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MAX3096CSE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3096CSE Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 11 page Applications Information Propagation-Delay Matching The MAX3095/MAX3096 exhibit propagation delays that are closely matched from one device to another, even between devices from different production lots. This fea- ture allows multiple data lines to receive data and clock signals with minimal skewing with respect to each other. The MAX3095 receiver propagation delays are trimmed to a predetermined value ±8ns, while the MAX3096 delays are trimmed to a predetermined value ±10ns. 128 Receivers on the Bus The standard RS-485 input impedance is 12k Ω (one- unit load). The standard RS-485 transmitter can drive 32 unit loads. The MAX3095/MAX3096 present a 1/4- unit-load input impedance (48k Ω), which allows up to 128 receivers on a bus. Any combination of these RS- 485 receivers with a total of 32 unit loads can be con- nected to the same bus. Fail-Safe Implementation The MAX3095/MAX3096 receiver inputs guarantee a logic high output when the inputs are open circuit (no termination resistor used). This occurs when the trans- mitter is removed from the bus or when all transmitter outputs are high impedance. However, when the line is terminated and the transmitters are disabled, the differ- ential voltage between the A and B inputs falls below the ±200mV RS-485 sensitivity threshold. Consequent- ly, the outputs become undefined. To maintain a fail- safe receiver output while using a terminating resistor, input A must be biased at least 200mV above input B. The resistor-divider network shown in Figure 6 is rec- ommended. Chip Information TRANSISTOR COUNT: 676 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers 10 ______________________________________________________________________________________ 1k 1k 150 Ω MAX3095 MAX3096 VCC A B Figure 6. External Fail-Safe Implementation PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 16 PDIP P16-1 21-0043 16 QSOP E16-5 21-0055 16 SO S16-5 21-0041 |
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