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SN74ACT7802 Datasheet(PDF) 4 Page - Texas Instruments |
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SN74ACT7802 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 15 page ![]() SN74ACT7802 1024 × 18 STROBED FIRST-IN, FIRST-OUT MEMORY SCAS187D – AUGUST 1990 – REVISED APRIL 1998 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 functional block diagram OE D0–D17 UNCK Q0–Q17 AF/AE HF LDCK EMPTY FULL RESET DAF Read Control Write Control Reset Logic Status- Flag Logic Read Pointer Write Pointer Location 1023 Location 2 Location 1 Location 1024 1024 × 18 RAM Terminal Functions TERMINAL I/O DESCRIPTION NAME NO.† I/O DESCRIPTION AF/AE 33 O Almost-full/almost-empty flag. Depth-offset values can be programmed for AF/AE, or the default value of 256 can be used for the almost-empty almost-full offset (X). AF/AE is high when memory contains X or fewer words or (1024 – X) or more words. AF/AE is high after reset. DAF 27 I Define almost-full flag. The high-to-low transition of DAF stores the binary value of data inputs as the AF/AE offset value (X). With DAF held low, a low pulse on RESET defines AF/AE using X. D0–D17 7–15, 17, 19–26 I 18-bit data input port EMPTY 66 O Empty flag. EMPTY is low when the FIFO is empty. A FIFO reset also causes EMPTY to go low. FULL 35 O Full flag. FULL is low when the FIFO is full. A FIFO reset causes FULL to go high. HF 36 O Half-full flag. HF is high when the FIFO memory contains 512 or more words. HF is low after reset. LDCK 29 I Load clock. Data is written to the FIFO on the rising edge of LDCK when FULL is high. OE 2 I Output enable. When OE is low, the data outputs are in the high-impedance state. Q0–Q17 38–39, 41–42, 44, 46–47, 49–50, 52–53, 55–56, 58–59, 61, 63–64 O 18-bit data-output port RESET 1 I Reset. A low level on RESET resets the FIFO and drives AF/AE and FULL high and HF and EMPTY low. UNCK 5 I Unload clock. Data is read from the FIFO on the rising edge of UNCK when EMPTY is high. † Terminal numbers listed are for the FN package. |
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