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These are shown in Table I. When a lamp datasheeg changed, the distance is changed, or the lamp is aged, the system should be checked to make certain full erasure is occurring.

Datxsheet its state when powered down. Memory Chips Each memory device has at least one control pin. After the address and data signals are stable the program pin is pulsed from VI L to VIH with a pulse width between 45 ddatasheet and 55 ms. It is recommended that the MME be kept out of direct sunlight. Memory Chips The number of address pins is related to the number of memory locations. Except for “Operating Temperature Range” they are not meant to imply that the devices should be operated at these limits.


Refresh also occurs on a normal read, write datashete during a special refresh cycle. The UV content of sunlight may cause a partial erasure of some bits in a relatively short period of time.

An opaque coating paint, tape, label, etc. Catalog listing of 1K X 8 indicate a byte addressable 8K memory. Multiple pulses are not needed but will not cause device damage.

2716 EPROM

For dual control pin devices, it must be hold true that both are not 0 at the same time. The large storage capacity of DRAMs make it impractical to add the required number of address pins.

A new pattern can then be written into the device by following the programming procedure. An erasure system should be calibrated periodically.

More on this later. Each memory device has at least one chip select CS or chip enable CE or select S pin that enables the memory device. The pin and pin SIMMs are not used on these systems. The table of datasheeg Characteristics” provides conditions for actual device operation.

DRAMs Pentiums have a bit wide data bus. Erasable Programmable Read-Only Memory. 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 27116 the programming sequence.

Lamps dqtasheet intensity as they age. There are several forms: Common sizes today are 1K to M locations. Chip Deselect to Output Float. The programming sequence is: To prevent damage the device it must not be inserted into a board with power applied. DRAMs are available in much larger sizes, e. For example, an 8-bit wide byte-wide memory device has 8 data pins. This is done 8 bits a byte at a time. Factory programmed, cannot be changed. Dayasheet Is guaranteed by periodic testing.


Reprogramming requires up to 20 minutes of high-intensity UV light exposure. 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 dattasheet through induced photo current.

IC Datasheet: EPROM – 1 : Free Download, Borrow, and Streaming : Internet Archive

In- complete erasure will cause symptoms that can be misleading. Any or all of the 8 bits associated with an address location may be programmed wFth a single program pulse applied to the chip enable pin. Field programmable but only once. Memory Datasyeet Two basic types: Writing is much slower than a normal RAM.