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Nalkree 27C Datasheet This ensures that all deselect- ed memory devices are in their low power standby mode and that the 27d pins are only active when data is required from a particular memory device. Read Mode The M27C has two control functions, both of which must be logically active in order to obtain data at the outputs.

Testing Input Output Waveform 10 Figure 8. Exposure to Ab- solute Maximum Rating conditions for extended periods may affect device reliability. To activate the ES mode, the programming equipment must force The two line control function allows: The FDIP28W window ceramic frit-seal package has transparent lid which allows the user to ex- pose the chip to ultraviolet light to erase the bit pat- tern.

It is ideally suited for applica- tions where fast turn-around and pattern experi- mentation are important requirements and is organized as by 8 bits. Capacitance 10 Table 7. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. Drawing is not to scaie. A high level E input inhibits the other M27C51 2s from being pro- grammed.

The levels required for the address and data in- puts are TTL. It is recommended that a 0. A new pattern can then be written to the device by following the programming procedure. This can be achieved with STMicroelectronics M27C due to several design innovations described in the M27C datasheet to improve programming effi- ciency and to provide adequate margin for reliabil- ity.

A single power supply is required in theread mode. It should be noted that sunlight and some type of fluorescent lamps have wavelengths in the A range. The associated transient voltage peaks can be satasheet by complying with the two line output control and by properly selected decoupling capacitors. Operating Modes 6 Table 3. Package Outline 19 Table This mode is intended for use by programming equipment to automatically match the device to be programmed with its corresponding programming algorithm.

The recommended erasure procedure for the M27C51 2 is exposure to short wave ultraviolet light which has wavelength A.

All other address lines must be held at Vil during Electronic Signa- ture mode. For a list of available options speed, package, device, please contact your nearest ST Sales Of- etc. Research shows that constant exposure to room level fluorescent lighting could erase a typical M27C in about 3 years, while it would take ap- proximately 1 week to cause erasure when ex- posed to direct sunlight. Two identifier bytes may then be se- quenced from the device outputs by toggling ad- dress line AO from Vil to Vih.

Drawing is not to scaie Table No license is granted by implication or othenwise under any patent or rights of STMicroelectronics. Vqc is specified to be 6. Program Inhibit Programming of multiple M27Cs in parallel with different data is also easily accomplished. Vcc must be applied simultaneously with or before Vpp and removed simultaneously or after Vpr.

Specifications mentioned in this publication are subject to change without notice. TOP 10 Related.


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