ISL43485 Intersil Corporation, ISL43485 Datasheet
ISL43485
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ISL43485 Summary of contents
Page 1
... Receiver (Rx) inputs feature a “fail-safe if open” design, which ensures a logic high output if Rx inputs are floating, and the ISL43485 presents a “single unit load” to the RS-485 bus, which allows transceivers on the network. Driver (Tx) outputs are short circuit protected, even for voltages exceeding the power supply voltage ...
Page 2
... Typical Operating Circuit +3. B/Z A GND 5 2 ISL43485 OUTPUTS High-Z High-Z High-Z * High-Z * NOTE: *Shutdown Mode FUNCTION ISL43485 + 0.1µ RECEIVING INPUTS DE A-B ≥ +0. ≤ -0. Inputs Open +3.3V + 0.1µ ...
Page 3
... Operating Conditions Temperature Range ISL43485I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to 85°C CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. ...
Page 4
... PLH PHL SKD Receiver Enable to Output High t Receiver Enable to Output Low t Receiver Disable from Output High t Receiver Disable from Output Low t 4 ISL43485 = 3V to 3.6V; Unless Otherwise Specified. Typicals are TEST CONDITIONS 0.4V ≤ V ≤ 2.4V O -7V ≤ V ≤ 12V ...
Page 5
... When testing this parameter, the RE signal high time must be short enough (typically <100ns) to prevent the device from entering SHDN. 7. The ISL43485 is put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to have entered shutdown. See “ ...
Page 6
... PARAMETER OUTPUT Y/Z 0 (Note Y/Z 0 (Note Y/Z 1 (Note 8) ZH(SHDN) t Y/Z 1 (Note 8) ZL(SHDN) FIGURE 3A. TEST CIRCUIT 6 ISL43485 (Continued 15pF 60Ω DIFF C = 15pF L OUT (Y) OUT (Z) = 27Ω DIFF OUT ( 15pF ≈ 1. SKEW = |t 2 110Ω ...
Page 7
... RS-422 and RS-485 are intended for runs as long as 4000’, so the wide CMR is necessary to handle ground potential differences, as well as voltages induced in the cable by external fields. 7 ISL43485 (Continued) 15pF A RO 1kΩ ...
Page 8
... The driver features low propagation delay skew to CC maximize bit width, and to minimize EMI, and it is tri-statable via the active high DE input. Outputs of the ISL43485 driver are not slew rate limited, so faster output transition times allow data rates of at least 30Mbps. Data Rate, Cables, and Terminations Twisted pair is the cable of choice for RS-485, RS-422 networks ...
Page 9
... LOW 100 - HIGH -40 -60 -80 -100 -120 - OUTPUT VOLTAGE (V) FIGURE 10. DRIVER OUTPUT CURRENT vs SHORT CIRCUIT VOLTAGE 9 ISL43485 V = 3.3V 25°C; Unless Otherwise Specified 1.5 0 -1.5 -3 FIGURE 7. DRIVER AND RECEIVER WAVEFORMS DRIVING ) 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2 ...
Page 10
... 2.5 B/Z 2 1.5 1 A/Y 0.5 0 TIME (10ns/DIV) FIGURE 14. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH Die Characteristics SUBSTRATE POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 528 PROCESS: Si Gate BiCMOS 10 ISL43485 V = 3.3V 25°C; Unless Otherwise Specified (Continued 3.5 t PLHZ 3 2.5 t PLHY 2 t PHLY 1 -40 = 54Ω ...
Page 11
... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 11 ISL43485 M8.15 (JEDEC MS-012-AA ISSUE C) 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC ...