SN74AVCH4T245
4 BIT DUAL SUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3 STATE OUTPUTS
SCES577A 鈥?JUNE 2004 鈥?REVISED APRIL 2005
D
Control Inputs V
IH
/V
IL
Levels are
D
D
Referenced to V
CCA
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
D
I
off
Supports Partial-Power-Down Mode
D
D
D
Operation
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Protection Exceeds JESD 22
鈭?8000-V Human-Body Model (A114-A)
鈭?200-V Machine Model (A115-A)
鈭?1000-V Charged-Device Model (C101)
RGY PACKAGE
(TOP VIEW)
D, DGV, OR PWPACKAGE
(TOP VIEW)
V
CCA
V
CCA
1DIR
2DIR
1A1
1A2
2A1
2A2
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CCB
1OE
2OE
1B1
1B2
2B1
2B2
GND
1
16
15
1OE
14
2OE
13
1B1
12
1B2
11
2B1
10
2B2
1DIR
2DIR
1A1
1A2
2A1
2A2
2
3
4
5
6
7
8
9
GND
description/ordering information
This 4-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 1.2 V to 3.6 V. The B port is designed to track
V
CCB
. V
CCB
accepts any supply voltage from 1.2 V to 3.6 V. The SN74AVCH4T245 is optimized to operate with
V
CCA
/V
CCB
set at 1.4 V to 3.6 V. It is operational with V
CCA
/V
CCB
as low as 1.2 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 V
CCA
.
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.
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
錚?/div>
2005, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
GND
V
CCB
1
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