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Renesas IDT74FCT257CTSOG
- Part No.:
- IDT74FCT257CTSOG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
IDT74FCT257CTSOG.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,228
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Product details
Overview
IDT74FCT257CTSOG 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 embedded controllers and industrial logic boards.
For engineers reviewing the IDT74FCT257CTSOG datasheet, IDT74FCT257CTSOG pinout, IDT74FCT257CTSOG application, or IDT74FCT257CTSOG equivalent, key selection criteria include 3-state output enable timing (tPZH ≤ 7 ns), input hysteresis (200 mV), low leakage (≤1 µA), and SOIC-16 green package compatibility with JEDEC standard 18.
Technical Context
The IDT74FCT257CTSOG implements four independent 2:1 multiplexers sharing a common select (S) and active-low output enable (OE) control. Each channel selects between I0x and I1x inputs and drives a true (non-inverting) output Zx, with all outputs entering high-impedance state when OE is HIGH.
It uses advanced dual-metal CMOS technology to achieve TTL-level interface compatibility while maintaining CMOS power efficiency. The device supports live insertion via power-off disable outputs and meets JEDEC Std 18 for voltage thresholds, drive strength, and timing across the industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | 5.0 V ±5% - fixed single-rail operation; no dual-supply or level-shifting required |
| Propagation Delay (Ix→Zx) | 1.5–5 ns at CL = 50 pF - enables sub-100 MHz data routing in synchronous logic |
| Output Drive (IOL/IOH) | 48 mA / –15 mA - directly drives multiple TTL loads without external buffers |
| Input Leakage Current | ≤ ±1 µA max - ensures stable logic levels in high-impedance or battery-backed circuits |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, motor drives, and factory automation |
| Quiescent ICC | 0.01–1 mA - ultra-low static power for always-on logic sections |
| Input Hysteresis | 200 mV - improves noise immunity on slow-rising or noisy control lines (e.g., S, OE) |
Pinout & Package
Package: 16-pin Small Outline IC (SOIC), 300-mil body width, RoHS-compliant green finish (SOG suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (S) | Select Input | Common 2:1 selector for all four channels; LOW selects I0x, HIGH selects I1x |
| 2 (I0A) | Data Input A, Source 0 | First bit of first data source; routed to ZA when S = LOW |
| 3 (GND) | Ground Reference | Primary return path for all I/O and supply currents; must be low-impedance |
| 4 (ZB) | Output B | True-output of channel B; high-impedance when OE = HIGH |
| 5 (I0B) | Data Input B, Source 0 | Second bit of first data source; routed to ZB when S = LOW |
| 6 (I1B) | Data Input B, Source 1 | Second bit of second data source; routed to ZB when S = HIGH |
| 7 (I1A) | Data Input A, Source 1 | First bit of second data source; routed to ZA when S = HIGH |
| 8 (OE) | Output Enable (Active LOW) | Global 3-state control; LOW enables outputs, HIGH disables all Zx pins |
| 9 (I0C) | Data Input C, Source 0 | Third bit of first data source; routed to ZC when S = LOW |
| 10 (I1C) | Data Input C, Source 1 | Third bit of second data source; routed to ZC when S = HIGH |
| 11 (ZC) | Output C | True-output of channel C; high-impedance when OE = HIGH |
| 12 (I0D) | Data Input D, Source 0 | Fourth bit of first data source; routed to ZD when S = LOW |
| 13 (I1D) | Data Input D, Source 1 | Fourth bit of second data source; routed to ZD when S = HIGH |
| 14 (ZD) | Output D | True-output of channel D; high-impedance when OE = HIGH |
| 15 (VCC) | Positive Supply | +5 V power rail; bypassing with 0.1 µF ceramic capacitor near pin required |
| 16 (ZA) | Output A | True-output of channel A; high-impedance when OE = HIGH |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible I/O thresholds | VIH = 2.0 V min, VIL = 0.8 V max - interoperates directly with legacy 5 V TTL logic without level shifters |
| Live-insertion support | Power-off disable outputs (IOFF ≤ ±1 µA at VCC = 0 V) - allows hot-swap into powered backplanes |
| High noise immunity | 200 mV input hysteresis - rejects EMI on S and OE control lines in electrically noisy environments |
| Bus-interface optimized | Three-state outputs with tPZH/tPHZ ≤ 7 ns - enables clean bus sharing with minimal contention window |
| Low dynamic power | ICCD = 0.15–0.25 mA/MHz - reduces heat generation in dense logic arrays operating at 10+ MHz |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Arbitration |
|---|---|
Use Scenario: Routing sensor data from multiple analog input modules onto a shared 8-bit parallel bus in a programmable logic controller chassis. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer selecting between primary and backup sensor streams per channel under firmware control. Use Value: Enables redundant signal paths without adding glue logic; 48 mA drive ensures signal integrity across 15 cm PCB traces. |
Use Scenario: Resolving contention between two microcontrollers sharing a common ISA-style memory-mapped peripheral bus. IC Role / Device Role / Timing Role: Data-path switch enabling one controller to read/write peripherals while the other is idle. Use Value: tPLH ≤ 5 ns and 3-state disable timing allow sub-20 ns bus handoff, preventing data corruption during arbitration. |
| Motor Drive Control Logic | Test Equipment Signal Routing |
Use Scenario: Selecting between position feedback sources (encoder vs. resolver) for closed-loop servo control in variable-frequency drives. IC Role / Device Role / Timing Role: Real-time analog-to-digital interface multiplexer synchronizing with PWM interrupt timing. Use Value: Industrial temp rating (–40°C to +85°C) and 200 mV hysteresis ensure reliable operation near heat-generating IGBT modules. |
Use Scenario: Configuring stimulus/response paths in automated test equipment that routes signals between DUT, digitizer, and function generator. IC Role / Device Role / Timing Role: Reconfigurable signal path element controlled by FPGA-based sequencer. Use Value: SOIC-16 footprint allows dense placement on test head PCBs; low ICC (≤1 mA) minimizes thermal drift in precision measurement zones. |
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 logic function, but F-series TTL (not FCT); higher ICC (15 mA typ), slower tPLH (10 ns max) | Limited to lower-speed designs; not suitable for >25 MHz bus switching | Choose only if legacy TTL board reuse requires identical pinout and no timing margin constraints |
| 74AC257SCX | Advanced CMOS; wider VCC range (2–6 V), but lower drive (–24 mA/24 mA) and no guaranteed 5 V TTL compatibility | Requires external level translation for mixed 5 V TTL systems | Prefer for new low-voltage (3.3 V) designs where power efficiency outweighs legacy interface needs |
Compared with SN74F257N and 74AC257SCX, the IDT74FCT257CTSOG uniquely balances 5 V TTL interoperability, 48 mA drive, and sub-5 ns propagation delay-making it optimal for industrial bus interfaces requiring both robustness and speed without redesign.
Availability
IDT74FCT257CTSOG is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, motor drive control logic, and legacy bus arbitration requiring stable component supply and long-term lifecycle support.
Supply support for IDT74FCT257CTSOG 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 microcontrollers, analog, power, and timing solutions for automotive, industrial, and infrastructure markets.
IDT74FCT257CTSOG belongs to the legacy IDT Fast CMOS logic family, engineered specifically for high-speed, low-power 5 V digital systems requiring TTL compatibility and industrial reliability-particularly in factory automation and control equipment.
FAQ
What is the operating voltage range for IDT74FCT257CTSOG?
IDT74FCT257CTSOG operates at a nominal VCC of 5.0 V ±5%, meaning its valid supply range is 4.75 V to 5.25 V. This fixed single-rail requirement ensures compatibility with standard 5 V TTL and CMOS systems. Operation outside this range may cause functional failure or accelerated wear. The device does not support dual-supply or wide-VCC operation.
Does IDT74FCT257CTSOG support live insertion into powered systems?
Yes, IDT74FCT257CTSOG supports live insertion due to its power-off disable feature: when VCC = 0 V, input/output leakage is limited to ±1 µA maximum (IOFF), preventing back-driving or latch-up on powered backplanes. This behavior is explicitly verified in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the official datasheet.
What is the maximum clock/data toggle frequency supported by IDT74FCT257CTSOG?
IDT74FCT257CTSOG is not a clocked device and has no internal clock; its maximum usable data rate depends on propagation delay and load. With CL = 50 pF and RL = 500 Ω, tPLH/tPHL ≤ 5 ns enables reliable operation up to ~100 MHz for short traces. Dynamic current data (ICCD = 0.15–0.25 mA/MHz) confirms stable performance at 10 MHz output toggling across all four channels.
Is IDT74FCT257CTSOG pin-compatible with SN74LS257?
No, IDT74FCT257CTSOG is not pin-compatible with SN74LS257. While both are quad 2-input multiplexers in 16-pin packages, their pinouts differ: SN74LS257 places VCC at pin 16 and GND at pin 8, whereas IDT74FCT257CTSOG places VCC at pin 15 and GND at pin 3. Direct replacement would require PCB layout revision.
What does the "SOG" suffix indicate in IDT74FCT257CTSOG?
The "SOG" suffix in IDT74FCT257CTSOG denotes Small Outline IC (SOIC) package with green (lead-free, RoHS-compliant) finish and 300-mil body width. It corresponds to the industry-standard SOIC-16N footprint (JEDEC MS-012), distinct from QSOP ("QG") or ceramic packages. This package is compatible with standard reflow soldering profiles for lead-free assembly.
IDT74FCT257CTSOG 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
IDT74FCT257CTSOG FAQ
1.How can I place an order for IDT74FCT257CTSOG through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT74FCT257CTSOG 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 IDT74FCT257CTSOG reliable?
The price and inventory of IDT74FCT257CTSOG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT74FCT257CTSOG is usually 5 days.
3.What payment methods are accepted for IDT74FCT257CTSOG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT74FCT257CTSOG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT74FCT257CTSOG?
IDT74FCT257CTSOG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT74FCT257CTSOG 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 IDT74FCT257CTSOG?
For technical support, including IDT74FCT257CTSOG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT74FCT257CTSOG requirements.
6.How does Aetrix verify that IDT74FCT257CTSOG is sourced from the original manufacturer or authorized distributors?
All IDT74FCT257CTSOG 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 IDT74FCT257CTSOG meets industry standards.
7.What is the process for return or replacement of IDT74FCT257CTSOG?
All IDT74FCT257CTSOG units undergo pre-shipment inspection (PSI). If there is an issue with IDT74FCT257CTSOG, 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 IDT74FCT257CTSOG part is unused and in its original packaging.
Return procedure for IDT74FCT257CTSOG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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