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型号: 74LVC245
厂商: Texas Instruments Texas Instruments
描述: octal bus transceiver with 3-state outputs
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SN74LVC245A  
OCTAL BUS TRANSCEIVER  
WITH 3-STATE OUTPUTS  
SCAS218I – JANUARY 1993 – REVISED JUNE 1998  
DB, DW, OR PW PACKAGE  
(TOP VIEW)  
EPIC? (Enhanced-Performance Implanted  
CMOS) Submicron Process  
Typical V  
< 0.8 V at V  
(Output Ground Bounce)  
OLP  
1
2
3
4
5
6
7
8
9
10  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
DIR  
A1  
V
CC  
= 3.3 V, T = 25°C  
CC  
A
OE  
B1  
B2  
B3  
B4  
B5  
B6  
B7  
B8  
Typical V  
> 2 V at V  
(Output V  
Undershoot)  
A2  
OHV  
OH  
= 3.3 V, T = 25°C  
CC  
A
A3  
Supports Mixed-Mode Signal Operation on  
All Ports (5-V Input/Output Voltage With  
A4  
A5  
3.3-V V  
)
A6  
CC  
A7  
Power Off Disables Outputs, Permitting  
Live Insertion  
A8  
GND  
ESD Protection Exceeds 2000 V Per  
MIL-STD-883, Method 3015; Exceeds 200 V  
Using Machine Model (C = 200 pF, R = 0)  
Latch-Up Performance Exceeds 250 mA Per  
JESD 17  
Package Options Include Plastic  
Small-Outline (DW), Shrink Small-Outline  
(DB), and Thin Shrink Small-Outline (PW)  
Packages  
description  
This octal bus transceiver is designed for 1.65-V to 3.6-V V  
operation.  
CC  
The SN74LVC245A 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 device so the buses are  
effectively isolated.  
To ensure the high-impedance state during power up or power down, OE should be tied to V through a pullup  
CC  
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.  
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.  
The SN74LVC245A is characterized for operation from –40°C to 85°C.  
FUNCTION TABLE  
INPUTS  
OPERATION  
OE  
L
DIR  
L
B data to A bus  
A data to B bus  
Isolation  
L
H
H
X
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.  
EPIC is a trademark of Texas Instruments Incorporated.  
Copyright ? 1998, Texas Instruments Incorporated  
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.  
1
POST OFFICE BOX 655303 ? DALLAS, TEXAS 75265  
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