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PDF SP1490E Data sheet ( Hoja de datos )
| Número de pieza | SP1490E | |
| Descripción | Full Duplex RS-485 Transceivers | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP1490E (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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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 IEC61000-4-2 Air Discharge
VCC 1
RO 2
DI 3
GND 4
SP1490E
88 PPiinn-nnSSOOIICC
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 an 8-pin NSOIC packages for operation over the commercial and
industrial temperature ranges. The SP1491E is available in a 14-pin NSOIC packages for operation
over the commercial and industrial temperature ranges.
Vcc 1
RO 2
DI 3
GND 4
R
D
BLOCK DIAGRAM
NC 1
8A
RO 2
7B
RE B 3
6Z
DE 4
R
5Y
DI 5
D
GND 6
GND 7
14 Vcc
13 NC
12 A
11 B
10 Z
9Y
8 NC
SP1490E SP1491E
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP1490_SP1491E_101_052413
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 Exar
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 receiv-
ers 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 accom-
modate 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.
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.
DETAILED DESCRIPTION
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 sensitiv-
ity as low as ±200mV. Input impedance of the
receivers is typically 15KΩ (12KΩ minimum).
A wide common mode range of -7V to +12V
allows for large ground potential differences
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
INPUTS
DE
SP1491E only
DI
11
10
0x
OUTPUTS
YZ
10
01
zz
Transmit Function Truth Table
RE
SP1491E only
A-B
0 +0.2V
0 -0.2V
0 open
1x
Recieve Function Truth Table
R
1
0
1
z
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP1490_SP1491E_101_052413
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SP1490E.PDF ] | |
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