异步，可级联8K / 16K / 32K / 64K的FIFO X9 Asynchronous, Cascadable 8K/16K/32K/64K x9 FIFOs
**Functional Description**
The CY7C460A, CY7C462A, CY7C464A, and CY7C466A are respectively, 8K, 16K, 32K, and 64K words by 9-bit wide first-in first-out 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 over run 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**
**— I****CC****= 60 mA**
**— I****SB ****=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**