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SP3483 데이터시트 PDF




Exar에서 제조한 전자 부품 SP3483은 전자 산업 및 응용 분야에서
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부품번호 SP3483 기능
기능 +3.3V Low Power Slew Rate Limited Half-Duplex RS-485 Transceiver
제조업체 Exar
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SP3483 데이터시트, 핀배열, 회로
SP3483
+3.3V Low Power Slew Rate Limited
Half-Duplex RS-485 Transceiver
• RS-485 and RS-422 Transceiver
• Operates from a single +3.3V Supply
• Interoperable with +5.0V logic
• Driver/Receiver Enable
• Low Power Shutdown mode
• -7V to +12V Common-Mode Input Voltage Range
• Allows up to 32 transceivers on the serial bus
• Compatibility with the industry standard
75176 pinout
• Driver Output Short-Circuit Protection
• Slew Rate Limited Driver for Low EMI
DESCRIPTION
The SP3483 device is part of a family of +3.3V low power half-duplex transceivers that meet
the specifications of the RS-485 and RS-422 serial protocols. This device is pin-to-pin compat-
ible with the Exar SP483 device as well as popular industry standards. The SP3483 features
Exar's BiCMOS design allowing low power operation without sacrificing performance. The
SP3483 is slew rate limited to reduce EMI and can meet the requirements of the RS-485
and RS-422 protocols up to 250kbps.
INPUTS
RE DE DI
X 11
X 10
X 0X
LINE
CONDITION
No Fault
No Fault
X
OUTPUTS
BA
01
10
ZZ
Table 1. Transmit Function Truth Table
TRUTH TABLES
INPUTS
RE DE
00
00
00
10
A-B
+0.2V
-0.2V
Inputs Open
X
OUTPUTS
R
1
0
1
Z
Table 2. Receive Function Truth Table
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP3483_100_010912




SP3483 pdf, 반도체, 판매, 대치품
TMIN to TMAX and VCC = +3.3V +/-5% unless otherwise noted.
PARAMETERS
MIN. TYP.
Shutdown Timing
Time to Shutdown
50 200
Driver Enable from Shutdown
to Output High
Driver Enable from Shutdown
to Output Low
Receiver Enable from
Shutdown to Output High
Receiver Enable from
Shutdown to Output Low
POWER REQUIREMENTS
Supply Current
No Load
1000
800
Shutdown Mode
ELECTRICAL CHARACTERISTICS
MAX. UNITS CONDITIONS
600
2000
2000
2500
2500
ns RE = 5V, DE = 0V
ns Figures 4 and 11
ns Figures 5 and 11
ns Figures 7 and 13; S2 Closed, S1
open
ns Figures 7 and 13; S1 Closed, S2
open
2000
1500
10
µA RE, DI = 0V or VCC; DE = VCC
µA RE = 0V, DI = 0V or 5V; DE = 0V
µA DE = 0V, RE = VCC
PIN FUNCTION
Pin 1 - RO - Receiver Output
Pin 2 - RE - Receiver Output Enable Active LOW
Pin 3 - DE - Driver Output Enable Active HIGH
Pin 4 - DI - Driver Input
Pin 5 - GND - Ground Connection
Pin 6 - A - Driver Output / Receiver Input
Non-Inverting
Pin 7 - B - Driver Output / Receiver Input Inverting
Pin 8 - Vcc - Positive Supply
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3483_100_010912


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SP3483 전자부품, 판매, 대치품
The SP3483 device is part of a family of
+3.3V low power half-duplex transceivers
that meet the specifications of the RS-485
and RS-422 serial protocols. This device is
pin-to-pin compatible with the Exar SP483
device as well as popular industry standards.
The SP3483 features Exar's BiCMOS pro-
cess allowing low power operation without
sacrificing performance.
The RS-485 standard is ideal for multi-drop
applications and 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 accommodate ground potential differ-
ences. Because RS-485 is a differential
interface, data is virtually immune to noise
in the transmission line.
Drivers
The driver outputs of the SP3483 are dif-
ferential outputs meeting the RS-485 and
RS-422 standards. The typical voltage
output swing with no load will be 0 Volts to
+3.3 Volts. With worst case loading of 54Ω
across the differential outputs, the drivers
can maintain greater than 1.5V voltage
levels. The drivers have an enable control
line which is active HIGH. A logic HIGH on
DE (pin 3) will enable the differential driver
outputs. A logic LOW on the DE (pin 3) will
force the driver outputs into high impedance
(high-Z).
The SP3483 has internally slew rate lim-
ited driver outputs to minimize EMI. The
transceivers will operate up to 250kbps.
Touhtepu2t50amlloAwIsSCthmeaSxiPm3u4m83limtoit
on the driver
withstand an
infinite short circuit over the -7.0V to +12V
common mode range without catastrophic
damage to the IC.
Receivers
DESCRIPTION
The SP3483 receiver has differential inputs
with an input sensitivity 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 sys-
tems. The receiver of the SP3483 has a tri-
state enable control input RE (Pin 2). A logic
LOW on RE will enable the receiver, a logic
HIGH on RE will disable the receiver.
The receiver of the SP3483 will operate
up to 250kbps. The receiver is equipped
with the fail-safe feature. Fail-safe guar-
antees that the receiver output will be in a
HIGH state when the input is left uncon-
nected (open circuit).
Shutdown Mode
The SP3483 is equipped with a Shutdown
mode. To enable the shutdown state, both
driver and receiver must be disabled simul-
taneously. A logic LOW on DE (pin 3) and
a Logic HIGH on RE (pin 2) will put the
SP3483 into Shutdown mode. In Shutdown,
supply current will drop to typically 1µA,
10µA maximum.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP3483_100_010912

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