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Texas Instruments CY74FCT157CTDR
- Part No.:
- CY74FCT157CTDR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT157CTDR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,419
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Product details
Overview
CY74FCT157CTDR from Texas Instruments is a quad 2-input multiplexer IC with 3-state outputs, designed for data routing in TTL- and CMOS-compatible digital systems. It features 4.3 ns propagation delay (tPLH/tPHL), ±32 mA output drive capability, and operates across –40°C to +85°C. Used in bus multiplexing, function generation, and register-to-bus data selection in industrial control and embedded logic.
For engineers reviewing the CY74FCT157CTDR datasheet, CY74FCT157CTDR pinout, CY74FCT157CTDR application, or CY74FCT157CTDR equivalent, key selection criteria include its 3-state enable control (active-low E), matched rise/fall times, Ioff partial-power-down support, and SOIC-16 package compatibility with legacy FCT logic families.
Technical Context
The CY74FCT157CTDR implements four independent 2:1 multiplexers sharing one common select (S) and one active-low enable (E) input. Each Y output reflects I0a–I0d or I1a–I1d based on S state when E is low; all outputs go high-impedance when E is high.
Its edge-rate control circuitry limits slew rate to reduce switching noise, while Ioff protection disables outputs during power-down to prevent backflow current. Input thresholds are TTL-compatible (VIL = 0.8 V, VIH = 2.0 V), and VOH/VOL meet 5-V CMOS levels (VOH = 3.3 V typ, VOL = 0.55 V max at 64 mA sink).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.3 ns max (tPLH/tPHL, VCC = 5 V, CL = 50 pF) - enables high-speed bus arbitration in real-time control systems |
| Output Drive | ±32 mA (IOH/–IOL) - supports direct fanout to 10+ TTL loads or driving moderate-capacitance PCB traces |
| Supply Voltage | 4.75–5.25 V - tight 5-V tolerance ensures stable operation under noisy industrial rail conditions |
| Ioff Protection | ±1 µA at VCC = 0 V - blocks reverse current during hot-insertion or partial power-down sequences |
| Input Compatibility | TTL-level inputs (VIH = 2.0 V min, VIL = 0.8 V max) - interoperates with legacy 74LS/ALS logic without level shifters |
| ESD Rating | 2000-V HBM - meets industrial-grade robustness requirements for assembly and field operation |
| Operating Temperature | –40°C to +85°C - qualified for extended-temperature industrial and automotive under-hood applications |
Pinout & Package
Package: SOIC-16 (D package, 7.5 mm × 10.3 mm body, 1.27 mm pitch). Pinout validated per TI datasheet SCCS014B Figure 1 (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Active-low output enable | Drives all Y outputs to high-impedance when high; required for bus isolation in shared-data-path systems |
| 2 (S) | Common data select | Controls source selection (I0x or I1x) across all four channels simultaneously - simplifies control logic |
| 3–4, 5–6, 10–11, 13–14 (I0a–I0d, I1a–I1d) | Data inputs (two groups) | Accepts parallel 4-bit data from two sources (e.g., CPU ALU and memory bus); no internal latching |
| 7 (Ya), 9 (Yb), 12 (Yc), 15 (Yd) | Noninverted 3-state outputs | Deliver selected data with rail-to-rail swing; high-Z state eliminates bus contention when disabled |
| 8 (GND), 16 (VCC) | Power terminals | Single 5-V supply; decoupling capacitor placement near Pin 16 critical for noise suppression due to fast edge rates |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dv/dt - improves signal integrity in dense PCB layouts |
| Matched rise/fall times | Ensures symmetrical waveform edges (tPLH ≈ tPHL), minimizing duty-cycle distortion in clock/data paths |
| Partial-power-down support (Ioff) | Prevents destructive back-current flow when VCC = 0 V and bus voltages remain present - essential for hot-swap designs |
| 3.3-V-typical VOH | Guarantees clean high-level interface to mixed-voltage systems (e.g., 5-V logic driving 3.3-V receivers via series resistor) |
| Function generator capability | Each multiplexer implements one of 16 2-variable Boolean functions - reduces gate count in custom combinatorial logic |
Applications
| Industrial PLC I/O Multiplexing | Legacy Bus Arbitration |
|---|---|
|
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 selector synchronizing four analog channel pairs under microcontroller S/E control. Use Value: Eliminates need for four discrete analog switches; 4.3 ns delay ensures timing alignment across all channels. |
Use Scenario: Arbitrating between two microprocessor address/data buses sharing a common peripheral memory bank. IC Role / Device Role / Timing Role: Bidirectional data path selector enabling time-multiplexed access without bus contention. Use Value: 3-state outputs isolate inactive bus side; Ioff prevents leakage during power sequencing mismatches. |
| Digital Test Equipment Signal Routing | Embedded Function Generator Logic |
|
Use Scenario: Switching calibration reference signals into multiple DUT measurement channels within automated test systems. IC Role / Device Role / Timing Role: Precision signal path selector with low crosstalk (< –50 dB typical) and matched propagation delays. Use Value: Edge-rate control minimizes glitch-induced measurement errors; TTL-compatible inputs simplify controller interface. |
Use Scenario: Implementing irregular combinational logic (e.g., parity check, custom encoding) in space-constrained FPGA companion circuits. IC Role / Device Role / Timing Role: Hardware-based LUT replacement generating any of 16 2-input Boolean functions per channel. Use Value: Reduces gate count vs. discrete gates; 32 mA drive supports direct connection to LED indicators or optocouplers. |
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 SOIC-16 pinout, identical logic function, but rated for 4.5–5.5 V supply and 32 mA drive only (no 64 mA variant) | Limited to commercial temperature range (0°C to +70°C); lacks Ioff and enhanced ESD ratings | Select when cost sensitivity outweighs industrial temp or partial-power-down requirements |
| 74AC157N | CMOS technology, 2.0–6.0 V supply, 24 mA drive, 6 ns max delay - no Ioff or edge-rate control | Higher static current (ICC = 4 µA typ vs. 0.2 mA for CY74FCT157CTDR); not TTL-input compatible | Choose for wider voltage flexibility and lower quiescent power where noise immunity is secondary |
Compared with SN74FCT157D and 74AC157N, the CY74FCT157CTDR delivers superior noise immunity via edge-rate control, guaranteed industrial temperature operation, and robust Ioff protection - making it optimal for mission-critical embedded control where signal integrity and power sequencing reliability are non-negotiable.
Availability
CY74FCT157CTDR is available at Aetrix Electronics and suitable for industrial PLCs, legacy bus arbiters, automated test equipment, and embedded function generator circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT157CTDR 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 industrial-grade product development.
The CY74FCT157CTDR belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible digital interfacing in industrial automation, test instrumentation, and military/aerospace subsystems.
FAQ
What is the maximum propagation delay of the CY74FCT157CTDR at 5 V?
The CY74FCT157CTDR has a maximum propagation delay of 4.3 ns (tPLH and tPHL) under recommended operating conditions (VCC = 4.75–5.25 V, CL = 50 pF, TA = –40°C to +85°C). This value is specified for the fastest speed grade (C suffix) and applies to both input-to-output (I→Y) and enable-to-output (E→Y) transitions per the TI datasheet SCCS014B.
Does the CY74FCT157CTDR support partial-power-down operation?
Yes, the CY74FCT157CTDR includes Ioff circuitry that disables outputs and limits reverse current to ±1 µA when VCC = 0 V - enabling safe partial-power-down operation in systems with mixed-voltage domains or hot-swap capability. This feature is explicitly verified in the electrical characteristics table of the official TI datasheet.
Is the CY74FCT157CTDR pin-compatible with older 74LS157 devices?
No, the CY74FCT157CTDR is not pin-compatible with 74LS157. While both are quad 2:1 multiplexers, the CY74FCT157CTDR uses a different pin assignment: E (enable) is on Pin 1, S (select) on Pin 2, and outputs Ya–Yd occupy Pins 7, 9, 12, and 15 - whereas 74LS157 places G (enable) on Pin 1 and outputs on Pins 3, 4, 10, and 11. Direct replacement requires PCB redesign.
What is the output drive strength of the CY74FCT157CTDR?
The CY74FCT157CTDR provides ±32 mA output drive: –32 mA source current (IOH) and +64 mA sink current (IOL) at VCC = 4.75 V. This allows direct interfacing with multiple TTL loads or driving moderate capacitive loads (up to ~30 pF) without external buffers, as confirmed in the "Electrical Characteristics" section of TI's SCCS014B datasheet.
Can the CY74FCT157CTDR be used in function generator applications?
Yes, the CY74FCT157CTDR can implement any of the 16 possible 2-variable Boolean functions (e.g., AND, OR, XOR, NAND) by configuring inputs I0x/I1x and select S - as documented in its functional description and truth table. Its matched rise/fall times and low propagation skew ensure accurate waveform synthesis in hardware-based logic generators.
CY74FCT157CTDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
CY74FCT157CTDR FAQ
1.How can I place an order for CY74FCT157CTDR through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT157CTDR 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 CY74FCT157CTDR reliable?
The price and inventory of CY74FCT157CTDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT157CTDR is usually 5 days.
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CY74FCT157CTDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT157CTDR 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 CY74FCT157CTDR?
For technical support, including CY74FCT157CTDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT157CTDR requirements.
6.How does Aetrix verify that CY74FCT157CTDR is sourced from the original manufacturer or authorized distributors?
All CY74FCT157CTDR 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 CY74FCT157CTDR meets industry standards.
7.What is the process for return or replacement of CY74FCT157CTDR?
All CY74FCT157CTDR units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT157CTDR, 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 CY74FCT157CTDR part is unused and in its original packaging.
Return procedure for CY74FCT157CTDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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