G3403 Datasheet, PDF (1/1 Pages) GTM CORPORATION – P-CHANNEL ENHANCEMENT MODE POWER MOSFET

Global Mixed-mode Technology
G3403
Bidirectional I²C Bus and SMBus Voltage Level
Translator
Features
„ 1-Bit Bidirectional Translator
„ I²C and SMBus Compatible
„ Less than 1.5ns Maximum Propagation Delay to
Accommodate Standard-Mode and Fast-Model
I²C Devices and Multiple Masters
„ Allows Voltage-Level Translator Between
Š 1.2V V_REF1 and 2.5V, 3.3V, 5V V_REF2
Š 1.8V V_REF1 and 3.3V, 5V V_REF2
Š 3.3V V_REF1 and 5V V_REF2
„ Provides Bidirectional Voltage
Translation
without Direction Pin
„ Low 3.5Ω ON-State Connection Between Input
and Output Ports Provides Less Signal Distortion
„ Open-Drain I²C I/O Ports
„ 5V Tolerant I²C I/O Ports to Support Mixed
Mode Signal Operation
„ High Impedance for SCL1 and SCL2 as EN=Low
„ Lock-up-Free Operation for Isolation When
EN=Low
General Description
The G3403 is a bidirectional I²C and SMBUS volt-
age-level translator with an enable (EN) input, and is
operational from 1.2V to 3.3V V_REF1 and 2.5V to 5.5V
V_REF2 . It allows bidirectional voltage translations be-
tween 1.2V and 5V, without use of directional pin. The
low ON-state resistance (r_ON) of the switch ensures the
connections to be with minimal propagation delay.
When EN is high, the translator switch is ON, and the
SCL1 I/O is connected to the SCL2 I/O, respectively,
allowing bidirectional data flow between ports. When
EN is low, the translator switch is off, and a
high-impedance exists between ports.
In I²C applications, the bus capacitance limit of 400pF
restricts the number of devices and bus length. The
system designer could isolate two halves of a bus by
using the G3403; thus, more I²C devices or longer
trace length can be accommodated.
In standard I²C system, pull-up resistors are required
to provide the logic high levels on the translator’s bus.
The size of these pull-up resistors depends on the
system, but each side of the repeater must have a
pull-up resistor. The G3403 is designed to work with
standard-mode and fast-mode I²C devices. Standard
mode I²C devices only specify 3mA in a generic I²C
system where standard mode devices and multiple
masters are possible. Under certain conditions, high
termination currents can be used.
When the SCL1 or SCL2 port is low, the clamp is in
the ON state, and a low resistance connection exists
between the SCL1 and SCL2 ports. Assuming the
higher voltage is on the SCL2 port, when the SCL2
port is high, the voltage on the SCL1 port is limited to
the voltage set by V_REF1. When the SCL1 is high, the
SCL2 port is pulled up to the drain pull-up supply volt-
age (V_DPU) by pull-up resistors. This function allows a
seamless translation between higher and lower volt-
ages selected by the user, without any directional con-
trol.
Ordering Information
ORDER
NUMBER
G3403TL1U
Note: TL: SC-70-6 (SOT-363)
1: Bonding Code
U: Tape & reel
Pin Configuration
MARKING
343x
TEMP.
RANGE
-40°C to +85°C
VREF1 1
G3403
6 VREF2
PACKAGE
(Green)
SC-70-6 (SOT-363)
VSS 2
5 EN
Ver: 0.1
May 29, 2013
SCL1 3
4 SCL2
SC-70-6 (SOT-363)
1
TEL: [phone]
http://www.gmt.com.tw