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Texas Instruments 74AC11257PWRE4
- Part No.:
- 74AC11257PWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC11257PWRE4.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,063
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Product details
Overview
74AC11257PWRE4 from Texas Instruments is a quadruple 2-line-to-1-line data selector/multiplexer with 3-state outputs in a 20-pin TSSOP package, operating across −40°C to 85°C, supporting VCC = 3–5.5 V, with tPHL/tPLH ≤ 6.4 ns at 5 V and ±24 mA output drive capability. It enables bus interface from four independent 2-source data paths in high-performance digital systems.
For engineers reviewing the 74AC11257PWRE4 datasheet, 74AC11257PWRE4 pinout, 74AC11257PWRE4 application, or 74AC11257PWRE4 equivalent, this device serves as a logic-level signal routing solution for system buses requiring low propagation delay, flow-through PCB layout, and noise-minimized center-pin VCC/GND configuration.
Technical Context
This device implements four independent 2:1 multiplexers sharing a common 3-state output-enable (OE) control, each selecting between A or B inputs based on the A/B select line. All outputs are TTL-compatible and support high-impedance tri-state operation when OE is high.
Its flow-through architecture places inputs and outputs on opposite sides of the package, minimizing trace crossovers. The center-pin VCC and GND arrangement reduces simultaneous switching noise, and it delivers 500-mA latch-up immunity at 125°C per JEDEC JESD78.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3 V to 5.5 V - supports mixed-voltage system interfacing and robust operation across industrial supply tolerances |
| Propagation Delay (tPLH/tPHL) | ≤ 6.4 ns at VCC = 5 V - enables synchronization in sub-100-MHz digital control and data path applications |
| Output Drive (IOL/IOH) | ±24 mA at VCC = 5 V - directly drives standard TTL loads without external buffers |
| Input Thresholds (VIH/VIL) | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - ensures noise margin > 0.7 V under worst-case supply and temperature |
| Power Dissipation Capacitance (Cpd) | 11 pF (outputs disabled), 37 pF (outputs enabled) - determines dynamic power consumption in clocked bus environments |
| Latch-Up Immunity | 500 mA typical at 125°C - meets JEDEC JESD78 Class II requirements for robustness in harsh thermal environments |
Pinout & Package
74AC11257PWRE4 uses a 20-pin TSSOP (PW) package with 0.65 mm pitch, 6.4 mm × 4.4 mm body size, and 1.2 mm max height. Pin 1 index area is marked with a dot; seating plane defined per JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | 1A, 1B, 2A, 2B | Data inputs for first two multiplexers; routed to Y1/Y2 outputs based on A/B select state |
| 5, 6, 7, 8 | 3A, 3B, 4A, 4B | Data inputs for third and fourth multiplexers; enable parallel 4-channel selection |
| 9 | OE | Active-low 3-state output enable; must be pulled up to VCC during power-up to ensure Hi-Z default |
| 10, 11, 12, 13 | 1Y, 2Y, 3Y, 4Y | Tri-state outputs; present selected A/B data or high-impedance when OE = high |
| 14, 15, 16, 17 | GND | Four dedicated ground terminals - reduce ground bounce and improve noise immunity in high-speed switching |
| 18, 19 | VCC | Two dedicated power terminals - lower impedance supply path and minimize voltage droop across die |
| 20 | A/B | Global select line - controls all four multiplexers simultaneously to choose A or B input source |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs on left side (pins 1–8), outputs on right side (pins 10–13), enabling straight PCB trace routing without layer jumps |
| Center-pin VCC/GND | VCC (pins 18–19) and GND (pins 14–17) centered in package - suppresses simultaneous switching noise by balancing return current paths |
| 3-state bus interface | Outputs enter high-impedance state when OE = high - allows direct connection to shared data buses without contention |
| 500-mA latch-up immunity | Rated per JEDEC JESD78 Class II - ensures reliability in thermally stressed industrial and automotive-adjacent environments |
| Low dynamic power | Cpd = 11 pF (disabled), 37 pF (enabled) - reduces switching power in battery-sensitive or thermally constrained designs |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Signal Routing |
|---|---|
Use Scenario: Multiplexing sensor data streams from multiple analog front-ends into a single ADC interface within a modular I/O rack. IC Role / Device Role / Timing Role: Data selector routing four independent 2-source channels to shared bus lines under microcontroller control. Use Value: Eliminates need for discrete logic gates or larger CPLDs while maintaining <6.4 ns timing integrity across all four paths. |
Use Scenario: Switching stimulus signals between multiple DUT ports and measurement instruments in automated test fixtures. IC Role / Device Role / Timing Role: High-speed bidirectional signal path selector with guaranteed tri-state isolation during reconfiguration. Use Value: Enables glitch-free channel switching via OE control, with center-pin power/ground reducing measurement noise floor by >3 dB. |
| Communications Backplane Bus Arbitration | Embedded Controller Peripheral Multiplexing |
Use Scenario: Selecting between redundant Ethernet PHY outputs or serial management interfaces on a telecom backplane. IC Role / Device Role / Timing Role: Bus interface multiplexer providing failover path selection with sub-7 ns propagation and bus-isolation capability. Use Value: Supports hot-swap-safe arbitration using OE-driven Hi-Z transitions, avoiding bus contention during switchover. |
Use Scenario: Sharing limited GPIO or UART lines among multiple peripherals (e.g., EEPROM, RTC, sensor hub) on a resource-constrained MCU board. IC Role / Device Role / Timing Role: Logic-level signal router enabling time-shared peripheral access without software overhead. Use Value: Reduces required MCU pins by 4× while maintaining deterministic latency (<6.4 ns) and eliminating software polling delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC157DR | Quad 2:1 mux with separate select per channel; no shared A/B line; 16-pin SOIC | Requires individual select control per channel - less compact for synchronized routing | Choose when independent channel selection is required over global A/B control |
| 74LVC157APW | Lower VCC range (1.65–3.6 V); 3.3-V optimized; 20-pin TSSOP; tPD ≈ 5.2 ns | Not suitable for 5-V systems; higher speed but incompatible supply domain | Choose only for 3.3-V-only designs where 5-V tolerance is unnecessary |
Compared with SN74AC157DR and 74LVC157APW, the 74AC11257PWRE4 uniquely provides global A/B selection with center-pin power/ground and 5-V compatibility - making it optimal for synchronized bus multiplexing in mixed-voltage industrial controllers.
Availability
74AC11257PWRE4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital test equipment signal routing, and communications backplane bus arbitration requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for 74AC11257PWRE4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74AC11257PWRE4 belongs to TI's AC-series advanced CMOS logic family, designed for high-speed, low-noise digital signal routing in industrial control and test equipment where timing predictability and bus compatibility are critical.
FAQ
What is the recommended power-up sequence for 74AC11257PWRE4 to avoid bus contention?
TI recommends tying OE to VCC through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power-up. This prevents unintended data loading onto the bus before system initialization completes. The 74AC11257PWRE4 does not include internal power-on reset, so external OE biasing is mandatory for glitch-free startup in shared-bus systems.
Does 74AC11257PWRE4 support mixed-voltage operation between input and output sides?
No - the 74AC11257PWRE4 operates as a single-supply device with all I/O referenced to the same VCC (3–5.5 V). Input thresholds scale with VCC, and outputs swing rail-to-rail within that supply. It does not support level-shifting; for mixed-voltage interfacing, external translators or series resistors are required. The 74AC11257PWRE4 specification assumes unified supply domain.
How many ground and power pins does 74AC11257PWRE4 have, and why is this significant?
The 74AC11257PWRE4 has four dedicated GND pins (14–17) and two dedicated VCC pins (18–19), arranged centrally in the TSSOP package. This configuration lowers ground impedance, balances return current paths, and minimizes simultaneous switching noise - a key design feature confirmed in TI's SCAS049C datasheet to enhance signal integrity in high-speed digital systems using the 74AC11257PWRE4.
Can 74AC11257PWRE4 be used in place of 74AC157 in existing designs?
No - the 74AC11257PWRE4 is functionally distinct: it uses one global A/B select line for all four multiplexers, whereas the 74AC157 has individual select lines per channel and different pinout. Substituting 74AC11257PWRE4 requires PCB layout changes and firmware updates to accommodate shared selection. Direct replacement is not supported per TI's functional documentation for the 74AC11257PWRE4.
What is the maximum clock/data rate supported by 74AC11257PWRE4 in a synchronous bus application?
Based on its worst-case propagation delay of 7.9 ns (tPHL at VCC = 5 V, TA = 85°C) and setup/hold margins implied by AC electrical characteristics, the 74AC11257PWRE4 supports reliable operation up to approximately 80 MHz in synchronous bus configurations. This limit derives from measured tPLH/tPHL and output enable/disable timing (tPZL/tPHZ ≤ 8.6 ns), as specified in the official 74AC11257PWRE4 datasheet revision May 2004.
74AC11257PWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 24mA, 24mA
- Voltage Supply Source:
- Dual Supply
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74AC11257PWRE4 FAQ
1.How can I place an order for 74AC11257PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11257PWRE4 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 74AC11257PWRE4 reliable?
The price and inventory of 74AC11257PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11257PWRE4 is usually 5 days.
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Once your 74AC11257PWRE4 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 74AC11257PWRE4?
For technical support, including 74AC11257PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11257PWRE4 requirements.
6.How does Aetrix verify that 74AC11257PWRE4 is sourced from the original manufacturer or authorized distributors?
All 74AC11257PWRE4 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 74AC11257PWRE4 meets industry standards.
7.What is the process for return or replacement of 74AC11257PWRE4?
All 74AC11257PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11257PWRE4, 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 74AC11257PWRE4 part is unused and in its original packaging.
Return procedure for 74AC11257PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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