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PDF DS1776 Data sheet ( Hoja de datos )
| Número de pieza | DS1776 | |
| Descripción | PI-Bus Transceiver | |
| Fabricantes | National | |
| Logotipo |  |
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January 1996
DS1776
PI-Bus Transceiver
General Description
The DS1776 is an octal PI-bus Transceiver. The A to B path
is latched. B outputs are open collector with series Schottky
diode, ensuring minimum B output loading. B outputs also
have ramped rise and fall times (2.5 ns typical), ensuring
minimum PI-bus ringing. B inputs have glitch rejection cir-
cuitry, 4 ns typical.
Designed using National’s Bi-CMOS process for both low
operating and disabled power. AC performance is optimized
for the PI-Bus inter-operability requirements.
The DS1776 is an octal latched transceiver and is intended
to provide the electrical interface to a high performance
wired-or bus. This bus has a loaded characteristic imped-
ance range of 20Ω to 50Ω and is terminated on each end
with a 30Ω to 40Ω resistor.
The DS1776 is an octal bidirectional transceiver with open
collector B and TRI-STATE® A port output drivers. A latch
function is provided for the A port signals. The B port output
driver is designed to sink 100 mA from 2V and features a
controlled linear ramp to minimize crosstalk and ringing on
the bus.
A separate high level control voltage (VX) is provided to pre-
vent the A side output high level from exceeding future high
density processor supply voltage levels. For 5V systems, VX
is tied to VCC.
Features
n Mil-Std-883C qualified
n Similar to BTL
n Low power ICCL = 41 mA max
n B output controlled ramp rate
n B input noise immunity, typically 4 ns
n Available in 28-pin DIP, Flatpak and CLCC
n Pin and function compatible with Signetics 54F776
Pin Configurations
Pin Configuration
Pin Configuration
DS010875-1
Order Number DS1776E/883 or DS1776J/883
See NS Package E28A or J28B
Logic Symbol
DS010875-2
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS010875
DS010875-3
www.national.com
1 page  
Description (Continued)
TABLE 1. Pin Description (Continued)
Symbol
B0
B1
B2
B3
B4
B5
B6
B7
OEB 0
OEB 1
OEA
LE
VX
Pins
27
26
24
23
21
20
19
17
15
16
2
28
14
Type
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I
I
I
I
Name and Function
Data input with special threshold circuitry to reject noise/Open Collector output,
High current drive
Enables the B outputs when both pins are low
Enables the A outputs when High
Latched when High (a special delay feature is built in for proper enabling
times)
Clamping voltage keeping VOH from rising above VX (VX = VCC for normal
use)
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
28-Lead Ceramic Flatpak (F)
Order Number DS1776W/883
NS Package Number WA28D
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: [email protected]
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 1 80-530 85 85
English Tel: +49 (0) 1 80-532 78 32
Français Tel: +49 (0) 1 80-532 93 58
Italiano Tel: +49 (0) 1 80-534 16 80
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: [email protected]
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet DS1776.PDF ] | |
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