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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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X9C104S Fiches technique(PDF) 7 Page - Intersil Corporation |
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X9C104S Fiches technique(HTML) 7 Page - Intersil Corporation |
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7 / 11 page  7 FN8222.1 December 20, 2006 DETAILED PIN DESCRIPTIONS RH/VH and RL/VL The high (VH/RH) and low (V L/RL) terminals of the X9C102/103/104/503 are equivalent to the fixed termi- nals of a mechanical potentiometer. The minimum voltage is -5V and the maximum is +5V. The terminol- ogy of VH/RH and V L/RL references the relative position of the terminal in relation to wiper movement direction selected by the U/D input and not the voltage potential on the terminal. RW/VW VW/RW is the wiper terminal, and is equivalent to the movable terminal of a mechanical potentiometer. The position of the wiper within the array is determined by the control inputs. The wiper terminal series resistance is typically 40 Ω. Up/Down (U/D) The U/D input controls the direction of the wiper move- ment and whether the counter is incremented or dec- remented. Increment (INC) The INC input is negative-edge triggered. Toggling INC will move the wiper and either increment or decre- ment the counter in the direction indicated by the logic level on the U/D input. Chip Select (CS) The device is selected when the CS input is LOW. The current counter value is stored in nonvolatile memory when CS is returned HIGH while the INC input is also HIGH. After the store operation is com- plete the X9C102/103/104/503 device will be placed in the low power standby mode until the device is selected once again. PIN CONFIGURATION PIN NAMES PRINCIPLES OF OPERATION There are three sections of the X9Cxxx: the input con- trol, counter and decode section; the nonvolatile mem- ory; 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 com- prised 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 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 electronic switches on the device 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/RW change). The RTOTAL value for the device can temporarily be reduced by a significant amount if the wiper is moved several positions. When the device is powered-down, the last wiper posi- tion stored will be maintained in the nonvolatile mem- ory. When power is restored, the contents of the memory are recalled and the wiper is set to the value last stored. VCC CS VL/RL VW/RW INC U/D VSS 1 2 3 4 8 7 6 5 VH/RH X9C102/103/104/503 DIP/SOIC Symbol Description VH /RH High Terminal VW/RW Wiper Terminal VL/RL Low Terminal VSS Ground VCC Supply Voltage U/D Up/Down Control Input INC Increment Control Input CS Chip Select Control Input NC No Connection X9C102, X9C103, X9C104, X9C503 |
Numéro de pièce similaire - X9C104S |
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Description similaire - X9C104S |
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