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SN75976A_06

更新时间： 2024-11-10 04:31:15
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德州仪器 - TI /
页数 文件大小 规格书
33页 537K
描述
9-CHANNEL DIFFERENTIAL TRANSCEIVER

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SN75976A_06 数据手册

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SN75976A, SN55976A  
9-CHANNEL DIFFERENTIAL TRANSCEIVER  
SLLS218B – MAY 1995 – REVISED MAY 1997  
SN75976A DGG or DL  
SN55976A WD  
(TOP VIEW)  
Improved Speed and Package Replacement  
for the SN75LBC976  
Designed to Operate at up to 20 Million  
Data Transfers per Second (Fast-20 SCSI)  
GND  
BSR  
CDE2  
CDE1  
CDE0  
9B+  
1
56  
55  
54  
53  
52  
51  
50  
49  
48  
47  
46  
45  
Nine Differential Channels for the Data and  
Control Paths of the Small Computer  
Systems Interface (SCSI) and Intelligent  
Peripheral Interface (IPI)  
2
CRE  
3
1A  
4
1DE/RE  
2A  
9B–  
5
SN75976A Packaged in Shrink  
8B+  
6
Small-Outline Package with 25-Mil Terminal  
Pitch (DL) and Thin Shrink Small-Outline  
Package with 20-Mil Terminal Pitch (DGG)  
2DE/RE  
3A  
8B–  
7
7B+  
8
3DE/RE  
4A  
7B–  
9
SN55976A Packaged in a 56-Pin Ceramic  
Flat Pack (WD)  
6B+  
10  
11  
12  
4DE/RE  
6B–  
V
V
Two Skew Limits Available  
CC  
CC  
GND 13  
GND 14  
44 GND  
43 GND  
ESD Protection on Bus Terminals  
Exceeds 12 kV  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
GND  
GND  
GND  
GND  
GND  
GND  
Low Disabled Supply Current 8 mA Typ  
Thermal Shutdown Protection  
Positive- and Negative-Current Limiting  
Power-Up/Down Glitch Protection  
V
V
CC  
5A  
CC  
5B+  
5B–  
4B+  
4B–  
3B+  
3B–  
2B+  
2B–  
1B+  
1B–  
5DE/RE  
6A  
description  
6DE/RE  
7A  
The SN75976A is an improved replacement for  
the industry’s first 9-channel RS-485  
7DE/RE  
8A  
transceiver — the SN75LBC976. The A version  
offers improved switching performance, a smaller  
package, and higher ESD protection. The  
SN75976A is offered in two versions. The ’976A2  
skew limits of 4 ns for the differential drivers and  
5 ns for the differential receivers complies with the  
recommended skew budget of the Fast-20 SCSI  
standard for data transfer rates up to 20 million  
transfers per second. The ’976A1 supports the  
Fast SCSI skew budget for 10 million  
8DE/RE  
9A  
9DE/RE  
Terminals 13 through 17 and 40 through 44 are  
connected together to the package lead frame  
and signal ground.  
transferspersecond. Theskewlimitensuresthatthepropagationdelaytimes, notonlyfromchannel-to-channel  
but from device-to-device, are closely matched for the tight skew budgets associated with high-speed parallel  
data buses.  
The patented thermal enhancements made to the 56-pin shrink small-outline package (SSOP) of the SN75976  
have been applied to the new, thin shrink, small-outline package (TSSOP). The TSSOP package offers even  
less board area requirements than the SSOP while reducing the package height to 1 mm. This provides more  
board area and allows component mounting to both sides of the printed circuit boards for low-profile,  
space-restricted applications such as small form-factor hard disk drives.  
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 1997, 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...33

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