FUNCTIONAL DESCRIPTION
The LH540204 is a FIFO (First-In, First-Out) memory device, based on fully-static CMOS dual-port SRAM technology, capable of storing up to 4096 nine-bit words. It follows the industry-standard architecture and package pinouts for nine-bit asynchronous FIFOs. Each nine-bit LH540204 word may consist of a standard eight-bit byte, together with a parity bit or a block-marking/framing bit.

FEATURES
• Fast Access Times: 20/25/35/50 ns
• Fast-Fall-Through Time Architecture Based on CMOS Dual-Port SRAM Technology
• Input Port and Output Port Have Entirely Independent Timing
• Expandable in Width and Depth
• Full, Half-Full, and Empty Status Flags
• Data Retransmission Capability
• TTL-Compatible I/O
• Pin and Functionally Compatible with Sharp LH5499 and with Am/IDT/MS7204
• Control Signals Assertive-LOW for Noise Immunity
• Packages:
    28-Pin, 300-mil PDIP
    28-Pin, 300-mil SOJ *
    32-Pin PLCC