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72V271LA10TFGI Datasheet(PDF) 2 Page - Integrated Device Technology |
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72V271LA10TFGI Datasheet(HTML) 2 Page - Integrated Device Technology |
2 / 27 page COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT72V261LA/72V271LA 3.3 VOLT CMOS SuperSync FIFO™ 16,384 x 9 and 32,768 x 9 2 PIN CONFIGURATIONS TQFP (PN64, ORDER CODE: PF) STQFP (PP64, ORDER CODE: TF) TOP VIEW DESCRIPTION (CONTINUED) PIN 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 WEN SEN DC(1) VCC VCC GND(2) GND(2) GND(2) GND(2) GND(2) GND(2) GND(2) GND(2) GND(2) D8 D7 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 DNC(3) DNC(3) GND DNC(3) DNC(3) VCC DNC(3) DNC(3) DNC(3) GND DNC(3) DNC(3) Q8 Q7 Q6 GND 4673 drw 02 write controls. These FIFOs offer numerous improvements over previous SuperSync FIFOs, including the following: • The limitation of the frequency of one clock input with respect to the other has been removed. The Frequency Select pin (FS) has been removed, thus it is no longer necessary to select which of the two clock inputs, RCLK or WCLK, is running at the higher frequency. • The period required by the retransmit operation is now fixed and short. • The first word data latency period, from the time the first word is written to an empty FIFO to the time it can be read, is now fixed and short. (The variable clock cycle counting delay associated with the latency period found on previous SuperSync devices has been eliminated on this SuperSync family.) SuperSync FIFOs are particularly appropriate for network, video, tele- communications, data communications and other applications that need to buffer large amounts of data. The input port is controlled by a Write Clock (WCLK) input and a Write Enable (WEN) input. Data is written into the FIFO on every rising edge of WCLK when WEN is asserted. The output port is controlled by a Read Clock (RCLK) input and Read Enable (REN) input. Data is read from the FIFO on every rising edge of RCLK when REN is asserted. An Output Enable (OE) input is provided for three-state control of the outputs. The frequencies of both the RCLK and the WCLK signals may vary from 0 to fMAX with complete independence. There are no restrictions on the frequency of one clock input with respect to the other. NOTES: 1. DC = Don’t Care. Must be tied to GND or VCC, cannot be left open. 2. This pin may either be tied to ground or left open. 3. DNC = Do Not Connect. |
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