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Memory Chips Each memory device has at least one control pin. Erasable Programmable Read-Only Memory.

EPROM Datasheet

Table II shows the 3 programming modes. 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 and 55 ms. To prevent damage the device it must not be inserted into a board with power applied. The large storage capacity of DRAMs make it impractical to add the required number of address pins. Factory programmed, cannot be changed. This refresh is performed by a special circuit in the DRAM which refreshes the entire memory using reads.

Programmers, components, and system designs have been erroneously suspected when incom- plete erasure was the basic problem. Maintains its state when powered down. DRAMs Pentiums have a bit wide data bus.

Lamps lose intensity as they age. These organize the memory bits wide.


Direct sunlight any intense light can cause temporary functional fail- ure due to generation of photo current. This exposure discharges the floating gate to its initial state through induced photo current.

Writing is much slower than a normal RAM. The programming sequence is: Field programmable but only once. Catalog listing of 1K X 8 indicate a byte addressable 8K memory.

Chip Deselect to Output Float. The data pins are typically bi-directional in read-write memories. All bits will be at a “1” level output high in this initial state and after any full erasure.

All similar inputs of the MME may be par- alleled. 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 programming sequence.

Except for “Operating Temperature Range” they are not meant to imply that the devices should be operated at these limits. Transition times S 20 ns unless noted otherwise.

2716 – 2716 16K EPROM Datasheet

Common sizes today are 1K to M locations. DRAMs are available in much larger sizes, e. Memory Chips The number of address pins is related to the number of memory locations.

Used to store setup information, e. Any individual address, a sequence of addresses, or addresses chosen at random may be programmed.


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. Typical conditions are for operation at: Instead, the address pins are multiplexed. The erasure time is increased by the square of the distance if the distance is doubled the erasure time goes up by a factor of 4. Each memory device has at least one chip select CS or chip enable CE or select S pin that enables the memory device.

More on this later. An erasure system should be calibrated periodically. All input voltage levels, including the program pulse on chip-enable are TTL compatible. These are shown in Table I. The MME is packaged in a pin dual-in-line package with transparent lid.

Memory Chips ROMs cont: Reprogramming requires up to 20 minutes of high-intensity UV light exposure. A new pattern can then be written into the device by following the programming procedure. Extended expo- sure to room level fluorescent lighting will also cause erasure.