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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This ensures that all deselect- ed memory devices are in their low power standby mode and that the 27d512 pins are only active when data is required from a particular memory device. Read Mode The M27C has two control functions, both of which must be logically active in order to obtain data at the outputs. Testing Input Output Waveform 10 Figure 8.
Exposure to Ab- solute Maximum Rating conditions for extended periods may affect device reliability.
To activate the ES mode, the programming equipment must force The two line control function allows: 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. 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.
Capacitance 10 Table 7. Ice, has three seg- ments that are of interest to the system designer: Full text of ” IC Datasheet: Search the history of over billion web pages on the Internet. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
(Datasheet) 27C pdf – CHMOS EPROM (1-page)
However, Dataseet 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. Drawing is not to scaie. A high level E input inhibits the other M27C51 2s from being pro- grammed. The levels required for the address and data in- puts are TTL. It is recommended that a 0. A new pattern can then be written to the device by following the programming procedure.
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. Package Outline 17 Table DIP Connections Figure 5. A single power supply is required in theread mode. It should be noted that sunlight and some type of fluorescent lamps have wavelengths in the A range.
The associated transient voltage peaks can be satasheet by complying with the two line output control and by properly selected decoupling capacitors. Operating Modes 6 Table 3. Package Outline 19 Table This mode is intended for use by programming equipment to automatically match the device to be programmed with its corresponding programming algorithm.
27C512 – 27C512 512K EPROM Datasheet
Vcc must be applied simultaneously with or before Vpp and removed simultaneously or after Vpp. The recommended erasure procedure for the M27C51 2 is exposure to short wave ultraviolet light which has wavelength A.
Minimum DC voltage on Input or Output is The verify is accomplished with G at V L. All other address lines must be held at Vil during Electronic Signa- ture mode.
The magnitude of the transient current peaks is dependent on the capacitive and inductive loading of the device at the output. Data is introduced by selectively program- ming ‘O’s into the desired bit locations. 27×512 publication supersedes and replaces all information eatasheet supplied. For a list of available options speed, package, device, please contact your nearest ST Sales Of- etc. 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.
Two identifier bytes may then be se- quenced from the device outputs by toggling ad- dress line AO from Vil to Vih. Drawing is not to scaie Table No license is granted by implication or othenwise under any patent or 27512 rights of STMicroelectronics. Vqc is specified to be 6. Ordering Information Scheme Example: Chip Enable E is the power control and should be used for device selection. Although only ‘O’s will be dahasheet, both ‘1 ‘s and ‘O’s can be present in the data word.
(Datasheet) 27C pdf – K-Bit CMOS EPROM (1-page)
Some lamps have a filter on their tubes which should be removed before erasure. Program Inhibit Programming of multiple M27Cs in parallel with different data is also easily accomplished. Vcc must be applied simultaneously with or before Vpp and removed simultaneously or after Vpr. Specifications mentioned in this publication are subject to change without notice.