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SP3494EN Datasheet(PDF) 6 Page - Sipex Corporation |
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SP3494EN Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 11 page 6 10/16/02 SP3493/3494 +3.3V Low Power Slew-Rate Limited RS-485/RS-422 Transceivers © Copyright 2002 Sipex Corporation DESCRIPTION The SP3493/3494 are +3.3V transceivers that meet the electrical specifications of the RS-485 and RS-422 serial protocols. The SP3493/3494 feature Sipex's BiCMOS process allowing low power operation without sacrificing performance. The SP3493 device is a +3.3V full-duplex transceiver that is pin-to-pin compatible with the Sipex SP3490 and SP490 devices as well as popular industry standards such as the MAX3488, the LTC490, and the 75179. The SP3493 has a driver with a data transmission rate of 250kbps. The SP3494 device is a +3.3V half-duplex transceiver that is pin-to-pin compatible with the Sipex SP3481 and SP481 devices as well as popular industry standards such as the MAX3486 and the 75176. The SP3494 has a partially slew- rate limited driver with a data transmission rate of 2.5Mbps. Drivers The SP3493/3494devices both have differential outputs. The typical voltage output swing with no load will bo 0V to V CC. With worst case loading of 54 Ω across the differential outputs, the driver can maintain greater than 1.5V voltage levels. The SP3494 device has 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 DE (pin 3) will force the driver outputs at high impedance (high-Z). The SP3493 device does not have a driver enable. The SP3493/SP3494 drivers will operate up to 250kbps and 2.5Mbps, respectively. In addition to adhering to the 250mA I SC maximum limit on the driver output, the driver output short-circuit protection will allow the devices to withstand an infinite short circuit over the -7.0V to +12V common mode range without damage. Receivers The receivers have differential inputs with an input sensitivity as low +200mV. Input impedance of the receivers is typically 15k Ω (12k Ω minimum). A wide common mode range of -7V to +12V allows for large ground potential differences between systems. Both the SP3493/SP3494 receivers are equipped with fail-safe which guarantees that the receiver outputs will be in a high state when the input is left unconnected. The SP3494 receiver has a high impedance (high-Z) enable control pin. A logic LOW on RE (pin 2) will enable the receiver; a logic HIGH on RE (pin 2) will disable the receiver. The SP3494 is 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 3) and a logic HIGH on RE (pin 2) will put the SP3494 into shutdown. In shutdown, the supply current will drop to 2nA typical, 1 µA maximum. |
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