IDT71T75902

NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
2. VDD terminals only.
3. VDDQ terminals only.
4. Input terminals only.
5. I/O terminals only.
6. This is a steady-state DC parameter that applies after the power supply has reached its nominal operating value. Power sequencing is not necessary; however, the voltage on any input or I/O pin cannot exceed VDDQ during power supply ramp up.
7. TA is the "instant on" case temperature.

The IDT71T75902 are 2.5V high-speed 18,874,368-bit (18 Megabit) synchronous SRAMs organized as 512K x 36 /1M x 18. They are designed to eliminate dead bus cycles when turning the bus around between reads and writes, or writes and reads. Thus they have been given the name ZBTTM, or Zero Bus Turnaround.

Address and control signals are applied to the SRAM during one clock cycle, and on the next clock cycle the associated data cycle occurs, be it read or write.

The IDT71T75902 contain address, data-in and control signal registers. The outputs are flow-through (no output data register). Output enable is the only asynchronous signal and can be used to disable the outputs at any given time.

A Clock Enable (CEN) pin allows operation of the IDT71T75902 to be suspended as long as necessary. All synchronous inputs are ignored when CEN is high and the internal device registers will hold their previous values.

There are three chip enable pins (CE1, CE2, CE2) of the IDT71T75902 that allow the user to deselect the device when desired. If any one of these three is not asserted when ADV/LD is low, no new memory operation can be initiated. However, any pending data transfers (reads or writes) will be completed. The data bus will tri-state one cycle after the chip is deselected or a write is initiated.

The IDT71T75902 have an on-chip burst counter. In the burst mode, the IDT71T75902 can provide four cycles of data for a single address presented to the SRAM. The order of the burst sequence is defined by the LBO input pin. TheLBO pin selects between linear and interleaved burst sequence. The ADV/LD signal is used to load a new external address (ADV/LD = LOW) or increment the internal burst counter (ADV/LD = HIGH).

The IDT71T75902 SRAMs utilize IDT's high-performancev CMOS process, and are packaged in a JEDEC Standard 14mm x 20mm100-pin plastic thin quad flatpack (TQFP) as well as a 119 ball grid arrayv(BGA).