SN75LBC978 Datasheet


Part Number

SN75LBC978

Description

9-Channel DIFFERENTIAL TRANSCEIVER

Manufacture

etcTI

Total Page 19 Pages
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Download SN75LBC978 Datasheet


Features Datasheet pdf SN75LBC978 9ĆCHANNEL DIFFERENTIAL TRANS CEIVER SLLS134F − APRIL 1992 − REV ISED APRIL 2005 D Nine Differential Ch annels for the Data and Control Paths o f the Differential Small Computer Syste ms Interface (SCSI) D Meets or Exceeds the Requirements of ANSI Standard RS-48 5 and ISO 8482:1987(E) D Packaged in Sh rink Small-Outline Package With 25-mil Terminal Pitch D Designed to Operate at 10 Million Transfers Per Second D Low Disabled Supply Current 1.4 mA Typ D Th ermal Shutdown Protection D Power-Up/Po wer-Down Glitch Protection D Positive a nd Negative Output-Current Limiting D O pen-Circuit Fail-Safe Receiver Design d escription The SN75LBC978 is a nine-cha nnel differential transceiver based on the 75LBC176 LinASIC cell. Use of TI ’s LinBiCMOS† process technology allows the power reduction necessary t o integrate nine differential balanced transceivers†. On-chip enabling logic makes this device applicable for the d ata path (eight data bits plus parity) and the control path (nine bits) for th.
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SN75LBC978 Datasheet
SN75LBC978
9ĆCHANNEL DIFFERENTIAL TRANSCEIVER
SLLS134F − APRIL 1992 − REVISED APRIL 2005
D Nine Differential Channels for the Data and
Control Paths of the Differential Small
Computer Systems Interface (SCSI)
D Meets or Exceeds the Requirements of
ANSI Standard RS-485 and ISO
8482:1987(E)
D Packaged in Shrink Small-Outline Package
With 25-mil Terminal Pitch
D Designed to Operate at 10 Million Transfers
Per Second
D Low Disabled Supply Current
1.4 mA Typ
D Thermal Shutdown Protection
D Power-Up/Power-Down Glitch Protection
D Positive and Negative Output-Current
Limiting
D Open-Circuit Fail-Safe Receiver Design
description
The SN75LBC978 is a nine-channel differential
transceiver based on the 75LBC176 LinASIC
cell. Use of TI’s LinBiCMOSprocess technolo-
gy allows the power reduction necessary to
integrate nine differential balanced transceivers.
On-chip enabling logic makes this device
applicable for the data path (eight data bits plus
parity) and the control path (nine bits) for the Small
Computer Systems Interface (SCSI) standard.
The WRAP function allows in-circuit testing and
wired-OR channels for the BSY, RST, and SEL
signals of the SCSI bus.
The SN75LBC978 is packaged in a shrink
small-outline package (DL) with improved thermal
characteristics using heat-sink terminals. This
package is ideal for low-profile, space-restricted
applications such as hard disk drives.
DL PACKAGE
(TOP VIEW)
NC
WRAP2
WRAP1
1A
1DE/RE
2A
2DE/RE
3A
3DE/RE
4A
4DE/RE
VCC
GND
GND
GND
GND
GND
VCC
5A
5DE/RE
6A
6DE/RE
7A
7DE/RE
8A
8DE/RE
9A
9DE/RE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56 NC
55 NC
54 CE
53 9B +
52 9B −
51 8B +
50 8B −
49 7B +
48 7B −
47 6B +
46 6B −
45 VCC
44 GND
43 GND
42 GND
41 GND
40 GND
39 VCC
38 5B +
37 5B −
36 4B +
35 4B −
34 3B +
33 3B −
32 2B +
31 2B −
30 1B +
29 1B −
Pins 13 through 17 and 40 through 44 are
connected together to the package lead
frame and signal ground.
The switching speed of the SN75LBC978 is sufficient to transfer data over the data bus at 10 million transfers
per second. Each of the nine identical channels conforms to the requirements of the ANSI RS-485 and
ISO 8482:1987(E) standards referenced by ANSI X3.131-1993 (SCSI-2) and the proposed SCSI-3 standards.
The SN75LBC978 is characterized for operation from 0°C to 70°C.
Patent Pending
LinASIC and LinBiCMOS are trademarks of 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.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 1997, Texas Instruments Incorporated
1




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