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Texas Instruments CY74FCT157CTSOC
- Part No.:
- CY74FCT157CTSOC
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT157CTSOC.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,944
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Product details
Overview
CY74FCT157CTSOC from Texas Instruments is a quad 2-input multiplexer with 3-state outputs in SOIC-16 package, operating at 4.75–5.25 V, with 4.3 ns max propagation delay (tPLH/tPHL), ±32 mA output drive, and Ioff support for partial-power-down mode. It selects four parallel data bits from two sources under a common select (S) and active-low enable (E), used in bus multiplexing and function generation in industrial control logic.
For engineers reviewing the CY74FCT157CTSOC datasheet, CY74FCT157CTSOC pinout, CY74FCT157CTSOC application, or CY74FCT157CTSOC equivalent, key selection criteria include its TTL-compatible input thresholds, 3.3 V typical VOH, matched rise/fall times, ESD robustness (2000-V HBM), and SOIC-16 footprint compatibility with legacy FCT logic families.
Technical Context
The CY74FCT157CTSOC implements four independent 2:1 multiplexers sharing one common select (S) and one active-low output-enable (E) input. Each channel routes either I0x or I1x to Yx based on S, with outputs forced low when E is high - enabling clean bus isolation.
It features edge-rate control circuitry to suppress switching noise, Ioff protection that disables outputs during power-down to prevent backflow current, and full TTL-level compatibility on both inputs and outputs - allowing seamless interfacing with legacy 5 V logic systems without level translation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - ensures stable operation across industrial 5 V rails with ±5% tolerance. |
| Propagation Delay (max) | 4.3 ns - enables high-speed data routing in synchronous bus architectures up to ~200 MHz toggle rate. |
| Output Drive | ±32 mA - supports direct driving of multiple TTL loads or termination-resistor networks without buffers. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - fully compatible with standard TTL logic levels for plug-in replacement. |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging back-current during hot-insertion or partial power-down sequences. |
| ESD Protection | 2000-V HBM - meets industrial-grade reliability requirements without external protection diodes. |
| Operating Temperature | –40°C to +85°C - qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
Package: SOIC-16 (DW), body size 10.3 mm × 6.5 mm, 1.27 mm pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Active-low output enable | Drives all Y outputs low when high; enables 3-state operation 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 | First bit of second data group routed to Ya when S = H. |
| 5 (Ya) | Noninverted output A | 3-state output reflecting selected I0a/I1a; high-impedance 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 | Second bit of second data group routed to Yb when S = H. |
| 8 (Yb) | Noninverted output B | 3-state output reflecting selected I0b/I1b; high-impedance when E = H. |
| 9 (GND) | Ground reference | Primary return path for logic and output currents; must be low-inductance connection. |
| 10 (VCC) | Positive supply | 5 V nominal supply; bypassing with 0.1 µF ceramic capacitor near pin required. |
| 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 | Third bit of second data group routed to Yc when S = H. |
| 13 (Yc) | Noninverted output C | 3-state output reflecting selected I0c/I1c; high-impedance 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 | Fourth bit of second data group routed to Yd when S = H. |
| 16 (Yd) | Noninverted output D | 3-state output reflecting selected I0d/I1d; high-impedance when E = H. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dV/dt, easing EMC compliance in dense PCB layouts. |
| Ioff partial-power-down support | Enables safe operation in mixed-voltage systems where VCC may be unpowered while other rails remain active. |
| TTL-compatible input thresholds | Eliminates need for level shifters when interfacing with legacy 5 V microcontrollers, FPGAs, or ASICs. |
| Matched rise/fall times | Minimizes duty-cycle distortion in clock/data paths, critical for timing-critical bus arbitration logic. |
| 3.3 V typical VOH at 5 V supply | Provides margin for downstream 3.3 V CMOS inputs while maintaining 5 V system compatibility. |
Applications
| Industrial PLC Backplane Multiplexing | Legacy Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Routing sensor data from dual analog input modules onto a shared 4-bit status bus in a programmable logic controller. IC Role / Device Role / Timing Role: Quad 2:1 selector synchronizing four parallel channels under a single S/E control pair, acting as a hardware-configurable data switch. Use Value: Reduces PCB layer count by consolidating two 4-bit buses into one, with deterministic 4.3 ns latency and no software overhead. |
Use Scenario: Expanding limited GPIO on an 8051-based motor controller to manage eight discrete I/O lines via time-multiplexed access. IC Role / Device Role / Timing Role: Logic-level bus selector enabling two banks of four outputs to share four MCU pins, coordinated by timer-driven S/E toggling. Use Value: Doubles effective I/O count without adding serial interface complexity or firmware latency. |
| Test Equipment Signal Routing | Automotive Body Control Module Logic |
|
Use Scenario: Switching between calibration and production firmware test vectors on a boundary-scan-enabled JTAG chain using shared TDI/TDO lines. IC Role / Device Role / Timing Role: Bidirectional signal multiplexer isolating test and operational paths with 3-state control during reconfiguration. Use Value: Enables in-system reprogramming without physical connector swapping or relay-based switching. |
Use Scenario: Selecting between dashboard display driver outputs and diagnostic LED patterns in a vehicle body control unit. IC Role / Device Role / Timing Role: Function generator implementing 4 of 16 2-variable Boolean functions (e.g., AND/OR/XOR) for lighting state logic. Use Value: Replaces discrete gate arrays with a single 16-pin IC, reducing BOM cost and board space by >60%. |
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 |
|---|---|---|---|
| CY74FCT157ATSOC | Slower 5 ns max propagation delay; same SOIC-16 package and pinout. | Lower-speed industrial control where <100 MHz toggle rates suffice. | Select when timing budget allows relaxed delay or when sourcing legacy stock. |
| SN74F157N | F-family variant: higher ICC (2 mA typical), no Ioff, no edge-rate control, 7 ns delay. | Legacy 5 V systems without partial-power-down or noise-sensitive layout constraints. | Use only if backward compatibility with obsolete F-series boards is mandatory. |
Compared with CY74FCT157ATSOC and SN74F157N, the CY74FCT157CTSOC delivers superior noise immunity, lower power consumption, and safer hot-swap behavior - making it the preferred choice for new designs requiring robust 5 V logic interfacing with modern EMI and power-management expectations.
Availability
CY74FCT157CTSOC is available at Aetrix Electronics and suitable for industrial PLC backplane multiplexing, legacy microcontroller bus expansion, test equipment signal routing, and automotive body control module logic requiring stable component supply across extended temperature ranges.
Supply support for CY74FCT157CTSOC 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 CY74FCT157CTSOC belongs to TI's FCT logic family - engineered for high-speed, low-noise 5 V TTL-compatible digital interfacing in mission-critical industrial and automotive systems.
FAQ
What is the maximum operating frequency supported by the CY74FCT157CTSOC?
The CY74FCT157CTSOC does not specify a maximum clock frequency, but its 4.3 ns propagation delay enables reliable operation in data paths with toggle rates up to approximately 200 MHz. System-level timing depends on load capacitance, trace routing, and input slew rate - design validation should verify setup/hold margins at the target frequency using the device's published tPLH/tPHL and tSU/tH values.
Does the CY74FCT157CTSOC support partial power-down mode?
Yes, the CY74FCT157CTSOC supports partial power-down mode via its Ioff feature. When VCC = 0 V, the Ioff circuitry limits input/output leakage to ±1 µA, preventing damaging back-current flow from live buses into the unpowered device - essential for hot-swap and mixed-rail system designs.
Is the CY74FCT157CTSOC pin-compatible with older 74F157 devices?
The CY74FCT157CTSOC is functionally and pin-compatible with the 74F157 and 74LS157 in SOIC-16 (DW) package, sharing identical pin assignments for E, S, I0x, I1x, and Yx signals. However, it adds Ioff, edge-rate control, and tighter VOH/VOL specs - no PCB changes are needed for drop-in replacement in most 5 V TTL systems.
What is the recommended bypass capacitor for the CY74FCT157CTSOC VCC pin?
A 0.1 µF ceramic capacitor placed as close as possible to the CY74FCT157CTSOC VCC pin (Pin 10) and GND (Pin 9) is recommended to suppress high-frequency switching noise and maintain stable supply voltage during output transitions. For systems with heavy bus loading, adding a bulk 4.7 µF tantalum or aluminum electrolytic capacitor nearby further improves low-frequency decoupling.
Can unused inputs on the CY74FCT157CTSOC be left floating?
No - all unused inputs on the CY74FCT157CTSOC must be tied to a valid logic level (VCC or GND) to ensure predictable operation and prevent increased ICC or oscillation. The datasheet explicitly requires this per Note 2 in Recommended Operating Conditions; floating inputs may cause excessive current draw or metastability in downstream logic.
CY74FCT157CTSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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
CY74FCT157CTSOC FAQ
1.How can I place an order for CY74FCT157CTSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT157CTSOC 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 CY74FCT157CTSOC reliable?
The price and inventory of CY74FCT157CTSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT157CTSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT157CTSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT157CTSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT157CTSOC?
CY74FCT157CTSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT157CTSOC 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 CY74FCT157CTSOC?
For technical support, including CY74FCT157CTSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT157CTSOC requirements.
6.How does Aetrix verify that CY74FCT157CTSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT157CTSOC 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 CY74FCT157CTSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT157CTSOC?
All CY74FCT157CTSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT157CTSOC, 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 CY74FCT157CTSOC part is unused and in its original packaging.
Return procedure for CY74FCT157CTSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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