The MCM64PD32 and MCM64PD64 are high-performance L2 cache modules designed for the Pentium microprocessor. They utilize Motorola's 3.3 V 32K x 32 BurstRAMs and two Motorola 3.3 V 32K x 8 FSRAMs for tag RAM. They feature byte write capability and fast module clock rate.
The Motorola MCM64PD32 (256 K) and MCM64PD64 (512 K) are high‑performance, pipelined BurstRAM L2 cache modules designed for Pentium microprocessors with Intel Triton II chip sets. Both modules use Motorola 3.3 V 32 K × 32 BurstRAMs and two 32 K × 8 FSRAMs for tag RAM, providing burstable cache with byte‑write capability and three‑state outputs.
The 160‑lead card‑edge package includes detailed pin assignments, truth tables for synchronous and asynchronous operation, absolute maximum ratings, recommended operating conditions, and package dimensions. The data sheet also lists electrical characteristics such as supply voltage ranges, input/output voltage levels, leakage currents, and capacitance values.
| Cache size | 256 K (MCM64PD32) / 512 K (MCM64PD64) |
|---|---|
| Package type | 160‑lead card edge module |
| Supply voltage (operating range) | 3.135 V – 3.6 V |
| Input high voltage (VIH) | 2.0 V + 0.3 V |
| Input low voltage (VIL) | -0.5 V |
| Output current per I/O | +20 mA |
| Operating temperature range | 0 °C – +70 °C |
| Input capacitance (MCM64PD32) | 22 pF |
| Maximum power‑supply voltage | -0.5 V to +46 V |
The recommended operating supply voltage is 3.135 V to 3.6 V.
The module uses a 160‑lead card‑edge package.
They are rated for an operating temperature from 0 °C up to +70 °C.
VIH is specified as 2.0 V plus a 0.3 V tolerance.