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AT27C020-55PI Datasheet(PDF) 2 Page - ATMEL Corporation |
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AT27C020-55PI Datasheet(HTML) 2 Page - ATMEL Corporation |
2 / 9 page AT27C020 2 The AT27C020 is available in a choice of industry standard JEDEC-approved one-time programmable (OTP) plastic PDIP, PLCC, and TSOP packages. All devices feature two- line control (CE, OE) to give designers the flexibility to pre- vent bus contention. With 256K byte storage capability, the AT27C020 allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media. Atmel’s 27C020 have additional features to ensure high quality and efficient production use. The Rapid ™ Program- ming Algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 100 µs/byte. The Integrated Product Identification Code electronically identifies the device and manufacturer. This feature is used by industry standard programming equipment to select the proper programming algorithms and voltages. System Considerations Switching between active and standby conditions via the Chip Enable pin may produce transient voltage excursions. Unless accommodated by the system design, these tran- sients may exceed data sheet limits, resulting in device non-conformance. At a minimum, a 0.1 µF high frequency, low inherent inductance, ceramic capacitor should be uti- lized for each device. This capacitor should be connected between the V CC and Ground terminals of the device, as close to the device as possible. Additionally, to stabilize the supply voltage level on printed circuit boards with large EPROM arrays, a 4.7 µF bulk electrolytic capacitor should be utilized, again connected between the V CC and Ground terminals. This capacitor should be positioned as close as possible to the point where the power supply is connected to the array. Block Diagram |
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