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ADG3308BRU
Low Voltage 1.2 V to 5.5 V, Bidirectional, Logic Level Translators
REV.PrE Feb 2004
PRELIMINARY TECHNICAL DATA
Low Voltage 1.2 V to 5.5 V,
Bidirectional, Logic Level Translators
FUNCTIONAL BLOCK DIAGRAMFEATURES
Bidirectional Level Translation
Operates from 1.2 V to 5.5 V
Low Quiescent Current <5µµµµµA
APPLICATIONS
SPITM, MicrowireTM and I2CTM Translation
Low Voltage ASIC level Translation
Smart Card Readers
Cell Phones & Cell-Phone Cradles
Portable Communication Devices
Telecommunicatons Equipment
Network Switches and Routers
Storage Systems (SAN/NAS)
Computing/Server Applications
GPS
Portable POS Systems
Low Cost Serial Interfaces
GENERAL DESCRIPTIONThe ADG3308 is an 8-Channel bidirectional level transla-
tor. Its function is to provide level shifting in a multi-
voltage system. The voltage applied to VCCA sets up the
logic levels on the A side of the device, while VCCY sets
the levels on the Y side. In this way, signals applied to the
VCCA side of the device appear as VCCY compatible logic
on the other side of the device and vice versa as the device
is designed to handle bidirectional signals. The device is
guaranteed for operation over the supply range 1.2 V to
5.5 V.
These devices are suited to applications like data transfer
between a low voltage DSP/Controller and a higher
voltage device. Other applications include high end
consumer products where constant changes to the chipset
desgins result in multiple supply levels in the application.
VCCY operates from +1.65 to 5.5 V while VCCA from +1.2
to VCCY. VCCA must always operate from a supply that is
lower than VCCY. When the device Enable pin (EN) is
pulled low, the Ax and Yx inputs/outputs are tri-stated.
The EN pin is driven high for normal operation. EN pin
is referred to VCCY voltage.
PRODUCT HIGHLIGHTSBidirectional Level Translation.The ADG3308 is fully guaranteed from 1.2 V to
5.5 V supply range.20 lead TSSOP and LFCSP (4mm x4mm) packages.
Y1
GND
VCCYVCCAY8Y7Y6Y5Y4Y3Y2
ADG3308–SPECIFICATIONS1
PRELIMINARY TECHNICAL DATA
(VCCY = +1.65 to 5.5 V, VCCA = +1.1 to VCCY, GND = 0 V, All specifications TMIN to TMAX unless otherwise noted)
PRELIMINARY TECHNICAL DATA
ABSOLUTE MAXIMUM RATINGS1(TA = 25°C unless otherwise noted)
VCCY to GND . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 V to +7 V
VCCA to GND . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 V to +7 V
Digtal Inputs (A) . . . . . . . . . . . . . .-0.3 V to (VCCA +0.3V)
Digtal Inputs (Y) . . . . . . . . . . . . . .-0.3 V to (VCCY +0.3V)
EN to GND . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 V to +7 V
Operating Temperature Range
Industrial (B Version) . . . . . . . . . . . . . .–40°C to +85°C
Storage Temperature Range . . . . . . . . .–65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . 150°C
20 Lead TSSOP
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . .143°C/W
20 Lead LFCSP - 4 layer board
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . .32°C/W
Lead Temperature, Soldering (10seconds) . . . . . . .300°C
IR Reflow, Peak Temperature (<20 seconds) . . .+235°C
NOTESStresses above those listed under Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only; functional
operation of the device at these or any other conditions above those listed
in the operational sections of this specifcation is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect
device reliability. Only one absolute maximum rating may be applied at
any one time.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADG3308 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper
ESD precautions are recommended to avoid performance degradation or loss of
functionality.
ORDERING GUIDE
Pin Configuration
20 Lead TSSOP (RU-20)
20 Lead 4mmx4mm LFCSP(CP-20)
ADG3308
PRELIMINARY TECHNICAL DATA
GENERAL DESCRIPTIONThe ADG3308 level translator allows the required level
shifting necessary for data transfer in a system where mul-
tiple voltages are used. The device requires two supplies,
VCCA and VCCY. These supplies set the logic levels on
each side of the device. The device translates data present
on the VA side of the device to the higher voltage level at
the VY side of the device. Similarly, as the device is ca-
pable of bidirectional translation, data applied to the VY
side will be translated to the voltage referenced to VA.
Power SuppliesThe voltage applied to VCCA must always be less than or
equal to VCCY.
While EN is low, the VCCA supply may be removed, and
both A and Y I/O’s will remain tri-stated.
Level Translator ArchitectureThe forward channel consists of a string of inverters and a
level translator, while the reverse channel consists simply
of inverters. A level translator is not required in the re-
verse path (Y-A) as the supply voltage VCCY must always
be greater than or equal to VCCA. A current limiting resis-
tor is used in series with each channel to prevent any con-
tention issues, see figure 1.
Figure 1. Simplified Functional Diagram of one channel.
As the driven side has to drive a load capacitance through
this 6k resistance, one shot generators are used to drive
large mos devices in the output stage to help speed up the
rate of switching. The output stage is inactive and three
state except when transistions are present on either side of
the translator. When this happens the one shot fires turn-
ing on the output stage and driving the load capacitance
faster than if it were driven through the resistor. As the
device is bi-directional, both input stages will be active
during this period. While this design gives maximum
speed from the device, it can result in some current driv-
ing back into the source driving the input of the translator.
To ensure correct operation, the input driver should meet
the following requirements - 50 Ω maximum output im-
pedance with minimum of 20mA output current when
driving 20Mbps.
Enable OperationWhen pulled low, the EN input allows the user to tri-state
both sides (A and Y) of the level translator. EN pin is
referred to VCCY voltage.
PRELIMINARY TECHNICAL DATA
OUTLINE DIMENSIONSDimensions shown in inches and (mm).
20-Lead TSSOP
(RU-20)
20-Lead LFCSP
(CP-20)
BOTTOM
VIEW
0.024 (0.60)
0.017 (0.42)
0.009 (0.24)
0.024 (0.60)
0.017 (0.42)
0.009 (0.24)
0.030 (0.75)
0.024 (0.60)
0.020 (0.50)
0.012 (0.30)
0.009 (0.23)
0.007 (0.18)
0.080 (2.00)
REF
0.010 (0.25)
MIN
0.020 (0.50)
BSCo MAX
0.008 (0.20)
REF
0.028 (0.70) MAX
0.026 (0.65) NOM
0.002 (0.05)
0.0004 (0.01)
0.0 (0.0)
0.035 (0.90) MAX
0.033 (0.85) NOM
SEATING
PLANE
CONTROLLING DIMENSIONS ARE IN MILLIMETERS
PIN 1
INDICATORTOP
VIEW
0.148 (3.75)
BSC SQ
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