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SN74CBT16800CDGG PDF预览

SN74CBT16800CDGG

更新时间： 2024-02-27 18:44:21
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德州仪器 - TI 开关输出元件
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SN74CBT16800  
20-BIT FET BUS SWITCH  
WITH PRECHARGED OUTPUTS  
SCDS090 – MAY 1999  
DGG OR DGV PACKAGE  
(TOP VIEW)  
5-Ω Switch Connection Between Two Ports  
TTL-Compatible Input Levels  
B-Port Outputs Are Precharged by Bias  
Voltage to Minimize Signal Distortion  
During Live Insertion  
BIASV  
1A1  
1A2  
1A3  
1A4  
1A5  
1A6  
GND  
1A7  
1A8  
1A9  
1A10  
2A1  
1OE  
2OE  
1B1  
1B2  
1B3  
1B4  
1B5  
GND  
1B6  
1B7  
1B8  
1B9  
1B10  
1
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
2
3
Package Options Include Plastic Thin  
Shrink Small-Outline (DGG) and Thin Very  
Small-Outline (DGV) Packages  
4
5
6
7
description  
8
9
The SN74CBT16800 provides 20 bits of  
high-speed TTL-compatible bus switching. The  
low on-state resistance of the switch allows  
connections to be made with minimal propagation  
delay. The device also precharges the B port to a  
user-selectable bias voltage (BIASV) to minimize  
live-insertion noise.  
10  
11  
12  
13  
35 2B1  
34 2B2  
33 2B3  
2A2 14  
15  
2A3 16  
V
CC  
The device is organized as dual 10-bit bus  
switches with separate output-enable (OE)  
inputs. It can be used as two 10-bit bus switches  
or one 20-bit bus switch. When OE is low, the  
associated 10-bit bus switch is on and port A is  
connected to port B. When OE is high, the switch  
is open, the high-impedance state exists between  
the two ports, and port B is precharged to BIASV  
through the equivalent of a 10-kΩ resistor.  
17  
18  
19  
20  
21  
22  
23  
24  
32  
31  
30  
29  
28  
27  
26  
25  
GND  
2A4  
2A5  
2A6  
2A7  
2A8  
2A9  
2A10  
GND  
2B4  
2B5  
2B6  
2B7  
2B8  
2B9  
2B10  
To ensure the high-impedance state during power  
up or power down, OE should be tied to V  
CC  
through a pullup resistor; the minimum value of  
the resistor is determined by the current-sinking  
capability of the driver.  
The SN74CBT16800 is characterized for  
operation from –40°C to 85°C.  
FUNCTION TABLE  
(each 10-bit bus switch)  
INPUT  
FUNCTION  
OE  
L
A port = B port  
A port = Z  
B port = BIASV  
H
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.  
Copyright 1999, Texas Instruments Incorporated  
PRODUCT PREVIEW information concerns products in the formative or  
design phase of development. Characteristic data and other  
specifications are design goals. Texas Instruments reserves the right to  
change or discontinue these products without notice.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
12345

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