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Texas Instruments CY74FCT157ATSOC
- Part No.:
- CY74FCT157ATSOC
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT157ATSOC.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:604
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Product details
Overview
CY74FCT157ATSOC 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 16-pin SOIC (DW) packaging, 5 ns maximum propagation delay (tPLH/tPHL), ±32 mA output drive capability, and Ioff support for partial-power-down operation. It is commonly used in register-to-bus data selection and irregular logic synthesis.
For engineers reviewing the CY74FCT157ATSOC datasheet, CY74FCT157ATSOC pinout, CY74FCT157ATSOC application, or CY74FCT157ATSOC equivalent, key selection criteria include its 5 ns speed grade, 3.3 V typical VOH, 0.55 V max VOL at 64 mA sink, Ioff-enabled power-down isolation, and compatibility with both TTL and FCT logic families.
Technical Context
The CY74FCT157ATSOC implements four independent 2:1 multiplexers sharing a common select (S) and active-low enable (E) control. 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 architecture includes edge-rate control circuitry to reduce switching noise, matched rise/fall times for clean signal transitions, and input thresholds compatible with TTL (VIH = 2 V min, VIL = 0.8 V max) and CMOS logic levels. Ioff protection disables outputs and blocks current flow when VCC = 0 V, enabling safe hot-insertion and partial-power-down modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | Max 5 ns (tPLH/tPHL, I→Y), enabling 200 MHz worst-case toggle rate in critical paths |
| Output Drive | ±32 mA (IOH/IOL), sufficient to directly drive multiple TTL loads or terminate short PCB traces |
| Supply Voltage | 4.75–5.25 V, tightly regulated range ensuring stable timing and noise immunity in industrial 5 V rails |
| Ioff Current | ±1 µA at VCC = 0 V, preventing backflow damage during system power sequencing |
| Input Thresholds | VIH ≥ 2 V, VIL ≤ 0.8 V - fully interoperable with legacy TTL and modern FCT logic without level-shifting |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for robust board handling |
| Operating Temperature | –40°C to +85°C, qualified for commercial/industrial ambient environments without derating |
Pinout & Package
Package: 16-pin SOIC (DW), 7.5 mm × 10.3 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Active-low output enable | Drives all Y outputs to high-impedance when high; enables multiplexing only when low |
| 2 (S) | Common data select | Controls source selection across all four channels: S = L → I0x, S = H → I1x |
| 3 (I0a) | Data input A, source 0 | First bit of lower-source group; routed to Ya when S = L and E = L |
| 4 (I1a) | Data input A, source 1 | First bit of upper-source group; routed to Ya when S = H and E = L |
| 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 lower-source group; routed to Yb under same S/E conditions as I0a |
| 7 (I1b) | Data input B, source 1 | Second bit of upper-source group; routed to Yb under same S/E conditions as I1a |
| 8 (Yb) | Noninverted output B | 3-state output for channel B; electrically identical to Ya in timing and drive |
| 9 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-impedance |
| 10 (VCC) | Power supply | 5 V nominal supply; decoupling capacitor required within 1 cm for noise suppression |
| 11 (I0c) | Data input C, source 0 | Third bit of lower-source group; routed to Yc when S = L and E = L |
| 12 (I1c) | Data input C, source 1 | Third bit of upper-source group; routed to Yc when S = H and E = L |
| 13 (Yc) | Noninverted output C | 3-state output for channel C; matches Ya/Yb in electrical specs and timing |
| 14 (I0d) | Data input D, source 0 | Fourth bit of lower-source group; routed to Yd when S = L and E = L |
| 15 (I1d) | Data input D, source 1 | Fourth bit of upper-source group; routed to Yd when S = H and E = L |
| 16 (Yd) | Noninverted output D | 3-state output for channel D; completes quad-mux functionality with identical specs |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dV/dt, improving signal integrity on dense PCBs |
| Ioff partial-power-down support | Enables safe interconnection between powered and unpowered subsystems without latch-up or backfeed risk |
| Matched rise/fall times | Ensures symmetrical waveform edges (tPLH ≈ tPHL), minimizing duty-cycle distortion in clock/data paths |
| TTL- and FCT-compatible interface | Accepts standard TTL input levels and drives FCT loads directly-no external level shifters required |
| 3-state bus-hold capability | Outputs enter high-impedance mode cleanly on E assertion, eliminating contention on shared data buses |
Applications
| Register File Data Routing | Bus Arbitration Logic |
|---|---|
|
Use Scenario: Selecting between two 4-bit register banks (e.g., accumulator vs. temporary storage) for write-back to a common ALU input bus. IC Role / Device Role / Timing Role: Quad 2:1 mux acting as a synchronous data selector; S controls bank choice, E gates bus access. Use Value: Enables dual-register architecture without additional glue logic; 5 ns delay ensures no cycle penalty in 20 MHz CPU designs. |
Use Scenario: Resolving contention among three peripheral controllers sharing a single 4-bit status/data bus. IC Role / Device Role / Timing Role: Configured as a priority encoder front-end; E tied to arbitration grant signal, S selects active controller. Use Value: Eliminates need for discrete AND/OR gates; 3-state outputs prevent bus conflicts during grant transitions. |
| Function Generator | Legacy System Interface Adapter |
|
Use Scenario: Implementing custom combinational logic (e.g., parity check, nibble swap, or arithmetic flag decoding) using minimal gate count. IC Role / Device Role / Timing Role: Used as a 4-output truth table generator; I0x/I1x represent minterm inputs, S selects function variant. Use Value: Replaces up to 16 NAND/NOR gates; supports any 4 of 16 2-variable Boolean functions with one device. |
Use Scenario: Bridging 5 V TTL peripherals (e.g., UART, parallel port) to newer 5 V FCT-based microcontroller buses. IC Role / Device Role / Timing Role: Level-translation and signal conditioning layer; absorbs VIH/VIL mismatches and provides drive strength boost. Use Value: Maintains full 5 V logic compatibility while adding noise immunity and hot-swap safety via Ioff. |
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 | 4.3 ns max propagation delay (vs. 5 ns); 12 mA/32 mA drive (vs. 32 mA/64 mA) | Higher-speed, lower-drive variant; suitable where timing margin is tight but load current ≤32 mA | Select CY74FCT157CTSOC when system clock >230 MHz or fanout is light; CY74FCT157ATSOC preferred for heavy TTL loads. |
| SN74F157N | 74F-family; 4.5 ns max delay; 20 mA/0.4 mA drive; no Ioff or edge-rate control | Lacks partial-power-down and noise-reduction features; not suitable for mixed-power-domain systems | Choose SN74F157N only in legacy 74F-only designs; avoid where Ioff or EMI control is required. |
Compared with CY74FCT157CTSOC and SN74F157N, the CY74FCT157ATSOC delivers optimal balance of speed (5 ns), drive strength (64 mA sink), and system-level robustness (Ioff, edge-rate control), making it the preferred choice for new industrial and embedded designs requiring reliability and interoperability.
Availability
CY74FCT157ATSOC is available at Aetrix Electronics and suitable for industrial control interfaces, legacy system upgrades, and embedded data-path routing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for CY74FCT157ATSOC 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 CY74FCT157ATSOC belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible digital interfacing in mission-critical industrial and computing systems.
FAQ
What is the maximum operating temperature range for the CY74FCT157ATSOC?
The CY74FCT157ATSOC is rated for operation from –40°C to +85°C, meeting industrial-grade thermal requirements. This range is validated per TI's production test flow and applies to the SOIC (DW) package configuration shipped in tube format. Derating is not required within this span, and thermal impedance (θJA = 57°C/W) supports sustained operation under typical PCB copper pour conditions.
Does the CY74FCT157ATSOC support partial-power-down operation?
Yes, the CY74FCT157ATSOC includes Ioff circuitry that actively disables outputs and limits reverse current to ±1 µA when VCC = 0 V. This feature allows safe insertion into live backplanes or interconnection with unpowered subsystems - a key requirement in modular industrial controllers where boards may be hot-swapped or powered independently.
What is the output drive capability of the CY74FCT157ATSOC?
The CY74FCT157ATSOC provides ±32 mA output drive (IOH = –32 mA, IOL = 64 mA), verified at VCC = 4.75–5.25 V and TA = –40°C to +85°C. This enables direct driving of up to 10 standard TTL loads or termination of stubbed transmission lines up to 15 cm on FR-4, without external buffers - critical for compact industrial I/O modules.
How does the CY74FCT157ATSOC differ from the CY74FCT157CTSOC?
The CY74FCT157ATSOC has a 5 ns maximum propagation delay and higher drive (64 mA sink), while the CY74FCT157CTSOC offers 4.3 ns delay but lower sink current (32 mA). Both share identical pinout, package (SOIC-DW), and Ioff functionality. The "A" suffix denotes the faster drive grade; the "C" suffix indicates the faster timing grade - selection depends on whether system timing or load drive is the limiting factor.
Is the CY74FCT157ATSOC pin-compatible with older 74LS or 74F series multiplexers?
The CY74FCT157ATSOC is functionally and pin-compatible with 74LS157 and 74F157 in SOIC-16 (DW/D) packages, including identical pin assignments for E, S, I0x, I1x, and Yx. However, it adds Ioff, edge-rate control, and tighter VOH/VOL specs - meaning it can drop into legacy designs without layout change, while delivering improved noise immunity and power-down safety.
CY74FCT157ATSOC 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
CY74FCT157ATSOC FAQ
1.How can I place an order for CY74FCT157ATSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT157ATSOC 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 CY74FCT157ATSOC reliable?
The price and inventory of CY74FCT157ATSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT157ATSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT157ATSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT157ATSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT157ATSOC?
CY74FCT157ATSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT157ATSOC 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 CY74FCT157ATSOC?
For technical support, including CY74FCT157ATSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT157ATSOC requirements.
6.How does Aetrix verify that CY74FCT157ATSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT157ATSOC 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 CY74FCT157ATSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT157ATSOC?
All CY74FCT157ATSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT157ATSOC, 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 CY74FCT157ATSOC part is unused and in its original packaging.
Return procedure for CY74FCT157ATSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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