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AT27C256R-55 Datasheet(PDF) 2 Page - ATMEL Corporation |
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AT27C256R-55 Datasheet(HTML) 2 Page - ATMEL Corporation |
2 / 9 page The AT27C256R is available in a choice of industry stand- ard JEDEC-approved one time programmable (OTP) plastic DIP, PLCC, SOIC, and TSOP packages. All de- vices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention. With 32K byte storage capability, the AT27C256R allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media. Atmel’s 27C256R has 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 program- ming algorithms and voltages. Description (Continued) Switching between active and standby conditions via the Chip Enable pin may produce transient voltage excur- sions. Unless accommodated by the system design, these transients may exceed data sheet limits, resulting in de- vice non-conformance. At a minimum, a 0.1 µF high fre- quency, low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor should be connected between the VCC 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 VCC and Ground terminals. This capacitor should be posi- tioned as close as possible to the point where the power supply is connected to the array. System Considerations 3-126 AT27C256R |
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