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Texas Instruments CY74FCT157CTD
- Part No.:
- CY74FCT157CTD
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT157CTD.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:406
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Product details
Overview
CY74FCT157CTD from Texas Instruments is a quad 2-input multiplexer with 3-state outputs, designed for data routing and function generation in TTL- and FCT-compatible digital systems. It features 4.3 ns propagation delay (max), ±32 mA output drive capability, and operates across –40°C to +85°C. Used in register-to-bus data selection, it enables dynamic source switching under common select (S) and active-low enable (E) control.
For engineers reviewing the CY74FCT157CTD datasheet, CY74FCT157CTD pinout, CY74FCT157CTD application, or CY74FCT157CTD equivalent, key selection criteria include its 3-state bus interface compatibility, Ioff partial-power-down support, matched rise/fall times, and SOIC-16 package suitability for industrial logic consolidation.
Technical Context
The CY74FCT157CTD implements four independent 2:1 multiplexers sharing one common select (S) and one active-low output-enable (E) input. Each Y output reflects I0a–I0d or I1a–I1d based on S state, with high-impedance when E = high. Its logic diagram confirms noninverting outputs and direct gate-level implementation without internal latching or clocking.
It uses FCT-family silicon with edge-rate control circuitry to reduce switching noise, supports TTL-level inputs (VIH = 2 V min, VIL = 0.8 V max), and includes Ioff protection enabling safe operation during partial power-down. Absolute maximum ratings allow VCC up to 5.5 V and input/output voltage range of –0.5 V to 7 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 4.3 ns max - ensures tight timing budget compliance in 25 MHz+ synchronous logic paths |
| Output Drive (IOL/IOH) | 64 mA sink / 32 mA source - drives heavy capacitive loads or multiple TTL inputs without buffering |
| Supply Voltage Range | 4.75 V to 5.25 V - tightly regulated 5 V operation compatible with legacy TTL and FCT logic rails |
| Ioff Current | ±1 µA at VCC = 0 V - prevents backflow current during system power sequencing or hot-swap scenarios |
| Input Thresholds | VIH = 2 V min, VIL = 0.8 V max - guarantees interoperability with standard TTL output levels |
| Power Dissipation (ICC) | 0.1–0.2 mA static - enables low-quiescent-power logic consolidation in battery-backed or thermally constrained modules |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial handling and board-level robustness requirements |
Pinout & Package
Package: SOIC-16 (D package), 7.5 mm × 10.3 mm body, 1.27 mm pitch, RoHS-compliant NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Active-low output enable | Forces all Y outputs into high-impedance state when high; enables concurrent bus sharing |
| 2 (I0a), 3 (I1a), 4 (Ya) | Data inputs and output for channel A | Ya = I0a if S = L, Ya = I1a if S = H - forms first 2:1 mux pair |
| 5 (I0b), 6 (I1b), 7 (Yb) | Data inputs and output for channel B | Yb follows same S-controlled logic as Ya - enables parallel 4-bit data routing |
| 8 (GND) | Ground reference | Primary return path for logic and output currents; must be low-inductance connection |
| 9 (VCC) | Positive supply | 5 V nominal supply; decoupling capacitor required within 1 cm for noise suppression |
| 10 (I0c), 11 (I1c), 12 (Yc) | Data inputs and output for channel C | Third independent 2:1 mux; identical timing and drive to Ya/Yb |
| 13 (I0d), 14 (I1d), 15 (Yd) | Data inputs and output for channel D | Fourth mux channel; completes quad configuration for full byte-wide selection |
| 16 (S) | Common data-select control | Single-pin global selection between two 4-bit sources - reduces control-line count vs. discrete muxes |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting di/dt - critical for mixed-signal PCB layouts |
| Matched rise/fall times | Ensures symmetrical waveform edges - minimizes duty-cycle distortion in clock/data distribution |
| FCT/TTL logic level compatibility | Accepts standard TTL VOH/VOL and drives TTL loads directly - eliminates level-shifter components |
| Partial-power-down support (Ioff) | Disables outputs at VCC = 0 V - allows safe insertion/removal in live backplane or modular systems |
| 3-state bus interface | Enables time-multiplexed sharing of common data buses among multiple devices - reduces trace count and layer usage |
Applications
| Register File Multiplexing | Bus Arbitration Interface |
|---|---|
Use Scenario: Selecting between two 4-bit register banks (e.g., accumulator vs. temporary storage) before writing to ALU input. IC Role / Device Role / Timing Role: Quad 2:1 data selector synchronizing register read-out under shared S and E control. Use Value: Reduces control logic overhead by using single S/E lines instead of four independent selects - saves FPGA LUTs or discrete gates. | Use Scenario: Arbitrating access to a shared 4-bit status bus among multiple peripheral controllers in an industrial PLC backplane. IC Role / Device Role / Timing Role: Bidirectional bus isolator enabling one controller at a time to drive the bus while others remain high-Z. Use Value: Eliminates need for discrete bus buffers or complex arbitration logic - simplifies layout and improves signal integrity via controlled edge rates. |
| Function Generator Logic | Legacy System Signal Routing |
Use Scenario: Implementing irregular combinational logic (e.g., custom parity or encoding functions) using 2-variable truth table mapping. IC Role / Device Role / Timing Role: Hardware-based LUT replacement generating any of 16 possible 2-input Boolean functions per channel. Use Value: Provides deterministic, zero-latency logic synthesis without software overhead - ideal for real-time safety-critical subsystems. | Use Scenario: Interfacing modern microcontrollers with legacy 5 V TTL peripherals (e.g., UART transceivers, display drivers) requiring precise voltage and timing alignment. IC Role / Device Role / Timing Role: Level- and timing-transparent signal router preserving TTL-compatible VOH/VOL and propagation delay. Use Value: Avoids level-shifter delays and voltage translation errors - maintains setup/hold timing margins in mixed-voltage designs. |
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 |
|---|---|---|---|
| SN74FCT157D | Same pinout, identical AC/DC specs, but rated only to 70°C ambient - lacks extended industrial temperature range | Suitable for commercial-grade boards where ambient stays below 70°C; not qualified for industrial control enclosures | Select when cost sensitivity outweighs temperature requirement and legacy FCT footprint is mandatory |
| 74ACT157SOIC | Higher VOH (≥4.4 V), lower IOL (24 mA), no Ioff - incompatible with partial-power-down systems | Better noise immunity in high-noise environments but cannot safely interface with powered-down subsystems | Choose for high-speed, noise-immune routing where all system blocks remain powered during operation |
Compared with SN74FCT157D and 74ACT157SOIC, the CY74FCT157CTD uniquely combines –40°C to +85°C operation, Ioff-enabled power sequencing, and FCT-standard 64 mA drive - making it the only option qualified for ruggedized embedded control and modular industrial hardware.
Availability
CY74FCT157CTD is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy-system upgrade kits, and aerospace avionics data concentrators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT157CTD 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 for industrial, automotive, and communications markets.
The CY74FCT157CTD belongs to TI's FCT logic family, engineered for high-noise-immunity 5 V digital interfacing in mission-critical systems where reliability, timing precision, and power sequencing safety are essential.
FAQ
What is the maximum operating temperature range for the CY74FCT157CTD?
The CY74FCT157CTD is specified for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per the recommended operating conditions table in the official TI datasheet SCCS014B, and applies to the SOIC-16 (D) package variant shipped as CY74FCT157CTD. Operation outside this range may result in parametric degradation or functional failure.
Does the CY74FCT157CTD support partial-power-down functionality?
Yes, the CY74FCT157CTD includes Ioff circuitry that disables all outputs when VCC = 0 V, limiting reverse current to ±1 µA. This feature allows safe insertion or removal in live backplanes and enables controlled power sequencing in multi-rail systems - a key differentiator from standard TTL or ACT logic variants.
What is the propagation delay specification for the CY74FCT157CTD?
The CY74FCT157CTD has a maximum propagation delay of 4.3 ns (tPLH/tPHL) from any data input (I0/I1) or select (S) input to output (Y), measured under VCC = 4.75 V to 5.25 V, CL = 50 pF, and TA = –40°C to +85°C. This value is confirmed in the "Switching Characteristics" table of the TI datasheet SCCS014B.
Is the CY74FCT157CTD pin-compatible with older FCT-series multiplexers?
Yes, the CY74FCT157CTD is function-, pin-, and drive-compatible with CY74FCT157T and SN74FCT157D in the same SOIC-16 package. The 'C' suffix denotes improved speed (4.3 ns vs. 5 ns), but pin assignments, logic behavior, and DC characteristics remain identical - enabling drop-in replacement in existing designs.
What package type and marking does the CY74FCT157CTD use?
The CY74FCT157CTD is supplied in a 16-pin SOIC (D) package with dimensions 7.5 mm × 10.3 mm, 1.27 mm pitch, and NIPDAU lead finish. Its top-side marking is "FCT157CT", as documented in TI's Package Option Addendum and verified across production lots.
CY74FCT157CTD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 32mA, 64mA
- 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
CY74FCT157CTD FAQ
1.How can I place an order for CY74FCT157CTD through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT157CTD 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 CY74FCT157CTD reliable?
The price and inventory of CY74FCT157CTD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT157CTD is usually 5 days.
3.What payment methods are accepted for CY74FCT157CTD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT157CTD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT157CTD?
CY74FCT157CTD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT157CTD 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 CY74FCT157CTD?
For technical support, including CY74FCT157CTD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT157CTD requirements.
6.How does Aetrix verify that CY74FCT157CTD is sourced from the original manufacturer or authorized distributors?
All CY74FCT157CTD 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 CY74FCT157CTD meets industry standards.
7.What is the process for return or replacement of CY74FCT157CTD?
All CY74FCT157CTD units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT157CTD, 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 CY74FCT157CTD part is unused and in its original packaging.
Return procedure for CY74FCT157CTD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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