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SN75971B PDF预览

SN75971B

更新时间： 2024-09-19 22:53:35
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德州仪器 - TI /
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15页 210K
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SCSI DIFFERENTIAL CONVERTER-DATA

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SN75971B 数据手册

 浏览型号SN75971B的Datasheet PDF文件第2页浏览型号SN75971B的Datasheet PDF文件第3页浏览型号SN75971B的Datasheet PDF文件第4页浏览型号SN75971B的Datasheet PDF文件第5页浏览型号SN75971B的Datasheet PDF文件第6页浏览型号SN75971B的Datasheet PDF文件第7页 
SN75971B  
SCSI DIFFERENTIAL CONVERTER-DATA  
SLLS322A – NOVEMBER 1999 – REVISED JANUARY 2000  
Provides High-Voltage Differential SCSI  
From Single-Ended Controller When Used  
With the SN75970B Control Transceiver  
DGG OR DL PACKAGE  
(TOP VIEW)  
SDB  
DRVBUS  
GND  
ADBP–  
NC  
ADB7–  
NC  
ADB6–  
NC  
DSENS  
RESET  
GND  
1
56  
55  
54  
53  
52  
51  
50  
49  
48  
47  
46  
45  
44  
43  
Meets or Exceeds the Requirements of EIA  
Standard RS-485 and ISO-8482 Standards  
2
3
ESD Protection on Bus Pins to 12 kV  
BDBP–  
BDBP+  
BDB7–  
BDB7+  
BDB6–  
BDB6+  
BDB5–  
BDB5+  
4
Packaged in Shrink Small-Outline Package  
with 25 mil Terminal Pitch and Thin  
Small-Package with 20 mil Terminal Pitch  
5
6
7
Low Disabled-Supply Current 32 mA Typ  
Thermal Shutdown Protection  
8
9
ADB5–  
NC  
10  
11  
12  
13  
14  
Positive- and Negative-Current Limiting  
Power-Up/-Down Glitch Protection  
Open-Circuit Failsafe Receivers  
V
V
CC  
CC  
GND  
GND  
GND  
GND  
description  
GND 15  
42 GND  
GND  
GND  
GND  
GND  
16  
17  
18  
41  
40  
39  
The SN75971B SCSI differential converter-data is a  
9-channel RS-485 transceiver. When used in conjunc-  
tion with its companion control transceiver, the  
SN75970B, the resulting chip set provides the superior  
electrical performance of differential SCSI from a  
single-ended SCSI bus or controller. A 16-bit  
Ultra-SCSI (or Fast-20) SCSI bus can be implemented  
with just three devices (two data and one control) in the  
space efficient, 56-pin, shrink small-outline package  
(SSOP) or thin shink small outline package (TSSOP)  
and a few external components. An 8-bit SCSI bus  
requires only one data and one control transceiver.  
V
V
CC  
CC  
ABD4– 19  
NC 20  
38 BDB4–  
37 BDB4+  
36 BDB3–  
35 BDB3+  
34 BDB2–  
33 BDB2+  
32 BDB1–  
31 BDB1+  
30 BDB0–  
29 BDB0+  
ADB3– 21  
NC 22  
ADB2– 23  
NC 24  
ADB1– 25  
NC 26  
ADB0– 27  
NC 28  
The SN75971B is available in a B2 (20 Mxfer)  
version and a B1 (10 Mxfer) version.  
Pins13–17and40–44areconnected  
togethertothepackageleadframeand  
to signal ground.  
In a typical differential SCSI node, the SCSI controller  
provides an enable for each external RS-485  
transceiver channel. This could require as many as 27  
NC – No internal connection  
extra terminals for a 16-bit differential bus controller or relegate a 16-bit, single-ended controller to only an 8-bit  
differential bus. Using the standard nine SCSIcontrol signals, the SN75970B control transceiver decodes the  
state of the bus and enables the SN75971B data transceiver to transmit the single-ended SCSI input signals  
(A side) differentially to the cable or receive the differential cable signals (B side) and drive the single-ended  
outputs to the controller.  
A reset function, which disables all outputs and clears internal latches, can be accomplished from two external  
inputs and two internally-generated signals. RESET (reset) and DSENS (differential sense) are available to  
external circuits for a bus reset or to disable all outputs should a single-ended cable be inadvertently connected  
to a differential connector. Internally-generated power-up and thermal-shutdown signals have the same affect  
when the supply voltage is below approximately 3.5 V or the junction temperature exceeds 175°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.  
Copyright 2000, 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...15

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