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SN74LVCH245AZXYR

更新时间： 2024-11-26 03:07:15
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德州仪器 - TI 总线收发器输出元件
页数 文件大小 规格书
27页 1093K
描述
OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS

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SN74LVCH245AZXYR 数据手册

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SN54LVCH245A, SN74LVCH245A  
OCTAL BUS TRANSCEIVERS  
WITH 3-STATE OUTPUTS  
www.ti.com  
SCES008O–JULY 1995–REVISED DECEMBER 2005  
FEATURES  
•
•
•
•
Operate From 1.65 V to 3.6 V  
Inputs Accept Voltages to 5.5 V  
Max tpd of 6.3 ns at 3.3 V  
•
•
•
•
Ioff Supports Partial-Power-Down Mode  
Operation  
Bus Hold on Data Inputs Eliminates the Need  
for External Pullup/Pulldown Resistors  
Typical VOLP (Output Ground Bounce)  
<0.8 V at VCC = 3.3 V, TA = 25°C  
Latch-Up Performance Exceeds 250 mA Per  
JESD 17  
•
•
Typical VOHV (Output VOH Undershoot)  
>2 V at VCC = 3.3 V, TA = 25°C  
ESD Protection Exceeds JESD 22  
– 2000-V Human-Body Model (A114-A)  
– 200-V Machine Model (A115-A)  
Support Mixed-Mode Signal Operation on All  
Ports (5-V Input/Output Voltage With  
3.3-V VCC  
)
SN54LVCH245A . . . J OR W PACKAGE  
SN74LVCH245A . . . DB, DGV, DW, NS,  
OR PW PACKAGE  
SN74LVCH245A . . . RGY PACKAGE  
(TOP VIEW)  
SN54LVCH245A . . . FK PACKAGE  
(TOP VIEW)  
(TOP VIEW)  
1
20  
1
2
3
4
5
6
7
8
9
10  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
DIR  
A1  
A2  
A3  
A4  
V
CC  
3
2
1
20 19  
18  
B1  
B2  
B3  
B4  
B5  
A3  
A4  
A5  
A6  
A7  
4
5
6
7
8
2
3
4
5
6
7
8
9
19  
18  
17  
16  
15  
14  
13  
12  
A1  
A2  
A3  
A4  
A5  
A6  
A7  
A8  
OE  
B1  
B2  
B3  
B4  
B5  
B6  
B7  
OE  
B1  
B2  
B3  
B4  
B5  
B6  
B7  
B8  
17  
16  
15  
14  
A5  
A6  
A7  
A8  
9
10 11 12 13  
10  
11  
GND  
DESCRIPTION/ORDERING INFORMATION  
The SN54LVCH245A octal bus transceiver is designed for 2.7-V to 3.6-V VCC operation, and the  
SN74LVCH245A octal bus transceiver is designed for 1.65-V to 3.6-V VCC operation.  
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators  
in a mixed 3.3-V/5-V system environment.  
These devices are designed for asynchronous communication between data buses. These devices transmit 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 device so the buses are effectively isolated.  
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the  
outputs, preventing damaging current backflow through the devices when they are powered down.  
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup  
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.  
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or  
pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input  
circuit and is not disabled by OE or DIR.  
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.  
Copyright © 1995–2005, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
On products compliant to MIL-PRF-38535, all parameters are  
Instruments standard warranty. Production processing does not  
tested unless otherwise noted. On all other products, production  
necessarily include testing of all parameters.  
processing does not necessarily include testing of all parameters.  
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SN74LVCH245AZXYR 替代型号

型号 品牌 替代类型 描述 数据表
SN74LVCH245AZQNR TI

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 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SN74LVC245AZQNR TI

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SN74LVC245AGQNR TI

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 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS

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