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Texas Instruments CY74FCT2257CTQC
- Part No.:
- CY74FCT2257CTQC
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT2257CTQC.pdf
- Description:
- MUX, FCT SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:2,742
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Product details
Overview
CY74FCT2257CTQC from Texas Instruments is a quad 2-input multiplexer with 3-state outputs, designed for data routing in TTL- and FCT-compatible digital systems. It features 4.7 ns propagation delay (tPHL/tPLH), 25-Ω output series resistors for reflection noise suppression, ±15 mA output drive capability, and Ioff support for partial-power-down operation across –40°C to +85°C.
For engineers reviewing the CY74FCT2257CTQC datasheet, CY74FCT2257CTQC pinout, CY74FCT2257CTQC application, or CY74FCT2257CTQC equivalent, key selection criteria include 3-state bus interface compatibility, edge-rate controlled switching, TTL-level input/output interoperability, and QSOP-16 packaging for high-density PCB layouts.
Technical Context
This device implements four independent 2:1 multiplexers sharing one common select (S) and one active-low output-enable (OE) control line. 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 disable when OE is high.
It integrates on-die 25-Ω series termination at each output to damp transmission-line reflections, supports Ioff protection during partial power-down, and maintains full TTL-compatible voltage thresholds (VIH = 2 V min, VIL = 0.8 V max) while operating from 4.75–5.25 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.7 ns max (tPLH/tPHL, VCC = 5 V, CL = 50 pF) - enables sub-200 MHz data routing without timing closure issues. |
| Output Drive | ±15 mA (IOH/IOH) - sufficient to drive standard TTL loads and multiple CMOS inputs without external buffers. |
| Supply Voltage | 4.75–5.25 V - ensures stable operation within regulated 5-V rail tolerances and avoids undervoltage lockout. |
| Ioff Current | ±1 µA at VCC = 0 V - prevents backflow current when powered down, protecting upstream/downstream devices. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements for handling and board assembly. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees reliable recognition of TTL logic levels across temperature and voltage variation. |
| Output Termination | 25 Ω series resistor per output - reduces signal overshoot/ringing on PCB traces up to 10 cm without external components. |
Pinout & Package
Package: QSOP-16 (DBQ), 3.9 mm × 4.9 mm body, 0.635 mm pitch, gull-wing leads. RoHS-compliant, green (no Sb/Br), MSL Level-2 (260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 12, 13, 14, 15 | Data inputs (I0a, I1a, I0b, I1b, I0c, I1c, I0d, I1d) | Eight parallel data sources - two per multiplexer channel; routed to outputs based on S state. |
| 2, 6, 10, 11 | Outputs (Ya, Yb, Yc, Yd) | Four 3-state outputs - high-impedance when OE = high; driven low/high when enabled and selected. |
| 3 | Common select (S) | Global 2:1 selector - I0x active when S = low; I1x active when S = high (x = a–d). |
| 9 | Output-enable (OE) | Active-low global enable - all outputs enter high-Z simultaneously when OE = high. |
| 8 | GND | Power return reference - must be low-inductance connection to minimize ground bounce during switching. |
| 16 | VCC | +5 V supply - decoupling capacitor (0.1 µF ceramic) required within 5 mm for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Slower transition edges reduce EMI and crosstalk in dense routing environments without sacrificing speed. |
| On-chip 25-Ω series termination | Eliminates need for external series resistors on each output trace, saving board space and BOM cost. |
| Ioff partial-power-down support | Allows safe insertion/removal in live backplanes or hot-swap systems where VCC may be unpowered while other rails remain active. |
| TTL-compatible input/output levels | Direct interoperation with legacy 74LS/74ALS and modern FCT logic families without level-shifting circuitry. |
| 3-state bus interface capability | Enables shared data bus architectures - only one CY74FCT2257CTQC output enabled at a time to avoid contention. |
Applications
| Industrial PLC I/O Expansion | Legacy System Bus Multiplexing |
|---|---|
|
Use Scenario: Routing sensor data from dual analog front-end channels to a single ADC interface in programmable logic controllers. IC Role / Device Role / Timing Role: Quad 2:1 data selector synchronizing sampling paths under FPGA-controlled S/OE signals. Use Value: Reduces PCB layer count by consolidating four independent multiplexing functions into one QSOP-16 package with matched propagation delays. |
Use Scenario: Sharing a single microprocessor data bus among multiple peripheral modules in retro-computing or test equipment. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access to memory-mapped peripherals via OE-gated 3-state outputs. Use Value: Maintains TTL-level compatibility with vintage CPUs while suppressing signal reflections on long bus traces using integrated 25-Ω termination. |
| Automotive Diagnostic Interface | Communications Protocol Selector |
|
Use Scenario: Selecting between CAN and LIN transceiver data lines for multi-protocol vehicle diagnostic ports. IC Role / Device Role / Timing Role: Signal path selector isolating protocol-specific transceivers during reconfiguration sequences. Use Value: Ioff protection prevents backfeed from powered CAN/LIN transceivers into unpowered MCU I/O pins during sleep mode transitions. |
Use Scenario: Dynamically choosing between RS-232 and RS-485 physical layers in field-deployable serial gateways. IC Role / Device Role / Timing Role: Data-path arbiter routing UART TX/RX pairs to alternate transceiver ICs under firmware control. Use Value: Edge-rate control minimizes electromagnetic emissions near sensitive RF receivers, meeting CISPR 25 Class 3 limits. |
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 |
|---|---|---|---|
| SN74FCT257D | Same logic function and pinout, but no on-chip 25-Ω termination; higher output drive (±24 mA); faster propagation (3.5 ns typical). | Lacks built-in reflection suppression - requires external series resistors for clean signal integrity on >5 cm traces. | Choose when maximum speed is critical and board layout allows discrete termination. |
| 74ACT257SCX | ACT-family variant: 5-V supply only, VIH = 3.5 V min, lower ICC (0.05 mA typ), no Ioff support. | Not suitable for partial-power-down systems; incompatible with TTL input levels due to higher VIH threshold. | Choose only in fully powered, noise-tolerant 5-V-only designs with ACT-family ecosystem alignment. |
Compared with SN74FCT257D and 74ACT257SCX, the CY74FCT2257CTQC uniquely balances 3-state bus compatibility, integrated noise suppression, and Ioff safety - making it optimal for mixed-voltage, hot-swap, or high-reliability industrial interfaces where layout space and system-level robustness are constrained.
Availability
CY74FCT2257CTQC is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive diagnostic interfaces, legacy system bus multiplexing, and communications protocol selector applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for CY74FCT2257CTQC 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 90 years of innovation in industrial, automotive, and communications markets.
The CY74FCT2257CTQC belongs to TI's FCT logic family - engineered for noise-immune, TTL-compatible digital interfacing in mission-critical industrial and transportation systems where signal integrity and power-down safety are mandatory.
FAQ
What is the maximum operating temperature range for CY74FCT2257CTQC?
The CY74FCT2257CTQC is rated for continuous operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and supports deployment in industrial enclosures, automotive under-hood environments, and outdoor communication nodes without derating.
Does CY74FCT2257CTQC support hot-swap or partial-power-down operation?
Yes, CY74FCT2257CTQC includes Ioff circuitry that disables outputs and limits reverse current to ±1 µA when VCC = 0 V. This allows safe insertion into live backplanes or operation in systems where other rails remain powered while VCC is off - a key requirement for hot-swap controller interfaces.
What is the purpose of the 25-Ω series resistors on CY74FCT2257CTQC outputs?
The 25-Ω on-die series resistors in CY74FCT2257CTQC damp high-frequency signal reflections on PCB traces, reducing overshoot, undershoot, and ringing. They eliminate the need for external termination resistors on each output, simplifying layout and improving signal integrity for traces up to 10 cm in length.
Is CY74FCT2257CTQC pin-compatible with older 74FCT257 variants?
Yes, CY74FCT2257CTQC is functionally and pinout-compatible with industry-standard 74FCT257 devices including SN74FCT257D and CY74FCT257T. The QSOP-16 (DBQ) footprint matches SOIC-16 pin spacing, enabling drop-in replacement in existing designs with identical PCB layout.
What logic levels does CY74FCT2257CTQC accept and drive?
CY74FCT2257CTQC accepts TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and drives TTL-level outputs (VOH ≥ 2.4 V at –15 mA, VOL ≤ 0.55 V at 12 mA). It operates from 4.75–5.25 V and interfaces directly with 74LS, 74ALS, and other FCT-family logic without level shifters.
CY74FCT2257CTQC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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-SSOP
CY74FCT2257CTQC FAQ
1.How can I place an order for CY74FCT2257CTQC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2257CTQC 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 CY74FCT2257CTQC reliable?
The price and inventory of CY74FCT2257CTQC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2257CTQC is usually 5 days.
3.What payment methods are accepted for CY74FCT2257CTQC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2257CTQC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2257CTQC?
CY74FCT2257CTQC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2257CTQC 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 CY74FCT2257CTQC?
For technical support, including CY74FCT2257CTQC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2257CTQC requirements.
6.How does Aetrix verify that CY74FCT2257CTQC is sourced from the original manufacturer or authorized distributors?
All CY74FCT2257CTQC 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 CY74FCT2257CTQC meets industry standards.
7.What is the process for return or replacement of CY74FCT2257CTQC?
All CY74FCT2257CTQC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2257CTQC, 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 CY74FCT2257CTQC part is unused and in its original packaging.
Return procedure for CY74FCT2257CTQC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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