UPD44164364 - NEC

UPD44164364 (UPD44164084/184/364) 18M-BIT DDRII SRAM 4-WORD BURST OPERATION

The µPD44164084 is a 2,097,152-word by 8-bit, the µPD44164184 is a 1,048,576-word by 18-bit and the µPD44164364 is a 524,288-word by 36-bit synchronous double data rate static RAM fabricated with advanced CMOS technology using full CMOS six-transistor memory cell. The µPD44164084, µPD44164184 and µPD44164364 integrates unique synchronous peripheral circuitr.

Features

• 1.8 ± 0.1 V power supply and HSTL I/O
• DLL circuitry for wide output data valid window and future frequency scaling
• Pipelined double data rate operation
• Common data input/output bus
• Four-tick burst for reduced address frequency
• Two input clocks (K and /K) for precise DDR timing at clock rising edges only
• Two output clocks (C and /C) for precise flight time and clock skew matching-clock and data delivered together to receiving device
• Internally self-timed write control
• Clock-stop capability with µs restart
• User programmable impedance output
• Fast clock cycle time : 4.0 ns (2.