描述 Description

The R1Q4A7236 is a 2,097,152-word by 36-bit and the R1Q4A7218 is a 4,194,304-word by 18-bit synchronous

double data rate static RAM fabricated with advanced CMOS technology using full CMOS six-transistor

memory cell. It integrates unique synchronous peripheral circuitry and a burst counter. All input registers are

controlled by an input clock pair (K and /K) and are latched on the positive edge of K and /K. These products

are suitable for applications which require synchronous operation, high speed, low voltage, high density and

wide bit configuration. These products are packaged in 165-pin plastic FBGA package.

特性 Features

? Power Supply

? 1.8 V for core (VDD), 1.4 V to VDD for I/O (VDDQ)

? Clock

? Fast clock cycle time for high bandwidth

? Two input clocks (K and /K) for precise DDR timing at clock rising edges only

? Two input clocks for output data (C and /C) to minimize clock skew and flight time mismatches

? Two output echo clocks (CQ and /CQ) simplify data capture in high-speed systems

? Clock-stop capability with μs restart

? I/O

? Common data input/output bus

? Pipelined double data rate operation

? HSTL I/O

? User programmable output impedance

? DLL/PLL circuitry for wide output data valid window and future frequency scaling

? Function

? Two-tick burst for low DDR transaction size

? Internally self-timed write control

? Simple control logic for easy depth expansion

? JTAG 1149.1 compatible test access port

? Package

? 165 FBGA package (15 x 17 x 1.4 mm)