IDT70261

The IDT70261 is a high-speed 16K x 16 dual-port static RAM.The IDT70261 is designed to be used as a stand-alone dual-port RAM or as acombination MASTER/SLAVE DuaL-Port RAM for32-bit-or-moreword systems. Using the IDT MASTER/SLAVE Dual-Port RAM approach in 32-bitorwider memory system applications results in full-speed, error-free operation withoutthe need foradditional discrete logic.

The IDT70261 has the following features including:(1)busy and interrupt flags; (2)on-chip port arbitration logic; (3)full on-chip hardware support of semaphore signaling between ports; (4)fully asynchronous operation from either port; (5)TTL-compatible, single 5V (±10%) power supply; (6)available in 100-pin thin quad flatpack; (7)industrial temperature range (-40 to +85) is available for selected speeds.Software handshaking between processors offers the maximum in system flexibility by permitting shared resourcesto be allocated in varying configurations. The IDT70261 does not use its semaphore flags to control any resources through hardware, thus allowing the system designertotal flexibility in system architecture.

The absolute maximum ratings of the IDT70261 are:(1)temperature under bias:-55 to 125; (2)storage temperature range:-55 to 125; (3)terminal voltage with respect to GND:-0.5 to 7.0V; (4)DC output current:50mA.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.The IDT70261 is an extremely fast Dual-Port 16K x 16 CMOS static RAM with an additional 8 address locations dedicatedto binary semaphore flags.Theseflags alloweither processoron the left or right side of the dual-port RAM to claim a privilege overthe other processorforfunctions defined by the system designer's software. As an example, the semaphore can be used by one processorto inhibitthe otherfrom accessing a portion of the dual-port RAM or any other shared resource.