Functional Description

The CY7C419, CY7C420/1, CY7C424/5, CY7C428/9, and CY7C432/3 are first-in first-out (FIFO) memories offered in 600-mil wide and 300-mil wide packages. There are 256, 512, 1,024, 2,048, and 4,096 words respectively by 9 bits wide. 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 in parallel. This eliminates the serial addition of propagation delays, so that throughput is not reduced. Data is steered in a similar manner.

Features

■ Asynchronous first-in first-out (FIFO) buffer memories
■ 256 x 9 (CY7C419)
■ 512 x 9 (CY7C421)
■ 1K x 9 (CY7C425)
■ 2K x 9 (CY7C429)
■ 4K x 9 (CY7C433)
■ Dual-ported RAM cell
■ High speed 50 MHz read and write independent of depth and width
■ Low operating power: ICC = 35 mA
■ Empty and full flags (Half Full flag in standalone)
■ TTL compatible
■ Retransmit in standalone
■ Expandable in width
■ PLCC, 7x7 TQFP, SOJ, 300-mil, and 600-mil DIP
■ Pb-free packages available
■ Pin compatible and functionally equivalent to IDT7200,
IDT7201, IDT7202, IDT7203, IDT7204, AM7200, AM7201,
AM7202, AM7203, and AM7204