Tue Sep 06, 4: Except for CEall like in. For programming, the datashret to be programmed is ap. Tue Sep 06, 9: After the final address is completed. CE input inhibits the other devices from being pro.
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All devices feature two- line control CE, OE to give designers the flexibility to pre- vent bus contention. With K byte storage capability, the AT27C allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media. 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.
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. 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. This capacitor should be positioned as close as possible to the point where the power supply is connected to the array.
27C020 DATASHEET PDF