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X20C04PI-25 Datasheet(PDF) 3 Page - Xicor Inc. |
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X20C04PI-25 Datasheet(HTML) 3 Page - Xicor Inc. |
3 / 15 page X20C04 3 Power-Up Recall Upon power-up (VCC), the X20C04 performs an auto- matic array recall. When VCC minimum is reached, the recall is initiated, regardless of the state of CE, OE, WE and NE. Write Protection The X20C04 has five write protect features that are employed to protect the contents of both the nonvolatile memory and the RAM. •VCC Sense—All functions are inhibited when VCC is ≤ 3.5V. • A RAM write is required before a Store Cycle is initiated. • Write Inhibit—Holding either OE LOW, WE HIGH, CE HIGH, or NE HIGH during power-up and power- down will prevent an inadvertent store operation. • Noise Protection—A combined WE, NE, OE and CE pulse of less than 20ns will not initiate a Store Cycle. • Noise Protection—A combined WE, NE, OE and CE pulse of less than 20ns will not initiate a recall cycle. DEVICE OPERATION The CE, OE, WE and NE inputs control the X20C04 operation. The X20C04 byte-wide NOVRAM uses a 2-line control architecture to eliminate bus contention in a system environment. The I/O bus will be in a high impedance state when either OE or CE is HIGH, or when NE is LOW. RAM Operations RAM read and write operations are performed as they would be with any static RAM. A read operation requires CE and OE to be LOW with WE and NE HIGH. A write operation requires CE and WE to be LOW with NE HIGH. There is no limit to the number of read or write operations performed to the RAM portion of the X20C04. Nonvolatile Operations With NE LOW, recall operation is performed in the same manner as RAM read operation. A recall operation causes the entire contents of the E2PROM to be written into the RAM array. The time required for the operation to complete is 5 µs or less. A store operation causes the entire contents of the RAM array to be stored in the nonvolatile E2PROM. The time for the operation to complete is 5ms or less. 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 |
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