Texas Instruments CD4532BM96

Overview

CD4532BM96 from Texas Instruments is an 8-bit priority encoder IC in a 16-pin SOIC package, operating from −55 °C to +125 °C with supply voltage range 3 V to 18 V. It encodes eight active-low inputs (I₀–I₇) into three active-high binary outputs (Y₀–Y₂), features an enable input (EI), group select (GS), and enable output (EO), and is used in industrial control panels for fault prioritization and digital system interrupt encoding.

For engineers reviewing the CD4532BM96 datasheet, CD4532BM96 pinout, CD4532BM96 application, or CD4532BM96 equivalent, key selection considerations include its CMOS logic family compatibility, wide V_DD tolerance, active-low input architecture, and direct integration into legacy 4000-series timing and control subsystems without level-shifting.

Technical Context

The CD4532BM96 implements combinational priority encoding using static CMOS circuitry, where the highest-order asserted input determines the output code. Its EI input enables/disables encoding, while EO and GS signals support cascading multiple encoders for wider input fields.

It conforms to standard 4000B-series electrical characteristics: input thresholds scale with V_DD, propagation delay is 80 ns typical at 5 V, and output drive capability supports fan-out of ≥10 LS-TTL loads. No internal pull-ups or latching are present - operation is purely combinatorial and asynchronous.

Key Specifications

Pinout & Package

CD4532BM96 is housed in a 16-pin SOIC (D) package per JEDEC MS-012, 7.5 mm body width, 1.75 mm max height, with 1.27 mm pitch and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (UNLIM reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD40147BE and 74HC148PW, the CD4532BM96 uniquely combines extended temperature operation, 3–18 V flexibility, and hardware-supported cascading - making it the sole choice for ruggedized, multi-voltage, scalable priority encoding in industrial and automotive contexts.

Availability

CD4532BM96 is available at Aetrix Electronics and suitable for industrial control panels, automotive diagnostic modules, legacy system interrupt management, and power supply sequencing supervision requiring stable component supply across extended temperature and voltage ranges.

Supply support for CD4532BM96 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, automotive, and aerospace qualification.

The CD4532BM96 belongs to TI's legacy 4000B-series CMOS logic family, designed specifically for robust, low-power, wide-supply digital control in harsh environments where reliability and long-term availability are critical.

FAQ

What is the maximum operating frequency of the CD4532BM96?

The CD4532BM96 is a combinational logic device without a clock, so it has no defined operating frequency. Its performance is governed by propagation delay: 80 ns maximum at V_DD = 5 V, scaling inversely with supply voltage. The CD4532BM96 responds asynchronously to input changes, making it suitable for event-driven encoding rather than periodic sampling.

Does the CD4532BM96 require external pull-up or pull-down resistors on its inputs?

No - the CD4532BM96 inputs are CMOS-compatible and have high impedance, but they do not include internal termination. External pull-up resistors (typically 10 kΩ to V_DD) are recommended on I₀–I₇ when driven by open-collector or mechanical contacts to ensure defined logic states during idle periods. The CD4532BM96 itself does not source or sink current on inputs unless actively driven.

Can the CD4532BM96 be used to encode more than eight inputs?

Yes - the CD4532BM96 supports cascading via its EO (Enable Output) and GS (Group Select) pins. By connecting EO of a lower-priority CD4532BM96 to EI of a higher-priority unit, up to 64 inputs can be encoded across eight devices. This hierarchical configuration is explicitly supported in TI's application notes for the CD4532B family and requires no additional logic components beyond wiring.

Is the CD4532BM96 pin-compatible with older CD4532B variants like CD4532BE or CD4532BF3A?

No - the CD4532BM96 uses a 16-pin SOIC (D) package, while CD4532BE is in 16-pin PDIP and CD4532BF3A is in 16-pin CDIP. Though functionally identical and electrically compatible, their footprints differ significantly. PCB layout must match the SOIC outline (JEDEC MS-012), and thermal/mechanical design must account for the CD4532BM96's surface-mount construction and reflow profile.

What is the purpose of the GS (Group Select) pin on the CD4532BM96?

The GS pin is an active-high output that indicates a valid encoding result: it goes high only when EI is low (enabled) and at least one of I₀–I₇ is low. GS is used to validate output codes before latching or forwarding them to downstream logic. In cascaded systems, GS from each CD4532BM96 stage confirms local encoding integrity - a feature absent in non-priority encoders and essential for fault-diagnostic architectures.