Texas Instruments CD4048BNSR

Overview

CD4048BNSR from Texas Instruments is a CMOS multifunction expandable logic gate IC with eight primary inputs plus one EXPAND input, supporting cascaded 16-input configurations. It operates over 3V–18V supply range, features TTL- and CMOS-compatible inputs, and delivers ±4.2mA output drive at VDD = 15V in 16-pin SOIC (NSR) package for industrial control logic consolidation.

For engineers reviewing the CD4048BNSR datasheet, CD4048BNSR pinout, CD4048BNSR application, or CD4048BNSR equivalent, this device serves as a configurable 8-input universal gate with expandability for custom combinational logic, low-power state-machine encoding, and legacy TTL-to-CMOS interface bridging in space-constrained PCBs.

Technical Context

The CD4048BNSR implements a programmable logic array (PLA)-style function block where input selection, polarity control, and OR/AND/NOR/NAND mode are set via three mode-select inputs (A, B, C). Its EXPAND input enables logical OR-ing of outputs from multiple CD4048B devices without external gates.

It uses standard CMOS silicon-gate process technology, ensuring rail-to-rail output swing, high noise immunity (>50% VDD), and static discharge protection per MIL-STD-883 Class 3B. Input thresholds are fixed at 50% VDD, eliminating hysteresis and enabling deterministic timing in synchronous logic trees.

Key Specifications

Pinout & Package

CD4048BNSR is housed in a 16-pin plastic small-outline (SOIC) package per JEDEC MS-012, designated NSR suffix, with 1.27mm lead pitch, gull-wing leads, and body dimensions 9.9mm × 3.9mm × 1.75mm (L×W×H).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multifunction logic gate applications.

Compared with CD4048BNSR, both alternatives lack programmable logic modes and input expansion-making them unsuitable for applications requiring adaptive gate configuration or cascaded wide-input logic synthesis.

Availability

CD4048BNSR is available at Aetrix Electronics and suitable for industrial control sequencing, legacy system interface bridging, low-power state-machine encoding, and configurable glue logic for microcontrollers requiring stable component supply across long-lifecycle production programs.

Supply support for CD4048BNSR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The CD4048BNSR belongs to TI's legacy CMOS logic family designed for high-noise-immunity, wide-voltage-range glue logic in harsh environments where programmability and expandability reduce component count.

FAQ

What logic functions can the CD4048BNSR implement?

The CD4048BNSR supports eight programmable Boolean functions selected via pins A, B, and C: AND, OR, NAND, NOR, majority, parity, and two custom PLA-style configurations. Each function operates on its eight primary inputs plus the EXPAND input, enabling flexible logic synthesis without external gates. The CD4048BNSR datasheet defines truth tables for all modes, and all functions are fully static CMOS with no internal latching.

How is the EXPAND input used in CD4048BNSR cascading?

The EXPAND input on CD4048BNSR accepts an active-high signal that ORs with the internal gate output, enabling two devices to form a 16-input structure. One CD4048BNSR drives its Y output to the EXPAND pin of a second CD4048BNSR; both are configured identically, and the second's Y becomes the final combined output. Unused EXPAND inputs must be tied to VSS to prevent floating-node noise coupling.

Is CD4048BNSR pin-compatible with other CD4048B package variants?

Yes - CD4048BNSR shares identical pinout and electrical behavior with all CD4048B variants (e.g., CD4048BE, CD4048BM), including PDIP, SOIC, and TSSOP packages. The NSR suffix denotes the 16-pin SOIC package per JEDEC MS-012; mechanical dimensions differ, but signal mapping, timing, and DC specs are fully aligned across suffixes.

What is the maximum capacitive load the CD4048BNSR output can drive?

The CD4048BNSR output is specified to drive up to 50pF while maintaining guaranteed propagation delay (120ns max at VDD = 15V). Driving larger loads increases delay nonlinearly and may cause ringing; for >50pF, add a series resistor (22Ω–47Ω) near the output pin. The CD4048BNSR output stage is not rated for transmission-line driving or bus termination.

Does CD4048BNSR support mixed-voltage operation between inputs and VDD?

No - CD4048BNSR requires all inputs to remain within VSS and VDD. Its inputs are not over-voltage tolerant; applying 5V signals to a CD4048BNSR powered at 3.3V violates absolute maximum ratings and risks latch-up or permanent damage. Level-shifting circuitry is required for mixed-supply interfacing, and the CD4048BNSR itself does not provide voltage translation.