SN74AVCH4T245
4ĆBIT DUALĆSUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3ĆSTATE OUTPUTS
SCES577 – JUNE 2004
D Control Inputs VIH/VIL Levels are
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
1
VCCB
1OE
2OE
1B1
1B2
2B1
2B2
GND
1DIR
2DIR
1A1
1A2
2A1
2A2
16
15 1OE
14 2OE
2
3
5
13 1B1
12 1B2
6
11 2B1
4
10 2B2
7
8
9
description/ordering information
This 4-bit noninverting bus transceiver uses two separate configurable power-supply rails. The A port is
designed to track VCCA. VCCA accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track
VCCB. VCCB accepts any supply voltage from 1.2 V to 3.6 V. This allows for universal low-voltage bidirectional
translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.
The SN74AVCH4T245 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 SN74AVCH4T245 is designed so that the control pins (1DIR, 2DIR, 1OE, and 2OE) are supplied by VCCA.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
ORDERING INFORMATION
PACKAGE†
TA
QFN − RGY
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
SSOP − DB
TSSOP − PW
TVSOP − DGV
SN74AVCH4T245D
Tape and reel
SN74AVCH4T245DR
Tape and reel
SN74AVCH4T245DBR
Tube
−40 C 85°C
−40°C to 85 C
SN74AVCH4T245RGYR
Tube
SOIC − D
Tape and reel
SN74AVCH4T245PW
Tape and reel
SN74AVCH4T245PWR
Tape and reel
SN74AVCH4T245DGVR
† 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.
Copyright 2004, Texas Instruments Incorporated
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
PRODUCT PREVIEW
1
GND
VCCA
1DIR
2DIR
1A1
1A2
2A1
2A2
GND
RGY PACKAGE
(TOP VIEW)
VCCA
D, DB, DGV, OR PW PACKAGE
(TOP VIEW)
VCCB
D
D
Operation
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
GND
D
D Ioff Supports Partial-Power-Down Mode
Referenced to VCCA Voltage
Fully Configurable Dual-Rail Design Allows
Each Port to Operate Over the Full 1.2-V to
3.6-V Power-Supply Range
I/Os Are 4.6-V Tolerant
