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SCES485A − AUGUST 2003 − REVISED JUNE 2004
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
C0068 Member of the Texas Instruments
Widebus+ Family
C0068 DOC Circuitry Dynamically Changes
Output Impedance, Resulting in Noise
Reduction Without Speed Degradation
C0068 Dynamic Drive Capability Is Equivalent to
Standard Outputs With I
OH
and I
OL
of
− ±24 mA at 3-V V
CC
− ±15 mA at 2.3-V V
CC
− ±9 mA at 1.65-V V
CC
− ±6 mA at 1.4-V V
CC
C0068 Control Inputs V
IH
/V
IL
Levels are
Referenced to V
CCB
Voltage
C0068 If Either V
CC
Input Is at GND, Both Ports
Are in the High-Impedance State
C0068 Inputs/Outputs Can Tolerate Up to 4.6 V,
Which Allows Mixed-Voltage-Mode Data
Communications
C0068 I
off
Supports Partial-Power-Down Mode
Operation
C0068 Fully Configurable Dual-Rail Design Allows
Each Port to Operate Over the Full 1.4-V to
3.6-V Power-Supply Range
C0068 Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
C0068 ESD Protection Exceeds JESD 22
− 2000-V Human-Body Model (A114-A)
− 200-V Machine Model (A115-A)
− 1000-V Charged-Device Model (C101)
description/ordering information
This 32-bit noninverting bus transceiver uses two separate configurable power-supply rails. The A port is
designed to track V
CCA
. V
CCA
accepts any supply voltage from 1.4 V to 3.6 V. The B port is designed to track
V
CCB
. V
CCB
accepts any supply voltage from 1.4 V to 3.6 V. This allows for universal low-voltage bidirectional
translation between any of the 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.
The SN74AVCB324245 is designed for asynchronous communication between data buses. The device
transmits data 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 outputs so the buses are
effectively isolated.
The SN74AVCB324245 is designed so that the control pins (1DIR, 2DIR, 1OE, and 2OE) are supplied by V
CCB
.
To ensure the high-impedance state during power up or power down, OE shall be tied to V
CCB
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
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. If either V
CC
input is at GND,
both ports are in the high-impedance state.
ORDERING INFORMATION
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
−40°C to 85°C
LFBGA − GKE
Tape and reel
SN74AVCB324245KR
WD4245
LFBGA − ZKE (Pb-free) 74AVCB324245ZKER
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright  2004, Texas Instruments Incorporated
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.
DOC and Widebus+ are trademarks of Texas Instruments.
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