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X9C102S Datasheet(PDF) 3 Page - Xicor Inc. |
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X9C102S Datasheet(HTML) 3 Page - Xicor Inc. |
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3 / 15 page  X9C102/103/104/503 3 DEVICE OPERATION There are three sections of the X9C102/103/104/503: the input control, counter and decode section; the non- volatile memory; and the resistor array. The input control section operates just like an up/down counter. The output of this counter is decoded to turn on a single electronic switch connecting a point on the resistor array to the wiper output. Under the proper conditions the contents of the counter can be stored in nonvolatile memory and retained for future use. The resistor array is comprised of 99 individual resistors connected in series. At either end of the array and between each resistor is an electronic switch that transfers the potential at that point to the wiper. The INC, U/D and CS inputs control the movement of the wiper along the resistor array. With CS set LOW the X9C102/103/104/503 is selected and enabled to respond to the U/ D and INC inputs. HIGH to LOW transitions on INC will increment or decrement (depending on the state of the U/ D input) a seven-bit counter. The output of this counter is decoded to select one of one-hundred wiper positions along the resistive array. The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. That is, the counter does not wrap around when clocked to either extreme. The value of the counter is stored in nonvolatile memory whenever CS transistions HIGH while the INC input is also HIGH. When the X9C102/103/104/503 is powered-down, the last counter position stored will be maintained in the nonvolatile memory. When power is restored, the con- tents of the memory are recalled and the counter is reset to the value last stored. OPERATION NOTES The system may select the X9C102/103/104/503, move the wiper, and deselect the device without having to store the latest wiper, position in nonvolatile memory. The wiper movement is performed as described above; once the new position is reached, the system would the keep INC LOW while taking CS HIGH. The new wiper position would be maintained until changed by the system or until a power-down/up cycle recalled the previously stored data. This would allow the system to always power-up to a preset value stored in nonvolatile memory; then during system operation minor adjustments could be made. The adjustments might be based on user preference: system parameter changes due to temperature drift, etc... The state of U/ D may be changed while CS remains LOW. This allows the host system to enable the X9C102/103/104/503 and then move the wiper up and down until the proper trim is attained. TIW/RTOTAL The electronic switches on the X9C102/103/104/503 operate in a “make before break” mode when the wiper changes tap positions. If the wiper is moved several positions, multiple taps are connected to the wiper for tIW (INC to VW change). The RTOTAL value for the device can temporarily be reduced by a significant amount if the wiper is moved several positions. RTOTAL with VCC Removed The end to end resistance of the array will fluctuate once VCC is removed. SYMBOL TABLE WAVEFORM INPUTS OUTPUTS Must be steady Will be steady May change from LOW to HIGH Will change from LOW to HIGH May change from HIGH to LOW Will change from HIGH to LOW Don’t Care: Changes Allowed Changing: State Not Known N/A Center Line is High Impedance |
Similar Part No. - X9C102S |
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Similar Description - X9C102S |
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