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LM40 Scheda tecnica(PDF) 6 Page - National Semiconductor (TI) |
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LM40 Scheda tecnica(HTML) 6 Page - National Semiconductor (TI) |
6 / 27 page AC Electrical Characteristics (Continued) The following specification apply for V+ = +3.0 V DC to +3.6 VDC, unless otherwise specified. Boldface limits apply for T A =TJ =TMIN=0˚C to TMAX=85˚C; all other limits TA =TJ = 25˚C. The SensorPath Characteristics conform to the SensorPath specification revision 0.98. Please refer to that speciation for further details. Symbol Parameter Conditions Typical (Note 7) Limits (Note 8) Units (Limits) t r SWD rise time (Note 16) R pull-up=1.25 k Ω ±30%, C L=400 pF 1000 ns (max) t INACT Minimum inactive time (bus at high level) guaranteed by the slave before an attention request 11 µs (min) t Mtr0 Master drive for Data Bit 0 write and for Data Bit 0-1read 11.8 µs (min) 17.0 µs (max) t Mtr1 Master drive for Data Bit 1 write 35.4 µs (min) 48.9 µs (max) t SFEdet Time allowed for LM40 activity detection 9.6 µs (max) t SLout1 LM40 drive for Data Bit 1 read by master 28.3 µs (min) 38.3 µs (max) t MtrS Master drive for Start Bit 80 µs (min) 109 µs (max) t SLoutA LM40 drive for Attention Request 165 µs (min) 228 µs (max) t RST Master or LM40 drive for Reset 354 µs (min) t RST_MAX Maximum drive of SWD by an LM40, after the power supply is raised above 3V 500 ms (max) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: All voltages are measured with respect to GND, unless otherwise noted. Note 3: When the input voltage (VIN) at any pin exceeds the power supplies (VIN < GND or VIN > V+), the current at that pin should be limited to 5 mA. Parasitic components and/or ESD protection circuitry are shown below for the LM40’s pins. The nominal breakdown voltage of the zener is 6.5 V. SNP stands for snap-back device. www.national.com 6 |
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