The MCM69P737TQ4 is a 4M bit synchronous fast static RAM designed to provide a burstable, high performance, secondary cache for the PowerPCE and other high performance microprocessors. It is organized as 128K words of 36 bits each. This device integrates input registers, an output register, a 2-bit address counter, and high speed SRAM onto a single monolithic circuit for reduced parts count in cache data RAM applications. Synchronous design allows precise cycle control with the use of an external clock (K).
Addresses (SA), data inputs (DQx), and all control signals except output
enable (G) and linear burst order (LBO) are clock (K) controlled through positive-edge-triggered noninverting registers. Bursts can be initiated with either ADSP or ADSC input pins. Subsequent burst addresses can be generated internally by the MCM69P737TQ4 (burst sequence operates in linear or interleaved mode dependent upon the state of LBO) and controlled by the burst address advance (ADV) input pin.
Write cycles are internally self-timed and are initiated by the rising edge of the clock (K) input. This feature eliminates complex off-chip write pulse generation and provides increased timing flexibility for incoming signals.
Synchronous byte write (SBx), synchronous global write (SGW), and synchronous write enable (SW) are provided to allow writes to either individual bytes or
to all bytes. The four bytes are designated as "a", "b", "c", and "d". SBa controls DQa, SBb controls DQb, etc. Individual bytes are written if the selected byte writes SBx are asserted with SW. All bytes are written if either SGW is asserted or if all SBx and SW are asserted.
For read cycles, pipelined SRAMs output data is temporarily stored by an edge-triggered output register and then released to the output buffers at the next
rising edge of clock (K). The MCM69P737TQ4 operates from a 3.3 V core power supply and all outputs
operate on a 2.5 V or 3.3 V power supply. All inputs and outputs are JEDEC standard JESD8-5 compatible.
4 ns Access/7.5 ns Cycle (133 MHz)
3.3 V + 10%, - 5% Core Power Supply, 2.5 V or 3.3 V I/O Supply
ADSP, ADSC, and ADV Burst Control Pins
Selectable Burst Sequencing Order (Linear/Interleaved)
Single-Cycle Deselect Timing
Internally Self-Timed Write Cycle
Byte Write and Global Write Control
PB1 Version 2.0 Compatible
100-Pin TQFP package. Manufactured by Motorola. Sold in a package of 4.