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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Capacitance 10 Table 7. 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. 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. Full text of ” IC Datasheet: It is recommended that a 0.
Drawing is not to scaie Table It should be noted that sunlight and some type of fluorescent lamps have wavelengths in the A range. The M27C should be placed within 2. Chip Enable E dqtasheet the daatsheet control and should be used for device selection.
DIP Connections 5 Figure 4. Specifications mentioned in this publication are subject to change without notice. Package Outline 17 Table 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. The two line control function allows: This ensures that all 2c512 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.
To activate the ES mode, the programming equipment must force 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. Program Inhibit Programming of multiple M27Cs in parallel with different data is also easily accomplished.
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This mode is intended for use by programming datashdet to automatically match the device to be programmed with its corresponding programming algorithm. The bulk capacitor should be located near the power supply connection point.
27C512 Datasheet PDF
Then a sequence of 1 00 is program pulses are ap- plied to each byte until a correct verify occurs. Although only ‘O’s will be programmed, both ‘1 ‘s and ‘O’s can be present in the data word.
Exposure to Ab- solute Maximum Rating conditions for extended periods may affect device reliability. Package Outline 19 Table The data to be programmed is applied to 8 bits in parallel to the data output pins. 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.
AC Measurement Conditions 10 Figure 7.
DIP Connections Figure 5. The levels required for the address and data in- puts are TTL. Operating Modes 6 Table 3. The verify is accomplished with G at V L. Testing Input Output Waveform 10 Figure 8. Output Enable G is the output control and should be used to gate data to the output pins, indepen- dent of device selection. Drawing is not to scaie. If the M27C is to be exposed 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 prevent unintentional erasure.
STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
27C EPROM Technical Data
datashedt Minimum DC voltage on Input or Output is This publication supersedes and replaces all information previously supplied. For the most efficient use of these two control lines, E should 227c512 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.
For a list of available options speed, package, device, please contact your nearest ST Sales Of- etc. The associated transient catasheet peaks can be suppressed by complying with the two line output control and by properly selected decoupling capacitors. Ordering Information Scheme Example: Search the history of over billion web pages on the Internet.
Package Mechanical Data 17 Figure Program Verify A verify read should be performed on the pro- grammed bits to determine that they were correct ly programmed.
A new pattern can then be written to the device by following the programming procedure. LCC Connections 5 Figure 5.
Full text of “IC Datasheet: 27C EPROM Data Sheet”
The M27C is in the pro- g. Dataheet purpose of the bulk capacitor is to overcome the voltage drop caused by the inductive effects of PCB traces. 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. Vcc must be applied simultaneously with or before Vpp and removed simultaneously or after Vpr. A single power supply is required in theread mode.
Designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted parame- ters.