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MAX1487EPA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1487EPA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 19 page __________Applications Information The MAX481/MAX483/MAX485/MAX487–MAX491 and MAX1487 are low-power transceivers for RS-485 and RS- 422 communications. The MAX481, MAX485, MAX490, MAX491, and MAX1487 can transmit and receive at data rates up to 2.5Mbps, while the MAX483, MAX487, MAX488, and MAX489 are specified for data rates up to 250kbps. The MAX488–MAX491 are full-duplex trans- ceivers while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are half-duplex. In addition, Driver Enable (DE) and Receiver Enable (RE) pins are included on the MAX481, MAX483, MAX485, MAX487, MAX489, MAX491, and MAX1487. When disabled, the driver and receiver outputs are high impedance. MAX487/MAX1487: 128 Transceivers on the Bus The 48kΩ, 1/4-unit-load receiver input impedance of the MAX487 and MAX1487 allows up to 128 transceivers on a bus, compared to the 1-unit load (12kΩ input impedance) of standard RS-485 drivers (32 trans- ceivers maximum). Any combination of MAX487/ MAX1487 and other RS-485 transceivers with a total of 32 unit loads or less can be put on the bus. The MAX481/MAX483/MAX485 and MAX488–MAX491 have standard 12kΩ Receiver Input impedance. Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers 8 _______________________________________________________________________________________ MAX488 MAX490 TOP VIEW 1 2 3 4 RO DI GND 8 7 6 5 A B Z Y VCC DIP/SO R D Rt Rt VCC 5 6 7 8 RO DI GND 4 GND DI RO 3 2 A B Y Z VCC DR R D 1 3 VCC 4 RO 2 A 1 6 5 7 8 GND DI Y Z B µMAX MAX488 MAX490 NOTE: TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE. MAX489 MAX491 DIP/SO TOP VIEW Rt Rt DE VCC RE GND VCC RE GND DE RO DI 9 10 12 11 B A Z Y 5 RO NC DI 2 1, 8, 13 3 6, 7 14 4 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VCC N.C. N.C. A B Z Y N.C. RO RE DE DI GND GND R D D RD R Figure 2. MAX488/MAX490 Pin Configuration and Typical Operating Circuit Figure 3. MAX489/MAX491 Pin Configuration and Typical Operating Circuit |
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