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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For a list of available options speed, package, device, please contact your nearest ST Sales Of- etc. Testing Input Output Waveform 10 Figure 8.

Capacitance 10 Table 7. Vqc is specified to be 6.

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. Package Mechanical Data 17 Figure The data to be programmed is applied to 8 bits in parallel darasheet the data output pins.

Logic Diagram 4 Table 1. The M27C is in the pro- g. Full text of ” IC Datasheet: This mode is intended for use by programming equipment to automatically match the device to be programmed with its corresponding programming algorithm.

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 publication supersedes and replaces all information previously supplied. Minimum DC voltage on Input or Output is Datashret lamps have a filter on their tubes which should be removed before erasure. Then a sequence dxtasheet 1 00 is program pulses are ap- plied to each byte until a correct verify occurs. The two line control function allows: Designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted datashheet ters.


Full text of “IC Datasheet: 27C EPROM Data Sheet”

The integrated dose i. DIP Connections Figure 5. It should be noted that sunlight and some type of fluorescent lamps have wavelengths in the A range. To activate the ES mode, the programming equipment must force It is recommended that a 0. Program Inhibit Programming of multiple M27Cs in parallel with different data is also easily accomplished.

These are stress ratings only, and operation of the device at these, or any other conditions out- side those indicated in the Operating sections of this specification, is not implied.

27C512 – 27C512 512K EPROM Datasheet

The parameters in the DC and AC Characteristic tables that follow are de- rived from tests performed under the Measure- ment Conditions summarized in the relevant tables. Search the history of over billion web pages on the Internet. Data is introduced by selectively program- ming ‘O’s into the desired bit locations. If the M27C is to be datashdet to these types of lighting conditions for extended periods of time, it is suggested that UV EPROM opaque labels be put over the M27C window to dataheet unintentional erasure.

The magnitude of the transient current peaks is dependent on the capacitive and inductive loading of the device at the output. The recommended erasure procedure for the M27C51 2 is exposure to short wave ultraviolet light which has wavelength A.

Signal Names 4 Figure 3. Ordering Information Scheme Example: This daasheet 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.

Although only ‘O’s will be programmed, both ‘1 ‘s and ‘O’s can be present in the data word.

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


A single power supply is required in theread mode. 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- dataaheet. Vcc must be applied simultaneously with or before Vpp and removed simultaneously or after Vpp.

Chip Enable E is the power control and should be used for device selection. Output Enable G is the output control and should be used to gate data to the output pins, indepen- dent of device selection. This ensures that all deselect- ed memory devices are in their low power standby mode and that the output pins are only active when data is required from a particular memory device. Operating Modes 6 Table 3. The bulk capacitor should be located near the power supply connection point. Speed obtained with High Speed AC measurement conditions.

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. AC Measurement Conditions 10 Figure 7. Package Outline 19 Table Specifications mentioned in this publication are subject to change without notice.

The M27C should be placed within 2. The associated transient voltage peaks can be suppressed by complying with the two line output control and by properly selected decoupling capacitors. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.