Full text of “IC Datasheet: 27C EPROM Data Sheet” . several design innovations described in the M27C datasheet to improve programming effi- ciency. 27C Kilobit (64k X 8 Bit) CMOS EPROM. n Fast access time Speed options as fast ns n Low power consumption 20 µA typical CMOS standby current n. datasheet to improve programming efficiency and to provide adequate margin for reliability. Before starting the programming the internal MARGIN MODE circuit.

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Two identifier bytes may then be se- quenced from the device outputs by toggling ad- dress line AO from Vil to Vih.

However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use.

Testing Input Output Datzsheet 10 Figure 8. A single power supply is required in theread mode. AC Measurement Conditions 10 Figure 7. Some lamps datahseet a filter on their tubes which should be removed before erasure.

Vqc is specified to be 6. For a list of available options speed, package, device, please contact your nearest ST Sales Of- etc.

27C512 – 27C512 512K EPROM Datasheet

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. DIP Connections 5 Figure 4. No license is granted by implication or othenwise under any patent or patent rights of STMicroelectronics.


Drawing is not to scaie Table It is recommended that a 0.

Specifications mentioned in this publication are subject to change without notice. Package Outline 17 Table Full text of ” IC Datashset Ordering Information Scheme Example: Program Verify A verify read should be performed on the pro- grammed bits to determine that they were correct ly programmed. For the most efficient use of these two control lines, E should be decoded and used as the prima- ry device selecting function, while G should be made a common connection to all d evices in the array and connected to the READ line from the system control bus.

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 new pattern can then be written to the device by following the programming procedure.

(Datasheet) 27C pdf – CHMOS EPROM (1-page)

All other address lines must be held at Vil during Electronic Signa- ture mode. DIP Connections Figure 5. Operating Modes 6 Table 3.

Package Mechanical Data 17 Figure Ice, has three seg- ments that are of interest to the system designer: Output Enable G is the output datashete and should be used to gate data to the output pins, indepen- dent of device selection.


The verify is accomplished with G at V L. Chip Enable E is the power control and should be used for device selection. Although only ‘O’s will dwtasheet programmed, both ‘1 ‘s and ‘O’s can be present in the data word.

Minimum DC voltage on Input or Output is This mode is intended for use by programming equipment to automatically match the device to be programmed with its corresponding programming algorithm.

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. LCC Connections 5 Figure 5. The recommended erasure procedure for the M27C51 2 is exposure to short wave ultraviolet light which has wavelength A.

This publication supersedes and replaces all information previously supplied.

A high level E input inhibits the other M27C51 2s from being pro- grammed. To activate the ES mode, the programming equipment must force