DATASHEET EPROM 2716 PDF

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Table II shows the 3 programming modes. All bits will be at a “1” level output high in this initial state and after any full erasure.

Full text of ” IC Datasheet: Program Verify Mode The programming of the MME may be verified either 1 word at a time during the programming as shown in the timing diagram or by reading all of the words out at the end of the datashret sequence.

After the address and data signals are stable the program pin is pulsed from VI L to VIH with a pulse width between 45 ms datasheet 55 ms. The MME to be erased should be placed 1 inch away from the lamp and no filters should be used. Capacitance Is guaranteed by periodic testing.

The distance from lamp to unit should be maintained at 1 inch. Except for “Operating Temperature Range” they are not meant to imply that the datsaheet should be operated at these limits.

2716 – 2716 16K EPROM Datasheet

In- complete erasure will cause symptoms that can be misleading. These are shown in Table I. The data pins are typically bi-directional in read-write memories. The pin and pin SIMMs are 216 used on these systems. Catalog listing of 1K X 8 indicate a byte addressable 8K memory. The UV content of sunlight may cause a partial erasure of some bits in a relatively short period of time.

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This is done 8 bits a byte at a time. No pins should be left open. Memory Types Two basic types: Any individual address, a sequence of addresses, or addresses chosen at random may be programmed. The large storage capacity of DRAMs make it impractical to add the required number of address pins. The programming sequence is: To prevent damage the device it must not be inserted into a board with power applied.

Refresh also occurs on a normal read, write or during a special refresh cycle. Reprogramming requires up to 20 minutes of high-intensity UV light exposure. Transition times S 20 ns unless noted otherwise. The table of “Electrical Characteristics” provides conditions for actual device operation.

Maintains its state when powered down. The number of data pins is related to the size of the memory location. This refresh is performed by a special circuit in the DRAM which refreshes the entire memory using reads. If more than one are present, then all must be 0 in order to perform a read or write.

IC Datasheet: 2716 EPROM – 1

For example, an 8-bit wide byte-wide memory device has 8 data pins. A new pattern epfom then be written into the device by following the programming procedure. These organize the memory bits wide. Multiple pulses are not needed but will not cause device damage. Memory Chips The number of address pins is related to the number of memory locations.

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DRAMs Pentiums have a bit wide data bus. Common sizes today are 1K to M locations. Used to store setup information, e. When a lamp is changed, the distance is changed, or the lamp is aged, the system should be checked to make certain full erasure is occurring.

An erasure system should be calibrated periodically. For dual control pin devices, it must be hold true that both are not 0 at the same time. This exposure discharges the floating gate to its initial state through induced photo current.

Full text of “IC Datasheet: EPROM – 1”

Program Inhibit Mode The program inhibit mode allows programming several MMES simultaneously with different data for each one by controlling which ones receive the program pulse. MMES may be programmed in parallel with the same data in this mode.

Writing is much slower than a normal RAM. It is recommended that the MME be kept out of direct sunlight. The OE pin enables and disables a set of tristate buffers.

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