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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The integrated dose i. The levels required for the address and data in- puts are TTL. 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 datasneet be put over the M27C window to prevent unintentional erasure.
DIP Connections 5 Figure 4.
Minimum DC voltage on Input or Output is 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. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. Signal Names 4 Figure 3.
Ordering Information Scheme Example: Although only ‘O’s will be programmed, both ‘1 ‘s and ‘O’s can be present in the data word. Read Mode The M27C has two control functions, both of which must be logically active in order to obtain data at the outputs. Full text of ” IC Datasheet: It is recommended that a 0. Data is introduced by selectively program- ming ‘O’s into the desired bit locations.
Designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted parame- ters. Logic Diagram 4 Table 1.
Search the history of over billion web pages on the Internet. Capacitance 10 Table 7.
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. A new pattern can then be written to the device by following the programming procedure.
Exposure to Ab- solute Maximum Rating conditions for extended periods may affect device reliability. Drawing is not to scaie Table The parameters in the DC and AC Characteristic tables that follow daatasheet de- rived from tests performed under the Measure- ment Conditions summarized in the relevant tables.
Ice, has datashet seg- ments that are of interest to the system designer: Package Outline 19 Table This publication supersedes and replaces all information previously supplied. A high level E input inhibits the other M27C51 2s from being pro- grammed. Specifications mentioned in this publication are subject to change without notice. Then a sequence of 1 00 is program pulses are ap- plied to each byte until a correct verify occurs. LCC Connections 5 Figure 5.
To activate the ES mode, the programming equipment must force It should be noted that sunlight and some type of fluorescent lamps have wavelengths in the A range. Chip Enable E is the power control and should be used for device selection.
(Datasheet) 27C pdf – K-Bit CMOS EPROM (1-page)
No license is granted by implication or adtasheet under any patent or patent rights of STMicroelectronics. Speed obtained with High Speed AC measurement conditions.
Vcc must be applied simultaneously with or before Vpp and removed simultaneously or after Vpp. Package Outline 17 Table 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. Drawing is not to scaie. 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.
(Datasheet) 27C pdf – CHMOS EPROM (1-page)
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. All other address lines must be held at Vil during Electronic Signa- ture mode. The recommended erasure procedure for the M27C51 2 is exposure to short wave ultraviolet light which has wavelength A.
Vqc is specified to be 6. This can be achieved with STMicroelectronics M27C due to several design innovations described datasueet the M27C datasheet to improve programming effi- ciency and to provide adequate margin for reliabil- ity.
27C512 Datasheet PDF
Package Mechanical Data 17 Figure 27d512 Verify A verify read should be performed on the pro- grammed bits to determine that they were correct ly programmed. The data to be programmed is applied to 8 bits in parallel to the data output pins. For a list of available options speed, package, device, please contact your nearest ST Sales Of- etc. AC Measurement Conditions 10 Figure 7. Vcc 227c512 be applied simultaneously with or before Vpp and removed simultaneously or after Vpr.
The purpose of the bulk capacitor is to overcome the voltage drop caused by the inductive effects of PCB traces.
A single power supply is required in theread mode. Output Enable G is the output control and should be used to gate data to the output pins, indepen- dent of device selection.