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SN74ABT7820-30PH 데이터시트(PDF) 2 Page - Texas Instruments |
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SN74ABT7820-30PH 데이터시트(HTML) 2 Page - Texas Instruments |
2 / 18 page SN74ABT7820 512 × 18 × 2 STROBED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY SCAS206D – AUGUST 1991 – REVISED APRIL 1998 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 60 59 58 57 56 55 54 53 52 51 50 48 49 47 46 45 44 43 42 41 40 26 27 28 29 30 31 32 33 34 35 36 37 38 39 80 79 78 77 76 75 74 73 71 70 69 68 67 66 65 64 63 62 61 72 PN PACKAGE (TOP VIEW) AF/AEA HFA FULLA GND A0 A1 VCC A2 A3 GND A4 A5 GND A6 A7 GND A8 A9 VCC A10 AF/AEB HFB FULLB GND B0 B1 VCC B2 B3 GND B4 B5 GND B6 B7 GND B8 B9 VCC B10 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 SN74ABT7820 is arranged as two 512 × 18-bit FIFOs for high speed and fast access times. It processes data at rates up to 67 MHz with access times of 12 ns in a bit-parallel format. The SN74ABT7820 consists of bus-transceiver circuits, two 512 × 18 FIFOs, and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal FIFO memories. Enable inputs (GAB and GBA) control the transceiver functions. The SAB and SBA control inputs 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 illustrates the eight fundamental bus-management functions that can be performed with the SN74ABT7820. The SN74ABT7820 is characterized for operation from 0 °C to 70°C. |
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