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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LCC Connections 5 Figure 5. A high level E input inhibits the other M27C51 2s from being pro- grammed. All other address lines must be held at Vil during Electronic Signa- ture mode. Drawing is not to scaie Table Data is introduced by selectively program- ming ‘O’s into the desired bit locations. Ordering Information Scheme Example: For a list of available options speed, package, device, please contact your nearest ST Sales Of- etc.
Designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted parame- ters.
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. Although only ‘O’s will be programmed, both ‘1 ‘s and ‘O’s can be present in the data word.
The M27C should be placed within 2. 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. 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.
The purpose of datasbeet bulk capacitor is to overcome the voltage drop caused by the inductive effects of PCB traces. High Speed, see AC Characteristics section for further information.
Package Outline 19 Table A new pattern can then be written to the device by following the programming procedure. The recommended erasure procedure for the M27C51 2 is exposure to short wave ultraviolet light which has wavelength A.
27C EPROM Datasheet
Drawing is not to scaie. 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- tern.
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. The bulk capacitor should be located near the power supply connection point. 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. 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.
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This publication supersedes and replaces all information previously supplied. AC Measurement Conditions 10 Figure 7. Program Inhibit Programming of multiple M27Cs in parallel with different data is also easily accomplished. Exposure to Ab- solute Maximum Rating conditions for extended periods may affect device reliability. The two line control function allows: Logic Diagram 4 Table 1.
Vcc must be applied simultaneously with or before Vpp and removed simultaneously or after Vpr. 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. Minimum DC voltage on Input or Output is Two identifier bytes may then be se- quenced from the device outputs by toggling ad- dress line AO from Vil to Vih.
Operating Modes 6 Table 3. DIP Connections 5 Figure 4.
Package Mechanical Data 17 Figure Then a sequence of 1 00 is program pulses are ap- plied to each byte until a correct verify occurs. Specifications mentioned in this publication are subject to change without notice.
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. The associated transient voltage peaks can be suppressed by complying with the two line output control and by properly selected decoupling capacitors.
Search the history of over billion web pages on dafasheet Internet. Program Verify A verify read should be performed on the pro- grammed bits to determine that they were correct ly programmed. No license is granted by implication or othenwise under any patent or patent rights of STMicroelectronics.
Full text of ” IC Datasheet: STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. Ice, has three seg- ments that are of interest to the system designer: The M27C is in the pro- g.
Output Enable G is the output control and should be used to gate data to the output pins, indepen- dent of device selection. Capacitance 10 Table 7. To activate the ES mode, the programming equipment must force DIP Connections Figure 5. Package Outline 17 Table Some lamps have a filter on their tubes which should be removed before erasure.