64 x 4 AsyncFIFO, 5.0V

The IDT72401 are asynchronous high-performance First-ln/First-Out memories organized 64 words by 4 bits. The FlFOs accept 4-bit data at the data input (D0-D3). The stored data stack up on a first-in/first-out basis. A Shift Out (SO) signal causes the data at the next to last word to be shifted to the output while all other data shifts down one location in the stack. The Input Ready (IR) signal acts like a flag to indicate when the input is ready for new data (IR = HIGH) or to signal when the FIFO is full (IR = LOW). The IR signal can also be used to cascade multiple devices together. The Output Ready (OR) signal is a flag to indicate that the output remains valid data (OR = HIGH) or to indicate that the FIFO is empty (OR = LOW). The OR can also be used to cascade multiple devices together. Width expansion is accomplished by logically ANDing the IR and OR signals to form composite signals. Depth expansion is accomplished by tying the data inputs of one device to the data outputs of the previous device. The IR pin of the receiving device is connected to the SO pin of the sending device and the OR pin of the sending device is connected to the Shift In (SI) pin of the receiving device. Reading and writing operations are completely asynchronous allowing the FIFO to be used as a buffer between two digital machines of widely varying operating frequencies. The 45MHz speed makes these FlFOs ideal for highspeed communication and controller applications. Military grade product is manufactured in compliance with the of MIL-STD- 883, Class B.

• First-ln/First-Out Dual-Port memory
• 64 x 4 organization (IDT72401)
• RAM-based FIFO with low falI-through time
• Low-power consumption
  • Active: 175mW (typ.)
• Maximum shift rate - 45MHz
• High data output drive capability
• Asynchronous and simultaneous read and write
• Fully expandable by bit width
• Fully expandable by word depth
• IDT72403 have Output Enable pin to enable output data
• High-speed data communications applications
• High-performance CMOS technology
• Available in CERDIP, plastic DIP and SOIC
• Military product compliant to MlL-STD-883, Class B