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LTC1535ISW Datasheet(PDF) 4 Page - Linear Technology |
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LTC1535ISW Datasheet(HTML) 4 Page - Linear Technology |
4 / 18 page LTC1535 4 1535fb ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS tSJ Data Sample Jitter Figure 8, (Note 7) l 250 285 ns fMAX Max Baud Rate Jitter = 10% Max, SLO = 1, (Note 8) l 250 410 kBd tPLH Driver Input to Output DE = 1, SLO = 1, Figure 4, Figure 6 DE = 1, SLO = 0, Figure 4, Figure 6 l l 600 1300 855 1560 ns ns tPHL Driver Input to Output DE = 1, SLO = 1, Figure 4, Figure 6 DE = 1, SLO = 1, Figure 4, Figure 6 l l 600 1300 855 1560 ns ns tr, tf Driver Rise or Fall Time DE = 1, SLO = 1, Figure 4, Figure 6 DE = 1, SLO = 0, VCC = VCC2 = 4.5V l l 150 20 500 100 1000 ns ns tZH Driver Enable to Output DI = 1, SLO = 1, Figure 5, Figure 7 l 1000 1400 ns tZL Driver Enable to Output DI = 0, SLO = 1, Figure 5, Figure 7 l 1000 1400 ns tLZ Driver Disable to Output DI = 0, SLO = 1, Figure 5, Figure 7 l 700 1300 ns tHZ Driver Disable to Output DI = 1, SLO = 1, Figure 5, Figure 7 l 700 1300 ns tPLH Receiver Input to RO RE = 0, Figure 3, Figure 8 l 600 855 ns tPHL Receiver Input to RO RE = 0, Figure 3, Figure 8 l 600 855 ns tPLH Receiver Input to RO2 RE = 0, Figure 3, Figure 8 30 ns tPHL Receiver Input to RO2 RE = 0, Figure 3, Figure 8 30 ns tr, tf Receiver Rise or Fall Time RE = 0, Figure 3, Figure 8 20 ns tLZ Receiver Disable to Output Figure 3, Figure 9 30 ns tHZ Receiver Disable to Output Figure 3, Figure 9 30 ns tSTART Initial Start-Up Time (Note 9) 1200 ns tTOF Data Time-Out Fault (Note 9) 1200 ns ST1, ST2 Duty Cycle 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C l l 56 57 % % The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, VCC2 = 5V, R = 27Ω (RS485) unless otherwise noted. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: RS422 50Ω specification based on RS485 27Ω test. Note 3: IIN is tested at VCC2 = 5V, guaranteed by design from GND2 ≤ VCC2 ≤ 5.25V. Note 4: Input fault conditions on the RS485 receiver are detected with a fixed receiver offset. The offset is such that an input short or open will result in a high data output. Note 5: The low voltage detect faults when VCC2 or VCC drops below VUVL and reenables when greater than VUVH. The fault can be monitored through the weak driver output on RE. Note 6: Value derived from 1 second test. Note 7: The input signals are internally sampled and encoded. The internal sample rate determines the data output jitter since the internal sampling is asynchronous with respect to the external data. Nominally, a 4MHz internal sample rate gives 250ns of sampling uncertainty in the input signals. Note 8: The maximum baud rate is 250kBd with 10% sampling jitter. Lower baud rates have lower jitter. Note 9: Start-up time is the time for communication to recover after a fault condition. Data time-out is the time a fault is indicated on RE after data communication has stopped. Note 10: ICC measured with no load, ST1 and ST2 floating. |
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