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PDF SP1490E Data sheet ( Hoja de datos )
| Número de pieza | SP1490E | |
| Descripción | Full Duplex RS-485 Transceivers | |
| Fabricantes | Sipex | |
| Logotipo |  |
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® Preliminary SP1490E/SP1491E
Full Duplex RS-485 Transceivers
FEATURES
■ +5V Only
■ Low Power BiCMOS
■ Driver/Receiver Enable (SP1491E)
■ RS-485 and RS-422 Drivers/Receivers
■ Pin Compatible with SN75179
(SP1490E)
■ Pin Compatible with SN75180
(SP1491E)
■ Improved ESD Specifications
±15kV Human Body Model
±15kV IEC1000-4-2 Air Discharge
±8kV IEC1000-4-2 Contact Discharge
VCC 1
RO 2
DI 3
GND 4
SP1490E
8 Pin - nSOIC
8A
7B
6Z
5Y
APPLICATIONS
■ Industial Networks ■ Telecom
■ Motor Control
■ HVAC/ Building Control
DESCRIPTION
The SP1490E is a low power differential line driver/receiver meeting RS-485 and RS-422
standards up to 20Mbps. The SP1491E is identical to the SP1490E with the addition of driver
and receiver tri-state enable lines. Both products feature ±200mV receiver input sensitivity,
over wide common mode range. The SP1490E is available in 8-pin plastic DIP and 8-pin
NSOIC packages for operation over the commercial and industrial temperature ranges. The
SP1491E is available in 14-pin DIP and 14-pin NSOIC packages for operation over the
commercial and industrial temperature ranges.
BLOCK DIAGRAM
Vcc 1
RO 2
DI 3
GND 4
R
D
NC 1
8A
RO 2
7B
REB 3
6Z
DE 4
5Y
DI 5
GND 6
GND 7
R
D
14 Vcc
13 NC
12 A
11 B
10 Z
9Y
8 NC
SP1490E
SP1491E
Date: 5/18/04
SP1490E/1491E Full Duplex RS-485 Transceivers
1
© Copyright 2004 Sipex Corporation
1 page  
The SP1490E and SP1491E are full-duplex dif-
ferential transceivers that meet the requirements
of RS-485 and RS-422. Fabricated with a Sipex
proprietary BiCMOS process, both products
require a fraction of the power of older bipolar
designs.
The RS-485 standard is ideal for multi-drop
applications or for long-distance interfaces.
RS-485 allows up to 32 drivers and 32 receivers
to be connected to a data bus, making it an ideal
choice for multi-drop applications. Since the
cabling can be as long as 4,000 feet, RS-485
transceivers are equipped with a wide (-7V to
+12V) common mode range to accommodate
ground potential differences. Because RS-485
is a differential interface, data is virtually
immune to noise in the transmission line.
Driver...
The drivers for both the SP1490E and SP1491E
have differential outputs. The typical voltage
output swing with no load will be 0 volts to +5
volts. With worst case loading of 54Ω across the
differential outputs, the driver can maintain
greater than 1.5V voltage levels.
INPUTS
OUTPUTS
DETAILED DESCRIPTION
The driver of the SP1491E has a driver enable
control line which is active high. A logic high
on DE (pin 4) of the SP1491E will enable
the differential driver outputs. A logic low
on DE (pin 4) of the SP1491E will tri-state the
driver outputs. The SP1490E does not have a
driver enable.
Receiver...
The receivers for both the SP1490E and
SP1491E have differential inputs with an input
sensitivity as low as ±200mV. Input impedance
of the receivers is typically 15KΩ (12KΩ mini-
mum). A wide common mode range of -7V to
+12V allows for large ground potential differ-
ences between systems. The receivers for both
the SP1490E and SP1491E are equipped with
the fail-safe feature. Fail-safe guarantees that
the receiver output will be in a high state when
the input is left unconnected and floating.
The receiver of the SP1491E has a receiver
enable control line which is active low. A logic
low on REB (pin 3) of the SP1491E will enable
the differential receiver. A logic high on REB
(pin 3) of the SP1491E will tri-state the re-
ceiver.
INPUTS
OUTPUTS
DE
SP1491E only
DI
11
10
0x
Y
1
0
z
Z
0
1
z
Transmit Function Truth Table
RE A-B
SP1491E only
0 +0.2V
0 -0.2V
0 open
1x
Recieve Function Truth Table
R
1
0
1
z
Date: 5/18/04
SP1490E/1491E Full Duplex RS-485 Transceivers
5
© Copyright 2004 Sipex Corporation
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SP1490E.PDF ] | |
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