Datasheet LTC6990 (Analog Devices) - 4

LTC6990
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, OE = V+, DIVCODE = 0 to 15 (NDIV = 1 to 128), RSET = 25k to 800k, RLOAD = ∞, CLOAD = 5pF unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Digital I/O
OE Pin Input Capacitance 2.5 pF OE Pin Input Current OE = 0V to V+ l ±10 nA VIH High Level OE Pin Input Voltage (Note 6) l 0.7•V+ V VIL Low Level OE Pin Input Voltage (Note 6) l 0.3•V+ V OUT Pin Hi-Z Leakage OE = 0V, DIVCODE ≥ 8, OUT = 0V to V+ ±10 µA IOUT(MAX) Maximum Output Current ±20 mA VOH High Level Output Voltage V+ = 5.5V IOH = –1mA l 5.45 5.48 V (Note 7) IOH = –16mA l 4.84 5.15 V V+ = 3.3V IOH = –1mA l 3.24 3.27 V IOH = –10mA l 2.75 2.99 V V+ = 2.25V IOH = –1mA l 2.17 2.21 V IOH = –8mA l 1.58 1.88 V VOL Low Level Output Voltage V+ = 5.5V IOL = 1mA l 0.02 0.04 V (Note 7) IOL = 16mA l 0.26 0.54 V V+ = 3.3V IOL = 1mA l 0.03 0.05 V IOL = 10mA l 0.22 0.46 V V+ = 2.25V IOL = 1mA l 0.03 0.07 V IOL = 8mA l 0.26 0.54 V tPD Output Disable Propagation Delay V+ = 5.5V 17 ns V+ = 3.3V 26 ns V+ = 2.25V 44 ns tENABLE Output Enable Time NDIV ≤ 2, tOUT = 1/fOUT tPD to tOUT µs NDIV ≥ 4, tMASTER = tOUT/NDIV tPD to 2•tMASTER µs tr Output Rise Time (Note 8) V+ = 5.5V 1.1 ns V+ = 3.3V 1.7 ns V+ = 2.25V 2.7 ns tf Output Fall Time (Note 8) V+ = 5.5V 1.0 ns V+ = 3.3V 1.6 ns V+ = 2.25V 2.4 ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
See Operation section, Table 1 and Figure 2 for a full explanation may cause permanent damage to the device. Exposure to any Absolute of how the DIV pin voltage selects the value of DIVCODE. Maximum Rating condition for extended periods may affect device
Note 6:
The OE pin has hysteresis to accommodate slow rising or falling reliability and lifetime. signals. The threshold voltages are proportional to V+. Typical values can
Note 2:
The LTC6990C is guaranteed functional over the operating be estimated at any supply voltage using VOE(RISING) ≈ 0.55 • V+ + 185mV temperature range of –40°C to 85°C. and VOE(FALLING) ≈ 0.48 • V+ – 155mV.
Note 3:
The LTC6990C is guaranteed to meet specified performance from
Note 7:
To conform to the Logic IC Standard, current out of a pin is 0°C to 70°C. The LTC6990C is designed, characterized and expected to arbitrarily given a negative value. meet specified performance from –40°C to 85°C but it is not tested or
Note 8:
Output rise and fall times are measured between the 10% and the QA sampled at these temperatures. The LTC6990I is guaranteed to meet 90% power supply levels with 5pF output load. These specifications are specified performance from –40°C to 85°C. The LTC6990H is guaranteed based on characterization. to meet specified performance from –40°C to 125°C. The LTC6990MP is
Note 9:
Settling time is the amount of time required for the output to settle guaranteed to meet specified performance from –55°C to 125°C. within ±1% of the final frequency after a 0.5x or 2x change in ISET.
Note 4:
Frequency accuracy is defined as the deviation from the fOUT
Note 10:
Jitter is the ratio of the deviation of the period to the mean of the equation, assuming RSET is used to program the frequency. period. This specification is based on characterization and is not 100% tested. 6990fc 4 For more information www.linear.com/LTC6990 Document Outline Features Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Related Parts