CY7C4291

CY7C4291 Manufacturer

CY7C4291 Description

CY7C4291 Categories

CY7C4291 Datasheet (PDF)

CY7C4291 Price & Availability

CY7C4291 Features

• High-speed, low-power, first-in first-out (FIFO) memories
• 64K × 9 (CY7C4281)
• 128K × 9 (CY7C4291)
• 0.5-micron CMOS for optimum speed/power
• High-speed 100-MHz operation (10-ns read/write cycle times)
• Low power
  • I_CC= 40 mA
  • I_SB = 2 mA
• Fully asynchronous and simultaneous read and write operation
• Empty, Full, and programmable Almost Empty and Almost Full status flags
• TTL-compatible
• Output Enable (OE) pin
• Independent read and write enable pins
• Center power and ground pins for reduced noise
• Supports free-running 50% duty cycle clock inputs
• Width-Expansion Capability
• 32-pin PLCC
• Pin-compatible density upgrade to CY7C42X1family
• Pin-compatible density upgrade to IDT72201/11/21/31/41/51

CY7C4291 Description

The CY7C4281/91 are high-speed, low-power FIFO memories with clocked read and write interfaces. All are nine bits wide. The CY7C4281/91 are pin-compatible to the CY7C42X1 Synchronous FIFO family. Programmable features include Almost Full/Almost Empty flags. These FIFOs provide solutions for a wide variety of data buffering needs, including high-speed data acquisition, multiprocessor inter­faces, and communications buffering.

These FIFOs have nine-bit input and output ports that are controlled by separate clock and enable signals. The input port is controlled by a free-running clock (WCLK) and two write-enable pins (/WEN1, WEN2//LD).

When /WEN1 is LOW and WEN2//LD is HIGH, data is written into the FIFO on the rising edge of the WCLK signal. While /WEN1, WEN2//LD is held active, data is continually written into the FIFO on each WCLK cycle. The output port is controlled in a similar manner by a free-running read clock (RCLK) and two read enable pins (/REN1, /REN2). In addition, the CY7C4281/91 has an output enable pin (/OE). The read (RCLK) and write (WCLK) clocks may be tied together for single-clock operation or the two clocks may be run indepen­dently for asynchronous read/write applications. Clock frequencies up to 100 MHz are achievable. Depth expansion is possible using one enable input for system control, while the other enable is controlled by expansion logic to direct the flow of data.

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