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PDF SP3487 Data sheet ( Hoja de datos )
| Número de pieza | SP3487 | |
| Descripción | +3.3V Low Power Quad RS-485/RS-422 Line Drivers | |
| Fabricantes | Sipex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP3487 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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® SP3486 and SP3487
+3.3V Low Power Quad
RS-485/RS-422 Line Drivers
■ RS-485 or RS-422 Quad Differential
Line Drivers
■ Operates from a single +3.3V supply
■ Interoperable with +5.0V logic
■ Tri-state Output Control
■ -7V to +12V Common-Mode Input
Voltage Range
■ Common Driver Enable Control (SP3486)
■ Independent Driver Enable Controls for
each pair of Drivers (SP3487)
■ Compatibility with LTC486
and SN75172 (SP3486)
■ Compatibility with LTC487
and SN75174 (SP3487)
DESCRIPTION
The SP3486 and the SP3487 are +3.3V low power quad drivers that meet the specifications
of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin compatible with
Sipex's SP486 and SP487 devices as well as popular industry standards. The SP3486 and
SP3487 feature Sipex's BiCMOS process allowing low power operation without sacrificing
performance. The SP3486 and SP3487 meet the electrical specifications of RS-485 and
RS-422 serial protocols up to 10Mbps under load. The SP3486 features a common driver
enable control. The SP3487 provides independent driver enable controls for each pair of
drivers. Both devices feature tri-state outputs and a -7V to +12V common-mode input voltage
range.
DI1 1
DO1A 2
DO1B 3
EN 4
DO2B 5
DO2A 6
DI2 7
GND 8
1
2
SP3486 16 VCC
15 DI4
4
14 DO4A
13 DO4B
12 EN
11 DO3B
10 DO3A
3
9 DI3
DI1 1
DO1A 2
DO1B 3
EN1/EN2 4
DO2B 5
DO2A 6
DI2 7
GND 8
1
2
SP3487 16 VCC
15 DI4
4
14 DO4A
13 DO4B
12 EN3/EN4
11 DO3B
10 DO3A
3
9 DI3
10/15/02
SP3486/3487 Low Power Quad RS485/422 Line Drivers
1
© Copyright 2002 Sipex Corporation
1 page  
FEATURES
The SP3486 and the SP3487 are +3.3V low power
quad line drivers that meet the specifications of
the RS-485 and RS-422 serial protocols. These
devices are pin-to-pin compatible with Sipex's
SP486 and SP487 devices as well as popular
industry standards. The SP3486 and SP3487
devices feature Sipex's BiCMOS process
allowing low power operation without sacrificing
performance.
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 accomodate
ground potential differences. Data is virtually
immune to noise in the transmission line because
the RS-485 protocol is a differential interface.
Driver
The drivers for both the SP3486 and SP3487
have differential outputs. The typical voltage
output swing with no load will be 0V to +5V.
With worst case loading of 54Ω across the
differential outputs, the driver can maintain
greater than +1.5V voltage levels.
The drivers of the SP3486 feature active HIGH
and active LOW common driver enable
controls. Refer to SP3486 Truth Table in Table
1. The SP3487 provides independent, active
high driver enable controls for each pair of
drivers. Refer to SP3487 Truth Table in Table 2.
The driver outputs are short-circuit limited
to 250mA. The SP3486 and SP3487 drivers
meet the electrical specifications of RS-485
and RS-422 serial protocols up to 10Mbps
under load.
AC PARAMETERS
VCC = +3.3V±5%; typicals at 25°C; TAMB = 25°C unless otherwise noted.
PARAMETER
MIN. TYP. MAX.
PROPAGATION DELAY
Driver Input to Output
Low to High (tPLH)
High to Low (tPHL)
Differential Driver Skew
20 40 60
20 40 60
5 10
Driver Rise Time (tR)
SP3486
SP3487
Driver Fall Time (tF)
SP3486
SP3487
DRIVER ENABLE
To Output High
To Output Low
10
10
10
10
110
110
DRIVER DISABLE
From Output Low
From Output High
110
110
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CONDITIONS
Figure 2 and 5
| tPHL(Y) - tPLH(Y) |, | tPHL(Z) - tPLH(Z) | ,
Figures 2 and 5
10% to 90% RDIFF = 60Ω
90% to 10% RDIFF = 60Ω
Figures 3 and 6
Figures 4 and 6
Figures 4 and 6
Figures 3 and 6
10/15/02
SP3486/3487 Low Power Quad RS485/422 Line Drivers
5
© Copyright 2002 Sipex Corporation
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SP3487.PDF ] | |
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