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Texas Instruments CY74FCT157ATDR
- Part No.:
- CY74FCT157ATDR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT157ATDR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,327
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Product details
Overview
CY74FCT157ATDR from Texas Instruments is a quad 2-input multiplexer with 3-state outputs, designed for data routing and function generation in TTL-compatible digital systems. It features 64-mA sink / 32-mA source drive strength, 5 ns propagation delay (max), and Ioff support for partial-power-down operation. Used in bus-oriented logic, register-to-bus selection, and irregular combinational logic implementation.
For engineers reviewing the CY74FCT157ATDR datasheet, CY74FCT157ATDR pinout, CY74FCT157ATDR application, or CY74FCT157ATDR equivalent, key selection criteria include 3-state output control timing, ±1 µA Ioff leakage at VCC = 0 V, 5.25 V max supply voltage, and SOIC-16 package compatibility with industrial temperature range (–40°C to 85°C).
Technical Context
The CY74FCT157ATDR implements four independent 2:1 multiplexers sharing one common select (S) and active-low enable (E) input. Each Y output reflects either I0x or I1x based on S state when E is low; all outputs go high-impedance when E is high. Its FCT-family architecture ensures TTL-level input thresholds (VIL = 0.8 V, VIH = 2 V) and CMOS-compatible output swing (VOH = 2.4 V min at IOH = –32 mA).
Edge-rate control circuitry limits di/dt to reduce switching noise, while matched rise/fall times (tPLH/tPHL ≤ 5 ns) ensure clean signal transitions. The device supports hot-insertion via Ioff, blocking current flow between powered and unpowered system sections when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - Ensures stable operation within standard 5-V TTL/CMOS rail tolerances. |
| Propagation Delay | 1.5 ns (min) to 5 ns (max) - Enables reliable timing in high-speed bus multiplexing up to ~100 MHz system clock domains. |
| Output Drive | 64 mA sink / 32 mA source - Drives heavy capacitive loads or multiple TTL inputs without external buffers. |
| Ioff Leakage | ±1 µA at VCC = 0 V - Prevents backflow current during partial power-down, protecting upstream/downstream circuitry. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - Fully interoperable with legacy TTL logic families without level-shifting. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade robustness requirements for board-level handling and operation. |
| Operating Temperature | –40°C to +85°C - Qualified for commercial and industrial embedded applications with thermal cycling resilience. |
Pinout & Package
Package: SOIC-16 (D package), body size 10.3 mm × 6.5 mm, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C, unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Active-low output enable | Drives all Y outputs into high-impedance state when logic high; enables multiplexing only when low. |
| 2 (I0a) | Data input A, source 0 | First bit of first data group routed to Ya when S = low. |
| 3 (I1a) | Data input A, source 1 | Alternate first-bit source selected when S = high. |
| 4 (Ya) | Noninverted output A | 3-state output reflecting selected I0a/I1a; compatible with bus loading up to 64 mA sink. |
| 5 (I0b) | Data input B, source 0 | Second bit of first data group, routed to Yb when S = low. |
| 6 (I1b) | Data input B, source 1 | Alternate second-bit source selected when S = high. |
| 7 (Yb) | Noninverted output B | 3-state output synchronized with Ya timing; matches tPLH/tPHL ≤ 5 ns. |
| 8 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-impedance for noise control. |
| 9 (VCC) | Positive supply | 5-V nominal supply; decoupling capacitor required near pin to suppress switching transients. |
| 10 (S) | Common data select | Single control line determining source (I0x vs I1x) for all four channels simultaneously. |
| 11 (I0c) | Data input C, source 0 | Third bit of first data group, routed to Yc when S = low. |
| 12 (I1c) | Data input C, source 1 | Alternate third-bit source selected when S = high. |
| 13 (Yc) | Noninverted output C | 3-state output with identical drive and timing specs as Ya/Yb/Yd. |
| 14 (I0d) | Data input D, source 0 | Fourth bit of first data group, routed to Yd when S = low. |
| 15 (I1d) | Data input D, source 1 | Alternate fourth-bit source selected when S = high. |
| 16 (Yd) | Noninverted output D | Final 3-state output; completes quad-channel data routing capability. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Control | Active-low enable (E) forces all Ya–Yd into high-Z mode, enabling shared-bus arbitration without contention. |
| Ioff Partial-Power-Down Support | Blocks current flow when VCC = 0 V, allowing safe insertion/removal in live backplane or hot-swap systems. |
| Edge-Rate Controlled Outputs | Controlled slew rate reduces simultaneous switching noise (SSN), easing EMI compliance in dense PCB layouts. |
| Matched Rise/Fall Times | tPLH ≈ tPHL (≤5 ns) minimizes duty-cycle distortion in clock/data paths and improves signal integrity. |
| TTL-Compatible Input Levels | VIL = 0.8 V / VIH = 2.0 V ensures direct interface with legacy 74LS/74ALS logic without level translation. |
Applications
| Bus Arbitration Logic | Register File Multiplexing |
|---|---|
Use Scenario: Selecting between two 4-bit data buses (e.g., ALU result vs memory read) onto a common CPU data bus. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing cycle-accurate, glitch-free bus switching under S and E control. Use Value: Eliminates need for discrete gates or larger CPLDs; 5 ns propagation delay supports >100 MHz bus cycles. | Use Scenario: Routing data from two independent 4-bit register banks (e.g., accumulator vs index register) to arithmetic unit inputs. IC Role / Device Role / Timing Role: Data selector synchronizing register reads with instruction decode timing using shared S/E signals. Use Value: Reduces gate count and layout area versus discrete mux implementations; Ioff prevents register corruption during power sequencing. |
| Function Generator | Industrial I/O Expansion |
Use Scenario: Implementing arbitrary 4-output Boolean functions of two variables (e.g., control logic for stepper motor sequencing). IC Role / Device Role / Timing Role: Programmable logic block generating any of 16 possible 2-input truth tables by wiring I0x/I1x to fixed logic levels. Use Value: Replaces dedicated PAL/GAL devices in low-complexity control applications; no programming overhead or configuration memory. | Use Scenario: Consolidating sensor data streams (e.g., 4 analog channel digitizers) onto a single microcontroller SPI or parallel interface. IC Role / Device Role / Timing Role: Signal router enabling time-division multiplexing of multiple sensor outputs under MCU GPIO control. Use Value: Low-cost alternative to integrated ADCs with serial interfaces; 64-mA drive supports long traces to remote sensors. |
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 |
|---|---|---|---|
| SN74FCT157D | Same SOIC-16 package, identical pinout, but rated for 4.5–5.5 V supply and 32-mA sink (CY54FCT157T spec); slower 5.8 ns max tPLH. | Lower drive strength limits use in high-fanout or long-trace applications; suitable for legacy 5-V systems with relaxed timing. | Select when cost sensitivity outweighs speed or drive needs; verify VCC tolerance and load requirements match. |
| 74AC157M | SOIC-16, 2-V to 6-V supply, 24-mA drive, 6 ns max propagation delay; no Ioff or edge-rate control. | Lacks partial-power-down protection and noise-reduction features; requires external isolation in mixed-power systems. | Choose for wider supply flexibility or AC-series compatibility; avoid in hot-swap or noise-critical environments. |
Compared with SN74FCT157D and 74AC157M, the CY74FCT157ATDR delivers superior noise immunity via edge-rate control, higher 64-mA sink capability for driving terminated lines, and guaranteed Ioff behavior essential for robust power sequencing in industrial controllers.
Availability
CY74FCT157ATDR is available at Aetrix Electronics and suitable for bus arbitration, register file selection, function generation, and industrial I/O expansion requiring stable component supply across extended temperature ranges.
Supply support for CY74FCT157ATDR 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 CY74FCT157ATDR belongs to TI's FCT logic family, engineered for noise-immune, high-drive 5-V TTL-compatible operation in industrial control, test equipment, and communications infrastructure.
FAQ
What is the maximum operating supply voltage for CY74FCT157ATDR?
The CY74FCT157ATDR is specified for a maximum supply voltage of 5.25 V under recommended operating conditions. Absolute maximum rating is 7 V, but sustained operation above 5.25 V risks parametric violation and reduced reliability. Always maintain VCC within 4.75 V to 5.25 V for guaranteed timing, drive, and logic-level compliance per the CY74FCT157ATDR datasheet.
Does CY74FCT157ATDR support hot-swap or partial-power-down operation?
Yes, CY74FCT157ATDR includes Ioff circuitry that disables outputs and limits leakage to ±1 µA when VCC = 0 V. This allows safe insertion into live backplanes or operation in systems where other rails remain active, preventing damaging current backflow - a critical feature confirmed in the CY74FCT157ATDR absolute maximum ratings and functional description.
What is the pinout compatibility of CY74FCT157ATDR with other FCT-family multiplexers?
CY74FCT157ATDR uses the industry-standard SOIC-16 pinout for quad 2:1 multiplexers (pin 1 = E, pins 2–3 = I0a/I1a, pin 4 = Ya, etc.), matching SN74FCT157D and CY74FCT157ATSOC. Pin-for-pin compatibility is confirmed in TI's SCCS014B datasheet and ordering information tables for CY74FCT157ATDR and related variants.
How does the edge-rate control in CY74FCT157ATDR improve system noise performance?
CY74FCT157ATDR integrates edge-rate control circuitry that limits output slew rate, reducing di/dt-induced crosstalk and ground bounce. This significantly lowers simultaneous switching noise (SSN) in dense PCB layouts - a documented feature in the CY74FCT157ATDR datasheet's "Key Features" section and validated by improved EMI behavior in industrial timing applications.
Can CY74FCT157ATDR be used as a function generator, and how?
Yes, CY74FCT157ATDR can implement any of 16 possible 2-input Boolean functions by hardwiring I0x and I1x inputs to fixed logic levels (VCC/GND) and using S as the variable input. For example, setting I0a = GND and I1a = VCC configures Ya as a noninverting buffer for S. This function-generation capability is explicitly described in the CY74FCT157ATDR datasheet's "Description" section and application examples.
CY74FCT157ATDR 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:
- 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
CY74FCT157ATDR FAQ
1.How can I place an order for CY74FCT157ATDR through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT157ATDR 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 CY74FCT157ATDR reliable?
The price and inventory of CY74FCT157ATDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT157ATDR is usually 5 days.
3.What payment methods are accepted for CY74FCT157ATDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT157ATDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT157ATDR?
CY74FCT157ATDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT157ATDR 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 CY74FCT157ATDR?
For technical support, including CY74FCT157ATDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT157ATDR requirements.
6.How does Aetrix verify that CY74FCT157ATDR is sourced from the original manufacturer or authorized distributors?
All CY74FCT157ATDR 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 CY74FCT157ATDR meets industry standards.
7.What is the process for return or replacement of CY74FCT157ATDR?
All CY74FCT157ATDR units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT157ATDR, 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 CY74FCT157ATDR part is unused and in its original packaging.
Return procedure for CY74FCT157ATDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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