Features: ` 256 x 9-bit organization IDT72V201
` 512 x 9-bit organization IDT72V211
` 1,024 x 9-bit organization IDT72V221
` 2,048 x 9-bit organization IDT72V231
` 4,096 x 9-bit organization IDT72V241
` 8,192 x 9-bit organization IDT72V251
` 10 ns read/write cycle time
` 5V input tolerant
` Read and Write clocks can be independent
` Dual-Ported zero fall-through time architecture
` Empty and Full Flags signal FIFO status
` Programmable Almost-Empty and Almost-Full flags can be set to any depth
` Programmable Almost-Empty and Almost-Full flags default to Empty+7, and Full-7, respectively
` Output Enable puts output data bus in high-impedance state
` Advanced submicron CMOS technology
` Available in 32-pin plastic leaded chip carrier (PLCC) and 32-pin plastic Thin Quad FlatPack (TQFP)
` Industrial temperature range (40°C to +85°C) is availablePinout
Specifications
|
Symbol |
Rating |
Commercial &Industrial |
Unit |
|
VTERM(2) |
Terminal Voltage with Respect to GND |
0.5 to +5 |
V |
|
TSTG |
Storage Temperature |
-55 to +125 |
oC |
|
IOUT |
DC Output Current |
-55 to +50 |
mA |
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to
the device. This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operational sections of the specification i s not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
2. VCC terminal only.DescriptionThe IDT72V251 SyncFIFOs™ are very high-speed, low-power First-In, First-Out (FIFO) memories with clocked read and write controls. The architecture, functional operation and pin assignments are identical to those of the IDT72201/72211/72221/72231/ 72241/72251, but operate at a power supply voltage (Vcc) between 3.0V and 3.6V. These devices have a 256, 512, 1,024, 2,048, 4,096 and 8,192 x 9-bit memory array, respectively. These FIFOs are applicable for a wide variety of data buffering needs such as graphics, local area networks and interprocessor communication.
These FIFOs of the IDT72V251 have 9-bit input and output ports. The input port is controlled by a free-running clock (WCLK), and two Write Enable pins (WEN1, WEN2). Data is written into the Synchronous FIFO on every rising clock edge when the Write Enable pins are asserted. The output port is controlled by another clock pin (RCLK) and two Read Enable pins (REN1, REN2). The Read Clock can be tied to the Write Clock for single clock operation or the two clocks can run asynchronous of one another for dualclock operation. An Output Enable pin (OE) is provided on the read port for three-state control of the output.
The Synchronous FIFOs of the IDT72V251 have two fixed flags, Empty (EF) and Full (FF). Two programmable flags, Almost-Empty (PAE) and Almost-Full (PAF), are provided for improved system control. The programmable flags default to Empty+7 and Full-7 for PAE and PAF, respectively. The programmable flag offset loading is controlled by a simple state machine and is initiated by asserting the Load pin (LD).
These FIFOs of the IDT72V251 are fabricated using IDT's high-speed submicron CMOS technology.
IDT72V251 Data Sheet
