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SN74LVC16646DLR

更新时间： 2024-11-27 13:13:51
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德州仪器 - TI 总线收发器输出元件
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SN74LVC16646DLR 数据手册

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SN74LVC16646  
16-BIT BUS TRANSCEIVER AND REGISTER  
WITH 3-STATE OUTPUTS  
SCAS318B – NOVEMBER 1993 – REVISED JULY 1995  
DGG OR DL PACKAGE  
(TOP VIEW)  
Member of the Texas Instruments  
Widebus Family  
EPIC (Enhanced-Performance Implanted  
CMOS) Submicron Process  
1
56  
55  
54  
53  
52  
51  
50  
49  
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
1DIR  
1CLKAB  
1SAB  
GND  
1OE  
2
1CLKBA  
1SBA  
GND  
1B1  
Typical V  
< 0.8 V at V  
(Output Ground Bounce)  
OLP  
3
= 3.3 V, T = 25°C  
CC  
A
4
Typical V  
> 2 V at V  
(Output V  
Undershoot)  
5
1A1  
1A2  
OHV  
CC  
OH  
= 3.3 V, T = 25°C  
6
A
1B2  
7
Latch-Up Performance Exceeds 250 mA  
Per JEDEC Standard JESD-17  
V
V
CC  
CC  
8
1A3  
1A4  
1A5  
GND  
1A6  
1A7  
1A8  
2A1  
2A2  
2A3  
GND  
2A4  
2A5  
2A6  
1B3  
1B4  
1B5  
GND  
1B6  
1B7  
1B8  
2B1  
2B2  
2B3  
GND  
2B4  
2B5  
2B6  
9
Bus Hold on Data Inputs Eliminates the  
Need for External Pullup/Pulldown  
Resistors  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
Package Options Include Plastic 300-mil  
Shrink Small-Outline (DL) and Thin Shrink  
Small-Outline (DGG) Packages  
description  
This 16-bit bus transceiver and register is  
designed for low-voltage (3.3-V) V operation.  
CC  
The SN74LVC16646 can be used as two 8-bit  
transceivers or one 16-bit transceiver. The device  
consists of bus transceiver circuits, D-type  
flip-flops, and control circuitry arranged for  
multiplexed transmission of data directly from the  
input bus or from the internal registers.  
V
V
CC  
CC  
2A7  
2A8  
GND  
2B7  
2B8  
GND  
2SBA  
2CLKBA  
2OE  
2SAB  
2CLKAB  
2DIR  
Data on the A or B bus is clocked into the registers  
on the low-to-high transition of the appropriate  
clock (CLKAB or CLKBA) input. Figure 1  
illustrates the four fundamental bus-management  
functions that can be performed with the  
SN74LVC16646.  
Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver  
mode, data present at the high-impedance port may be stored in either register or in both. The select-control  
(SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data. The circuitry used for select  
control eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored  
and real-time data. DIR determines which bus receives data when OE is low. In the isolation mode (OE high),  
A data may be stored in one register and/or B data may be stored in the other register.  
When an output function is disabled, the input function is still enabled and can be used to store and transmit  
data. Only one of the two buses, A or B, may be driven at a time.  
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.  
Active bus-hold circuitry holds unused or floating data inputs at a valid logic level.  
The SN74LVC16646 is characterized for operation from –40°C to 85°C.  
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 and Widebus are trademarks of Texas Instruments Incorporated.  
Copyright 1995, 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  
1234567...9

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