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128K x 36 Async, 3.3V/2.5V Dual-Port RAM, Interleaved I/O's
The IDT70T659 is a high-speed 128K x 36 Asynchronous Dual-Port Static RAM. The IDT70T659 is designed to be used as a stand-alone 4608K-bit Dual-Port RAM or as a combination MASTER/SLAVE Dual-Port RAM for 72-bit-or-more word system. Using the IDT MASTER/SLAVE Dual-Port RAM approach in 72-bit or wider memory system applications results in full-speed, error-free operation without the need for additional discrete logic. This device provides two independent ports with separate control, address, and I/O pins that permit independent, asynchronous access for reads or writes to any location in memory. An automatic power down feature controlled by the chip enables (either CE0 or CE1) permit the on-chip circuitry of each port to enter a very low standby power mode. The IDT70T659 has a Rapid Write Mode which allows the designer to perform back-to-back write operations without pulsing the R/W input each cycle. This is especially significant at the 10ns cycle time of the IDT70T659, easing design considerations at these high performance levels. The 70T659 can support an operating voltage of either 3.3V or 2.5V on one or both ports, controlled by the OPT pins. The power supply for the core of the device (VDD) is at 2.5V.
True Dual-Port memory cells which allow simultaneous access of the same memory location