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Texas Instruments CY74FCT2257CTSOC
- Part No.:
- CY74FCT2257CTSOC
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT2257CTSOC.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,195
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Product details
Overview
CY74FCT2257CTSOC from Texas Instruments is a quad 2-input multiplexer with 3-state outputs, designed for data routing in TTL-compatible digital systems. It features 4.7 ns propagation delay (max), 25-Ω on-chip output series resistors, ±1 µA Ioff current at VCC = 0 V, and operates across –40°C to +85°C. It serves as a logic-level four-pole, two-position switch in bus interface and signal selection circuits.
For engineers reviewing the CY74FCT2257CTSOC datasheet, CY74FCT2257CTSOC pinout, CY74FCT2257CTSOC application, or CY74FCT2257CTSOC equivalent, key selection criteria include its 3-state output control timing (tPZH/tPLZ ≤ 6 ns), Ioff-enabled partial-power-down capability, 12 mA sink / 15 mA source drive strength, and SOIC-16 package compatibility with legacy FCT logic designs.
Technical Context
The CY74FCT2257CTSOC implements four independent 2:1 multiplexers sharing one common select (S) and one active-low output-enable (OE) input. Each channel routes either I0x or I1x to Yx based on S logic level, with noninverted output polarity and simultaneous 3-state control via OE.
Its edge-rate control circuitry and integrated 20–40 Ω output series resistors suppress transmission-line reflections, while the Ioff specification ensures safe operation during partial power-down by blocking reverse current flow when VCC = 0 V and outputs are biased to 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | Max 4.7 ns at VCC = 4.75 V - enables high-speed data switching in 25-MHz+ bus applications. |
| Output Drive Strength | 12 mA sink / 15 mA source - sufficient to directly drive standard TTL loads without external buffers. |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging backflow during hot-insertion or mixed-voltage system power sequencing. |
| Supply Voltage Range | 4.75 V to 5.25 V - tightly regulated 5-V operation compatible with legacy TTL and FCT logic families. |
| Input Thresholds (VIH/VIL) | 2.0 V / 0.8 V - fully compatible with TTL input voltage levels, eliminating level-shifting requirements. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for robust board-level handling. |
| Output Termination | 20–40 Ω series resistance - reduces signal overshoot/ringing on PCB traces up to 10 cm without external resistors. |
Pinout & Package
Package: SOIC-16 (SO), body width 3.9 mm, lead pitch 1.27 mm, RoHS-compliant NiPdAu finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 12, 13, 14, 15 | Data inputs (I0a–I0d, I1a–I1d) | Two independent data buses per multiplexer; I0 selected when S = L, I1 when S = H. |
| 2, 3, 10, 11 | Outputs (Ya–Yd) | 3-state noninverted outputs; high-impedance when OE = H, driven otherwise. |
| 6 | Common select (S) | Global 2:1 selection control for all four channels; determines source bus routing. |
| 7 | Output-enable (OE) | Active-low global enable; forces all outputs into high-Z state when asserted. |
| 8 | GND | Power return reference for logic and output stages; must be low-inductance connection. |
| 16 | VCC | 5-V supply input; decoupling capacitor (0.1 µF) required within 1 cm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 25-Ω output series resistors | Reduces PCB trace reflection noise without requiring external termination components. |
| Ioff partial-power-down support | Enables safe operation in mixed-power-domain systems where VCC may be unpowered while I/O pins remain active. |
| TTL-compatible input/output levels | Eliminates need for level translators when interfacing with legacy 5-V TTL, LS, or FCT logic families. |
| Edge-rate controlled outputs | Minimizes simultaneous switching noise (SSN) and EMI in dense digital layouts. |
| Function and pinout compatibility with FCT257T | Allows drop-in replacement in existing designs to improve signal integrity without layout changes. |
Applications
| Bus Multiplexing | Signal Routing |
|---|---|
|
Use Scenario: Selecting between two parallel data sources (e.g., CPU and DMA controller) onto a shared memory bus. IC Role / Device Role / Timing Role: Quad 2:1 data selector enabling time-shared access to a single 4-bit data path. Use Value: Eliminates need for discrete logic gates or larger mux ICs; 4.7 ns delay ensures cycle-time compliance in 20-MHz bus systems. |
Use Scenario: Dynamically reconfiguring test signal paths in automated test equipment (ATE) front-end modules. IC Role / Device Role / Timing Role: Low-latency analog/digital signal selector with 3-state isolation between test channels. Use Value: Ioff protection prevents backfeed during channel switching; 25-Ω outputs reduce settling time on 50-Ω coaxial lines. |
| Legacy System Upgrade | Hot-Swap Interface |
|
Use Scenario: Replacing obsolete FCT257T in industrial PLC I/O modules to reduce signal integrity issues. IC Role / Device Role / Timing Role: Pin-compatible functional upgrade delivering improved noise immunity and ESD robustness. Use Value: Same PCB footprint and logic behavior, but with 2000-V HBM ESD rating and built-in termination resistors. |
Use Scenario: Enabling safe insertion/removal of peripheral cards in backplane-based telecom line cards. IC Role / Device Role / Timing Role: Isolation element controlling data path enablement during card presence detection sequences. Use Value: Ioff blocks current flow when VCC is absent, preventing damage to powered backplane logic during hot-swap events. |
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 |
|---|---|---|---|
| SN74FCT257NSR | Same FCT family, identical pinout and function, but rated for –40°C to +85°C only; no Ioff spec listed. | Lacks Ioff support - unsuitable for partial-power-down or hot-swap scenarios requiring backflow prevention. | Select CY74FCT2257CTSOC when Ioff protection and enhanced ESD (2000-V HBM) are required. |
| 74ACT257SCX | ACT-family device; 5-V supply, TTL-compatible inputs, but higher ICC (1.4 mA typical) and no on-chip termination resistors. | Higher static power and no built-in line-noise suppression - requires external 25-Ω series resistors for clean edges. | Choose CY74FCT2257CTSOC for lower power, reduced BOM count, and superior noise performance in space-constrained designs. |
Compared with SN74FCT257NSR and 74ACT257SCX, the CY74FCT2257CTSOC uniquely combines Ioff-enabled power sequencing safety, integrated 25-Ω output termination, and industry-leading 2000-V HBM ESD protection - all in a pin-identical SOIC-16 package.
Availability
CY74FCT2257CTSOC is available at Aetrix Electronics and suitable for industrial control systems, legacy logic upgrades, and telecom interface modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for CY74FCT2257CTSOC 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, with over 50 years of innovation in high-reliability digital interface components.
The CY74FCT2257CTSOC belongs to TI's FCT logic family, engineered for noise-immune, TTL-compatible data routing in industrial, telecom, and computing infrastructure where signal integrity and power sequencing robustness are critical.
FAQ
What is the maximum operating temperature range for the CY74FCT2257CTSOC?
The CY74FCT2257CTSOC is specified for continuous operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and applies to all electrical and switching parameters in the official SCCS038B datasheet. Operation outside this range may result in parametric degradation or functional failure.
Does the CY74FCT2257CTSOC support partial-power-down mode?
Yes, the CY74FCT2257CTSOC supports partial-power-down mode via its Ioff feature. When VCC = 0 V and any output is biased to 4.5 V, the Ioff circuitry limits reverse current to ±1 µA, preventing damaging backflow. This capability is explicitly verified in the absolute maximum ratings and electrical characteristics tables of the CY74FCT2257T datasheet.
Is the CY74FCT2257CTSOC pin-compatible with the original FCT257T device?
Yes, the CY74FCT2257CTSOC is functionally and pinout-compatible with the FCT257T, as confirmed in the "Function and Pinout Compatible With FCT and F Logic" statement in the datasheet. Both devices use identical SOIC-16 pin assignments, logic behavior, and timing specifications - enabling direct replacement in legacy designs.
What is the purpose of the 25-Ω output series resistors in the CY74FCT2257CTSOC?
The 25-Ω output series resistors in the CY74FCT2257CTSOC are integrated to dampen transmission-line reflections on PCB traces, reducing overshoot, undershoot, and ringing. This eliminates the need for external series termination resistors in most 50-Ω or 75-Ω trace environments, simplifying layout and improving signal fidelity in high-speed digital interfaces.
What are the key ESD protection ratings for the CY74FCT2257CTSOC?
The CY74FCT2257CTSOC exceeds JEDEC JESD22 standards with 2000-V Human-Body Model (HBM), 200-V Machine Model (MM), and 1000-V Charged-Device Model (CDM) ESD protection. These values are measured and documented in the "ESD Protection" section of the SCCS038B datasheet and reflect TI's production-tested reliability for handling and assembly environments.
CY74FCT2257CTSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
CY74FCT2257CTSOC FAQ
1.How can I place an order for CY74FCT2257CTSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2257CTSOC 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 CY74FCT2257CTSOC reliable?
The price and inventory of CY74FCT2257CTSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2257CTSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT2257CTSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2257CTSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2257CTSOC?
CY74FCT2257CTSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2257CTSOC 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 CY74FCT2257CTSOC?
For technical support, including CY74FCT2257CTSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2257CTSOC requirements.
6.How does Aetrix verify that CY74FCT2257CTSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT2257CTSOC 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 CY74FCT2257CTSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT2257CTSOC?
All CY74FCT2257CTSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2257CTSOC, 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 CY74FCT2257CTSOC part is unused and in its original packaging.
Return procedure for CY74FCT2257CTSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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