Functional Description
The CY7C460A, CY7C462A, CY7C464A, and CY7C466A are respectively, 8K, 16K, 32K, and 64K words by 9-bit wide first-in first-out (FIFO) memories. Each FIFO memory is organized such that the data is read in the same sequential order that it was written. Full and Empty flags are provided to prevent overrun and underrun. Three additional pins are also provided to facilitate unlimited expansion in width, depth, or both. The depth expansion technique steers the control signals from one device to another by passing tokens.

Features
• High-speed, low-power, first-in first-out (FIFO) memories
• 8K x 9 FIFO (CY7C460A)
• 16K x 9 FIFO (CY7C462A)
• 32K x 9 FIFO (CY7C464A)
• 64K x 9 FIFO (CY7C466A)
• 10-ns access times, 20-ns read/write cycle times
• High-speed 50-MHz read/write independent of depth/width
• Low operating power
    — ICC= 60 mA
    — ISB =8 mA
• Asynchronous read/write
• Empty and Full flags
• Half Full flag (in standalone mode)
• Retransmit (in standalone mode)
• TTL-compatible
• Width and Depth Expansion Capability
• 5V ± 10% supply
• PLCC, LCC, 300-mil and 600-mil DIP packaging
• Three-state outputs
• Pin compatible density upgrade to CY7C42X/46X family
• Pin compatible and functionally equivalent to IDT7205, IDT7206, IDT7207, IDT7208