27256 EPROM DATASHEET PDF

Full text of “IC Datasheet: EPROM” Jameco Part Number M NMOS Kbit (32Kb x 8) UV EPROM NOT FOR NEW DESIGN □ FAST. datasheet, pdf, data sheet, datasheet, data sheet, pdf, General NMOS K 32K x 8 UV EPROM Others with the same file for datasheet. (EPROM). The device is organized as 32K words by 8 bits (32K bytes). Accessing individual bytes from an address transition or from power-up (chip enable pin.

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Search the history of over billion web pages on the Internet. Full text of ” IC Datasheet: It is organized as The transparent lid allows the user to expose the chip to ultraviolet light to erase the bit pattern. A new pattern can then be written to the device by following the pro- gramming procedure.

Except for the rating “Operating Temperature Range”, stresses above those listed in the Table “Absolute Maximum Ratings” may cause permanent damage to the device.

These are stress ratings oniy and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied.

A single 5V power supply is required in the read mode. Chip Enable E is the power control dztasheet should be used for device selection.

Output Enable G is the output control and should be used to gate data to the output pins, inde- pendent of device selection. Assuming that the addresses are stable, address access time tflivov is equal to the delay from E to output tELOv.

Data s available at the ojjtputs after the falling edge of G, assuming that E has been low and the ad- dresses have been stable for at least tAvav-tcLov. Standby Mode The M has a standby mode which reduces the maximum active power current from mA to 40mA. When in the standby mode, the outputs are in a high impedance state, independent of the G input. Two Line Output Control Because EPROMs are usually used in larger mem- ory arrays, this product features a 2 line control function which accommodates the use of multiple memory connection.

The two line control function allows: This ensures that all deselected 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 supply current, Ice, has three segments that are of interest to the system designer: The magnitude of the transient current peaks is dependent on the capacitive and inductive loading of the device at the output.

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The associated transient voltage peaks can be sup- pressed by complying with the two line output control and by properly selected decoupling ca- pacitors. It is recommended that a 1 j. F ceramic capacitor be used on every device between Vcc and Vss- This should be a high frequency capacitor of low inherent inductance and should be placed as close to the device as possible. In addition, a 4. The bulk capacitor should be located near the power supply connection point.

The purpose of the bulk capacitor is to overcome epro, voltage drop caused by the inductive effects of RGB traces.

Data is introduced by selectively programming “Os” into the desired bit locations. Although only “Os” will be programmed, both “1 s” and “Os” can be present in the data word.

eprom datasheet & applicatoin notes – Datasheet Archive

The only way to change a “0” to a “1 ” is by ultraviolet light erasure. The M is in the programming mode when Vpp input is at 1 2. The data to be pro- grammed is applied 8 bits in parallel to the data output pins.

The levels required forthe address and data inputs are TTL. Programming reliability is also ensured as the incremental program margin of each byte is continually monitored to determine when it has been successfully programmed. The Fast Programming Algorithm utilizes two different pulse types: The duration of the initial E pulse s is 1 ms, which will then be followed by a longer over- program pulse of length 3ms by n n is equal to the number of the initial one millisecond pulses applied Table 3.

Vcc must datasheey applied simultaneously with or before Vpp and removed simultaneously or after Vpp. The length of the Over-program Pulse varies from 2. Up to 25 one-millisecond pulses per byte are provided for before the over program pulse is applied. Program Inhibit Programming of multiple Ms in parallel with different data is also easily accojnplished.

27256 – 27256 256K EPROM Datasheet

Except for E, all like inputs including G of the parallel M may be common. A high level E input inhibits the other Ms from being programmed. Program Verify A verify should be performed on the programmed bits to determine that they were correctly pro- grammed.

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When parallel programming several devices which share the common bus, Vpp should be lowered to Vcc 6V and the normal read mode used to exe- cute a program verify. This mode is intended for use by programming equipment for the purpose of automatically matching the device to be programmed with its corresponding programming algorithm.

To activate this mode, the programming equipment must force Two identifier bytes may then be sequenced from datashete device outputs by toggling address line AO from Vil to Vih. All other address lines must be held at Vil during Electronic Signature mode. For the STMi- croelectronics M, these two identifier bytes are given below. It should erpom noted that sunlight and some type of fluorescent lamps have wavelengths in the A range.

Research shows that constant exposure to room level fluorescent lighting could erase a typical M in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight.

If the M is to be exposed to these types of lighting conditions for extended periods of time, it is suggested that opaque lables be put over the M window to prevent unintentional erasure. The recommended datasheef procedure for the M is exposure to short vyave ultraviolet light which has wavelength A. The integrated dose i. The M should be placed within 2.

Some lamps have a filter on their tubes which should be re- moved before erasure. For further information on any aspect of this device, please contact STMicroelectronics Sales Office nearest to you. However, STMicroeiectronics 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. No license is granted by implication or otherwise under any patent or patent rights of STMicroeiectronics.

Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.

STIVIicroelectronics products are not authorized for use as critical components in life support devices or systems without express written datazheet of STMicroeiectronics.

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