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Texas Instruments CY74FCT2257CTSOCT
- Part No.:
- CY74FCT2257CTSOCT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT2257CTSOCT.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:31,700
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Product details
Overview
CY74FCT2257CTSOCT from Texas Instruments is a quad 2-input multiplexer with 3-state outputs in SOIC-16 package, operating at 5 V with 4.7 ns max propagation delay (S→Y), ±15 mA output drive, and integrated 25-Ω series termination resistors. It serves as a logic-controlled 4-pole, 2-position switch in bus-multiplexing and data-routing applications within industrial control and legacy TTL-compatible systems.
For engineers reviewing the CY74FCT2257CTSOCT datasheet, CY74FCT2257CTSOCT pinout, CY74FCT2257CTSOCT application, or CY74FCT2257CTSOCT equivalent, key selection criteria include its Ioff-enabled partial-power-down capability, TTL-compatible input/output voltage thresholds, 3-state output enable timing (tPZH/tPLZ ≤ 6 ns), and SOIC-16 footprint compatibility with FCT-family designs.
Technical Context
The CY74FCT2257CTSOCT implements four independent 2:1 multiplexers sharing one common select (S) and one active-low output-enable (OE) signal. Each channel routes either I0a–I0d or I1a–I1d to Ya–Yd based on S logic level, with noninverted output polarity and simultaneous 3-state control via OE.
Its edge-rate control circuitry and on-die 25-Ω series output resistors suppress transmission-line reflections in high-speed PCB traces. The Ioff feature disables all outputs when VCC = 0 V, preventing backflow current during partial power-down-critical for hot-swap and mixed-voltage system interoperability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation across industrial-grade 5 V rails with ±5% tolerance. |
| Propagation Delay (S→Y) | 1.5 ns (min) to 5.2 ns (max) - enables reliable 190+ MHz switching in synchronous data paths. |
| Output Drive | ±15 mA - supports direct interfacing with TTL loads and fan-out of ≥20 LS-TTL inputs. |
| Ioff Current | ±1 µA at VCC = 0 V - guarantees safe isolation during power sequencing without external blocking diodes. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - fully compatible with standard TTL logic levels for seamless integration. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC 22 requirements for robust board-level handling. |
| Package Thermal Resistance | θJA = 57°C/W (SOIC) - allows sustained operation up to 85°C ambient without forced cooling. |
Pinout & Package
SOIC-16 package (JEDEC MS-012AC, 3.9 mm body width, 1.27 mm pitch), 1.75 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 12, 13, 14 | Data Input (I0a–I0d, I1a–I1d) | Two sets of four parallel data inputs per multiplexer channel; routed to output based on S state. |
| 2, 6, 10, 15 | Data Output (Ya–Yd) | Noninverted 3-state outputs with integrated 25-Ω series termination for reflection damping. |
| 3 | Common Select (S) | Global 2:1 selection control: low → I0 selected, high → I1 selected across all four channels. |
| 11 | Output Enable (OE) | Active-low global 3-state control: high → outputs in high-Z, low → outputs enabled per S logic. |
| 8 | GND | Power ground reference for logic and output drivers; must be low-impedance connection. |
| 16 | VCC | 5 V supply for internal logic and output buffers; requires local 0.1 µF decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω Output Series Resistors | Reduces signal reflections on PCB traces >10 cm, eliminating need for external series termination resistors. |
| Ioff Partial-Power-Down Support | Enables safe insertion/removal in live backplanes by disabling outputs when VCC is unpowered. |
| TTL-Compatible Logic Levels | Accepts standard TTL VIH/VIL thresholds and drives TTL loads directly-no level-shifting required. |
| Edge-Rate Controlled Outputs | Slows edge transitions just enough to suppress EMI while maintaining 4.7 ns propagation delay for timing-critical paths. |
| 3-State Output Architecture | Allows multiple devices to share a common bus without contention when OE is deasserted. |
Applications
| Bus Multiplexing | Data Routing |
|---|---|
Use Scenario: Arbitrating between two microcontroller peripherals (e.g., UART and SPI) sharing a single memory-mapped address bus. IC Role / Device Role / Timing Role: Quad 2:1 selector routing parallel address/data lines under CPU control via S and OE signals. Use Value: Eliminates discrete logic or CPLD overhead; 4.7 ns delay preserves setup/hold margins in 20-MHz bus cycles. | Use Scenario: Switching sensor data streams (temperature, pressure, flow) into a shared ADC input channel. IC Role / Device Role / Timing Role: Analog front-end multiplexer controller-digital select logic driving analog switches via buffered outputs. Use Value: TTL-compatible inputs interface directly with MCU GPIO; 3-state outputs prevent crosstalk during channel transitions. |
| Legacy System Upgrade | Hot-Swappable Module Interface |
Use Scenario: Replacing obsolete 74F257 in industrial PLC I/O modules requiring noise immunity and drop-in fit. IC Role / Device Role / Timing Role: Pin- and function-compatible upgrade with enhanced ESD and reflection suppression. Use Value: Same SOIC-16 footprint and logic behavior, but 25-Ω series resistors reduce radiated emissions by >6 dBµV/m. | Use Scenario: Enabling hot-plug capability in modular test equipment where daughterboards connect/disconnect under power. IC Role / Device Role / Timing Role: Isolation gate for control signals between mainframe and module-OE tied to presence detect. Use Value: Ioff blocks backfeed current when module is removed, protecting powered-backplane logic from latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F257N | No Ioff, no output series resistors, higher ICC (2.4 mA typical), 7 ns max tPHL. | Lacks partial-power-down support and reflection control-unsuitable for hot-swap or high-noise environments. | Select only for cost-sensitive, static-board applications where noise and power sequencing are not concerns. |
| 74ACT257SCX | 3.3 V–5.5 V supply range, 12 ns max tPHL, no integrated termination, higher VOH (4.4 V min). | Broad voltage compatibility but slower speed and no built-in line matching-requires external termination. | Prefer when interfacing mixed-voltage systems, but add 22–33 Ω series resistors and verify timing margins. |
Compared with SN74F257N and 74ACT257SCX, CY74FCT2257CTSOCT uniquely combines 5 V TTL compatibility, sub-5 ns propagation, integrated 25-Ω termination, and Ioff-making it optimal for noise-sensitive, hot-pluggable, or legacy-replacement designs where board space and reliability are prioritized over wide-VCC flexibility.
Availability
CY74FCT2257CTSOCT is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment upgrades, and modular test instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for CY74FCT2257CTSOCT 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade performance.
The CY74FCT2257CTSOCT belongs to TI's FCT logic family-designed specifically for noise-immune, TTL-compatible digital interfacing in industrial automation, telecom infrastructure, and military/aerospace subsystems.
FAQ
What is the maximum operating temperature range for CY74FCT2257CTSOCT?
The CY74FCT2257CTSOCT is rated for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated across all electrical parameters in the datasheet, including propagation delay, output drive, and Ioff leakage. The SOIC-16 package's 57°C/W thermal resistance ensures junction temperature remains within safe limits under typical load conditions at 85°C ambient.
Does CY74FCT2257CTSOCT support hot-swap operation?
Yes, CY74FCT2257CTSOCT supports hot-swap operation via its Ioff feature. When VCC is disconnected or at 0 V, the Ioff circuitry limits output leakage to ±1 µA-even with valid logic voltages applied to I/O pins. This prevents damaging back-current flow into a powered-down device, enabling safe insertion and removal in live backplane or modular systems without system reset.
Can CY74FCT2257CTSOCT replace older 74F257 devices directly?
Yes, CY74FCT2257CTSOCT is functionally and pinout-compatible with 74F257 in SOIC-16 packages and operates with identical logic levels and timing conventions. Its added benefits-25-Ω output series resistors, improved noise characteristics, and Ioff-make it a drop-in upgrade that enhances reliability without requiring PCB changes or firmware updates.
What is the purpose of the 25-Ω series resistors in CY74FCT2257CTSOCT outputs?
The 25-Ω series resistors integrated into each CY74FCT2257CTSOCT output are designed to match typical PCB trace impedance (50–75 Ω) and dampen signal reflections. This eliminates the need for external series termination resistors, reduces EMI, improves signal integrity on traces longer than 10 cm, and simplifies layout-especially in dense industrial control boards where routing constraints limit discrete component placement.
How does the output-enable (OE) pin behave in CY74FCT2257CTSOCT?
The OE pin in CY74FCT2257CTSOCT is active-low: when OE is high, all four outputs (Ya–Yd) enter high-impedance (3-state) mode regardless of S or input states; when OE is low, outputs respond to S and I0/I1 inputs. Propagation delays from OE to output disable (tPZL/tPZH) are guaranteed ≤6 ns, ensuring precise bus arbitration timing in multi-device systems.
CY74FCT2257CTSOCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 15mA, 12mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CY74FCT2257CTSOCT FAQ
1.How can I place an order for CY74FCT2257CTSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2257CTSOCT 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 CY74FCT2257CTSOCT reliable?
The price and inventory of CY74FCT2257CTSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2257CTSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT2257CTSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2257CTSOCT transactions.
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4.How is shipping managed for CY74FCT2257CTSOCT?
CY74FCT2257CTSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2257CTSOCT 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 CY74FCT2257CTSOCT?
For technical support, including CY74FCT2257CTSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2257CTSOCT requirements.
6.How does Aetrix verify that CY74FCT2257CTSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT2257CTSOCT 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 CY74FCT2257CTSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT2257CTSOCT?
All CY74FCT2257CTSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2257CTSOCT, 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 CY74FCT2257CTSOCT part is unused and in its original packaging.
Return procedure for CY74FCT2257CTSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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