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SN74ACT2236 Datasheet(PDF) 1 Page - Texas Instruments |
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SN74ACT2236 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 14 page SN74ACT2236 1024 × 9 × 2 ASYNCHRONOUS BIDIRECTIONAL FIRST IN, FIRST OUT MEMORY SCAS149A − APRIL 1990 − REVISED SEPTEMBER 1995 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 D Independent Asynchronous Inputs and Outputs D Low-Power Advanced CMOS Technology D Bidirectional D 1024 Words by 9 Bits Each 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 From 0 to 50 MHz D Fall-Through Times of 23 ns Max D High Output Drive for Direct Bus Interface D 3-State Outputs D Available in 44-Pin PLCC (FN) Package 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 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 SN74ACT2236 is arranged as two 1024 by 9-bit FIFOs for high speed and fast access times. It processes data at rates from 0 to 50 MHz with access times of 25 ns in a bit-parallel format. The SN74ACT2236 consists of bus-transceiver circuits, two 1024 × 9 FIFOs, and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal FIFO memories. Enable OE and DIR 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 1 shows the five fundamental bus-management functions that can be performed with the SN74ACT2236. The SN74ACT2236 is characterized for operation from 0 °C to 70°C. For more information on this device family, see the application report 1K 9 2 Asynchronous FIFOs SN74ACT2235 and SN74ACT2236 in the 1996 High-Performance FIFO Memories Designer’s Handbook, literature number SCAA012A. Copyright 1995, 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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