BQ4010YMA-150N

The maximum access time for the bq4010 part number with a negative supply tolerance of 10% is 200 ns.

The different pin connections for the bq4010 nonvolatile SRAM are as follows: - A0 – A12: Address inputs - DQ0 – DQ7: Data input/output - CE: Chip enable input - OE: Output enable input - WE: Write enable input - NC: No connect - VCC: +5 volt supply input - VSS: Ground

The control circuitry of the bq4010 ensures data retention in the absence of power by constantly monitoring the single 5V supply for an out-of-tolerance condition. When the V CC falls out of tolerance, the SRAM is unconditionally write-protected to prevent inadvertent write operation. At this time, the integral energy source is switched on to sustain the memory until after V CC returns valid. Additionally, the internal coin cell used by the bq4010 has an extremely long shelf life and provides data retention for more than 10 years in the absence of system power. The integral lithium cell is electrically isolated from the memory until the first application of V CC, after which the isolation is broken, and the energy source is switched on to maintain data integrity.