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SN74ACT7804 Datasheet(PDF) 1 Page - Texas Instruments |
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SN74ACT7804 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 13 page SN74ACT7804 512 × 18 STROBED FIRST-IN, FIRST-OUT MEMORY SCAS204C – APRIL 1992 – REVISED APRIL 1998 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Member of the Texas Instruments Widebus ™ Family D Load Clock and Unload Clock Can Be Asynchronous or Coincident D 512 Words by 18 Bits D Low-Power Advanced CMOS Technology D Full, Empty, and Half-Full Flags D Programmable Almost-Full/Almost-Empty Flag D Fast Access Times of 15 ns With a 50-pF Load and All Data Outputs Switching Simultaneously D Data Rates up to 50 MHz D 3-State Outputs D Pin-to-Pin Compatible With SN74ACT7806 and SN74ACT7814 D Packaged in Shrink Small-Outline 300-mil Package Using 25-mil Center-to-Center Spacing 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 SN74ACT7804 is a 512-word by 18-bit FIFO for high speed and fast access times. It processes data at rates up to 50 MHz and access times of 15 ns in a bit-parallel format. Data is written into memory on a low-to-high transition at the load-clock (LDCK) input and is read out on a low-to-high transition at the unload-clock (UNCK) input. The memory is full when the number of words clocked in exceeds the number of words clocked out by 512. When the memory is full, LDCK signals have no effect on the data residing in memory. When the memory is empty, UNCK signals have no effect. Status of the FIFO memory is monitored by the full (FULL), empty (EMPTY), half-full (HF), and almost-full/almost-empty (AF/AE) flags. The FULL output is low when the memory is full and high when the memory is not full. The EMPTY output is low when the memory is empty and high when it is not empty. The HF output is high when the FIFO contains 256 or more words. The AF/AE status flag is a programmable flag. The first one or two low-to-high transitions of LDCK after reset are used to program the almost-empty offset value (X) and the almost-full offset value (Y) if program enable (PEN) is low. The AF/AE flag is high when the FIFO contains X or fewer words or (512 – Y) or more words. The AF/AE flag is low when the FIFO contains between (X + 1) and (511 – Y) words. 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. Widebus is a trademark of Texas Instruments Incorporated. 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 26 27 28 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 RESET D17 D16 D15 D14 D13 D12 D11 D10 VCC D9 D8 GND D7 D6 D5 D4 D3 D2 D1 D0 HF PEN AF/AE LDCK NC NC FULL OE Q17 Q16 Q15 GND Q14 VCC Q13 Q12 Q11 Q10 Q9 GND Q8 Q7 Q6 Q5 VCC Q4 Q3 Q2 GND Q1 Q0 UNCK NC NC EMPTY DL PACKAGE (TOP VIEW) NC – No internal connection 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. |
Similar Part No. - SN74ACT7804_06 |
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Similar Description - SN74ACT7804_06 |
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