QS7203

The QS7203 is a kind of 2K*9 FIFO. The device uses a dual-port RAM-based architecture and has independent read and write pointers. This allows high speed with zero fall-through time. The read and write pointers are incremented on the rising edges of the read and write lines. The flag circuitry is based on a patented high-speed design, giving precise half-full, full and empty conditions. These flags also prevent the FIFP from being written into when full or being read from when empty. The FIFO is easily cascadable to any depth and expandable to any width without any speed penalty. Retransmit resets the read pointer to memory location zero and is useful for data communications, digital filtering, and video line-doubling applications.

There are some features of QS7203 as follows: (1)10-ns flag and data access times; (2)fully asychronous read and write; (3)zero fall-through time; (4)expandable in depth with no speed loss; (5)TTL compatible input and output levels; (6)low power with industry standard pinouts; (7)retransmit capability; (8)dual-port RAM-based cell technology; (9)available in PDIP, SOJ, SOIC and PLCC.

What comes next is about the absolute maximum ratings of QS7203: (1)supply voltage to ground: -0.5 to +7.0 V; (2)DC output voltage, VOUT: -0.5 to VCC+0.5 V; (3)DC output voltage, VIN: -0.5 to VCC+0.5 V; (4)AC input voltage (pulse width20 ns): -3.0 V; (5)DC input diode current with VIN<0: -20 mA; (6)DC output current with VIN>VCC: 20 mA; (7)DC output diode current with VOUT<0: -50 mA; (8)DC output current with VOUT>VCC: 50 mA; (9)DC output current max sink current/pin: +70 mA; (10)DC output current max source current/pin: -30 mA; (11)total DC ground current: NxIOL+MxICC mA; (12)total DC VCC power supply current: NxIOH+MxICC mA (N=number of outputs, M=number of inputs); (13)TSTG, storage temperature: -65 to +150.