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SN74ALVC7804 Datasheet(PDF) 1 Page - Texas Instruments |
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SN74ALVC7804 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 13 page SN74ALVC7804 512 × 18 FIRST-IN, FIRST-OUT MEMORY SCAS432 – JANUARY 1995 Copyright © 1995, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • Operates at 3-V to 3.6-V V CC • Load Clock and Unload Clock Can Be Asynchronous or Coincident • Low-Power Advanced CMOS Technology • Full, Empty, and Half-Full Flags • Programmable Almost-Full/Almost-Empty Flag • Fast Access Times of 18 ns With a 50-pF Load and All Data Outputs Switching Simultaneously • Data Rates From 0 to 40 MHz • 3-State Outputs • Pin Compatible With SN74ACT7804 • Packaged in Shrink Small-Outline 300-mil Package (DL) 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 SN74ALVC7804 is an 18-bit FIFO with high speed and fast access times. Data is processed at rates up to 40 MHz with access times of 18 ns in a bit-parallel format. The SN74ALVC7804 is designed for 3-V to 3.6-V VCC operation. Data is written into memory on a low-to-high transition of the load clock (LDCK) and is read out on a low-to-high transition of the unload clock (UNCK). 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 has no effect on the data residing in memory. When the memory is empty, UNCK has 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 whenever the FIFO contains 256 or more words and is low when it contains 255 or less 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 less words or (512 minus Y) or more words. The AF/AE flag is low when the FIFO contains between (X plus 1) and (511 minus Y) words. A low level on the reset (RESET) resets the internal stack pointers and sets FULL high, AF/AE high, HF low, and EMPTY low. The Q outputs are not reset to any specific logic level. The FIFO must be reset upon power up. The first word loaded into empty memory causes EMPTY to go high and the data to appear on the Q outputs. The data outputs are in the high-impedance state when the output-enable (OE) is high. 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. 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) |
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