-8L,SOIC-8L

Description
The PI6ULS5V9306 is a dual bidirectional I²C-bus
and SMBus voltage-level translator with an enable (EN)
input, and is operational from 1.0 V to 3.3 V (VREF1)
and 1.8 V to 5.5 V(VREF2).
The PI6ULS5V9306 allows bidirectional voltage
translations between 1.0 V and 5 V without the use of a
direction pin. The low ON-state resistance (Ron) of the
switch allows connections to be made with minimal
propagation delay. When EN is HIGH, the translator
switch is on, and the SCL1 and SDA1 I/O are connected
to the SCL2 and SDA2 I/O respectively, allowing
bidirectional data flow between ports. When EN is LOW,
the translator switch is off, and a high-impedance state
exists between ports.
The PI6ULS5V9306 is not a bus buffer that provides
both level translation and physically isolates to either
side of the bus when both sides are connected. The
PI6ULS5V9306 only isolates both sides when the device
is disabled and provides voltage level translation when
active.
The PI6ULS5V9306 can also be used to run two
buses, one at 400 kHz operating frequency and the other
at 100 kHz operating frequency. If the two buses are
operating at different frequencies, the 100 kHz bus must
be isolated when the 400 kHz operation of the other bus
is required. If the master is running at 400 kHz, the
maximum system operating frequency may be less than
400 kHz because of the delays added by the translator.
As with the standard I²C-bus system, pull-up
resistors are required to provide the logic HIGH levels
on the translator’s bus. The PI6ULS5V9306 has a
standard open-collector configuration of the I²C-bus.
The size of these pull-up resistors depends on the system,
but each side of the translator must have a pull-up
resistor. The device is designed to work with Standard-
mode, Fast-mode and Fast mode Plus I²C-bus devices in
addition to SMBus devices.
When the SDA1 or SDA2 port is LOW, the clamp is
in the ON-state and a low resistance connection exists
between the SDA1 and SDA2 ports. When the higher
voltage is on the SDA2 port, and the SDA2 port is
HIGH , the voltage on the SDA1 port is limited to the
voltage set by VREF1. When the SDA1 port is HIGH,
the SDA2 port is pulled to the drain pull-up supply
voltage (VDPU) by the pull-up resistors. This
functionality allows a seamless translation between
higher and lower voltages selected by the user without
the need for directional control. The SCL1/SCL2
channel also functions as the SDA1/SDA2 channel.
All channels have the same electrical characteristics
and there is minimal deviation from one output to
another in voltage or propagation delay. This is a benefit
over discrete transistor voltage translation solutions,
since the fabrication of the switch is symmetrical. The
translator provides excellent ESD protection to lower
voltage devices, and at the same time protects less ESD-
resistant devices.
2015-08-0006
PT0451-5 8/18/15
1