CMOS SyncFIFOTM 256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18, and 4,096 x 18 FEATURES: • • • • • • • • • • • • • • • • • IDT72205LB, IDT72215LB, IDT72225LB, IDT72235LB, IDT72245LB write controls. These FIFOs are applicable for a wide variety of data buffering needs, such as optical disk controllers, Local Area Networks (LANs), and interprocessor communication. These FIFOs have 18-bit input and output ports. The input port is controlled by a free-running clock (WCLK), and an input enable pin (WEN). Data is read into the synchronous FIFO on every clock when WEN is asserted. The output port is controlled by another clock pin (RCLK) and another enable pin (REN). The read clock can be tied to the write clock for single clock operation or the two clocks can run asynchronous of one another for dual-clock operation. An Output Enable pin (OE) is provided on the read port for three-state control of the output. The synchronous FIFOs have two fixed flags, Empty (EF) and Full (FF), and two programmable flags, Almost-Empty (PAE) and Almost-Full (PAF). The offset loading of the programmable flags is controlled by a simple state machine, and is initiated by asserting the Load pin (LD). A Half-Full flag (HF) is available when the FIFO is used in a single device configuration. These devices are depth expandable using a Daisy-Chain technique. The XI and XO pins are used to expand the FIFOs. In depth expansion configuration, First Load (FL) is grounded on the first device and set to HIGH for all other devices in the Daisy Chain. The IDT72205LB/72215LB/72225LB/72235LB/72245LB is fabricated using IDT’s high-speed submicron CMOS technology. 256 x 18-bit organization array (IDT72205LB) 512 x 18-bit organization array (IDT72215LB) 1,024 x 18-bit organization array (IDT72225LB) 2,048 x 18-bit organization array (IDT72235LB) 4,096 x 18-bit organization array (IDT72245LB) 10 ns read/write cycle time Empy and Full flags signal FIFO status Easy expandable in depth and width Asynchronous or coincident read and write clocks Programmable Almost-Empty and Almost-Full flags with default settings Half-Full flag capability Dual-Port zero fall-through time architecture Output enable puts output data bus in high-impedence state High-performance submicron CMOS technology Available in a 64-lead thin quad flatpack (TQFP/STQFP) and plastic leaded chip carrier (PLCC) ° ° Industrial temperature range (–40°C to +85°C) is available Green parts available, see ordering information DESCRIPTION: The IDT72205LB/72215LB/72225LB/72235LB/72245LB are very high speed, low-power First-In, First-Out (FIFO) memories with clocked read and FUNCTIONAL BLOCK DIAGRAM WCLK D0-D17 INPUT REGISTER WRITE CONTROL LOGIC WRITE POINTER ( )/ OFFSET REGISTER • • RAM ARRAY 256 x 18, 512 x 18 1,024 x 18, 2,048 x 18 4,096 x 18 • • FLAG LOGIC /( ) READ POINTER READ CONTROL LOGIC EXPANSION LOGIC OUTPUT REGISTER RESET LOGIC Q0-Q17 IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. SyncFIFO is a trademark of Integrated Device Technology, Inc. COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES RCLK 2766 drw 01 OCTOBER 2006 1 ©2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. DSC-2766/1




Integrated Device Technology, Inc.




通信・コンピュータ・一般向け機器などで使用する低消費電力で高性能なアナログ-デジタル混在半導体部品の設計と製造を行っている。主にOEM製品を扱っている。 RF(無線)、高性能タイミング、メモリーインタフェース、リアルタイムインターコネクト、オプティカルインターコネクト、ワイヤレス給電、スマートセンサーを製造するメーカー


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