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CY7C4205-25JC

製品説明
仕様・特性

fax id: 5410 1CY 7C42 25 CY7C4425/4205/4215 CY7C4225/4235/4245 64, 256, 512, 1K, 2K, 4K x 18 Synchronous FIFOs Features • High-speed, low-power, first-in first-out (FIFO) memories • 64 x 18 (CY7C4425) • 256 x 18 (CY7C4205) • 512 x 18 (CY7C4215) • 1K x 18 (CY7C4225) • 2K x 18 (CY7C4235) • 4K x 18 (CY7C4245) • High-speed 100-MHz operation (10 ns read/write cycle time) • Low power (ICC =45 mA) • Fully asynchronous and simultaneous read and write operation • Empty, Full, Half Full, and Programmable Almost Empty/Almost Full status flags • TTL-compatible • Retransmit function • Output Enable (OE) pin • Independent read and write enable pins • Center power and ground for reduced noise • Supports free-running 50% duty cycle clock inputs • Width Expansion Capability • Depth Expansion Capability • Space saving 64-pin 10x10 TQFP, and 14x14 TQFP • 68-pin PLCC Functional Description The CY7C42X5 are high-speed, low-power, first-in first-out (FIFO) memories with clocked read and write interfaces. All are 18 bits wide and are pin/functionally compatible to IDT722x5. The CY7C42X5 can be cascaded to increase FIFO depth. 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 18-bit input and output ports that are controlled by separate clock and enable signals. The input port is Cypress Semiconductor Corporation • controlled by a free-running clock (WCLK) and a write enable pin (WEN). When WEN is asserted, data is written into the FIFO on the rising edge of the WCLK signal. While WEN is held active, data is continually written into the FIFO on each cycle. The output port is controlled in a similar manner by a free-running read clock (RCLK) and a read enable pin (REN). In addition, the CY7C42X5 have an output enable pin (OE). The read and write 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. Retransmit and Synchronous Almost Full/Almost Empty flag features are available on these devices. Depth expansion is possible using the cascade input (WXI, RXI), cascade output (WXO, RXO), and First Load (FL) pins. The WXO and RXO pins are connected to the WXI and RXI pins of the next device, and the WXO and RXO pins of the last device should be connected to the WXI and RXI pins of the first device. The FL pin of the first device is tied to VSS and the FL pin of all the remaining devices should be tied to VCC. The CY7C42X5 provides five status pins. These pins are decoded to determine one of five states: Empty, Almost Empty, Half Full, Almost Full, and Full (see Table 2). The Half Full flag shares the WXO pin. This flag is valid in the standalone and width-expansion configurations. In the depth expansion, this pin provides the expansion out (WXO) information that is used to signal the next FIFO when it will be activated. The Empty and Full flags are synchronous, i.e., they change state relative to either the read clock (RCLK) or the write clock (WCLK). When entering or exiting the Empty states, the flag is updated exclusively by the RCLK. The flag denoting Full states is updated exclusively by WCLK. The synchronous flag architecture guarantees that the flags will remain valid from one clock cycle to the next. As mentioned previously, the Almost Empty/Almost Full flags become synchronous if the VCC/SMODE is tied to VSS. All configurations are fabricated using an advanced 0.65µ N-Well CMOS technology. Input ESD protection is greater than 2001V, and latch-up is prevented by the use of guard rings. 3901 North First Street • San Jose • CA 95134 • 408-943-2600 April 1995 - Revised August 18, 1997

ブランド

CYPRESS

会社名

Cypress Semiconductor

本社国名

U.S.A

事業概要

主力製品は、NOR型フラッシュ・メモリ、F-RAMおよびSRAM Traveoマイクロコントローラ、業界唯一のPSoCソリューション、アナログ回路、PMIC、CapSense capacitive touch-sensingコントローラ、Wireless BLE Bluetooth Low-Energy、そしてUSB connectivityソリューションである。 2015年にスパンション社と合併し、フラッシュメモリ、マイクロコントローラ、ミックスドシグナル製品およびアナログ製品も強化も行っています。

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CY7C4205-25JC 48個 9803 N/A

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