27C512 DATASHEET PDF
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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Ice, has three seg- ments that are of interest to the system designer: LCC Connections 5 Figure 5.
Drawing is not to scaie Table For the most efficient use 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.
Read Mode The M27C has two control functions, both of which must be logically active in order to obtain data at the outputs. Package Mechanical Data 17 Figure Datashfet Outline 17 Table Vcc must be applied simultaneously with or before Vpp and removed simultaneously or after Vpp.
This publication supersedes and replaces all information previously supplied. Operating Modes 6 Table 3. 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.
High Speed, see AC Characteristics section for further information. The M27C should be placed dafasheet 2.
The verify is accomplished with G at V L. A high level E input inhibits the other M27C51 2s from being pro- grammed. Signal Names dagasheet Figure 3. The levels required for the address and data in- puts are TTL. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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. A single power supply is required in theread mode. The data to be programmed is applied to 8 bits in parallel to the data output pins.
Exposure to Ab- solute Maximum Rating conditions for extended periods may affect device reliability. To activate the ES mode, the programming equipment must force datassheet No license is granted by implication or othenwise under any patent or patent rights of STMicroelectronics.
Output Enable G is the output control and should be used to gate data to the output pins, indepen- dent of device selection.
The associated transient voltage peaks can be suppressed by complying with the two line output control and by properly selected decoupling datasheeet.
Ordering Information Scheme Example: Two identifier bytes may then be se- quenced from the device outputs by toggling ad- dress line AO from Vil to Vih. Package Outline 19 Table DIP Daatsheet Figure 5. 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.
It should be noted 227c512 sunlight and some type of fluorescent lamps have wavelengths in the A range. It is recommended that a 0. Data is introduced by selectively program- ming ‘O’s into the desired bit locations. This mode is intended for use by programming equipment to automatically match the device to be programmed with its corresponding programming algorithm. Vqc is specified to be 6.
Some lamps have a filter on their tubes which should be removed before erasure. Testing Input Output Waveform 10 Figure 8.
(PDF) 27C512 Datasheet download
Then a sequence of 1 00 is program pulses are ap- plied to each byte until a correct verify occurs. 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 recommended erasure procedure for the M27C51 2 27×512 exposure to short wave ultraviolet light which has wavelength A. Chip Enable E is the power control and should be used for device selection.
AC Measurement Conditions 10 Figure 7. The magnitude of the transient current peaks is dependent on the capacitive and inductive loading of the device at the output. DIP Connections 5 Figure 4. Logic Diagram 4 Table 1. Minimum DC voltage on Dataasheet or Output is 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.
The bulk capacitor should be located near the power supply connection point. Program Inhibit Programming of multiple M27Cs in parallel with different data is also easily accomplished.
27C EPROM Technical Data
Program Verify A verify read should be performed on the pro- grammed bits to determine that they were correct ly programmed. The purpose of the bulk capacitor is to overcome the voltage drop caused by the inductive effects of PCB traces.
Full text of ” IC Dtasheet Capacitance 10 Table 7. For a list of available options speed, package, device, please contact your nearest ST Sales Of- etc.