SAA4955TJ

INTEGRATED CIRCUITS DATA SHEET SAA4955TJ 2.9-Mbit field memory Product specification Supersedes data of 1997 Sep 25 File under Integrated Circuits, IC02 1999 Apr 29 Philips Semiconductors Product specification 2.9-Mbit field memory FEATURES 2949264-bit field memory 245772 × 12-bit organization 3.3 V power supply Inputs fully TTL compatible when using an extra 5 V power supply High speed read and write operations FIFO operations: – full word continuous read and write – independent read and write pointers (asynchronous read and write access) – resettable read and write pointers Optional random access by block function (40 words per block) enabled during pointer reset operation Quasi static (internal self-refresh and clocking pauses of infinite length) Write mask function Cascade operation possible 16 Mbit CMOS DRAM process technology 40-pin SOJ Package. GENERAL DESCRIPTION The SAA4955TJ is a 2949264-bit field memory designed for advanced TV applications such as 100/120 Hz TV, QUICK REFERENCE DATA SYMBOL Tcy(SWCK) Tcy(SRCK) tACC VDD(P) IDD(tot) PARAMETER WRITE cycle time (SWCK) READ cycle time (SRCK) READ access time after SRCK supply voltage (pins 20 and 21) total supply current (IDD(tot) = IDD + IDD(O) + IDD(P)) minimum read/write cycle; outputs open CONDITIONS see Fig.3 see Fig.10 see Fig.10 MIN. 26 26 − 3.0 3.0 − SAA4955TJ PALplus, PIP and 3D comb filter. The maximum storage depth is 245772 words × 12 bits. A FIFO operation with full word continuou...