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72125L25TPG8 Datasheet(PDF) 2 Page - Integrated Device Technology |
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72125L25TPG8 Datasheet(HTML) 2 Page - Integrated Device Technology |
2 / 11 page 2 COMMERCIAL TEMPERATURE RANGE IDT72125PARALLEL-TO-SERIALCMOSFIFO 1,024 x 16 PIN CONFIGURATION PIN DESCRIPTIONS PLASTIC THIN DIP (P28, order code: TP) SOIC (SO28, order code: SO) 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 D0 W D13 D14 D15 D12 FF EF RSIX D5 D6 D7 D9 D10 D11 D8 RS 2665 drw 02 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 SerialOutputClock 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 FirstLoad/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 directionafterResetandtellsthedevicewhethertoreadouttheLeastSignificantorMostSignificantbitfirst. RSIX Read Serial In I In the single device configuration, RSIX is set HIGH. In depth expansion or daisy chain expansion, RSIX Expansion is connected to RSOX (expansion out) of the previous device. SO SerialOutput 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, thedeviceisnotfull. EF EmptyFlag 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-FullFlag 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 O This is a dual purpose output. In the single device configuration (RSIX HIGH), this is an AEF output pin. OutExpansion 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 Almost-Empty, is 1/8-full up to 7/8-full. In the Expansion configuration (RSOX connected to RSIX of the next device) a Almost-FullFlag 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. |
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