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SN74LVC1T45_12

更新时间： 2024-11-27 12:15:03
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德州仪器 - TI 总线收发器
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28页 993K
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SINGLE-BIT DUAL-SUPPLY BUS TRANSCEIVER

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SN74LVC1T45_12 数据手册

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SN74LVC1T45  
www.ti.com ..................................................................................................................................................... SCES515I–DECEMBER 2003–REVISED MAY 2009  
SINGLE-BIT DUAL-SUPPLY BUS TRANSCEIVER  
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS  
1
FEATURES  
2
•
Available in the Texas Instruments NanoFree™  
Package  
•
Max Data Rates  
–
–
–
–
420 Mbps (3.3-V to 5-V Translation)  
210 Mbps (Translate to 3.3 V)  
140 Mbps (Translate to 2.5 V)  
75 Mbps (Translate to 1.8 V)  
•
Fully Configurable Dual-Rail Design Allows  
Each Port to Operate Over the Full 1.65-V to  
5.5-V Power-Supply Range  
•
VCC Isolation Feature – If Either VCC Input Is at  
GND, Both Ports Are in the High-Impedance  
State  
•
•
Latch-Up Performance Exceeds 100 mA Per  
JESD 78, Class II  
ESD Protection Exceeds JESD 22  
•
•
•
•
DIR Input Circuit Referenced to VCCA  
Low Power Consumption, 4-µA Max ICC  
±24-mA Output Drive at 3.3 V  
–
–
–
2000-V Human-Body Model (A114-A)  
200-V Machine Model (A115-A)  
1000-V Charged-Device Model (C101)  
Ioff Supports Partial-Power-Down Mode  
Operation  
DBV PACKAGE  
(TOP VIEW)  
DCK PACKAGE  
(TOP VIEW)  
DRL PACKAGE  
(TOP VIEW)  
YZP PACKAGE  
(BOTTOM VIEW)  
4 C2  
C1  
3
2
A
GND  
VCCA  
B
1
2
3
6
5
4
VCCA  
GND  
A
VCCB VCCA  
VCCB  
DIR  
B
1
2
3
6
5
4
1
2
3
6
VCCA  
GND  
A
VCCB  
DIR  
B
B1  
B2  
5
DIR  
VCCB  
GND  
DIR  
A1 1  
A2  
6
A
5
4
B
See mechanical drawings for dimensions.  
DESCRIPTION/ORDERING INFORMATION  
This single-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 1.65 V to 5.5 V. The B port is designed to track  
VCCB. VCCB 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-V voltage nodes.  
The SN74LVC1T45 is designed for asynchronous communication between two data buses. The logic levels of  
the direction-control (DIR) input activate either the B-port outputs or the A-port outputs. 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 always is active and must have a logic  
HIGH or LOW level applied to prevent excess ICC and ICCZ  
.
The SN74LVC1T45 is designed so that the DIR input is powered 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.  
The VCC isolation feature ensures that if either VCC input is at GND, then both ports are in the high-impedance  
state.  
1
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.  
2
NanoFree is a trademark of Texas Instruments.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2003–2009, Texas Instruments Incorporated  
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