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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Drawing is not to scaie Table Two identifier bytes may then be se- quenced from the device outputs by toggling ad- dress line AO from Vil to Vih. A new pattern can then be written to the device by following the programming procedure. Then a sequence of 1 00 is program pulses are ap- plied to each byte until a correct verify occurs. Exposure to Datasheet solute Maximum Rating conditions for extended periods may affect device reliability.
DIP Connections 5 Figure 4. For the most efficient 27c5512 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.
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27C EPROM Datasheet
The recommended erasure procedure for the M27C51 2 is exposure to short wave ultraviolet light which has wavelength A. The M27C should be placed within 2. The levels required for the address and data in- puts are TTL. Search the history of over billion web pages on the Internet. Designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted parame- ters.
Datashfet two line control function allows: Output Enable G is the output control and should be used to gate data to the output pins, indepen- dent of device selection.
Package Outline 17 Table It is recommended that a 0. No license is granted by implication or othenwise under any patent or patent rights of STMicroelectronics.
Vqc is specified to be 6. Testing Input Output Waveform 10 Figure 8. Operating Modes 6 Table 3. Specifications mentioned in this publication are subject to change without notice.
The M27C is in the pro- g. Read Mode The M27C has two control functions, both of which must be logically active in order to obtain data at the outputs. This mode is intended for use 2c512 programming equipment to automatically match the device to be programmed with its corresponding programming algorithm.
(PDF) 27C512 Datasheet download
AC Measurement Conditions 10 Figure 7. Minimum DC voltage on Input or Output is Ice, has three seg- ments that are of interest to the system designer: Datsheet Names 4 Figure 3. The integrated dose i.
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.
Vcc must be applied simultaneously with or before Vpp and removed simultaneously 27d512 after Vpp.
Full text of ” IC Datasheet: Drawing datasehet not to scaie. Chip Enable E is the power control and should be used for device selection. Package Mechanical Data 17 Figure A single power supply is required in theread mode. 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.
Data is introduced by selectively program- ming ‘O’s into the desired bit locations. Vcc must be applied simultaneously with or before Vpp and removed simultaneously or after Vpr.
Ordering Information Scheme Example: LCC Connections 5 Figure 5. The bulk capacitor should be located near xatasheet power supply connection point. For a list of available options speed, package, device, please contact your nearest ST Sales Of- etc. The data to be programmed is applied to 8 bits in parallel to the data output pins. Capacitance 10 Table 7. 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.
27C Datasheet PDF –
Package Outline 19 Table Speed obtained with High Speed AC measurement conditions. The verify is accomplished with G at V L. All other address lines must be held at Vil during Electronic Signa- ture mode.
Some lamps have a filter on their tubes which should be removed before erasure. The associated transient voltage peaks can be suppressed by complying with the two line output control and by properly selected decoupling capacitors. Program Inhibit Programming of multiple M27Cs in parallel with different data is also easily accomplished. The purpose of the bulk capacitor is to overcome the voltage drop caused by the inductive effects of PCB traces.