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DESCRIPTION/ORDERING INFORMATION
SN74LVCHR32245A
32-BIT BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCES601 – AUGUST 2004 – REVISED SEPTEMBER 2005
• Member of the Texas Instruments Widebus+ ™ • I off Supports Partial-Power-Down Mode
Family Operation
• Operates From 1.65 V to 3.6 V • Supports Mixed-Mode Signal Operation on All
Ports (5-V Input/Output Voltage With 3.3-V• Inputs Accept Voltages to 5.5 V
V CC )• Max t
pd of 4.8 ns at 3.3 V • Other Products to Consider: SN74LVC32245,
• Input and Output Ports Have Equivalent 26- Ω SN74LVCH32245A, SN74LVCR32245A
Series Resistors, So No External Resistors
• Latch-Up Performance Exceeds 250 mA PerAre Required
JESD 17• Typical V
OLP (Output Ground Bounce) <0.8 V • ESD Protection Exceeds JESD 22at V
CC = 3.3 V, T A = 25 ° C – 2000-V Human-Body Model (A114-A)
• Typical V OHV (Output V OH Undershoot) >2 V at
V CC = 3.3 V, T A = 25 ° C – 200-V Machine Model (A115-A)
• Bus Hold on Data Inputs Eliminates the Need – 1000-V Charged-Device Model (C101)
for External Pullup/Pulldown Resistors
This 32-bit (quad-octal) noninverting bus transceiver is designed for 1.65-V to 3.6-V V CC operation.
The SN74LVCHR32245A is designed for asynchronous communication between data buses. The
control-function implementation minimizes external timing requirements.
This device can be used as four 8-bit transceivers, two 16-bit transceivers, or one 32-bit transceiver. It allows
data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the
direction-control (DIR) input. The output-enable ( OE ) input can be used to disable the device so that the buses
are effectively isolated.
The data I/Os and control inputs are overvoltage tolerant. This feature allows the use of this device for down
translation in a mixed-voltage environment.
The outputs, which are designed to sink up to 12 mA, include equivalent 26- Ω resistors to reduce overshoot and
undershoot.
This device is fully specified for partial-power-down applications using I off . The I off circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
To ensure the high-impedance state during power up or power down, OE should be tied to V CC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or
pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input
circuit and is not disabled by OE or DIR.
ORDERING INFORMATION
T A PACKAGE (1) ORDERABLE PART NUMBER TOP-SIDE MARKING
LFBGA – GKE SN74LVCHR32245AKR– 40 ° C to 85 ° C Tape and reel LQ245A
LFBGA – ZKE (Pb-free) 74LVCHR32245AZKER
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Widebus+ is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date. Copyright © 2004 – 2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.