MB8421-90LP

The MB8421-90LP is 2,048 words x 8 bits dual-port high-performance static random access memories(SRAMs) fabricated in CMOS. The SRAMs use asychronous circuits; thus,no external clocks are required.It provides the user with two separately controlled I/O ports with independent addresses, chip select, write enable, output enable, and I/O functions.This arrangement permits independent access to any memory location for either a read or wirte operation-a useful feature for shared data processing applicaitons.

It has many unique features about MB8421-90LP: (1) single +5 V power supply ±10% tolerance; (2) TTL compatible inputs and outputs; (3) three-state outputs with OR-tie capacity; (4) address arbitration function is busy flag; (5) interrupt function for communication between systems,etc.

There are some absolute maximum ratings about MB8421-90LP. (1): output current(Iout) is ±20 mA; (2): power dissipation(PD) is 1.0 W; (3): temperature under bias(Tbias) is -10 to +85; (4): storage temperature(Tstg) is -40 to +125; (5): output voltage on any I/O pin with respect to Vss (Vout) is -0.5 V to Vcc+0.5 V ; (6): input voltage on any pin with respect to Vss(Vin) is -0.5 V to Vcc +0.5 V,etc.