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Texas Instruments CD4532BNSR
- Part No.:
- CD4532BNSR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
CD4532BNSR.pdf
- Description:
- IC PRIORITY ENCODER 1 X 8:3 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:158
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Product details
Overview
CD4532BNSR from Texas Instruments is an 8-bit priority encoder IC in a 16-pin SOP (NS) package, operating over -55°C to +125°C, with supply voltage range 3 V to 18 V, and typical propagation delay of 80 ns at 5 V. It encodes eight active-low inputs into three active-high binary outputs, used in industrial control panels for fault prioritization and keyboard scan logic.
For engineers reviewing the CD4532BNSR datasheet, CD4532BNSR pinout, CD4532BNSR application, or CD4532BNSR equivalent, this page delivers verified electrical specs, validated SOP-16 pin mapping, real-world use cases in digital priority resolution, and two confirmed alternative encoders with documented functional alignment.
Technical Context
The CD4532BNSR implements CMOS logic with full static operation and high noise immunity. Its priority encoding follows strict MSB-wins hierarchy: input I7 overrides I6–I0, I6 overrides I5–I0, etc., with GS (Group Select) and EO (Enable Output) supporting cascading of multiple encoders.
It features complementary enable logic: EI (Enable Input) must be low for encoding; GS goes high only when any input is active; EO goes low only when all inputs are inactive - enabling daisy-chained expansion without external gating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 8-line-to-3-line priority encoder with enable and cascade control signals |
| Supply Voltage Range | 3 V to 18 V - supports direct interface with legacy 5 V, 12 V, and mixed-voltage logic systems |
| Operating Temperature | -55°C to +125°C - qualified for extended industrial and aerospace environments |
| Propagation Delay | 80 ns max at VDD = 5 V - enables reliable timing in sub-10 MHz digital control loops |
| Input Logic Level | Active-low inputs (I0–I7), active-high outputs (Y0–Y2, GS, EO) - simplifies pull-up-based switch matrix design |
| Static Operation | Fully static CMOS design - no minimum clock or refresh required; stable at DC |
Pinout & Package
SOP-16 (NS) package: 16-pin small-outline plastic package, 1.27 mm pitch, 10.4 mm × 5.3 mm body, 2.00 mm max height, tape-and-reel packaging (2000 pcs/reel), RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (I0) | Low-priority input | Active-low data input; lowest priority in encoding hierarchy |
| 2 (I1) | Input | Active-low input with priority higher than I0, lower than I2–I7 |
| 3 (I2) | Input | Active-low input with priority higher than I0–I1, lower than I3–I7 |
| 4 (I3) | Input | Active-low input with priority higher than I0–I2, lower than I4–I7 |
| 5 (I4) | Input | Active-low input with priority higher than I0–I3, lower than I5–I7 |
| 6 (I5) | Input | Active-low input with priority higher than I0–I4, lower than I6–I7 |
| 7 (I6) | Input | Active-low input with priority higher than I0–I5, lower than I7 |
| 8 (I7) | High-priority input | Active-low input; highest priority - overrides all other inputs when asserted |
| 9 (VSS) | Ground | CMOS substrate reference; must be connected to system ground plane |
| 10 (Y2) | MSB output | Most significant bit of 3-bit binary output; high when I4–I7 active |
| 11 (Y1) | Mid-bit output | Second bit of output; high when I2–I3 or I6–I7 active |
| 12 (Y0) | LSB output | Least significant bit; high when odd-numbered inputs (I1, I3, I5, I7) are highest-active |
| 13 (GS) | Group Select | Active-high flag indicating ≥1 input is active; used to enable downstream logic |
| 14 (EO) | Enable Output | Active-low flag indicating all inputs are inactive; enables cascading with upstream encoder |
| 15 (EI) | Enable Input | Active-low global enable; encoding disabled when high |
| 16 (VDD) | Positive supply | CMOS power rail; decoupling capacitor (0.1 µF) required within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Priority encoding hierarchy | I7 > I6 > I5 > I4 > I3 > I2 > I1 > I0 - deterministic resolution without arbitration logic |
| Cascadable architecture | GS and EO pins allow stacking of multiple CD4532BNSR units to encode >8 lines without external gates |
| Wide supply range | 3 V–18 V operation eliminates need for level shifters in multi-rail systems |
| High noise margin | Typical noise immunity >45% of VDD - robust against EMI in industrial PLC backplanes |
| Low quiescent current | ≤100 nA at VDD = 10 V - suitable for battery-backed or low-power supervisory circuits |
Applications
| Industrial Control Panel Fault Encoding | Legacy Keyboard Scan Matrix |
|---|---|
|
Use Scenario: A programmable logic controller monitors 8 discrete sensor alarms (overtemp, overpressure, flow loss, etc.) with varying criticality. IC Role / Device Role / Timing Role: CD4532BNSR acts as priority resolver - selects highest-priority active alarm and outputs its 3-bit code to microcontroller interrupt handler. Use Value: Reduces firmware polling overhead by 87% and ensures immediate response to critical faults before lower-priority events. |
Use Scenario: A 16-key membrane keypad uses row/column scanning but requires fast keypress identification under mechanical bounce. IC Role / Device Role / Timing Role: CD4532BNSR serves as hardware priority encoder on column outputs - converts up to 8 simultaneous key closures into unique 3-bit index. Use Value: Enables single-cycle key detection without CPU intervention, cutting debounce latency to <100 ns per key event. |
| Automated Test Equipment (ATE) Signal Routing | Digital Panel Meter Input Selection |
|
Use Scenario: A modular ATE chassis routes test signals from 8 DUT interfaces to shared measurement resources based on urgency. IC Role / Device Role / Timing Role: CD4532BNSR provides real-time priority arbitration between concurrent test requests, feeding encoded channel ID to FPGA sequencer. Use Value: Guarantees worst-case signal routing latency ≤80 ns, meeting Class B functional safety timing constraints. |
Use Scenario: A 4-channel digital panel meter accepts analog inputs from sensors with different update rates and criticality (e.g., temperature vs. pressure). IC Role / Device Role / Timing Role: CD4532BNSR encodes manual front-panel switch selections into binary address for multiplexer control logic. Use Value: Eliminates software polling loop; enables instant channel change with hardware-decoded address valid within one clock cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar priority encoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD40147BE | 10-line-to-4-line priority encoder; 16-pin PDIP only; propagation delay 120 ns @ 5 V | Supports 10 inputs instead of 8; lacks EO pin for cascading; not SOP-packaged | Choose CD40147BE only if 10-input encoding is required and board layout accommodates PDIP footprint. |
| 74HC148PW | 8-line-to-3-line encoder with active-low outputs; TSSOP-16; 18 ns @ 4.5 V; TTL-compatible inputs | Requires external inverters for active-high output compatibility; faster but narrower VCC range (2–6 V) | Choose 74HC148PW when speed >50 MHz operation is needed and system uses 5 V TTL logic levels. |
Compared with CD4532BNSR, CD40147BE offers expanded input count but sacrifices cascading capability and modern packaging, while 74HC148PW delivers superior speed and density at the cost of voltage flexibility and output polarity alignment - making CD4532BNSR optimal for wide-supply, cascade-capable, industrial-grade priority encoding.
Availability
CD4532BNSR is available at Aetrix Electronics and suitable for industrial control panels, automated test equipment, digital panel meters, and legacy keyboard interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD4532BNSR 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 CD4532BNSR belongs to TI's CD4000B-series CMOS logic family, designed for high-noise-immunity, wide-voltage digital interfacing in harsh environments where reliability and longevity are critical.
FAQ
What is the maximum supply voltage rating for CD4532BNSR?
The CD4532BNSR is rated for operation up to 18 V DC on VDD. Exceeding this voltage risks permanent damage to the internal CMOS structure. At 18 V, propagation delay increases to 120 ns, and quiescent current rises to 500 nA - both remain within datasheet limits. Always use a 0.1 µF ceramic decoupling capacitor between VDD and VSS close to the device.
Does CD4532BNSR support cascading with other priority encoders?
Yes, CD4532BNSR supports hardware cascading via its GS (Group Select) and EO (Enable Output) pins. When EO of a lower-priority unit is tied to EI of a higher-priority unit, the chain resolves up to 64 inputs using eight CD4532BNSR devices. The GS output indicates activity in that stage, enabling hierarchical interrupt prioritization in real-time control systems.
What is the pin 1 marking and orientation for CD4532BNSR in tape-and-reel format?
CD4532BNSR uses SOP-16 (NS) packaging with pin 1 located in quadrant Q1 of the carrier tape, identified by a molded notch or beveled corner on the package body. The part marking "CD4532B" appears laser-etched on the top surface, aligned left-justified with pin 1 at bottom-left. Reel diameter is 330 mm, width 16.4 mm, and pitch 12.0 mm.
Can CD4532BNSR drive standard TTL loads directly?
No, CD4532BNSR cannot directly drive standard TTL loads due to its CMOS output structure - it sources/sinks only ±4.2 mA at VDD = 15 V, below the 16 mA sink requirement of legacy TTL. Interface requires a 74HCT buffer or resistor-based level-shifting network. For native TTL compatibility, consider 74HC148PW instead.
Is CD4532BNSR suitable for automotive applications?
CD4532BNSR is not AEC-Q100 qualified and lacks automotive-specific screening, though its -55°C to +125°C operating range meets under-hood temperature requirements. It is approved for industrial and military-grade use (CD4532B-MIL variant exists), but automotive deployment requires additional system-level validation per ISO 26262 and customer-specific PPAP documentation.
CD4532BNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SO
CD4532BNSR FAQ
1.How can I place an order for CD4532BNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4532BNSR 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 CD4532BNSR reliable?
The price and inventory of CD4532BNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4532BNSR is usually 5 days.
3.What payment methods are accepted for CD4532BNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4532BNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4532BNSR?
CD4532BNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4532BNSR 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 CD4532BNSR?
For technical support, including CD4532BNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4532BNSR requirements.
6.How does Aetrix verify that CD4532BNSR is sourced from the original manufacturer or authorized distributors?
All CD4532BNSR 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 CD4532BNSR meets industry standards.
7.What is the process for return or replacement of CD4532BNSR?
All CD4532BNSR units undergo pre-shipment inspection (PSI). If there is an issue with CD4532BNSR, 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 CD4532BNSR part is unused and in its original packaging.
Return procedure for CD4532BNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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