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Texas Instruments CY74FCT157CTQCT
- Part No.:
- CY74FCT157CTQCT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT157CTQCT.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,949
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Product details
Overview
CY74FCT157CTQCT 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, Ioff partial-power-down support, and operates across –40°C to +85°C. Used in bus multiplexing, register-to-bus data selection, and irregular logic synthesis.
For engineers reviewing the CY74FCT157CTQCT datasheet, CY74FCT157CTQCT pinout, CY74FCT157CTQCT application, or CY74FCT157CTQCT equivalent, key selection criteria include 3-state output control timing, sink/source current capability, Ioff-enabled power-down isolation, and SSOP-16 package compatibility with high-density PCB layouts.
Technical Context
The CY74FCT157CTQCT implements four independent 2:1 multiplexers sharing one common select (S) and active-low enable (E) input. Each channel routes either I0x or I1x to Yx based on S, with outputs disabled (high-impedance) when E is high.
Its FCT-family architecture delivers TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), 3.3 V typical VOH at 5 V supply, matched rise/fall times, and edge-rate control circuitry to suppress switching noise. Ioff protection activates when VCC = 0 V, limiting backflow current to ±1 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 4.3 ns max (at VCC = 5 V, CL = 50 pF) - ensures tight timing margins in 100+ MHz system buses |
| Output Drive (IOL/IOH) | 64 mA sink / 32 mA source - drives heavy capacitive loads or multiple TTL inputs without buffering |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging back-current during hot-insertion or partial power-down |
| Supply Voltage Range | 4.75 V to 5.25 V - tightly regulated 5 V operation compatible with legacy TTL and FCT logic rails |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - guarantees interoperability with standard TTL and CMOS logic families |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial ambient environments |
Pinout & Package
Package: SSOP-16 (DBQ), 4.4 mm × 5.3 mm body, 0.65 mm pitch, RoHS-compliant NIPDAU finish, MSL Level-2 (260°C, 1 year).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Active-low output enable | Drives all Y outputs to high-impedance when logic high; enables routing when low |
| 2 (S) | Common data select | Controls source selection (I0x or I1x) across all four channels simultaneously |
| 3 (I0a) | Data input A, source 0 | First bit of first data group routed to Ya when S = L |
| 4 (I1a) | Data input A, source 1 | Alternate first-bit input routed to Ya when S = H |
| 5 (Ya) | Noninverted output A | 3-state output reflecting selected I0a/I1a; high-Z when E = H |
| 6 (I0b) | Data input B, source 0 | Second bit of first data group routed to Yb when S = L |
| 7 (I1b) | Data input B, source 1 | Alternate second-bit input routed to Yb when S = H |
| 8 (Yb) | Noninverted output B | 3-state output reflecting selected I0b/I1b; high-Z when E = H |
| 9 (GND) | Ground reference | Primary return path for logic and output currents; decoupling critical for noise control |
| 10 (VCC) | Positive supply | 5 V nominal power rail; supports Ioff behavior when ramped to 0 V |
| 11 (I0c) | Data input C, source 0 | Third bit of first data group routed to Yc when S = L |
| 12 (I1c) | Data input C, source 1 | Alternate third-bit input routed to Yc when S = H |
| 13 (Yc) | Noninverted output C | 3-state output reflecting selected I0c/I1c; high-Z when E = H |
| 14 (I0d) | Data input D, source 0 | Fourth bit of first data group routed to Yd when S = L |
| 15 (I1d) | Data input D, source 1 | Alternate fourth-bit input routed to Yd when S = H |
| 16 (Yd) | Noninverted output D | 3-state output reflecting selected I0d/I1d; high-Z when E = H |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dV/dt, enabling cleaner signal integrity in dense layouts |
| Ioff partial-power-down | Enables safe operation in mixed-voltage or hot-swap systems where VCC may be unpowered while I/O pins remain active |
| FCT-family compatibility | Pin- and function-compatible with CY74FCT157T and CY54FCT157T, supporting drop-in upgrades within same package footprint |
| Matched rise/fall times | Minimizes duty cycle distortion in clock/data paths, critical for synchronous bus timing and jitter-sensitive applications |
| TTL-level input compatibility | Accepts standard TTL voltage thresholds without level-shifting, simplifying interface with legacy microcontrollers and peripherals |
Applications
| Bus Multiplexing | Register File Selection |
|---|---|
|
Use Scenario: Selecting between two 4-bit data buses (e.g., ALU result vs. memory read) onto a shared 4-bit CPU data bus. IC Role / Device Role / Timing Role: Quad 2:1 data selector with synchronized enable and select control; provides deterministic 4.3 ns routing latency. Use Value: Eliminates need for discrete gates or larger CPLDs, reducing component count and board area in 8-bit/16-bit embedded controllers. |
Use Scenario: Routing data from two independent 4-bit register banks (e.g., general-purpose vs. shadow registers) to a common arithmetic unit. IC Role / Device Role / Timing Role: Functionally acts as a 4-pole, 2-position logic switch; S determines source bank, E gates output validity. Use Value: Enables fast context switching in real-time interrupt handlers without software overhead or additional latch logic. |
| Function Generation | Industrial Control Logic |
|
Use Scenario: Implementing custom combinational logic (e.g., parity generator, state decoder) using 2-variable Boolean functions. IC Role / Device Role / Timing Role: Configured as a universal 2-input logic cell; S and one input serve as function select, I0x/I1x define truth table rows. Use Value: Replaces up to four 2-input gates per channel, lowering gate count and propagation delay in irregular logic blocks. |
Use Scenario: Isolating sensor input lines from a microcontroller during firmware updates or fault recovery sequences. IC Role / Device Role / Timing Role: 3-state output buffer with Ioff; E disables outputs and prevents backfeed when MCU is powered down. Use Value: Ensures signal integrity and prevents latch-up in safety-critical PLC modules operating across wide temperature ranges. |
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 |
|---|---|---|---|
| CY74FCT157CTSOC | SOIC-16 (DW) package, same electrical specs, tube packaging (40 pcs), no moisture sensitivity restriction | Better suited for low-volume prototyping or manual assembly due to wider lead spacing and tube format | Select when board layout allows SOIC footprint and reflow profile doesn't require MSL-2 compliance |
| SN74FCT157CTSOCT | Same function and speed, but manufactured by TI under SN74 prefix; identical pinout and DC specs, minor AC variance (<0.2 ns) | Approved for use in TI-designated reference designs and automotive-qualified BOMs where SN74 branding is required | Choose when sourcing alignment with TI's standard logic portfolio or for qualification traceability in Tier-1 supply chains |
Compared with CY74FCT157CTQCT, the CY74FCT157CTSOC offers easier hand-soldering and no MSL constraints but occupies more PCB area, while the SN74FCT157CTSOCT provides identical functionality with TI's mainstream branding-making it preferable for design reuse and long-term documentation consistency.
Availability
CY74FCT157CTQCT is available at Aetrix Electronics and suitable for industrial control systems, legacy bus interfaces, and embedded register-file architectures requiring stable component supply, extended temperature operation, and proven 5 V logic compatibility.
Supply support for CY74FCT157CTQCT 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 ICs.
The CY74FCT157CTQCT belongs to TI's FCT logic family, engineered for noise-immune, high-drive 5 V digital interfacing in industrial, computing, and communications equipment where TTL compatibility and power-down safety are essential.
FAQ
What is the maximum propagation delay of the CY74FCT157CTQCT at 5 V supply?
The CY74FCT157CTQCT has a maximum propagation delay of 4.3 ns (tPLH/tPHL) under recommended conditions (VCC = 4.75 V to 5.25 V, CL = 50 pF, TA = –40°C to +85°C). This value applies to both I→Y and S→Y paths and is measured with standard load and waveform definitions per the datasheet Figure 1 test setup.
Does the CY74FCT157CTQCT support partial power-down operation?
Yes, the CY74FCT157CTQCT supports partial power-down via its Ioff feature. When VCC = 0 V, the Ioff circuitry limits current flow through powered I/O pins to ±1 µA, preventing back-current damage during hot-swap or mixed-rail system operation. This behavior is fully characterized and guaranteed across temperature.
What package type is used for the CY74FCT157CTQCT?
The CY74FCT157CTQCT uses a 16-pin SSOP (Shrink Small Outline Package) with drawing code DBQ, measuring 4.4 mm × 5.3 mm with 0.65 mm lead pitch. It is RoHS-compliant with NIPDAU lead finish and rated MSL Level-2 (260°C, 1 year), requiring dry pack storage per JEDEC J-STD-020.
Can the CY74FCT157CTQCT drive standard TTL loads directly?
Yes, the CY74FCT157CTQCT is fully compatible with TTL input and output logic levels. Its VOH (min 2.4 V at IOH = –32 mA) and VOL (max 0.55 V at IOL = 64 mA) meet or exceed TTL specifications, and its VIH (2.0 V) and VIL (0.8 V) thresholds ensure reliable interfacing with legacy TTL devices without level shifters.
Is the CY74FCT157CTQCT pin-compatible with earlier FCT multiplexers?
Yes, the CY74FCT157CTQCT is functionally and pin-compatible with CY74FCT157T and CY54FCT157T in the same SSOP-16 package. It retains identical pinout, logic behavior, and DC/AC specifications-enabling direct replacement in existing designs while offering improved noise immunity via edge-rate control.
CY74FCT157CTQCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SSOP
CY74FCT157CTQCT FAQ
1.How can I place an order for CY74FCT157CTQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT157CTQCT 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 CY74FCT157CTQCT reliable?
The price and inventory of CY74FCT157CTQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT157CTQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT157CTQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT157CTQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT157CTQCT?
CY74FCT157CTQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT157CTQCT 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 CY74FCT157CTQCT?
For technical support, including CY74FCT157CTQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT157CTQCT requirements.
6.How does Aetrix verify that CY74FCT157CTQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT157CTQCT 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 CY74FCT157CTQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT157CTQCT?
All CY74FCT157CTQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT157CTQCT, 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 CY74FCT157CTQCT part is unused and in its original packaging.
Return procedure for CY74FCT157CTQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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