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74LVCH8T245DBQRG4 Datenblatt(PDF) 1 Page - Texas Instruments

Teilenummer 74LVCH8T245DBQRG4
Bauteilbeschribung  8-BIT Dual-Supply Bus Transceiver
Download  33 Pages
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

74LVCH8T245DBQRG4 Datenblatt(HTML) 1 Page - Texas Instruments

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
SN74LVCH8T245
SCES637B – AUGUST 2005 – REVISED FEBRUARY 2016
SN74LVCH8T245 8-BIT Dual-Supply Bus Transceiver
With Configurable Level-Shifting, Voltage Translation, and 3-State Outputs
1
1 Features
1
Control Inputs (DIR and OE) VIH and VIL Levels
are Referenced to VCCA
Bus Hold on Data Inputs Eliminates the Need for
External Pullup and Pulldown Resistors
VCC Isolation
Fully Configurable Dual-Rail Design
Ioff Supports Partial-Power-Down Mode Operation
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Protection Exceeds JESD 22
2 Applications
Personal Electronics
Industrial
Enterprise
Telecommunications
3 Description
The SN74LVCH8T245 is an 8-bit noninverting bus
transceiver that uses two separate configurable
power-supply rails. The A port is designed to track
VCCA, which accepts any supply voltage from 1.65 V
to 5.5 V. The B port is designed to track VCCB, which
also accepts any supply voltage from 1.65 V to 5.5 V.
This allows for universal low-voltage bidirectional
translation between any of the 1.8-V, 2.5-V, 3.3-V,
and 5.5-V voltage nodes.
The SN74LVCH8T245 is designed for asynchronous
communication between two data buses. The logic
levels of the direction-control (DIR) input and the
output-enable (OE) input activate either the B-port
outputs, the A-port outputs, or place both output ports
into a high-impedance state. The device transmits
data from the A bus to the B bus when the B-port
outputs are activated, and from the B bus to the A
bus when the A-port outputs are activated. The input
circuitry on both A and B ports are always active.
The SN74LVCH8T245 is designed so that the control
pins (DIR and OE) are referenced to VCCA.
Active bus-hold circuitry holds unused or undriven
inputs at a valid logic state. Use of pullup or pulldown
resistors
with
the
bus-hold
circuitry
is
not
recommended.
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.
The VCC isolation feature ensures that if either VCCA
or VCCB is at GND, then the outputs are in the high-
impedance state.
To ensure the high-impedance state during power up
or power down, OE should be tied to VCCA through a
pullup resistor; the minimum value of the resistor is
determined by the current-sinking capability of the
driver.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SN74LVCH8T245
SSOP (24)
8.65 mm × 3.90 mm
TVSOP (24)
5.00 mm × 4.40 mm
TSSOP (24)
7.80 mm × 4.40 mm
VQFN (24)
5.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Logic Diagram (Positive Logic)


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