G3401 Datasheet, PDF (1/1 Pages) GTM CORPORATION – P-CHANNEL ENHANCEMENT MODE POWER MOSFET

Global Mixed-mode Technology
G3401
Dual Bidirectional I²C Bus and SMBus Voltage-
Level Translator
Features
„ 2-Bit Bidirectional Translator for SDA and SCL
Lines in Mix-Mode I²C Applications
„ 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 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 V_REF1 and 2.5V to 5.5V V_REF2 .
It allows bidirectional voltage translations between 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 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
exists between ports.
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.
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.
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
V_REF1. When the SDA1 is high the SDA2 port is pulled up
to the drain pull-up supply voltage (V_DPU) 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.
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
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
REMARK
G3401V11U
3401
-40°C to 85°C
VSSOP-8
OBSOLETE
G3401KC1G
3401
-40°C to 85°C
TDFN3X2-8
G3401A91G
3401
-40°C to 85°C
ADFN3X2-8
G3401A71U
34
1x
-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
G3401
G3401
G3401
EN
GND 1
VREF1 2
SCL1 3
SDA1 4
VSSOP-8
8 EN
EN 1
8 GND
VREF2 2
7 VREF2
6 SCL2
SCL2 3
Thermal
Pad
7 VREF1
6 SCL1
5 SDA2
SDA2 4
5 SDA1
TDFN3X2-8
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
GND 1
VREF1 2
SCL1 3
SDA1 4
ADFN3X2-8
8 EN _{VREF2 1}
7 VREF1
7 ^VREF2
SCL2 2
6 SCL2
6 SCL1
5 SDA2 ^{SDA2 3}
5 SDA1
VSS
AQFN1.5X1.5-8
Ver: 0.6
May 31, 2013
TEL: [phone]
http://www.gmt.com.tw
1