The part number **898-5-R220** typically refers to a **Thick Film Resistor Network** manufactured by companies like BI Technologies (now part of TT Electronics). ### 1. General Specifications This component is designed to save space on a Printed Circuit Board (PCB) by grouping multiple resistors into a single package. | Feature | Specification | | :--- | :--- | | **Part Series** | 898 Series | | **Package Type** | Dual-In-Line Package (DIP) | | **Number of Pins** | 14 Pins or 16 Pins (Standard 898 style) | | **Resistance Value** | 22 Ohms ($22 \Omega$) | | **Tolerance** | Typically $\pm 2\%$ | | **Circuit Configuration** | Dual Terminator (5) | --- ### 2. Breakdown of the Part Number To understand the specific electronics of this part, we can decode the suffix: * **898**: The series identifier for a Molded DIP Resistor Network. * **-5**: This indicates the **Internal Circuit Configuration**. * The "5" configuration is a **Dual Terminator** circuit. It contains pairs of resistors ($R1$ and $R2$) connected in series between the voltage supply ($V_{cc}$) and Ground ($GND$), with the junction point connected to an output pin. * **R220**: The resistance code. * **R** acts as a decimal point for values under 100 ohms, or represents the base unit. * In this context, it represents **22 Ohms**. --- ### 3. Internal Circuit: Dual Terminator (Config 5) The "5" configuration is specifically used for line termination in high-speed digital circuits (like TTL or ECL logic) to prevent signal reflection. ```text Pin 1 (Vcc) ----[ R1 ]----+---- Pin 2 (Output) | [ R2 ] | Pin 14 (GND) -------------+ ``` *Note: This pattern repeats across the pins of the chip.* --- ### 4. Common Applications * **Bus Termination:** Used at the end of data buses to match impedance. * **Pull-up / Pull-down:** Providing defined logic levels for digital inputs. * **Pulse Squaring:** Improving the shape of digital pulses. ---