■+5V Only
■Low Power BiCMOS ■Driver/Receiver Enable
■
Slew Rate Limited Driver for Low EMI (SP483)
■Low Power Shutdown Mode (SP481and SP483)
■RS-485 and RS-422 Drivers/Receivers
DESCRIPTION
The SP481, SP483, and the SP485 are a family of half-duplex transceivers that meet the requirements of RS-485 and RS-422. Their BiCMOS design allows low power operation without sacrificing performance. The SP481 and SP485 meet the requirements of RS-485and RS-422 up to 5Mbps. Additionally, the SP481 is equipped with a low power Shutdown mode. The SP483 is internally slew rate limited to reduce EMI and can meet the requirements of RS-485 and RS-422 up to 250kbps. The SP483 is also equipped with a low power Shutdown mode.
ABSOLUTE MAXIMUM RATINGS
The are stress ratings only and functional operation of the device at the ratings or any other above tho indicated in the operation ctions of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
V CC ............................................................................................................±12V Input Voltages
<-0.3V to (V CC +0.-0.3V to (V CC +0.5V)Receivers.. (15)
Output Voltages
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<-0.3V to (V CC +0. ±.-0.3V to (V CC +0.5V)
-65˚C to +150˚C 500mW
SPECIFICATIONS
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SPECIFICATIONS (continued)
PIN FUNCTION
Pin# Name Description
1 RO Receiver Output.
2 RE Receiver Output Enable
Active LOW.
3 DE Driver Output Enable
Active HIGH.
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4 DI Driver Input.
5 GND Ground Connection.
6 A Driver Output/Receiver Input
Non-inverting.
7 B Driver Output/Receiver Input
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Inverting.
啁啾怎么读8 Vcc Positive Supply 4.75V<Vcc< 5.25V.
SP483 AC SPECIFICATIONS
T to T and V = 5V ± 5% unless otherwi noted.
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Receivers
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SP481, SP483, SP485
社会治安
The SP481, SP483, and SP485 receivers have differential inputs with an input nsitivity as low as ±200mV. Input impedance of the receiv-ers is typically 15k Ω (12k Ω minimum). A wide common m
ode range of -7V to +12V allows for large ground potential differences between systems. The receivers of the SP481, SP483and SP485 have a tri-state enable control pin.A logic LOW on RE (pin 4) will enable the receiver, a logic HIGH on RE (pin 4) will disable the receiver.real崔雪莉
The receiver for the SP481 and SP485 will operate up to at least 5Mbps. The SP483 receiver is rated for data rates up to 250kbps. The receiver for each of the three devices is 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.Shutdown Mode SP481/SP483
The SP481 and SP483 are equipped with a Shutdown mode. To enable the Shutdown state,both the driver and receiver must be disabled simultaneously. A logic LOW on DE (pin 5) and a logic HIGH on RE (pin 4) will put the SP481or SP483 into Shutdown mode. In Shutdown,supply current will drop to typically 1µA.
DESCRIPTION
SP481, SP483, SP485
The SP481, SP483, and SP485 are half-duplex differential transceivers that meet the require-ments
of RS-485 and RS-422. Fabricated with a Sipex proprietary BiCMOS process, all three products require a fraction of the power of older bipolar designs.
The RS-485 standard is ideal for multi-drop applications and 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-485transceivers are equipped with a wide (-7V to +12V) common mode range to accommodate ground potential differences. Becau RS-485 is a differential interface, data is virtually immune to noi in the transmission line.Drivers
SP481, SP483, SP485
The driver outputs of the SP481, SP483, and SP485 are differential outputs meeting the RS-485 and RS-422 standards. The typical voltage output swing with no load will be 0 volts to +5volts. With worst ca loading of 54Ω across the differential outputs, the drivers can maintain greater than 1.5V voltage levels. The drivers of the SP481, SP483 and SP485 have an enable control line which is active HIGH. A logic HIGH on DE (pin 5) will enable the differential driver outputs. A logic LOW on DE (pin 5) will tri-state the driver outputs.
The transmitters of the SP481 and SP485 will operate up to at least 5Mbps. The SP483 has internally slew rate limited driver outputs to minimize EMI. The maximum data rate for the SP483 driver is 250kbps.
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