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DS1487M Datasheet

  • DS1487M

  • Low Power RS-485 1⁄4 Unit Load Multipoint Transceiver

  • 141.06KB

  • 8頁

  • NSC

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DS1487 Low Power RS-485
1
鈦?/div>
4
Unit Load Multipoint Transceiver
July 1998
DS1487
Low Power RS-485
1
鈦?/div>
4
Unit Load Multipoint Transceiver
General Description
The DS1487 is a low-power transceiver for RS-485 and
RS-422 communication. The device contains one driver and
one receiver. The drivers slew rate allows for operation up to
2.0 Mbps (see Applications Information section). The trans-
ceiver presents
1
鈦?/div>
4
unit loading to the RS-485 bus allowing up
to 128 nodes to be connected together without the use of re-
peaters.
The transceiver draws 200 碌A(chǔ) of supply current when un-
loaded or fully loaded with the driver disabled and operates
from a single +5V supply.
The driver is short-circuit current limited and is protected
against excessive power dissipation by thermal shutdown
circuitry that places the driver outputs into TRI-STATE
廬
(High Impedance state) under fault conditions. The driver
guarantees a minimum of 1.5V differential output voltage
with maximum loading across the common mode range
(V
OD3
).
The receiver has a failsafe feature that guarantees a
logic-high output if the input is open circuit.
The DS1487 is available in surface mount and DIP pack-
ages.
Features
n
n
n
n
n
n
n
Meets TIA/EIA RS-485 multipoint standard
Allows up to 128 transceivers on the bus (
1
鈦?/div>
4
U.L.)
Guaranteed full load output voltage (V
OD3
)
Low quiescent current: 200 碌A(chǔ) typ
鈭?V to +12V common-mode input voltage range
TRI-STATE outputs on driver and receiver
AC performance:
鈥?Driver transition time: 25 ns typ
鈥?Driver propagation delay: 40 ns typ
鈥?Driver skew: 1 ns typ
鈥?Receiver propagation delay: 200 ns typ
鈥?Receiver skew: 20 ns typ
Half-duplex flow through pinout
Operates from a single 5V supply
Current-limiting and thermal shutdown for driver
overload protection
Pin and functional compatible with MAX1487
n
n
n
n
Connection and Logic Diagram
DIP and SOIC
Truth Table
DRIVER SECTION
RE
(Note 1)
X
X
X
RE
(Note 1)
L
L
DE
H
H
L
DE
L
L
X
L
DI
H
L
X
A-B
鈮?0.2V
鈮も垝0.2V
X
OPEN (Note 1)
A
H
L
Z
B
L
H
Z
RO
H
L
Z
H
RECEIVER SECTION
DS012920-1
*Note: Non Terminated, Open Input only
Order Number
DS1487N
DS1487M
Temp. Range
0藲C to +70藲C
0藲C to +70藲C
Package/###
DIP/N08E
SOP/M08A
H
L
X = indeterminate
Z = TRI-STATE
Note 1:
Non Terminated, Open Input only
TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS012920
www.national.com

DS1487M 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Tube

  • 95

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