Texas Instruments CD4048BPW

Overview

CD4048BPW from Texas Instruments is a CMOS multifunction expandable logic gate IC with eight primary inputs, one EXPAND input for cascading, and programmable logic function selection via three mode control lines (A, B, C). It operates over 3–18 V supply range, supports 5 V/10 V/15 V logic levels, and delivers ±4.2 mA output drive at 10 V. It is used in digital system glue logic, bus arbitration, and configurable combinational logic blocks.

For engineers reviewing the CD4048BPW datasheet, CD4048BPW pinout, CD4048BPW application, or CD4048BPW equivalent, this device offers flexible Boolean function synthesis in space-constrained industrial control panels, legacy TTL-to-CMOS interface adaptation, and modular logic expansion where input count scalability matters.

Technical Context

The CD4048BPW implements a single 8-input multifunction gate whose logical operation (OR, NOR, AND, NAND, XOR, XNOR, majority, or programmable sum-of-products) is selected by the A/B/C mode inputs. Its EXPAND input enables hierarchical logic composition-two devices cascade to form a 16-input gate without external gates.

It uses standard CMOS silicon process with buffered outputs, rail-to-rail input voltage tolerance, and inherent noise immunity due to high input impedance (>100 MΩ) and hysteresis-free switching thresholds referenced to VDD/2. Propagation delay is 80 ns typical at 10 V with 50 pF load.

Key Specifications

Pinout & Package

The CD4048BPW is housed in a 16-lead thin shrink small-outline package (TSSOP), JEDEC MO-153 compliant, with 0.65 mm lead pitch and 5.0 mm × 6.4 mm body size. Pin 1 marked by dot; leads are gull-wing, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4048BE and 74HC4048, the CD4048BPW uniquely combines TSSOP packaging for high-density layouts, full 3–18 V operation, and true expandable logic-making it the sole option for scalable, mixed-voltage, surface-mount multifunction gate applications.

Availability

CD4048BPW is available at Aetrix Electronics and suitable for industrial control logic, legacy system interface design, test fixture reconfiguration, and modular digital instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for CD4048BPW 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 ICs with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The CD4048B series belongs to TI's legacy CMOS logic family designed for robust, low-power, wide-supply-voltage digital interfacing and configurable combinational logic in industrial, aerospace, and instrumentation systems.

FAQ

What logic functions does the CD4048BPW support?

The CD4048BPW supports eight programmable logic functions-OR, NOR, AND, NAND, XOR, XNOR, majority, and sum-of-products-selected by the A, B, and C mode control inputs. Each function is defined in the TI datasheet truth table and implemented in hardware without firmware or configuration registers. The CD4048BPW performs these operations deterministically on its eight primary inputs plus EXPAND signal, making it suitable for deterministic real-time logic decisions.

Can the CD4048BPW operate at 3.3 V?

Yes, the CD4048BPW is fully specified down to 3 V supply voltage per the TI datasheet, with guaranteed performance including input thresholds, output drive, and propagation delay. At 3.3 V, output drive reduces to ±1.5 mA, and propagation delay increases to 140 ns max (CL = 50 pF), but all logic functions remain valid. The CD4048BPW thus supports direct integration into modern 3.3 V microcontroller systems without level translation.

How is the EXPAND input used in cascading configurations?

The EXPAND input on the CD4048BPW is active-low and accepts the output (Y) of another CD4048BPW to extend input count. When cascading two devices, the first CD4048BPW's Y drives the second's EXPAND pin, and both share identical A/B/C mode settings. The final output reflects the combined logic of all 16 inputs. Unused EXPAND pins must be tied to VDD-not left floating-to prevent metastability. This behavior is confirmed in Figure 2 of the TI CD4048B datasheet.

Is the NC pin on CD4048BPW safe to ground?

Yes, pin 16 of the CD4048BPW is designated NC (No Connect) and is not bonded internally. TI's mechanical drawings and datasheet confirm no electrical connection exists. Grounding pin 16 is acceptable and may improve mechanical stability during reflow, though leaving it unconnected is also valid. Neither choice affects CD4048BPW functionality, timing, or reliability-TI explicitly states NC pins require no special handling beyond standard SMT practices.

What is the maximum clock or toggle frequency supported by CD4048BPW?

The CD4048BPW is a combinational logic device-not a clocked sequential IC-so it has no clock input or maximum toggle frequency rating. Its usable signal bandwidth is determined by propagation delay: 80 ns typical at 10 V, implying reliable operation up to ~5 MHz for repetitive pattern generation under load. For clean edge transitions, rise/fall times are <100 ns. The CD4048BPW remains functional at lower frequencies indefinitely, making it suitable for both high-speed glue logic and slow-scan industrial monitoring circuits.