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SN75970B

更新时间： 2024-11-07 22:53:35
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德州仪器 - TI /
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23页 332K
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SCSI DIFFERENTIAL CONVERTER-CONTROL

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SN75970B 数据手册

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SN75970B  
SCSI DIFFERENTIAL CONVERTER-CONTROL  
SLLS323A – NOVEMBER 1999 – REVISED JANUARY 2000  
DGG OR DL PACKAGE  
(TOP VIEW)  
Provides High-Voltage Differential SCSI  
from Single-Ended Controller When Used  
With the SN75971B Data Transceiver  
RSTFLTR  
RESET  
DSENS  
CLK40  
GND  
X2  
1
56  
55  
54  
53  
52  
51  
50  
49  
48  
47  
46  
45  
Nine Transceivers Meet or Exceed the  
Requirements of ANSI Standard EIA-485  
and ISO-8482 Standards  
X1/CLK20  
NC  
2
3
BATN–  
BATN+  
BACK–  
BACK+  
BREQ–  
BREQ+  
BC/D–  
BC/D+  
4
ESD Protection on Bus Pins to 12 kV  
5
Packaged in Shrink Small-Outline Package  
with 25 mil Terminal Pitch and Thin  
Small-Package with 20 mil Terminal Pitch  
AATN–  
TEST  
6
7
AACK–  
TIMEOUT  
AREQ–  
AC/D–  
8
Low Disabled Supply Current 32 mA Typ  
Thermal Shutdown Protection  
9
10  
11  
12  
Positive- and Negative-Current Limiting  
Power-Up/-Down Glitch Protection  
Open-Circuit Failsafe Receivers  
V
V
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 SN75970B SCSI differential converter-  
control, when used in conjunction with one or  
more of its companion data transceiver(s),  
provides the superior electrical performance of  
differential SCSI from a single-ended 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) as well as  
the even smaller TSSOP 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  
The SN75970B is available in a B2 (20 Mxfer)  
version and a B1 (10 Mxfer) version.  
NC – No internal connection  
Terminals 13 through 17 and 40 through 44 are  
connected together to the package lead frame and  
signal ground.  
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 controller to  
only an 8-bit differential bus. Using the standard nine SCSI control signals, the SN75970B control transceiver  
decodes the state of the bus and enables the SN75971B 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 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...23

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