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Texas Instruments CD74ACT257E
- Part No.:
- CD74ACT257E
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74ACT257E.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:766
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Product details
Overview
CD74ACT257E from Texas Instruments is a quad 2-input non-inverting multiplexer with three-state outputs, designed for data routing in digital logic systems. It features 4.4ns typical propagation delay at 5V/25°C, ±24mA output drive, and operates across -55°C to +125°C. It is used in register-to-bus data selection and function generation within industrial control and test equipment.
For engineers reviewing the CD74ACT257E datasheet, CD74ACT257E pinout, CD74ACT257E application, or CD74ACT257E equivalent, key selection criteria include its ACT-series 4.5–5.5V supply range, high-speed 3-state bus interface capability, ESD-hardened CMOS process, and compatibility with FAST™-level fanout (15 loads).
Technical Context
The CD74ACT257E implements four independent 2:1 multiplexers sharing a common active-low Output Enable (OE) and Select (S) input. Each channel routes either I₀ or I₁ to Y based on S, with non-inverting output polarity. All outputs enter high-impedance state when OE is HIGH.
It uses SCR-latchup-resistant Advanced CMOS Logic, supports 50Ω transmission-line driving, and maintains balanced propagation delays between input-to-output and select-to-output paths - critical for synchronous data routing integrity in timing-sensitive logic designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures compatibility with standard 5V TTL/CMOS logic rails and stable operation under supply variation. |
| Propagation Delay (tPLH/tPHL) | 2.8ns (typ) at 5V - enables sub-10ns cycle timing in high-speed address/data switching applications. |
| Output Drive | ±24mA per output - supports direct fanout to 15 FAST™ ICs or termination into 50Ω lines without external buffers. |
| Operating Temperature | -55°C to +125°C - qualified for extended industrial and military-grade environments including motor control and avionics subsystems. |
| ESD Protection | ≥2kV HBM - meets MIL-STD-883 Method 3015, reducing susceptibility to handling damage in manufacturing and field service. |
| Input Capacitance | 10pF - minimizes loading on upstream drivers and preserves signal edge integrity in dense PCB layouts. |
Pinout & Package
CD74ACT257E is supplied in a 16-pin PDIP (N) package measuring 19.3mm × 9.4mm (body: 19.3mm × 6.35mm), with through-hole mounting and industry-standard DIP footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | Select (S), Output Enable (OE) | Shared control inputs: S selects between I₀/I₁ per channel; OE (active LOW) disables all outputs to high-Z. |
| 2, 3, 5, 6, 11, 10, 14, 13 | Data Inputs (1I₀, 1I₁, 2I₀, 2I₁, 3I₀, 3I₁, 4I₀, 4I₁) | Eight dedicated data inputs - two per multiplexer channel, supporting parallel 4-bit data selection. |
| 4, 7, 9, 12 | Outputs (1Y, 2Y, 3Y, 4Y) | Four non-inverting buffered outputs - each reflects selected input with three-state capability. |
| 8 | GND | Ground reference for logic and power return - must be low-impedance connection for noise immunity. |
| 16 | VCC | Positive supply terminal - requires local 0.1μF bypass capacitor to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Non-inverting outputs | Preserves logic polarity across all four channels - eliminates need for external inversion in data path design. |
| Buffered inputs | Reduces capacitive loading on upstream sources and improves noise margin versus unbuffered logic. |
| Balanced propagation delays | Minimizes skew between channels and between select/data paths - essential for glitch-free bus arbitration. |
| SCR-latchup-resistant process | Prevents destructive latch-up under transient overvoltage or ESD events - enhances reliability in harsh environments. |
| 1.5V to 5.5V AC-compatible variant support | Enables mixed-voltage system integration where CD74AC257 variants coexist with CD74ACT257E on shared buses. |
Applications
| Industrial PLC I/O Expansion | Automated Test Equipment (ATE) Signal Routing |
|---|---|
Use Scenario: Multiplexing sensor inputs or actuator command lines across limited microcontroller GPIOs in modular I/O racks. IC Role / Device Role / Timing Role: Quad 2:1 data selector enabling dynamic reconfiguration of analog/digital signal paths under firmware control. Use Value: Reduces PCB interconnect complexity and eliminates need for discrete analog switches or additional microcontrollers. | Use Scenario: Routing stimulus signals from multiple pattern generators to device-under-test pins during parallel functional testing. IC Role / Device Role / Timing Role: High-speed, low-skew bus switch synchronizing with ATE timing controllers for precise signal delivery windows. Use Value: Achieves <10ns channel-to-channel skew and supports 100+ MHz test vector rates via 50Ω line driving. |
| Digital Audio Data Switching | Legacy Bus Interface Translation |
Use Scenario: Selecting between dual audio codec outputs (e.g., DAC A/B) feeding a single amplifier or ADC input stage. IC Role / Device Role / Timing Role: Non-inverting multiplexer preserving sample clock alignment and minimizing jitter accumulation in audio data paths. Use Value: Maintains bit-accurate signal integrity with <0.5ns inter-channel delay mismatch across full temperature range. | Use Scenario: Adapting legacy 8-bit parallel bus protocols (e.g., ISA, GPIB) to modern FPGA-based controllers requiring selective address/data gating. IC Role / Device Role / Timing Role: Three-state-enabled data router isolating unused bus segments to prevent contention and leakage current. Use Value: Enables hot-swappable module detection and safe bus arbitration without external bus transceivers. |
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 |
|---|---|---|---|
| SN74ACT257N | Same ACT logic family, identical pinout and electrical specs; manufactured by TI with identical thermal and timing characteristics. | No functional difference - direct second-source option with identical qualification and packaging (PDIP-16). | Select when requiring TI-qualified alternate sourcing without layout or firmware changes. |
| 74ACT257PC | Same logic function and pinout; manufactured by ON Semiconductor with matching 4.5–5.5V VCC, ±24mA drive, and -55°C to +125°C rating. | Validated for same industrial temperature range and ESD robustness; minor differences in propagation delay distribution (±0.3ns). | Choose for multi-supplier strategy where cross-qualification to ON Semi's production line is required. |
Compared with SN74ACT257N and 74ACT257PC, CD74ACT257E offers identical functionality and timing but differs in part marking, tape-and-reel configuration, and RoHS compliance documentation - making it optimal for legacy PDIP-based designs requiring long-term TI-sourced continuity.
Availability
CD74ACT257E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automated test equipment signal routing, and legacy bus interface translation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74ACT257E 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 specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The CD74ACT257E belongs to TI's Advanced CMOS Logic (ACT) family, engineered for high-speed, low-power 5V digital interfacing with robust noise immunity and wide temperature operation.
FAQ
What is the recommended bypass capacitor for CD74ACT257E?
A 0.1μF ceramic capacitor is recommended directly between VCC (pin 16) and GND (pin 8) of the CD74ACT257E, placed as close as possible to the pins. This minimizes high-frequency supply noise and prevents output glitches during fast switching transitions. For enhanced broadband suppression, a parallel 1μF capacitor may be added nearby, but the 0.1μF unit remains mandatory per TI design guidelines for the CD74ACT257E.
Does CD74ACT257E support 3.3V operation?
No, CD74ACT257E does not support 3.3V operation. Its recommended operating VCC range is strictly 4.5V to 5.5V, as defined in the ACT-series specification. Using 3.3V violates the minimum supply requirement and will result in undefined logic states, increased propagation delay, and potential failure to meet output voltage thresholds. For 3.3V systems, consider the AC-series variant CD74AC257E instead.
How does the Output Enable (OE) pin function on CD74ACT257E?
The OE pin (pin 15) on CD74ACT257E is an active-low control that places all four outputs (1Y–4Y) into high-impedance state when driven HIGH. When OE is LOW, outputs respond normally to the Select (S) and input signals. This enables bus-sharing applications where multiple CD74ACT257E devices can share a common data line without contention - a core feature confirmed in the truth table and functional description of the CD74ACT257E.
What is the maximum fanout capability of CD74ACT257E?
CD74ACT257E provides ±24mA output drive per pin, enabling direct fanout to up to 15 FAST™ logic inputs (each requiring ~1.6mA). This is explicitly stated in the datasheet features and verified in the DC Electrical Characteristics table. The fanout value assumes nominal 5V supply and 25°C ambient; derating applies at temperature extremes or higher capacitive loads, but the CD74ACT257E maintains full drive strength across its full -55°C to +125°C operating range.
Is CD74ACT257E pin-compatible with CD74AC257E?
Yes, CD74ACT257E is pin-compatible with CD74AC257E - both use identical 16-pin PDIP (N) packaging and share identical pin functions, including Select (S), Output Enable (OE), data inputs (I₀/I₁), and outputs (Y). However, they differ in supply voltage range (AC: 1.5–5.5V; ACT: 4.5–5.5V) and propagation delay performance, so substitution requires verification of system-level VCC and timing margins for the CD74ACT257E.
CD74ACT257E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 75mA, 75mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74ACT257E FAQ
1.How can I place an order for CD74ACT257E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT257E 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 CD74ACT257E reliable?
The price and inventory of CD74ACT257E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT257E is usually 5 days.
3.What payment methods are accepted for CD74ACT257E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT257E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT257E?
CD74ACT257E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT257E 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 CD74ACT257E?
For technical support, including CD74ACT257E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT257E requirements.
6.How does Aetrix verify that CD74ACT257E is sourced from the original manufacturer or authorized distributors?
All CD74ACT257E 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 CD74ACT257E meets industry standards.
7.What is the process for return or replacement of CD74ACT257E?
All CD74ACT257E units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT257E, 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 CD74ACT257E part is unused and in its original packaging.
Return procedure for CD74ACT257E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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