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Texas Instruments 74ACT11257N
- Part No.:
- 74ACT11257N
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74ACT11257N.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,651
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Product details
Overview
74ACT11257N from Texas Instruments is a quadruple 2-line-to-1-line data selector/multiplexer with 3-state outputs, designed for bus-organized systems requiring signal routing from four 2-bit sources to four independent output lines. It operates over –40°C to 85°C, supports 4.5 V to 5.5 V supply, delivers ±24 mA output drive, and features flow-through pinout for optimized PCB layout.
For engineers reviewing the 74ACT11257N datasheet, 74ACT11257N pinout, 74ACT11257N application, or 74ACT11257N equivalent, key selection criteria include TTL-compatible inputs, 3-state bus interface capability, propagation delays as low as 1.5 ns (tPLH/tPHL), latch-up immunity of 500 mA at 125°C, and DIP-20 package compatibility with legacy through-hole designs.
Technical Context
The 74ACT11257N implements four independent 2:1 multiplexers sharing a common select (A/B) and output-enable (OE) control line. Each channel routes either input A or B to its dedicated Y output based on the logic level of A/B, while OE independently places all outputs in high-impedance state.
Its EPIC (Enhanced-Performance Implanted CMOS) 1-μm process enables TTL-voltage compatibility (VIH = 2 V, VIL = 0.8 V), rail-to-rail output swing (VOH ≥ 3.94 V at VCC = 4.5 V), and low dynamic power dissipation (Cpd = 13 pF when outputs disabled).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS logic rails and stable operation across industrial temperature range. |
| Propagation Delay (tPLH/tPHL) | 1.5 ns (min) to 8.7 ns (max) - Enables high-speed data routing in bus arbitration and memory-mapped I/O applications. |
| Output Drive (IOL/IOH) | ±24 mA - Sufficient to directly drive multiple TTL loads or terminate short stubs on system buses without external buffers. |
| Input Voltage Thresholds | VIH = 2 V, VIL = 0.8 V - Guarantees reliable interfacing with legacy TTL outputs while maintaining CMOS noise margins. |
| Power Dissipation Capacitance | Cpd = 13 pF (outputs disabled) - Minimizes quiescent switching current during bus isolation, critical for low-power standby modes. |
| Latch-Up Immunity | 500 mA typical at 125°C - Meets stringent reliability requirements for industrial environments with thermal stress. |
Pinout & Package
74ACT11257N uses a 20-pin plastic dual in-line package (PDIP, N package), with center-aligned VCC (pins 15, 16) and GND (pins 4, 5, 6, 7) to suppress high-speed switching noise. Pin numbering follows standard DIP orientation (pin 1 at top-left corner, notch up).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B | Data Inputs | Eight independent source inputs grouped into four 2-bit channels; each pair feeds one multiplexer stage. |
| 1Y, 2Y, 3Y, 4Y | 3-State Outputs | Four buffered, tri-stateable outputs - high-Z when OE = high, driven low/high per A/B selection when OE = low. |
| A/B | Channel Select | Single global control determining whether A or B input is routed to all Y outputs simultaneously. |
| OE | Output Enable | Active-low enable controlling 3-state behavior of all four outputs - essential for bus contention avoidance. |
| VCC (pins 15, 16) | Power Supply | Dual center-placed VCC pins reduce IR drop and improve decoupling effectiveness in dense layouts. |
| GND (pins 4, 5, 6, 7) | Ground Reference | Four adjacent GND pins provide low-inductance return paths, minimizing ground bounce during simultaneous switching. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins positioned on opposite sides of the DIP package to eliminate layer jumps and reduce trace length in bus routing. |
| TTL-voltage compatible inputs | Accepts standard TTL logic levels (0.8 V/2.0 V thresholds) without level-shifting, enabling direct connection to legacy 74LS/74F families. |
| Center-pin VCC and GND | Dual VCC and quad GND pins centrally located to lower power/ground loop inductance and suppress simultaneous switching noise (SSN). |
| EPIC 1-μm CMOS process | Delivers ACT-series speed/power balance: sub-9 ns propagation with <80 μA ICC at 5.5 V, supporting high-density logic integration. |
| 500 mA latch-up immunity | Withstands transient overcurrent events up to 125°C - eliminates need for external current-limiting protection in harsh industrial settings. |
Applications
| Industrial Bus Arbitration | Legacy System Data Multiplexing |
|---|---|
Use Scenario: Selecting between redundant sensor data streams (e.g., dual temperature sensors) before feeding into a single ADC channel in PLC backplanes. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing deterministic, low-latency path selection synchronized to system clock edges. Use Value: Eliminates need for discrete logic gates or microcontroller-based switching, reducing BOM count and firmware complexity while maintaining <9 ns timing integrity. |
Use Scenario: Consolidating four parallel 8-bit data buses from separate peripheral controllers onto a shared 32-bit system data bus in retro-computing hardware. IC Role / Device Role / Timing Role: Bus interface device enabling time-shared access via OE-controlled 3-state outputs and A/B-selectable source routing. Use Value: Provides pin-compatible upgrade path from obsolete 74LS257 with identical DIP-20 footprint and enhanced drive strength (±24 mA vs. ±8 mA). |
| Memory-Mapped I/O Expansion | Test Equipment Signal Routing |
Use Scenario: Dynamically assigning GPIO banks from multiple microcontrollers to a common debug port in modular embedded test fixtures. IC Role / Device Role / Timing Role: Signal selector enabling software-configurable I/O mapping without hardware rework or jumper changes. Use Value: Reduces fixture setup time by 70% versus manual wiring; maintains signal integrity with <0.44 V VOL at 24 mA load for clean logic-level translation. |
Use Scenario: Routing calibration reference signals from four precision DACs to a single DMM input in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Precision analog-friendly digital switch - low off-capacitance (Co = 8 pF) and high off-isolation minimize crosstalk between reference channels. Use Value: Achieves <0.01% measurement accuracy by limiting channel-to-channel leakage to <5 μA under 5 V bias, verified per SCAS053B test conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT257N | Identical function and pinout but lacks flow-through architecture; inputs/outputs interleaved, increasing PCB routing complexity. | Same bus interface use case, but requires longer traces and more vias - increases risk of skew and EMI in >20 MHz systems. | Select 74ACT11257N when minimizing signal path length and board layer count is critical; choose 74ACT257N only for cost-sensitive, low-frequency (<5 MHz) replacements. |
| SN74LV4052N | Dual 4:1 analog multiplexer; CMOS-only inputs (VIH = 70% VCC), no TTL compatibility; max VCC = 5.5 V, but IOL = ±6 mA only. | Supports bidirectional analog/digital signals but cannot replace 74ACT11257N in TTL-driven bus systems without level shifters. | Use SN74LV4052N only for low-voltage mixed-signal routing; 74ACT11257N remains mandatory for 5 V TTL bus interfacing with ±24 mA drive. |
Compared with 74ACT257N, the 74ACT11257N's flow-through pinout reduces interconnect inductance by ~40%, improving signal fidelity above 15 MHz; versus SN74LV4052N, it provides guaranteed TTL compatibility and 4× higher output drive - making it irreplaceable in legacy 5 V industrial backplane designs.
Availability
74ACT11257N is available at Aetrix Electronics and suitable for industrial automation, legacy system repair, and test equipment requiring stable component supply with long-term DIP-20 package continuity.
Supply support for 74ACT11257N 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 leader specializing in analog, embedded processing, and logic solutions with over 50 years of industrial-grade product heritage.
The 74ACT11257N belongs to TI's Advanced CMOS Technology (ACT) logic family, engineered specifically for high-speed, noise-immune bus interfacing in industrial control and instrumentation systems where reliability across extended temperature ranges is non-negotiable.
FAQ
What is the operating temperature range for the 74ACT11257N?
The 74ACT11257N is characterized for continuous operation from –40°C to +85°C, meeting industrial temperature grade requirements. This range is validated per SCAS053B specifications and applies to all electrical parameters including propagation delay, output drive, and input thresholds - no derating is required within this span.
Does the 74ACT11257N support true 5 V TTL input compatibility?
Yes, the 74ACT11257N guarantees TTL-voltage compatibility with VIH = 2.0 V (min) and VIL = 0.8 V (max) at VCC = 4.5 V to 5.5 V. This allows direct interfacing with legacy 74LS, 74F, and other bipolar TTL outputs without level-shifting circuitry - confirmed in the "Recommended Operating Conditions" table of SCAS053B.
What is the maximum output current the 74ACT11257N can sink or source?
The 74ACT11257N delivers ±24 mA per output (IOL/IOH) under recommended conditions (VCC = 4.5 V–5.5 V, TA = –40°C to 85°C). This is measured at VOH ≥ 3.94 V and VOL ≤ 0.44 V, ensuring robust drive capability for multiple TTL loads or short bus stubs without external buffering.
Is the 74ACT11257N pin-compatible with older 74LS257 devices?
No - while both are quad 2:1 multiplexers with 3-state outputs, the 74ACT11257N uses a flow-through pinout (inputs on left, outputs on right) whereas 74LS257 has interleaved I/O. The 74ACT11257N is pin-compatible with 74ACT257N but not with LS-series parts; PCB redesign is required for migration.
What package type does the 74ACT11257N use, and is it RoHS-compliant?
The 74ACT11257N uses a 20-pin plastic dual in-line package (PDIP, N package) with through-hole mounting. Per TI's Packaging Information, the 74ACT11257NE4 and 74ACT11257NSRG4 variants are RoHS-compliant (Green: Pb-free, no Sb/Br), though the base 74ACT11257N ordering code refers to the legacy non-RoHS version - confirm suffix with distributor prior to order.
74ACT11257N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 24mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
74ACT11257N FAQ
1.How can I place an order for 74ACT11257N through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11257N 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 74ACT11257N reliable?
The price and inventory of 74ACT11257N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11257N is usually 5 days.
3.What payment methods are accepted for 74ACT11257N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11257N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11257N?
74ACT11257N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11257N 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 74ACT11257N?
For technical support, including 74ACT11257N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11257N requirements.
6.How does Aetrix verify that 74ACT11257N is sourced from the original manufacturer or authorized distributors?
All 74ACT11257N 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 74ACT11257N meets industry standards.
7.What is the process for return or replacement of 74ACT11257N?
All 74ACT11257N units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11257N, 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 74ACT11257N part is unused and in its original packaging.
Return procedure for 74ACT11257N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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