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PDF SP3488 Data sheet ( Hoja de datos )
| Número de pieza | SP3488 | |
| Descripción | +3.3V Low Power Quad RS-485/RS-422 Line Receivers | |
| Fabricantes | Sipex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP3488 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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®
SP3488 and SP3489
+3.3V Low Power Quad
RS-485/RS-422 Line Receivers
■ RS-485 or RS-422 Quad Differential
Line Receivers
■ 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
(SP3488)
■ Independent Driver Enable Controls
for each pair of Drivers (SP3489)
■ Compatibility with LTC488
and SN75173 (SP3488)
■ Compatibility with LTC489
and SN75175 (SP3489)
DESCRIPTION…
The SP3488 and the SP3489 are +3.3V low power quad line receivers that meet the
specifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin
compatible with Sipex's SP488 and SP489 devices as well as popular industry standards.
The SP3488 and SP3489 feature Sipex's BiCMOS process allowing low power operation
without sacrificing performance. The SP3488 and SP3489 meet the electrical specifications
of RS-485 and RS-422 serial protocols up to 10Mbps under load. The SP3488 features a
common receiver enable control. The SP3489 provides independent receiver enable
controls for each pair of receivers. Both devices feature tri-state outputs and a -7V to +12V
common-mode input range. The receivers have a fail-safe feature which forces a logic "1"
output when receiver inputs are left floating.
RI1B 1
RI1A 2
RO1 3
EN 4
RO2 5
RI2A 6
RI2B 7
GND 8
1
2
SP3488 16 VCC
RI1B 1
15 RI4B
RI1A 2
4 14 RI4A RO1 3
13 RO4 EN1/EN2 4
12 EN
RO2 5
11 RO3
RI2A 6
3
10 RI3A
RI2B 7
9 RI3B
GND 8
1
2
SP3489 16 VCC
15 RI4B
4 14 RI4A
13 RO4
12 EN3/EN4
11 RO3
3 10 RI3A
9 RI3B
10/16/02
SP3488/3489 Low Power Quad RS-485/422 Line Receivers
1
© Copyright 2002 Sipex Corporation
1 page  
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. Because the
RS-485 protocol is a differential interface, data
is virtually immune to noise in the transmission
line.
Receiver...
The SP3488 and the SP3489 receivers have
differential inputs with an input sensitivity
as low as +100mV. 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 SP3488 features active HIGH and active
LOW common receiver enable controls. Refer
to SP3488 Truth Table in Table 1. The SP3489
provides independent, active high receiver
enable controls for each pair of receivers. Refer
to SP3489 Truth Table in Table 2. Both devices
feature tri-state outputs and a -7V to +12V
common-mode input range permitting a +7V
ground difference between devices on the
communication bus. The SP3488 and the SP3489
are equipped with a fail-safe feature which forces
a logic HIGH at the receiver output when the
input is left floating. The SP3488 and SP3489
receivers meet the electrical specifications of
RS-485 and RS-422 serial protocol data rates 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
Receiver Input to Output
Low to HIGH (tPLH)
High to LOW (tPHL)
Differential Receiver Skew (tSKD)
Receiver Rise Time (tR)
SP3488
SP3489
Receiver Fall Time (tF)
SP3488
SP3489
RECEIVER ENABLE
To Output HIGH
75 115
80 115
4
7 15
7 15
6 15
6 15
46 100
To Output LOW
46 100
RECEIVER DISABLE
From Output LOW
From Output HIGH
46 100
46 100
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CONDITIONS
CL = 15pF; Figure 1, 3
10% to 90%
90% to 10%
CL = 15pF; Figures 2 and 4
(S2 closed)
CL = 15pF; Figures 2 and 4
(S1 closed)
CL = 15pF; Figures 2 and 4
(S1 closed)
CL = 15pF; Figures 2 and 4
(S2 closed)
10/16/02
SP3488/3489 Low Power Quad RS-485/422 Line Receivers
5
© Copyright 2002 Sipex Corporation
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SP3488.PDF ] | |
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