Texas Instruments CD4532BPW

Overview

CD4532BPW from Texas Instruments is a CMOS 8-bit priority encoder IC in a 16-pin TSSOP package, operating over -55°C to +125°C, with supply voltage range 3 V to 18 V, propagation delay of 80 ns (at 10 V), and TTL/CMOS-compatible inputs. It converts eight active-low data inputs into three active-high binary outputs, used in keyboard encoding and interrupt prioritization circuits.

For engineers reviewing the CD4532BPW datasheet, CD4532BPW pinout, CD4532BPW application, or CD4532BPW equivalent, key selection considerations include its wide V_DD range, low static current (< 100 nA at 10 V), single-supply operation, and compatibility with legacy 4000B-series logic families in space-constrained industrial control panels.

Technical Context

The CD4532BPW implements combinational priority encoding logic where input I₇ has highest priority and I₀ lowest; only the highest-active input determines output Y₂–Y₀. It features an enable input (EI) that disables encoding when high and asserts group signal (GS) low when any input is active.

Designed for direct interface with mechanical switches and open-collector sensors, it includes Schmitt-trigger inputs for noise immunity and supports cascading via GS and EO pins to build larger encoders - e.g., two CD4532BPW devices can form a 16-input priority encoder with hierarchical priority resolution.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, lead-free NiPdAu finish, MSL Level-1, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar priority encoder applications.

Compared with CD4532BM96 and MC14532BDR2G, the CD4532BPW offers the smallest footprint (4.4 × 5.0 mm), fastest propagation (80 ns), and TI's full production support through July 2026 - making it optimal for high-density, time-critical industrial control designs.

Availability

CD4532BPW is available at Aetrix Electronics and suitable for industrial control panels, aerospace avionics upgrades, and embedded HMI systems requiring stable component supply across long-lifecycle programs.

Supply support for CD4532BPW 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 global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and aerospace qualification.

The CD4532BPW belongs to TI's 4000B-series CMOS logic family, designed for robust, low-power digital interfacing in harsh environments where wide voltage range and temperature resilience are critical.

FAQ

What is the maximum propagation delay of the CD4532BPW at 5 V supply?

The CD4532BPW exhibits a maximum propagation delay of 125 ns at V_DD = 5 V, as specified in the Harris Semiconductor datasheet SCHS082C. This value reflects worst-case delay from input transition to stable output under load, and is measured with CL = 50 pF. The CD4532BPW maintains full functionality across its entire 3–18 V range, with timing degrading predictably at lower voltages.

Does the CD4532BPW require external pull-up resistors on its inputs?

No, the CD4532BPW does not require external pull-up resistors on I₀–I₇ inputs. Each input includes an internal weak PMOS pull-up transistor that biases the pin high when left unconnected. External pull-ups are only needed if stronger drive or faster rise time is required - for example, when interfacing with open-collector sensors with high leakage.

Can the CD4532BPW be used in a cascaded configuration with another CD4532BPW?

Yes, the CD4532BPW supports cascading via its GS (Group Signal) and EO (Enable Output) pins. Connect the GS of the lower-priority stage to the EI of the higher-priority stage, and tie EO outputs together with a pull-up resistor. This configuration allows two CD4532BPW devices to encode 16 inputs with strict priority hierarchy - a capability confirmed in the functional description of the CD4532BPW datasheet.

Is the CD4532BPW RoHS compliant and lead-free?

Yes, the CD4532BPW is RoHS compliant and features lead-free NiPdAu terminal finish, as documented in TI's Packaging Information Addendum dated 15-Jul-2026. Its MSL Level-1 rating confirms unlimited floor life at ≤30°C/60% RH, and it meets JEDEC MO-153 standards for TSSOP packaging.

What is the function of the GS pin on the CD4532BPW?

The GS (Group Signal) pin on the CD4532BPW is an active-low output that goes low whenever any of the I₀–I₇ inputs is asserted. It serves as a fast, hardware-level "any-input-active" flag - commonly used to trigger microcontroller interrupts or enable downstream logic. When EI is high, GS is forced high regardless of input states, ensuring clean disable behavior in the CD4532BPW.