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SN75LBC970A PDF预览

SN75LBC970A

更新时间： 2024-09-15 22:27:23
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德州仪器 - TI /
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20页 310K
描述
SCSI DIFFERENTIAL CONVERTER-CONTROL

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SN75LBC970A 数据手册

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SN75LBC970A  
SCSI DIFFERENTIAL CONVERTER-CONTROL  
SLLS215B – MAY 1995 – REVISED JANUARY 1999  
DL PACKAGE  
(TOP VIEW)  
Provides Differential SCSI from Single-  
Ended Controller When Used With the  
SN75LBC971A Data Transceiver  
RSTFLTR  
RESET  
DSENS  
CLK40  
GND  
X2  
1
56  
55  
54  
53  
52  
51  
50  
49  
48  
47  
46  
45  
Designed to Operate at Fast-SCSI Speeds  
of 10 Million Data Transfers per Second  
X1/CLK20  
NC  
2
3
Nine Transceivers Meet or Exceed the  
Requirements of ANSI Standard EIA-485  
and ISO-8482 Standards  
BATN–  
BATN+  
BACK–  
BACK+  
BREQ–  
BREQ+  
BC/D–  
BC/D+  
4
5
AATN–  
TEST  
6
Packaged in Shrink Small-Outline Package  
with 25 mil Terminal Pitch  
7
AACK–  
TIMEOUT  
AREQ–  
AC/D–  
8
Low Disabled Supply Current  
22 mA Typ  
9
10  
11  
12  
Thermal Shutdown Protection  
V
V
Positive- and Negative-Current Limiting  
Power-Up/-Down Glitch Protection  
CC  
CC  
GND 13  
GND 14  
44 GND  
43 GND  
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  
description  
The SN75LBC970A SCSI differential converter-  
control is an adaptation of the industry’s first  
9-channel RS-485 transceiver, the SN75LBC976.  
When used in conjunction with one or more of its  
companion data transceiver(s), SN75LBC971A,  
the chip set provides the superior electrical  
performance of differential SCSI from a single-en-  
ded SCSI bus controller. A 16-bit, Fast-SCSI bus  
can be implemented with just three devices (two  
for data and one for control) in the space-efficient,  
56-pin, shrink small-outline package (SSOP) and  
a few external components.  
V
V
CC  
CC  
DRVBUS  
SDB  
BMSG–  
BMSG+  
BI/O–  
AMSG–  
AI/O–  
ASEL–  
NC  
BI/O+  
BSEL+  
BSEL–  
BBSY+  
BBSY–  
BRST+  
BRST–  
ABSY–  
NC  
ARST–  
NC  
In a typical differential SCSI node, the SCSI  
controller provides the enables for each external  
RS-485 transceiver. This could require as many  
as 27 additional terminals for a 16-bit differential  
bus controller or relegate a 16-bit single-ended  
NC – no internal connection  
Terminals 13 through 17 and 40 through 44 are  
connected together to the package lead frame and  
signal ground.  
controller to only an 8-bit differential bus. Using the standard nine SCSI control signals, the SN75LBC970A  
control transceiver decodes the state of the bus and enables the SN75LBC971A data transceiver(s) to transmit  
the single-ended SCSI input signals differentially to the cable or receive the differential cable signals and drive  
the single-ended outputs to the controller.  
The single-ended SCSI bus interface consists of CMOS bidirectional inputs and outputs. The drivers are rated  
at ±16 mA of output current. The receiver inputs are pulled high with approximately 4 mA to eliminate the need  
for external pullup resistors for the open-drain outputs of most single-ended SCSI controllers. The single-ended  
side of the device is not intended to drive the SCSI bus directly.  
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  
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...20

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