The TC55V4000ST is a 4,194,304-bit static random access memory (SRAM) organized as 524,288 words by 8 bits. Fabricated using Toshiba's CMOS Silicon gate process technology, this device operates from a single 2.3 to 3.6 V power supply. Advanced circuit technology provides both high speed and low power at an operating current of 3 mA/MHz and a minimum cycle time of 70 ns. It is automatically placed in low-power mode at 0.5 A standby current (at VDD = 3 V, Ta = 25C) when chip enable ( CE ) is asserted high. There are two control inputs. CE is used to select the device and for data retention control, and output enable ( OE ) provides fast memory access. This device is well suited to various microprocessor system applications where high speed, low power and battery backup are required. The TC55V4000ST is available in a normal pinout plastic 32-pin thin-small-outline package (TSOP).