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SN74ACT7807FN 数据表(PDF) 1 Page - Texas Instruments |
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SN74ACT7807FN 数据表(HTML) 1 Page - Texas Instruments |
1 / 15 page SN74ACT7807 2048 × 9 CLOCKED FIRST-IN, FIRST-OUT MEMORY SCAS200D – JANUARY 1991 – REVISED APRIL 1998 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Free-Running Read and Write Clocks Can Be Asynchronous or Coincident D Read and Write Operations Synchronized to Independent System Clocks D Input-Ready Flag Synchronized to Write Clock D Output-Ready Flag Synchronized to Read Clock D 2048 Words by 9 Bits D Low-Power Advanced CMOS Technology D Programmable Almost-Full/Almost-Empty Flag D Input-Ready, Output-Ready, and Half-Full Flags D Cascadable in Word Width and/or Word Depth D Fast Access Times of 12 ns With a 50-pF Load D Data Rates up to 67 MHz D 3-State Outputs D Package Options Include 44-Pin Plastic Leaded Chip Carrier (FN) and 64-Pin Thin Quad Flat (PAG, PM) Packages description The SN74ACT7807 is a 2048-word by 9-bit FIFO with high speed and fast access times. It processes data at rates up to 67 MHz and access times of 12 ns in a bit-parallel format. Data outputs are noninverting with respect to the data inputs. Expansion is easily accomplished in both word width and word depth. The write-clock (WRTCLK) and read-clock (RDCLK) inputs should be free running and can be asynchronous or coincident. Data is written to memory on the rising edge of WRTCLK when the write-enable (WRTEN1/DP9, WRTEN2) inputs are high and the input-ready (IR) flag output is high. Data is read from memory on the rising edge of RDCLK when the read-enable (RDEN1, RDEN2) and output-enable (OE) inputs are high and the output-ready (OR) flag output is high. The first word written to memory is clocked through to the output buffer regardless of the levels on RDEN1, RDEN2, and OE. The OR flag indicates that valid data is present on the output buffer. The FIFO can be reset asynchronous to WRTCLK and RDCLK. RESET must be asserted while at least four WRTCLK and four RDCLK cycles occur to clear the synchronizing registers. Resetting the FIFO initializes the IR, OR, and half-full (HF) flags low and the almost-full/almost-empty (AF/AE) flag high. The FIFO must be reset upon power up. The SN74ACT7807 is characterized for operation from 0 °C to 70°C. Copyright © 1998, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. |
类似零件编号 - SN74ACT7807FN |
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类似说明 - SN74ACT7807FN |
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