## Technical Overview: P4C164-25LSMBLF The **P4C164-25LSMBLF** is a high-performance CMOS Static RAM (SRAM) integrated circuit. It is designed for high-speed applications requiring low power consumption and high reliability, often used in military or industrial environments. --- ### 1. Key Technical Specifications The table below summarizes the primary electronic characteristics of the component: | Feature | Specification | | :--- | :--- | | **Memory Capacity** | 64K bits (organized as 8K x 8) | | **Access Time** | 25 nanoseconds (ns) | | **Technology** | CMOS | | **Supply Voltage ($V_{CC}$)** | 5.0V ± 10% | | **Package Type** | LCC (Leadless Chip Carrier) | | **Operating Temp Range** | Military/Industrial (-55°C to +125°C) | | **I/O Type** | TTL Compatible | --- ### 2. Functional Components The internal architecture of the P4C164 consists of several critical stages: 1. **Memory Array:** The 64Kb core is organized into 8,192 words of 8 bits each. 2. **Address Decoders:** These circuits translate the 13 input address lines ($A_0$ to $A_{12}$) to select a specific memory location. 3. **Control Logic:** * **Chip Enable ($\overline{CE}$):** Activates the device; when high, the chip enters a low-power standby mode. * **Write Enable ($\overline{WE}$):** Controls the writing of data to the memory. * **Output Enable ($\overline{OE}$):** Controls the data output buffers to prevent bus contention. 4. **Input/Output Buffers:** These manage the 8-bit bidirectional data bus ($I/O_0$ through $I/O_7$). --- ### 3. Part Number Breakdown Understanding the nomenclature helps identify specific variant features: * **P4C164:** Base part number for the 8K x 8 SRAM family. * **-25:** Indicates the speed grade (25ns access time). * **L:** Refers to the low-power version. * **SM:** Denotes the Leadless Chip Carrier (LCC) surface mount package. * **B:** Refers to MIL-STD-883 class B processing (Reliability screening). * **LF:** Lead-Free (RoHS compliant). --- ### 4. Operational Truth Table | Mode | $\overline{CE}$ | $\overline{WE}$ | $\overline{OE}$ | I/O Pin | Power | | :--- | :--- | :--- | :--- | :--- | :--- | | **Standby** | H | X | X | High Z | Standby ($I_{SB}$) | | **Read** | L | H | L | Data Out | Active ($I_{CC}$) | | **Write** | L | L | X | Data In | Active ($I_{CC}$) | | **Output Disable**| L | H | H | High Z | Active ($I_{CC}$) | ---