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LTC6991 Datasheet(PDF) 4 Page - Linear Technology |
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LTC6991 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 24 page  LTC6991 6991f elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 2.25V to 5.5V, RST = 0V, DIVCODE = 0 to 15 (NDIV = 1 to 221), RSET = 50k to 800k, RLOAD = ∞, CLOAD = 5pF unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Digital I/O RST Pin Input Capacitance 2.5 pF RST Pin Input Current RST = 0V to V+ ±10 nA VIH High Level RST Pin Input Voltage (Note 6) l 0.7 • V+ V VIL Low Level RST Pin Input Voltage (Note 6) l 0.3 • V+ V IOUT(MAX) Output Output Current V+ = 2.7V to 5.5V ±20 mA VOH High Level Output Voltage (Note 7) V+ = 5.5V IOUT = –1mA IOUT = –16mA l l 5.45 4.84 5.48 5.15 V V V+ = 3.3V IOUT = –1mA IOUT = –10mA l l 3.24 2.75 3.27 2.99 V V V+ = 2.25V IOUT = –1mA IOUT = –8mA l l 2.17 1.58 2.21 1.88 V V VOL Low Level Output Voltage (Note 7) V+ = 5.5V IOUT = 1mA IOUT = 16mA l l 0.02 0.26 0.04 0.54 V V V+ = 3.3V IOUT = 1mA IOUT = 10mA l l 0.03 0.22 0.05 0.46 V V V+ = 2.25V IOUT = 1mA IOUT = 8mA l l 0.03 0.26 0.07 0.54 V V tRST Reset Propagation Delay V+ = 5.5V V+ = 3.3V V+ = 2.25V 16 24 40 ns ns ns tWIDTH Minimum Input Pulse Width V+ = 3.3V 5 ns tr Output Rise Time (Note 8) V+ = 5.5V V+ = 3.3V V+ = 2.25V 1.1 1.7 2.7 ns ns ns tf Output Fall Time (Note 8) V+ = 5.5V V+ = 3.3V V+ = 2.25V 1.0 1.6 2.4 ns ns ns Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC6991C is guaranteed functional over the operating temperature range of –40°C to 85°C. Note 3: The LTC6991C is guaranteed to meet specified performance from 0°C to 70°C. The LTC6991C is designed, characterized and expected to meet specified performance from –40°C to 85°C but it is not tested or QA sampled at these temperatures. The LTC6991I is guaranteed to meet specified performance from –40°C to 85°C. The LTC6991H is guaranteed to meet specified performance from –40°C to 125°C. Note 4: Frequency accuracy is defined as the deviation from the fOUT equation, assuming RSET is used to program the frequency. Note 5: See Operation section, Table 1 and Figure 2 for a full explanation of how the DIV pin voltage selects the value of DIVCODE. Note 6: The RST pin has hysteresis to accommodate slow rising or falling signals. The threshold voltages are proportional to V+. Typical values can be estimated at any supply voltage using VRST(RISING) ≈ 0.55 • V+ + 185mV and VRST(FALLING) ≈ 0.48 • V+ – 155mV. Note 7: To conform to the Logic IC Standard, current out of a pin is arbitrarily given a negative value. Note 8: Output rise and fall times are measured between the 10% and the 90% power supply levels with 5pF output load. These specifications are based on characterization. Note 9: Settling time is the amount of time required for the output to settle within ±1% of the final frequency after a 0.5 × or 2× change in ISET. Note 10: Jitter is the ratio of the deviation of the period to the mean of the period. This specification is based on characterization and is not 100% tested. |
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