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Texas Instruments CD4585BPWR
- Part No.:
- CD4585BPWR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD4585BPWR.pdf
- Description:
- IC COMPARATOR MAG 4BIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,294
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Product details
Overview
CD4585BPWR from Texas Instruments is a 4-bit magnitude comparator IC used for digital logic-level comparison in combinational circuits, featuring A>B, A=B, and A<B outputs, propagation delay of 140 ns (max) at 5 V, operating voltage range of 3 V to 18 V, and CMOS technology compatibility with TTL inputs. It is deployed in address decoding, arithmetic logic units, and priority encoders.
For engineers reviewing the CD4585BPWR datasheet, CD4585BPWR pinout, CD4585BPWR application, or CD4585BPWR equivalent, key selection criteria include its wide supply voltage range, dual-supply tolerance, high noise immunity, and compatibility with both CMOS and TTL logic families in legacy industrial control and instrumentation designs.
Technical Context
The CD4585BPWR implements a fully decoded 4-bit parallel magnitude comparison using static CMOS logic, with three independent active-high outputs asserting logical states for greater-than, equal-to, and less-than relationships. Its input structure accepts direct connection to TTL outputs without level-shifting due to buffered input thresholds.
Designed for operation across –55°C to +125°C, the device uses unbuffered outputs with symmetrical source/sink drive capability (±4.2 mA at 15 V), enabling direct fan-out to up to 10 CMOS loads or two low-power TTL loads without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 4-bit magnitude comparator with A>B, A=B, A<B outputs |
| Supply Voltage Range | 3 V to 18 V - supports mixed-voltage system interfacing and battery-backed operation |
| Propagation Delay | 140 ns max at VDD = 5 V - defines maximum clock rate in synchronous comparator chains |
| Output Drive | ±4.2 mA at VDD = 15 V - enables direct driving of multiple CMOS inputs or low-power TTL gates |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and military-grade environments |
| Input Compatibility | TTL-compatible thresholds - allows seamless integration with legacy 74-series logic without level shifters |
Pinout & Package
CD4585BPWR is housed in a 16-pin Thin Shrink Small-Outline Package (TSSOP) with 0.65 mm pitch, 5.1 mm × 4.5 mm body size, and 1.2 mm max height - optimized for high-density PCB layouts and automated surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | A0–A3 inputs | 4-bit operand A (LSB to MSB); CMOS/TTL-compatible inputs with hysteresis |
| 5, 6, 7, 8 | B0–B3 inputs | 4-bit operand B (LSB to MSB); identical electrical specs to A inputs |
| 9, 10, 11 | A>B, A=B, A<B outputs | Active-high, unbuffered outputs; require external pull-up only when interfacing with open-drain systems |
| 12, 13 | A<B and A>B cascading inputs | Enable multi-stage comparison; accept results from lower-order comparator (e.g., CD4585B) |
| 14 | VDD | Positive supply rail - must be decoupled locally with 0.1 µF ceramic capacitor |
| 16 | VSS | Ground reference - shared return path for all inputs/outputs; requires low-impedance layout |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range (3–18 V) | Eliminates need for dedicated voltage regulators in multi-rail systems and simplifies battery-powered design |
| CMOS/TTL input compatibility | Reduces external interface components in hybrid logic systems and avoids level-shifter ICs |
| Cascadable architecture | Supports 8-bit, 12-bit, or wider comparisons using multiple CD4585BPWR devices without glue logic |
| High noise immunity (≥45% VDD) | Ensures reliable operation in electrically noisy industrial environments such as PLC backplanes and motor drives |
Applications
| Address Decoding | Arithmetic Logic Unit (ALU) |
|---|---|
Use Scenario: Selecting memory or peripheral chips based on CPU address bus values in microcontroller-based systems. IC Role / Device Role / Timing Role: Digital comparator generating chip-select signals by comparing address bits against fixed decode patterns. Use Value: Enables deterministic, zero-latency address resolution without software overhead or timing-critical firmware intervention. | Use Scenario: Determining result status (e.g., zero, negative, overflow) during integer arithmetic operations in custom ALU implementations. IC Role / Device Role / Timing Role: Hardware-level magnitude evaluation feeding status flags into control logic for conditional branching. Use Value: Provides cycle-accurate comparison results synchronized with ALU clock edge, critical for pipelined execution. |
| Priority Encoder Interface | Industrial Control Sequencing |
Use Scenario: Resolving simultaneous interrupt requests from multiple sensors or actuators in real-time control panels. IC Role / Device Role / Timing Role: Ranking input request lines by binary weight to generate highest-priority encoded output. Use Value: Guarantees deterministic priority resolution within fixed hardware latency, eliminating software arbitration delays. | Use Scenario: Monitoring sequence step validity in programmable logic controllers (PLCs) where machine state transitions must follow strict ordering. IC Role / Device Role / Timing Role: Comparing current and next-step register values to validate progression compliance before enabling next actuator. Use Value: Enforces hard real-time safety constraints via combinational logic, independent of processor availability or firmware bugs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit magnitude comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4063BE | Same function and pinout; slower max propagation delay (200 ns at 5 V) and narrower supply range (3–15 V) | Suitable for lower-speed legacy systems where extended 18 V operation is not required | Select CD4063BE only if cost sensitivity outweighs speed and voltage margin requirements |
| 74HC85PW | Higher speed (24 ns typical at 5 V), but limited to 2–6 V supply and non-cascadable without external logic | Better for modern low-voltage digital systems requiring fast response, not for wide-voltage or multi-stage designs | Choose 74HC85PW when integrating into 3.3 V or 5 V-only systems with tight timing budgets |
Compared with CD4585BPWR, CD4063BE trades speed and voltage headroom for legacy compatibility, while 74HC85PW delivers superior speed in narrow-voltage domains but lacks native cascading support - making CD4585BPWR uniquely suited for robust, multi-voltage, expandable comparator architectures.
Availability
CD4585BPWR is available at Aetrix Electronics and suitable for industrial control systems, legacy instrumentation upgrades, and aerospace subsystems requiring stable component supply, long-term obsolescence management, and extended temperature performance.
Supply support for CD4585BPWR 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and aerospace qualification.
The CD4585BPWR belongs to TI's CD4000B-series CMOS logic family, engineered for high-noise-immunity, wide-supply-operation digital functions in harsh environments where reliability and longevity are critical.
FAQ
What is the maximum operating voltage for CD4585BPWR?
The CD4585BPWR supports a maximum operating voltage of 18 V DC, verified per the TI CD4585B datasheet (SCHS091B, July 2003). This rating applies across the full temperature range (–55°C to +125°C) and enables use in 12 V and 15 V industrial power domains without regulation. Exceeding 18 V risks permanent damage to the internal oxide layers.
Does CD4585BPWR support cascading for 8-bit comparisons?
Yes, CD4585BPWR supports hardware cascading via dedicated A<B IN and A>B IN pins (pins 12 and 13), allowing two devices to perform 8-bit magnitude comparison without external logic. The cascading mechanism uses the outputs of a lower-order CD4585BPWR to override higher-order results, preserving correct hierarchical evaluation per the functional truth table in the official datasheet.
Is CD4585BPWR RoHS compliant?
Yes, CD4585BPWR is RoHS compliant, as confirmed in TI's Packaging Information document (15-Jul-2026 addendum), which lists "Yes" under RoHS for all PW-suffix variants including CD4585BPWR. The lead finish is NIPDAU, and the device meets JEDEC Level-1 moisture sensitivity requirements for standard reflow profiles.
What is the thermal resistance (θJA) of CD4585BPWR?
The junction-to-ambient thermal resistance (θJA) for CD4585BPWR in its TSSOP-16 package is 150°C/W, per TI's NS0016A and PW0016A package thermal characterization data. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad, 2 oz Cu) and determines safe power dissipation limits - e.g., ≤33 mW continuous at ΔT = 5°C rise.
Can CD4585BPWR directly drive LEDs or relays?
No, CD4585BPWR cannot directly drive LEDs or relays. Its outputs are unbuffered CMOS with ±4.2 mA drive capability at 15 V - sufficient for logic-level fan-out but insufficient for typical LED (5–20 mA) or relay coil (10–100 mA) loads. External drivers (e.g., transistor switches or dedicated driver ICs) are required to interface with such loads while protecting the CD4585BPWR output stages.
CD4585BPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Magnitude Comparator
- Number of Bits:
- 4
- Output:
- Active High
- Output Function:
-
A
- Voltage - Supply:
- 3V ~ 18V
- Current - Output High, Low:
- 4.2mA, 4.2mA
- Max Propagation Delay @ V, Max CL:
- 160ns @ 15V, 50pF
- Current - Quiescent (Iq):
- 100 µA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
CD4585BPWR FAQ
1.How can I place an order for CD4585BPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4585BPWR 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 CD4585BPWR reliable?
The price and inventory of CD4585BPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4585BPWR is usually 5 days.
3.What payment methods are accepted for CD4585BPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4585BPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4585BPWR?
CD4585BPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4585BPWR 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 CD4585BPWR?
For technical support, including CD4585BPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4585BPWR requirements.
6.How does Aetrix verify that CD4585BPWR is sourced from the original manufacturer or authorized distributors?
All CD4585BPWR 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 CD4585BPWR meets industry standards.
7.What is the process for return or replacement of CD4585BPWR?
All CD4585BPWR units undergo pre-shipment inspection (PSI). If there is an issue with CD4585BPWR, 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 CD4585BPWR part is unused and in its original packaging.
Return procedure for CD4585BPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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