SN74AXC8T245 Transceiver Datasheet

SN74AXC8T245 Datasheet PDF, Equivalent


Part Number

SN74AXC8T245

Description

8-Bit Dual-Supply Bus Transceiver

Manufacture

etcTI

Total Page 30 Pages
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SN74AXC8T245
SCES875B – MARCH 2018 – REVISED AUGUST 2018
SN74AXC8T245 8-Bit Dual-Supply Bus Transceiver With Configurable Voltage Translation
and Tri-State Outputs
1 Features
1 Qualified Fully Configurable Dual-Rail Design
Allows Each Port to Operate With a Power Supply
Range From 0.65 V to 3.6 V
• Operating Temperature From –40°C to +125°C
• Multiple Direction Control Pins to Allow
Simultaneous Up and Down Translation
• Up to 380 Mbps Support When Translating from
1.8 V to 3.3 V
• VCC Isolation Feature to Effectively Isolate Both
Buses in a Power-Down Scenario
• Partial Power-Down Mode to Limit Backflow
Current in a Power-Down Scenario
• Compatible With SN74AVC8T245 and
74AVC8T245 Level Shifters
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
• ESD Protection Exceeds JESD 22
– 8000-V Human-Body Model
– 1000-V Charged-Device Model
2 Applications
• Enterprise and Communications
• Industrial
• Personal Electronics
• Wireless Infrastructure
• Building Automation
• Point of Sale
The SN74AXC8T245 device 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 of the direction-control inputs (DIR1 and
DIR2). The output-enable (OE) input is used to
disable the outputs so the buses are effectively
isolated.
The SN74AXC8T245 device is designed so the
control pins (DIR and OE) are referenced to VCCA.
This device is fully specified for partial-power-down
applications using Ioff. The Ioff circuitry disables the
outputs when the device is powered down. This
inhibits current backflow into the device which
prevents damage to the device.
The VCC isolation feature ensures that if either VCC
input supply is below 100 mV, all level shifter outputs
are disabled and placed into a high-impedance state.
To ensure the high-impedance state of the level
shifter I/Os 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)
SN74AXC8T245PW
TSSOP (24) 4.40 mm × 7.80 mm
SN74AXC8T245RHL VQFN (24)
3.50 mm × 5.50 mm
SN74AXC8T245RJW UQFN (24)
2.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
3 Description
The SN74AXC8T245 device is an 8-bit non-inverting
bus transceiver that resolves voltage level mismatch
between devices operating at the latest voltage
nodes (0.7 V, 0.8 V, and 0.9 V) and devices
operating at industry standard voltage nodes (1.8 V,
2.5 V, 3.3 V) and vice versa.
The device operates by using two independent
power-supply rails (VCCA and VCCB) that operate as
low as 0.65 V. Data pins A1 through A8 are designed
to track VCCA, which accepts any supply voltage from
0.65 V to 3.6 V. Data pins B1 through B8 are
designed to track VCCB, which accepts any supply
voltage from 0.65 V to 3.6 V.
Typical Application Schematic
1.5 V
3.3 V
Processor
Control Block
Data Block
Interrupts
VCCA
A1
A2
A3
A4
A5
A6
A7
A8
DIR1 DIR2
SN74AXC8T245
GND
VCCB
B1
B2
B3
B4
B5
B6
B7
B8
GND
Power Management
Register Map
Sensor Block
1
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.

SN74AXC8T245
SN74AXC8T245
SCES875B – MARCH 2018 – REVISED AUGUST 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 7
6.6 Switching Characteristics, VCCA = 0.7 V ................... 8
6.7 Switching Characteristics, VCCA = 0.8 V ................... 9
6.8 Switching Characteristics, VCCA = 0.9 V ................. 10
6.9 Switching Characteristics, VCCA = 1.2 V ................. 11
6.10 Switching Characteristics, VCCA = 1.5 V ............... 12
6.11 Switching Characteristics, VCCA = 1.8 V ............... 13
6.12 Switching Characteristics, VCCA = 2.5 V ............... 14
6.13 Switching Characteristics, VCCA = 3.3 V ............... 15
6.14 Operating Characteristics: TA = 25°C ................... 16
7 Parameter Measurement Information ................ 18
8 Detailed Description ............................................ 20
8.1 Overview ................................................................. 20
8.2 Functional Block Diagram ....................................... 20
8.3 Feature Description................................................. 21
8.4 Device Functional Modes........................................ 21
9 Application and Implementation ........................ 22
9.1 Application Information............................................ 22
9.2 Typical Application ................................................. 22
10 Power Supply Recommendations ..................... 24
11 Layout................................................................... 24
11.1 Layout Guidelines ................................................. 24
11.2 Layout Example .................................................... 24
12 Device and Documentation Support ................. 25
12.1 Documentation Support ........................................ 25
12.2 Receiving Notification of Documentation Updates 25
12.3 Community Resources.......................................... 25
12.4 Trademarks ........................................................... 25
12.5 Electrostatic Discharge Caution ............................ 25
12.6 Glossary ................................................................ 25
13 Mechanical, Packaging, and Orderable
Information ........................................................... 25
4 Revision History
Changes from Revision A (July 2018) to Revision B
Page
• Changed data sheet status from Mixed Production to Production Data ............................................................................... 1
• Removed package preview note from RJW package ........................................................................................................... 1
Changes from Original (March 2018) to Revision A
Page
• Added RJW as a new package option (preview).................................................................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: SN74AXC8T245
Copyright © 2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity SN74AXC8T245 SCES875B – MARCH 2018 – REVISED AUGUST 2018 SN74AXC8T 245 8-Bit Dual-Supply Bus Transceiver W ith Configurable Voltage Translation an d Tri-State Outputs 1 Features •1 Qu alified Fully Configurable Dual-Rail De sign Allows Each Port to Operate With a Power Supply Range From 0.65 V to 3.6 V • Operating Temperature From –40 C to +125°C • Multiple Direction Co ntrol Pins to Allow Simultaneous Up and Down Translation • Up to 380 Mbps Su pport When Translating from 1.8 V to 3. 3 V • VCC Isolation Feature to Effect ively Isolate Both Buses in a Power-Dow n Scenario • Partial Power-Down Mode to Limit Backflow Current in a Power-Do wn Scenario • Compatible With SN74AVC 8T245 and 74AVC8T245 Level Shifters • Latch-Up Performance Exceeds 100 mA Pe r JESD 78, Class II • ESD Protection Exceeds JESD 22 – 8000-V Human-Body M odel – 1000-V Charged-Device Model 2 Applications • Enterprise and Communications • Industr.
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