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IDT72125L25SO Datasheet(PDF) 2 Page - Integrated Device Technology |
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IDT72125L25SO Datasheet(HTML) 2 Page - Integrated Device Technology |
2 / 12 page 5.35 2 COMMERCIAL TEMPERATURE RANGES IDT72105, IDT72115, IDT72125, 256 x 16, 512 x 16, 1024 x 16 PARALLEL-TO-SERIAL CMOS FIFO PIN CONFIGURATION Symbol Name I/O Description D0–D15 Inputs I Data inputs for 16-bit wide data. RS Reset I When RS is set low, internal READ and WRITE pointers are set to the first location of the RAM array. FF and HF go HIGH. EF and AEF go LOW. A reset is required before an initial WRITE after power-up. W must be high during the RS cycle. Also the First Load pin (FL) is programmed only during Reset. W Write I A write cycle is initiated on the falling edge of WRITE if the Full Flag ( FF) is not set. Data set-up and hold times must be adhered to with respect to the rising edge of WRITE. Data is stored in the RAM array sequentially and independently of any ongoing read operation. SOCP Serial Output Clock I A serial bit read cycle is initiated on the rising edge of SOCP if the Empty Flag ( EF) is not set. In both Depth and Serial Word Width Expansion modes, all of the SOCP pins are tied together. FL/DIR First Load/ Direction I This is a dual purpose input used in the width and depth expansion configurations. The First Load ( FL) function is programmed only during Reset (RS) and a LOW on FL indicates the first device to be loaded with a byte of data. All other devices should be programmed HIGH. The Direction (DIR) pin controls shift direction after Reset and tells the device whether to read out the Least Significant or Most Significant bit first. RSIX Read Serial In Expansion I In the single device configuration, RSIX is set HIGH. In depth expansion or daisy chain expansion, RSIX is connected to RSOX (expansion out) of the previous device. SO Serial Output O Serial data is output on the Serial Output (SO) pin. Data is clocked out LSB or MSB depending on the Direction pin programming. During Expansion the SO pins are tied together. FF Full Flag O When FF goes LOW, the device is full and further WRITE operations are inhibited. When FF is HIGH, the device is not full. EF Empty Flag O When EF goes LOW, the device is empty and further READ operations are inhibited. When EF is HIGH, the device is not empty. HF Half-Full Flag O When HF is LOW, the device is more than half-full. When HF is HIGH, the device is empty to half-full. RSOX/ AEF Read Serial Out Expansion Almost-Empty, Almost-Full Flag O This is a dual purpose output. In the single device configuration (RSIX HIGH), this is an AEF output pin. When AEF is LOW, the device is empty-to-(1/8 full -1) or (7/8 full +1)-to-full. When AEF is HIGH, the device is 1/8-full up to 7/8-full. In the Expansion configuration (RSOX connected to RSIX of the next device) a pulse is sent from RSOX to RSIX to coordinate the width, depth or daisy chain expansion. VCC Power Supply Single power supply of 5V. GND Ground Single ground of 0V. 2665 tbl 01 PIN DESCRIPTIONS DIP/SOIC TOP VIEW 5 6 7 8 9 10 11 12 13 HF D2 D3 D4 GND 1 2 3 4 14 28 27 26 25 24 23 22 21 RSOX/ AEF FL/DIR Vcc SO SOCP 20 19 18 17 16 15 D1 D 0 W D13 D14 D15 P28-2 SO28-3 D12 FF EF RSIX D5 D6 D7 D9 D10 D11 D8 RS 2665 drw 02a |
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