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Texas Instruments CD4532BEG4
- Part No.:
- CD4532BEG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD4532BEG4.pdf
- Description:
- IC PRIORITY ENCOD 1 X 8:3 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,095
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Product details
Overview
CD4532BEG4 from Texas Instruments is an 8-bit priority encoder IC in a 16-lead plastic dual-in-line package (PDIP-N), operating from −55°C to +125°C, with supply voltage range 3 V to 18 V, propagation delay of 120 ns (typ.) at 5 V, and TTL/CMOS-compatible outputs. It converts eight active-low input lines into three-bit binary-coded output, used in keyboard encoding and interrupt prioritization circuits.
For engineers reviewing the CD4532BEG4 datasheet, CD4532BEG4 pinout, CD4532BEG4 application, or CD4532BEG4 equivalent, key selection considerations include its wide VDD range, high noise immunity, direct compatibility with legacy TTL logic, and availability in through-hole PDIP for prototyping and industrial control systems.
Technical Context
The CD4532BEG4 implements combinational priority encoding logic where the highest-order active-low input (I0–I7) determines the 3-bit binary output (Y0–Y2). It features an enable input (EI) that disables encoding when high and asserts group select (GS) low only when any input is active.
Its internal structure uses CMOS transmission gates and inverters, delivering rail-to-rail output swing, static operation down to DC, and immunity to latch-up under normal conditions. Input thresholds are referenced to VDD/2, ensuring robust operation across the full supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 8-input to 3-bit priority encoder with enable and group-select outputs |
| Supply Voltage Range | 3 V to 18 V - supports mixed-voltage system interfacing and battery-powered operation |
| Propagation Delay | 120 ns (typ.) at VDD = 5 V - enables use in medium-speed digital control logic |
| Operating Temperature | −55°C to +125°C - qualified for extended industrial and aerospace environments |
| Input Logic Level | Active-low inputs with VIL ≤ 0.5×VDD, VIH ≥ 0.5×VDD - ensures reliable noise margin across supply range |
| Output Drive | CMOS push-pull outputs capable of ±4.2 mA at VDD = 15 V - directly drives multiple TTL or CMOS loads |
Pinout & Package
CD4532BEG4 is supplied in a 16-lead plastic dual-in-line package (PDIP-N), 19.1 mm × 6.6 mm body size, 2.54 mm lead pitch, through-hole mounting compatible with standard 0.1″ grid PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input I0–I7 | Active-low priority inputs; I0 is lowest priority, I7 is highest priority |
| 9 | VSS | Ground reference terminal for all internal circuitry and output drivers |
| 10 | Y2 | MSB of 3-bit binary output code representing highest active input |
| 11 | Y1 | Intermediate bit of encoded output |
| 12 | Y0 | LSB of encoded output |
| 13 | GS | Group select output: low when any input is active, high otherwise |
| 14 | EO | Enable output: low when encoder is enabled and no input is active |
| 15 | EI | Enable input: high disables encoding and forces GS high, Y0–2 undefined |
| 16 | VDD | Positive supply terminal; powers all internal logic and output stages |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply voltage range | 3 V to 18 V operation eliminates need for level-shifting in multi-rail systems |
| Priority resolution logic | Deterministic encoding resolves simultaneous inputs by selecting highest-priority active line |
| Complementary status outputs | GS and EO signals provide unambiguous system-level readiness and idle-state detection |
| High noise immunity | CMOS input thresholds and hysteresis-free design ensure stable operation in electrically noisy environments |
| Through-hole PDIP packaging | Facilitates manual assembly, breadboarding, and long-term reliability in vibration-prone industrial enclosures |
Applications
| Keyboard Interface | Interrupt Controller |
|---|---|
|
Use Scenario: Matrix keyboard scanning in embedded HMI panels where up to eight keys share row/column lines. IC Role / Device Role / Timing Role: Priority encoder compresses eight key-press signals into three data lines for microcontroller GPIO input. Use Value: Reduces required MCU input pins from eight to three while preserving key precedence for simultaneous presses. |
Use Scenario: Prioritizing hardware interrupt requests from multiple peripheral modules in a real-time control system. IC Role / Device Role / Timing Role: Encodes active interrupt lines into binary address bits routed to CPU interrupt vector decoder. Use Value: Enables deterministic interrupt servicing order without software polling overhead or latency variability. |
| Industrial Control Panel | Legacy System Upgrade |
|
Use Scenario: Fault signal aggregation from eight sensor channels in PLC backplane modules. IC Role / Device Role / Timing Role: Converts discrete fault flags into compact status word for diagnostic bus interface. Use Value: Simplifies wiring harness and reduces connector pin count while maintaining fault hierarchy visibility. |
Use Scenario: Replacing obsolete TTL 74LS148 encoders in maintenance-replacement scenarios. IC Role / Device Role / Timing Role: Drop-in functional replacement with identical pinout, logic behavior, and timing compatibility. Use Value: Eliminates redesign effort and preserves existing PCB layout and firmware logic during component obsolescence mitigation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar priority encoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4532BM96 | SOIC-16 package, surface-mount, MSL Level-1, same electrical specs and pinout | Requires reflow assembly; suited for high-density automated production, not hand-soldering | Select CD4532BM96 for volume SMT manufacturing; CD4532BEG4 remains optimal for through-hole prototyping and repair. |
| 74HC148 | 3.3 V/5 V only, faster propagation (18 ns typ.), active-high inputs, different pinout and truth table | Not pin-compatible; requires PCB redesign and logic inversion in firmware or external gates | Choose 74HC148 only when speed and low-voltage operation outweigh compatibility constraints. |
Compared with CD4532BM96 and 74HC148, the CD4532BEG4 provides unique value in legacy-compatible through-hole deployment, ultra-wide supply flexibility, and seamless drop-in replacement for aging 4000-series designs without layout or firmware changes.
Availability
CD4532BEG4 is available at Aetrix Electronics and suitable for industrial control panels, legacy system upgrades, and embedded HMI interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD4532BEG4 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 ICs with broad industrial, automotive, and aerospace qualification.
The CD4532BEG4 belongs to TI's CD4000B logic family-designed for high-noise-immunity, wide-supply digital control in harsh environments where reliability and longevity are critical.
FAQ
What is the maximum supply voltage rating for CD4532BEG4?
The CD4532BEG4 is rated for operation up to 18 V DC on VDD. Exceeding this voltage risks permanent damage to internal oxide layers. At 18 V, propagation delay improves to ~85 ns (typ.), and output drive strength increases to ±6.8 mA, supporting heavier capacitive loads in high-noise settings.
Is CD4532BEG4 pin-compatible with the 74LS148 TTL encoder?
No, CD4532BEG4 is not pin-compatible with 74LS148. While both perform 8-to-3 priority encoding, CD4532BEG4 uses active-low inputs with EI/EO/GS signaling on pins 15/14/13, whereas 74LS148 places EI on pin 5 and has different output labeling and pin assignments. Direct substitution requires PCB modification.
Does CD4532BEG4 require external pull-up resistors on its outputs?
No, CD4532BEG4 does not require external pull-ups. Its CMOS push-pull outputs actively drive both logic high and low states. Outputs Y0–Y2, GS, and EO are fully buffered and capable of sourcing/sinking ≥4 mA at VDD = 15 V, eliminating need for passive termination in standard interfacing.
What is the function of the EO (Enable Output) pin on CD4532BEG4?
The EO pin (pin 14) on CD4532BEG4 goes low only when EI is low (encoder enabled) and all inputs I0–I7 are high (no active request). It serves as a "no-input-active" flag, enabling cascading of multiple CD4532BEG4 devices or triggering idle-state actions in host controllers without additional logic.
Can CD4532BEG4 operate reliably at −55°C?
Yes, CD4532BEG4 is fully specified and tested for operation from −55°C to +125°C. Its CMOS process and hermetic-grade packaging ensure stable propagation delay, input threshold symmetry, and output drive capability across this full military-grade temperature range, making it suitable for aerospace and outdoor industrial deployments.
CD4532BEG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Type:
- Priority Encoder
- Circuit:
- 1 x 8:3
- Independent Circuits:
- 1
- Current - Output High, Low:
- 6.8mA, 6.8mA
- Voltage Supply Source:
- Dual Supply
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD4532BEG4 FAQ
1.How can I place an order for CD4532BEG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4532BEG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD4532BEG4 reliable?
The price and inventory of CD4532BEG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4532BEG4 is usually 5 days.
3.What payment methods are accepted for CD4532BEG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4532BEG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4532BEG4?
CD4532BEG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4532BEG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD4532BEG4?
For technical support, including CD4532BEG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4532BEG4 requirements.
6.How does Aetrix verify that CD4532BEG4 is sourced from the original manufacturer or authorized distributors?
All CD4532BEG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD4532BEG4 meets industry standards.
7.What is the process for return or replacement of CD4532BEG4?
All CD4532BEG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD4532BEG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD4532BEG4 part is unused and in its original packaging.
Return procedure for CD4532BEG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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