G3401
Global Mixed-mode Technology
Dual Bidirectional I2C Bus and SMBus Voltage-
Level Translator
is low, the translator switch is off, and a high-impedance
exists between ports.
Features
2-Bit Bidirectional Translator for SDA and SCL
Lines in Mix-Mode I2C Applications
I2C and SMBus Compatible
In I2C applications, the bus capacitance limit of 400pF
restricts the number of devices and bus length. The sys-
tem designer could isolate two halves of a bus by using
the G3401; thus, more I2C devices or longer trace length
can be accommodated.
Less than 1.5ns Maximum Propagation Delay to
Accommodate Standard-Mode and Fast-Model I2C
Devices and Multiple Masters
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 G3401 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.
Allows Voltage-Level Translator Between
1.2V VREF1 and 2.5V, 3.3V, 5V VREF2
1.8V VREF1 and 3.3V, 5V VREF2
3.3V VREF1 and 5V VREF2
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
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. Assuming the higher voltage
is on the SDA2 port, when the SDA2 port is high, the
voltage on the SDA1 port is limited to the voltage set by
VREF1. When the SDA1 is high the SDA2 port is pulled up
to the drain pull-up supply voltage (VDPU) by pull-up resis-
tors. This function allows a seamless translation between
higher and lower voltages selected by the user, without
any directional control. The SCL1/SCL2 channel works
like the SDA1/SDA2 channel.
High Impedance SCL1,SDA1,SCL2 and SDA2 Pins
for EN=Low
Lock-up-Free Operation for Isolation When EN=Low
General Description
The G3401 is a dual bidirectional I2C and SMBUS volt-
age-level translator with an enable (EN) input, and is op-
erational from 1.2V to 3.3V VREF1 and 2.5V to 5.5V VREF2
.
It allows bidirectional voltage translations between 1.2V
and 5V, without use of directional pin. The low ON-state
resistance (rON) 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 and SDA1 I/O
are connected to the SCL2 and SDA2 I/O, respectively,
allowing bidirectional data flow between ports. When EN
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 dis-
crete translation solutions, since the fabrication of the
switch is symmetrical.
Ordering Information
ORDER
TEMP.
RANGE
PACKAGE
(Green)
MARKING
REMARK
NUMBER
G3401V11U
G3401KC1G
G3401A91G
3401
3401
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
VSSOP-8
OBSOLETE
TDFN3X2-8
ADFN3X2-8
3401
34
1x
G3401A71U
-40°C to 85°C
AQFN1.5X1.5-8
Note: V1: VSSOP-8 KC: TDFN3X2-8 A9: ADFN3X2-8 A7: AQFN1.5X1.5-8
1: Bonding Code
U & G: Tape & reel
Pin Configuration
G3401
EN
G3401
G3401
G3401
GND
EN
VREF2
SCL2
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
EN
GND
VREF1
SCL1
VREF1
7
1
2
3
VREF2
SCL2
GND
VREF1
SCL1
EN
1
2
3
4
8
7
6
5
VREF1
SCL1
SDA1
VREF2
VREF2
SCL2
SDA2
Thermal
Pad
6
5
SCL1
SDA1
SCL2
SDA2
SDA2
SDA2
SDA1
SDA1
VSS
TDFN3X2-8
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
ADFN3X2-8
VSSOP-8
AQFN1.5X1.5-8
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.6
May 31, 2013
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