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SN74ACT2235-20PAG Arkusz danych(PDF) 1 Page - Texas Instruments |
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SN74ACT2235-20PAG Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 18 page SN74ACT2235 1024 × 9 × 2 ASYNCHRONOUS BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY SCAS148F – DECEMBER 1990 – REVISED JUNE 2003 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Independent Asynchronous Inputs and Outputs D Low-Power Advanced CMOS Technology D Bidirectional D Dual 1024 by 9 Bits D Programmable Almost-Full/Almost-Empty Flag D Empty, Full, and Half-Full Flags D Access Times of 25 ns With a 50-pF Load D Data Rates up to 50 MHz D Fall-Through Times of 22 ns Maximum D High Output Drive for Direct Bus Interface D Package Options Include 44-Pin Plastic Leaded Chip Carriers (FN) and 64-Pin Thin Quad Flat (PAG, PM) Packages description A FIFO memory is a storage device that allows data to be written into and read from its array at independent data rates. The SN74ACT2235 is arranged as two 1024 × 9-bit FIFOs for high speed and fast access times. It processes data at rates up to 50 MHz, with access times of 25 ns in a bit-parallel format. The SN74ACT2235 consists of bus-transceiver circuits, two 1024 × 9-bit FIFOs, and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal FIFO memories. Enable (GAB and GBA) inputs are provided to control the transceiver functions. The select-control (SAB and SBA) inputs are provided to select whether real-time or stored data is transferred. The circuitry used for select control eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data. Figure 2 shows the eight fundamental bus-management functions that can be performed with the SN74ACT2235. For more information on this device family, see the application report, 1K × 9 × 2 Asynchronous FIFO SN74ACT2235, literature number SCAA010. The SN74ACT2235 is characterized for operation from 0 °C to 70°C. B2 B3 B4 VCC B5 B6 B7 B8 GND AF/AEB HFB 39 38 37 36 35 34 33 32 31 30 29 18 19 7 8 9 10 11 12 13 14 15 16 17 A3 A4 VCC A5 A6 A7 A8 GND AF/AEA HFA LDCKA 20 21 22 23 FN PACKAGE (TOP VIEW) 54 3 2 1 644 42 41 40 43 24 25 26 27 28 Copyright 2003, 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. |
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