DS3885 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – BTL Arbitration Transceiver

January 1994
DS3885 BTL Arbitration Transceiver
General Description
The DS3885 is one in a series of transceivers designed spe-
cifically for the implementation of high performance Future-
busa and proprietary bus interfaces The DS3885 Arbitra-
tion Transceiver is designed to conform to IEEE 1194 1
(Backplane Transceiver Logic BTL) as specified in the
IEEE 896 2 Futurebusa specification The Arbitration
Transceiver incorporates the competition logic internally
which simplifies the implementation of a Futurebusa appli-
cation by minimizing the on board logic required
The DS3885 driver output configuration is an NPN open col-
lector which allows Wired-OR connection on the bus Each
driver output incorporates a Schottky diode in series with its
collector to isolate the transistor output capacitance from
the bus thus reducing the bus loading in the inactive state
The BTL drivers also have high sink current capability to
comply with the bus loading requirements defined within
IEEE 1194 1 BTL specification
Backplane Transceiver Logic (BTL) is a signaling standard
that was invented and first introduced by National Semicon-
(Continued)
Features
Y _{9-bit inverting BTL transceiver}
Y _{Meets IEEE 1194 1 standard on Backplane Transceiver}
Logic (BTL)
Y _{Includes on chip competition logic and parity checking}
Y _{Supports live insertion}
Y _{Glitch free power-up down protection}
Y _{Typically less than 5 pF bus-port capacitance}
Y _{Low bus-port voltage swing (typically 1V) at 80 mA}
Y _{Open collector bus-port output allows Wired-OR}
connection
Y _{Exceeds 2 kV ESD testing (Human Body Model)}
Y _{Individual bus-port ground pins minimize ground bounce}
Y _{Controlled rise and fall time to reduce noise coupling to}
adjacent lines
Y _{TTL compatible driver and control inputs}
Y _{Built in bandgap reference with separate QVCC and}
QGND pins for precise receiver thresholds
Y _{Product offered in PLCC and PQFP package styles}
Connection Diagrams
TL F 10721 – 2
Order Number DS3885V or DS3885VF
See NS Package Number V44A or VF44B
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 10721
TL F 10721 – 13
RRD-B30M75 Printed in U S A