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Renesas IDT74FCT257ATSOG
- Part No.:
- IDT74FCT257ATSOG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
IDT74FCT257ATSOG.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,103
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Product details
Overview
IDT74FCT257ATSOG from Renesas Electronics (formerly IDT) is a fast CMOS quad 2-input multiplexer with 3-state outputs, designed for bus-oriented digital systems. It features true TTL-compatible inputs/outputs (VOH = 3.3 V typ., VOL = 0.3 V typ.), high-drive capability (–15 mA IOH, 48 mA IOL), and industrial temperature operation (–40°C to +85°C). Used in data routing, address selection, and bus arbitration in legacy industrial controllers.
For engineers reviewing the IDT74FCT257ATSOG datasheet, IDT74FCT257ATSOG pinout, IDT74FCT257ATSOG application, or IDT74FCT257ATSOG equivalent, key selection criteria include 3-state output enable timing (tPZH/tPHZ ≤ 7 ns), input leakage ≤1 µA, SOIC-16 package compatibility, and JEDEC Std-18 compliance for legacy system upgrades.
Technical Context
The IDT74FCT257ATSOG implements four independent 2:1 multiplexers sharing one common select (S) and active-low output enable (OE) control. Each channel routes either I0x or I1x to Zx based on S, with non-inverting logic and high-impedance outputs when OE is asserted.
It uses advanced dual-metal CMOS technology to achieve TTL-level interface compatibility while maintaining CMOS power efficiency (ICC ≤ 1 mA typical at 5 V). The device supports live insertion via power-off disable outputs and meets JEDEC Standard 18 for interoperability with legacy TTL and FCT families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0 V ±5% - fixed single-rail operation compatible with legacy 5 V TTL systems |
| Propagation Delay | tPLH/tPHL ≤ 5 ns (CL = 50 pF, RL = 500 Ω) - enables sub-100 MHz data routing in synchronous buses |
| Output Drive | IOL = 48 mA, IOH = –15 mA - drives heavy capacitive loads and multiple TTL inputs without buffers |
| Input Leakage | ≤ ±1 µA max - ensures stable logic levels in low-power standby or high-impedance bus states |
| Operating Temp | –40°C to +85°C - qualified for industrial control, motor drives, and factory automation environments |
| Quiescent Current | ICC ≤ 1 mA - minimizes static power in always-on monitoring subsystems |
| Enable Timing | tPZH ≤ 7 ns, tPHZ ≤ 5.5 ns - supports fast bus turnaround in time-critical arbitration cycles |
Pinout & Package
Package: 16-pin Small Outline IC (SOIC-16, 300-mil body, green RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (S) | Select Input | Common 2:1 selector for all four channels; determines whether I0x or I1x appears at Zx |
| 2 (I0A) | Data Input A, Source 0 | First bit of first data source; routed to ZA when S = L |
| 3 (I0B) | Data Input B, Source 0 | Second bit of first data source; routed to ZB when S = L |
| 4 (GND) | Ground Reference | Primary signal and power return path; decoupling capacitor must be placed adjacent |
| 5 (ZB) | Output B | Buffered, 3-state output for channel B; high-impedance when OE = H |
| 6 (I0C) | Data Input C, Source 0 | Third bit of first data source; routed to ZC when S = L |
| 7 (I1C) | Data Input C, Source 1 | Third bit of second data source; routed to ZC when S = H |
| 8 (OE) | Output Enable (Active LOW) | Global 3-state control; all outputs enter high-Z when OE = H |
| 9 (I0D) | Data Input D, Source 0 | Fourth bit of first data source; routed to ZD when S = L |
| 10 (I1D) | Data Input D, Source 1 | Fourth bit of second data source; routed to ZD when S = H |
| 11 (ZD) | Output D | Buffered, 3-state output for channel D; synchronized with OE and S |
| 12 (VCC) | Positive Supply | +5 V power rail; requires local 0.1 µF ceramic decoupling to GND |
| 13 (ZA) | Output A | Buffered, non-inverting output for channel A; reflects selected input with no inversion |
| 14 (I1A) | Data Input A, Source 1 | First bit of second data source; routed to ZA when S = H |
| 15 (I1B) | Data Input B, Source 1 | Second bit of second data source; routed to ZB when S = H |
| 16 (ZC) | Output C | Buffered, 3-state output for channel C; shares timing characteristics with ZA–ZD |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible I/O levels | VOH ≥ 2.4 V / VOL ≤ 0.5 V at full drive - eliminates level-shifting in mixed 5 V logic systems |
| Live-insertion support | Power-off disable outputs (IOFF ≤ ±1 µA at VCC = 0 V) - enables hot-swap capability in backplane designs |
| High noise immunity | VH = 200 mV hysteresis - suppresses false switching from EMI or slow-rising signals on S and OE |
| JEDEC Std-18 compliance | Fully conforms to JESD8-A - guarantees interoperability with industry-standard FCT and TTL components |
| Low dynamic power | ICCD ≤ 0.25 mA/MHz - reduces switching current in burst-mode data transfer applications |
Applications
| Industrial PLC Backplane Data Routing | Legacy Microprocessor Address Bus Multiplexing |
|---|---|
Use Scenario: Selecting between two parallel I/O expansion modules on a programmable logic controller backplane. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer enabling real-time switching of 4-bit status or command data under microcontroller control. Use Value: Single-cycle bus arbitration with tPHL ≤ 5 ns ensures deterministic response during safety-critical I/O updates. |
Use Scenario: Sharing a 16-bit address bus between CPU and DMA controller in an 80C188-based embedded system. IC Role / Device Role / Timing Role: Address line selector that isolates CPU and DMA address paths using shared S and OE controls. Use Value: 48 mA IOL drives full address bus capacitance without external buffers, reducing component count. |
| Automated Test Equipment Signal Path Switching | Industrial Sensor Data Aggregation Hub |
Use Scenario: Routing analog-to-digital converter outputs from four sensor banks to a single ADC interface. IC Role / Device Role / Timing Role: Digital multiplexer front-end synchronizing sensor readout timing across four channels. Use Value: Matched propagation delays (tPLH/tPHL ≤ 5 ns) minimize inter-channel skew in time-aligned sampling. |
Use Scenario: Consolidating digital status bits from four discrete temperature sensors into a shared RS-485 diagnostic bus. IC Role / Device Role / Timing Role: Status bit aggregator enabling polled diagnostics without dedicated MCU GPIO per sensor. Use Value: ≤1 µA input leakage prevents false state changes during long-duration idle polling intervals. |
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 |
|---|---|---|---|
| SN74F257N | Same function, but TTL process; higher ICC (20 mA typical), slower tPLH (10 ns max), no live-insertion support | Limited to non-hot-swap 5 V systems; not suitable for bus-sharing with powered-down peripherals | Choose only if legacy board reuse requires identical pinout and TTL drive strength |
| 74AC257SCX | CMOS process; lower drive (–24 mA/24 mA), wider VCC range (2–6 V), no JEDEC Std-18 compliance | Better for mixed-voltage systems but lacks guaranteed TTL compatibility and industrial temp rating | Prefer for new designs requiring 3.3 V compatibility or lower static power, not for drop-in replacement |
Compared with SN74F257N and 74AC257SCX, the IDT74FCT257ATSOG uniquely combines industrial temperature operation, JEDEC Std-18 compliance, live-insertion capability, and 48 mA sink drive-making it the only option qualified for high-reliability, bus-shared legacy industrial upgrades.
Availability
IDT74FCT257ATSOG is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microprocessor address management, and automated test equipment signal routing requiring stable component supply and long-term obsolescence mitigation.
Supply support for IDT74FCT257ATSOG 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
Renesas Electronics Corporation is a global semiconductor leader formed through the merger of NEC Electronics, Renesas Technology, and IDT. It delivers high-performance, reliable solutions for automotive, industrial, and infrastructure markets.
IDT74FCT257ATSOG belongs to the legacy FCT (Fast CMOS TTL-compatible) logic family, engineered specifically for seamless integration into 5 V industrial control systems requiring robust noise immunity, bus-sharing capability, and long-lifecycle support.
FAQ
Is IDT74FCT257ATSOG still in production or considered obsolete?
IDT74FCT257ATSOG is marked obsolete by Renesas as of September 2019 and is not recommended for new designs. However, Aetrix Electronics maintains verified legacy stock with full traceability and provides extended availability support-including last-time-buy planning and cross-reference guidance-for ongoing industrial maintenance and repair programs relying on this part.
What is the maximum clock/data toggle frequency supported by IDT74FCT257ATSOG?
IDT74FCT257ATSOG does not operate on a clock; it is asynchronous. Its usable data rate depends on propagation delay and load. With CL = 50 pF and RL = 500 Ω, tPLH/tPHL ≤ 5 ns allows reliable operation up to ~100 MHz for clean edge transitions, assuming proper PCB layout and termination.
Does IDT74FCT257ATSOG require external pull-up or pull-down resistors on its control pins?
No. IDT74FCT257ATSOG has TTL-compatible inputs with defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds and internal input hysteresis (200 mV). OE and S can be driven directly from standard 5 V logic without external biasing, provided source impedance remains below 500 Ω.
Can IDT74FCT257ATSOG interface directly with 3.3 V logic devices?
IDT74FCT257ATSOG is a 5 V-only device (VCC = 5.0 V ±5%). Its inputs accept 3.3 V as valid HIGH (VIH min = 2.0 V), but its outputs swing to 3.3 V typical VOH - insufficient for driving 3.3 V TTL inputs reliably. Level translation is required for bidirectional 3.3 V interfacing.
What is the meaning of "SOG" in IDT74FCT257ATSOG?
"SOG" denotes the package variant: Small Outline IC (SOIC), 300-mil body width, green (RoHS-compliant) finish. It corresponds to the industry-standard 16-pin SOIC package (JEDEC MS-012), distinct from the QSOP (QG) variant also offered for IDT74FCT257AT/CT/DT.
IDT74FCT257ATSOG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 15mA, 48mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
IDT74FCT257ATSOG FAQ
1.How can I place an order for IDT74FCT257ATSOG through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT74FCT257ATSOG 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 IDT74FCT257ATSOG reliable?
The price and inventory of IDT74FCT257ATSOG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT74FCT257ATSOG is usually 5 days.
3.What payment methods are accepted for IDT74FCT257ATSOG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT74FCT257ATSOG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT74FCT257ATSOG?
IDT74FCT257ATSOG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT74FCT257ATSOG 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 IDT74FCT257ATSOG?
For technical support, including IDT74FCT257ATSOG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT74FCT257ATSOG requirements.
6.How does Aetrix verify that IDT74FCT257ATSOG is sourced from the original manufacturer or authorized distributors?
All IDT74FCT257ATSOG 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 IDT74FCT257ATSOG meets industry standards.
7.What is the process for return or replacement of IDT74FCT257ATSOG?
All IDT74FCT257ATSOG units undergo pre-shipment inspection (PSI). If there is an issue with IDT74FCT257ATSOG, 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 IDT74FCT257ATSOG part is unused and in its original packaging.
Return procedure for IDT74FCT257ATSOG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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