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Texas Instruments CD54HC257F3A
- Part No.:
- CD54HC257F3A
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54HC257F3A.pdf
- Description:
- HIGH SPEED CMOS LOGIC NON-INVERT
- Quantity:
- Payment:
- Shipping:
Inventory:2,146
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Product details
Overview
CD54HC257F3A from Texas Instruments is a military-grade quad 2-input multiplexer with three-state non-inverting outputs, designed for high-reliability data routing in harsh environments. It operates from 2V to 6V, delivers 12ns typical propagation delay (VCC = 5V, CL = 15pF), supports -55°C to +125°C operation, and features active-low output enable (OE) for bus isolation-commonly used in register-to-bus data transfer and function generation in avionics and defense systems.
For engineers reviewing the CD54HC257F3A datasheet, CD54HC257F3A pinout, CD54HC257F3A application, or CD54HC257F3A equivalent, key selection criteria include its CERDIP-16 package, HC logic family voltage flexibility, guaranteed wide-temperature performance, and precise three-state timing behavior under load.
Technical Context
The CD54HC257F3A implements four identical 2:1 multiplexers sharing one common select (S) input and one active-low output enable (OE) control line. Each channel routes either I0 or I1 to Y based on S state, with all outputs entering high-impedance when OE is HIGH.
Its HC logic family ensures CMOS-level input thresholds (VIH = 1.5V min at VCC = 2V; 4.2V min at VCC = 6V), low quiescent current (≤160 µA over full temperature range), and balanced rise/fall times (10–15 ns typical at 5V/CL = 15pF), enabling clean signal switching in mixed-voltage digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), not TTL-compatible; requires 2V–6V supply for full spec compliance |
| Propagation Delay (In to Y) | 12 ns typical at VCC = 5V, CL = 15pF - enables sub-50 MHz data routing in synchronous systems |
| Operating Temperature | -55°C to +125°C - qualified for military/aerospace applications per MIL-PRF-38535 |
| Output Type | Three-state non-inverting - allows direct connection to shared buses without external isolation |
| Input Leakage Current | ±1 µA max over full temperature range - minimizes unintended loading in high-impedance control paths |
| Supply Voltage Range | 2V to 6V - supports battery-backed, dual-rail, and legacy 5V systems without level shifters |
| Package | 16-lead CERDIP (J package) - hermetically sealed ceramic for moisture resistance and thermal stability |
Pinout & Package
CD54HC257F3A uses a 16-lead Ceramic Dual In-line Package (CERDIP, TI package code J), rated for high-reliability, extended-temperature operation. The package is unibody ceramic with solderable tin-lead (SNPB) finish and no moisture sensitivity level (MSL N/A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 12, 13, 15, 16 | Data Inputs (1I0, 1I1, 2I0, 2I1, 3I0, 3I1, 4I0, 4I1) | Eight independent data inputs grouped into four 2-input pairs; each pair feeds one multiplexer channel |
| 3, 14 | Select (S) and Output Enable (OE) | Single global S selects source per channel; OE (active LOW) disables all outputs simultaneously into high-Z |
| 6, 8, 10, 11 | Outputs (1Y, 2Y, 3Y, 4Y) | Non-inverting three-state outputs - drive loads only when OE = LOW and reflect selected input |
| 7 | GND | Ground reference for logic and power return; must be low-impedance for noise immunity |
| 9 | VCC | Positive supply rail (2V–6V); decoupling capacitor required near pin for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2V–6V operation enables compatibility with 3.3V, 5V, and mixed-supply systems without translation |
| High Noise Immunity | NIL/NIL = 30% of VCC at 5V - rejects >1.5V noise spikes on inputs, critical in EMI-prone platforms |
| Low Power Consumption | ICC ≤ 160 µA over full temperature range - reduces thermal load in sealed enclosures and battery systems |
| Guaranteed Timing Over Temp | Max propagation delay 45 ns at -55°C to +125°C (VCC = 4.5V, CL = 50pF) - supports deterministic real-time routing |
| Three-State Bus Interface | IOZ ≤ ±10 µA in high-Z mode - prevents bus contention and leakage in multi-driver architectures |
Applications
| Avionics Data Acquisition | Military Sensor Interface |
|---|---|
Use Scenario: Routing analog-to-digital converter outputs from redundant sensor channels to a central processor in flight control units. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer selects between primary and backup sensor streams per channel under software-controlled S/OE signals. Use Value: Enables hot-swappable sensor redundancy with zero bus contention during failover, leveraging guaranteed -55°C to +125°C timing. | Use Scenario: Consolidating telemetry data from multiple field-deployable sensors (temperature, pressure, vibration) onto a shared MIL-STD-1553 or RS-422 bus. IC Role / Device Role / Timing Role: Data selector isolates inactive sensor groups via OE while routing active group outputs to bus drivers. Use Value: Reduces PCB interconnect count by 50% versus discrete gating; CERDIP package withstands shock/vibe per MIL-STD-810. |
| Secure Crypto Module Control | Ruggedized Industrial PLC I/O |
Use Scenario: Switching between two independent cryptographic key sources (hardware RNG vs. secure memory) feeding an AES engine in tamper-resistant modules. IC Role / Device Role / Timing Role: Multiplexer acts as hardware-enforced key path selector, with OE tied to physical tamper detect signal. Use Value: Prevents simultaneous key exposure; HC logic thresholds ensure reliable switching even under voltage glitch attacks. | Use Scenario: Managing discrete I/O expansion in programmable logic controllers operating in oil/gas or power substation cabinets. IC Role / Device Role / Timing Role: Routes status bits from isolated input cards to CPU backplane, synchronized to scan cycle clock edges. Use Value: Eliminates need for FPGA-based glue logic; CERDIP hermetic seal prevents corrosion in humid, sulfurous environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD54HCT257F3A | LSTTL-compatible inputs (VIH ≥ 2V, VIL ≤ 0.8V); same CERDIP-16 package and temp range | Required where legacy 5V TTL logic drives inputs directly without level shifters | Choose when interfacing with older 74LS/74ALS families; not drop-in due to input threshold mismatch with HC |
| CD74HC257E | Same HC logic, but in 16-lead PDIP (plastic DIP); commercial temp range (-55°C to +125°C same, but not QML-qualified) | Suitable for lab prototypes or non-military production where cost and rework ease outweigh hermeticity needs | Use for development or cost-sensitive industrial designs; lacks military screening and CERDIP reliability |
Compared with CD54HC257F3A, CD54HCT257F3A offers direct TTL input compatibility at the expense of wider VCC tolerance, while CD74HC257E trades hermetic packaging and QML qualification for lower cost and easier hand-soldering-neither is pin-compatible without layout revision due to differing package footprints.
Availability
CD54HC257F3A is available at Aetrix Electronics and suitable for avionics data acquisition, military sensor interface, secure crypto module control, and ruggedized industrial PLC I/O requiring stable component supply across extended temperature and long lifecycle programs.
Supply support for CD54HC257F3A 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 U.S.-based semiconductor company specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The CD54HC257F3A belongs to TI's military-grade HC logic family, engineered for deterministic digital signal routing in mission-critical systems where extended temperature operation and hermetic packaging are mandatory.
FAQ
What is the maximum clock/data rate supported by CD54HC257F3A?
The CD54HC257F3A is not a clocked device but a combinational multiplexer; its usable data rate depends on propagation delay and system timing margins. With 12 ns typical tPLH/tPHL at 5V/15pF and 45 ns max over full temperature, it supports reliable data routing up to ~10–15 MHz in well-designed PCB layouts with controlled trace impedance and proper decoupling. System-level setup/hold timing must be verified per application.
Does CD54HC257F3A require external pull-up or pull-down resistors on its inputs?
No, CD54HC257F3A does not require external pull-up or pull-down resistors on its inputs. Its CMOS inputs have ≤±1 µA leakage over temperature, and defined VIH/VIL thresholds ensure stable logic states with driven signals. However, floating inputs must be avoided-unused I0/I1/S/OE pins should be tied to VCC or GND to prevent oscillation and excess current draw.
Can CD54HC257F3A operate reliably at 3.3V supply?
Yes, CD54HC257F3A operates reliably at 3.3V supply. As an HC-family device, it is fully specified from 2V to 6V. At VCC = 3.3V, VIH is guaranteed ≥ 2.0V and VIL ≤ 1.1V, providing adequate noise margin. Propagation delay increases slightly (~20–25 ns typical), but remains within specification across -55°C to +125°C.
Is CD54HC257F3A RoHS compliant?
No, CD54HC257F3A is not RoHS compliant. It uses a tin-lead (SNPB) solder finish on its CERDIP package and is designated as "No" in TI's packaging addendum. This reflects its military qualification path and exemption under RoHS Annex III for high-reliability applications. For RoHS-compliant alternatives, consider CD74HC257M96 (SOIC, lead-free).
How does the output enable (OE) pin behave during power-up?
During power-up, CD54HC257F3A OE pin state is undefined until VCC reaches valid logic thresholds. To prevent bus contention, OE must be held HIGH (inactive) via external circuitry-such as a reset supervisor or RC network-until VCC stabilizes and system control logic asserts valid OE. TI recommends tying OE to VCC through a 10kΩ resistor for default high-Z startup.
CD54HC257F3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Data Selector/Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
CD54HC257F3A FAQ
1.How can I place an order for CD54HC257F3A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HC257F3A 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 CD54HC257F3A reliable?
The price and inventory of CD54HC257F3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HC257F3A is usually 5 days.
3.What payment methods are accepted for CD54HC257F3A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HC257F3A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HC257F3A?
CD54HC257F3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HC257F3A 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 CD54HC257F3A?
For technical support, including CD54HC257F3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HC257F3A requirements.
6.How does Aetrix verify that CD54HC257F3A is sourced from the original manufacturer or authorized distributors?
All CD54HC257F3A 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 CD54HC257F3A meets industry standards.
7.What is the process for return or replacement of CD54HC257F3A?
All CD54HC257F3A units undergo pre-shipment inspection (PSI). If there is an issue with CD54HC257F3A, 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 CD54HC257F3A part is unused and in its original packaging.
Return procedure for CD54HC257F3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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