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Renesas 74FCT245CTPYG
- Part No.:
- 74FCT245CTPYG
- Manufacturer:
- Renesas
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74FCT245CTPYG.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,908
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Product details
Overview
74FCT245CTPYG from Renesas Electronics (formerly IDT) is a fast CMOS octal bidirectional transceiver in 20-pin TSSOP package, supporting industrial temperature range (–40°C to +85°C), 5V supply, ±15mA high-drive outputs, and true TTL-compatible I/O with VOH = 3.3V (typ.) and VOL = 0.3V (typ.). It enables asynchronous two-way data bus communication in embedded control systems.
For engineers reviewing the 74FCT245CTPYG datasheet, 74FCT245CTPYG pinout, 74FCT245CTPYG application, or 74FCT245CTPYG equivalent, key selection criteria include direction control via T/R input, 3-state output enable (OE active low), propagation delay ≤4.1 ns (A↔B), and compatibility with legacy TTL and modern CMOS buses.
Technical Context
The 74FCT245CTPYG implements an octal bidirectional bus interface using advanced dual-metal CMOS technology. Its transmit/receive (T/R) input controls data flow direction: T/R = HIGH enables A→B transfer; T/R = LOW enables B→A transfer. Output Enable (OE) is active-low and places both A and B ports in high-impedance state when asserted.
It meets JEDEC Standard 18 and supports live insertion via power-off disable outputs. Input leakage is ≤1 µA (max), and it delivers –15 mA IOH / 64 mA IOL drive strength under industrial conditions at VCC = 5.0V ±5%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0V ±5% - fixed single-rail operation compatible with legacy 5V TTL/CMOS systems |
| Propagation Delay | ≤4.1 ns (tPLH/tPHL, CL = 50 pF) - ensures sub-5 ns timing margin for 100+ MHz bus handshaking |
| Output Drive | –15 mA IOH / 64 mA IOL - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| Input Compatibility | TTL-level VIH ≥2.0 V, VIL ≤0.8 V - interoperable with standard 5V TTL logic families |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including factory automation and motor control |
| Leakage Current | ≤1 µA (IIH/IIL) - minimizes standby power and prevents false triggering on unterminated lines |
| Package | TSSOP-20 (PYG20) - surface-mount, 0.65 mm pitch, footprint-compatible with SOIC-20 but 30% smaller area |
Pinout & Package
74FCT245CTPYG is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP), designated PYG20 per Renesas ordering nomenclature. The package features gull-wing leads, 0.65 mm pitch, and thermal pad-less construction suitable for standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Active Low) | Global 3-state control: HIGH disables both A and B ports into high-Z; essential for bus arbitration |
| 2–9 | A0–A7 | Side-A bidirectional I/O: serve as inputs when receiving (B→A) or outputs when transmitting (A→B) |
| 10 | GND | Power ground reference for all internal logic and I/O stages |
| 11–18 | B0–B7 | Side-B bidirectional I/O: mirror A-side behavior with direction determined by T/R |
| 19 | T/R | Direction control: HIGH = A→B, LOW = B→A - asynchronous, no clock required |
| 20 | VCC | +5V supply rail - powers internal logic and output drivers; decoupling required near pin |
Key Features
| Feature | Design Value |
|---|---|
| True TTL-compatible I/O | VOH = 3.3V (typ.), VOL = 0.3V (typ.) at 5V - eliminates level-shifting between 74LS/74F and modern CMOS buses |
| High-current drive capability | 64 mA sink / 15 mA source per output - directly drives up to 10 standard TTL loads or long PCB traces |
| Live-insertion support | Outputs enter high-Z when VCC = 0 - enables hot-swap of daughterboards or field-replaceable modules |
| Low dynamic power consumption | ICCD ≤ 0.25 mA/MHz - reduces system-level heat generation in dense I/O expansion applications |
| MIL-STD-883 compliant variants available | 54FCT245CT derivative qualified to Class B - supports extended reliability requirements without redesign |
Applications
| Industrial PLC Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing a modern microcontroller-based CPU module to a legacy 8-bit parallel I/O backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge between mismatched voltage domains and timing protocols, synchronized only by OE and T/R control signals. Use Value: Eliminates need for discrete buffer arrays while maintaining <4.1 ns propagation delay for deterministic scan-cycle timing. | Use Scenario: Extending a 5V ISA or VMEbus slot with additional peripheral cards requiring isolated, direction-controlled data lanes. IC Role / Device Role / Timing Role: Octal bus transceiver enabling read/write handshaking between master and slave cards without shared clock domain. Use Value: Supports 64 mA per line to drive long bus stubs and daisy-chained peripherals while preserving signal integrity. |
| Motor Control I/O Expansion | Test Equipment Digital Pattern Interface |
Use Scenario: Adding isolated digital I/O for encoder feedback, limit switch monitoring, and PWM output routing in servo drive modules. IC Role / Device Role / Timing Role: Level-translating and direction-gated interface between FPGA-based motion controller and 5V industrial sensors/actuators. Use Value: Leverages ±1 µA input leakage and 3.3V VOH to reduce false triggers in electrically noisy motor cabinet environments. | Use Scenario: Connecting automated test equipment (ATE) pattern generators to DUTs with mixed-voltage I/O standards. IC Role / Device Role / Timing Role: Reconfigurable bidirectional data path allowing same hardware to perform stimulus delivery and response capture. Use Value: Enables sub-5 ns turnaround time between write/read phases, critical for high-speed functional test vector execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F245N | Slower propagation (≤12 ns), lower drive (–15 mA / 64 mA), no live-insertion support | Limited to static 5V systems; not rated for industrial temp range | Select when cost sensitivity outweighs timing and reliability requirements |
| 74LCX245MTCX | 3.3V-only supply (2.7–3.6V), higher speed (≤2.8 ns), lower drive (–24 mA / 24 mA) | Requires level-shifting for 5V bus interfacing; unsuitable for direct TTL replacement | Prefer for new 3.3V designs where power efficiency and speed supersede 5V compatibility |
Compared with SN74F245N and 74LCX245MTCX, the 74FCT245CTPYG uniquely balances 5V TTL compatibility, industrial temperature rating, sub-5 ns timing, and live-insertion capability-making it the only choice for upgrading legacy 5V backplanes without board redesign.
Availability
74FCT245CTPYG is available at Aetrix Electronics and suitable for industrial PLC backplanes, motor control I/O expansion, and legacy system bus extension requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74FCT245CTPYG 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 delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The 74FCT245CTPYG belongs to Renesas' legacy IDT logic portfolio, designed specifically for robust 5V bus bridging in harsh industrial environments where reliability, timing precision, and backward compatibility are mandatory.
FAQ
What is the operating voltage range for the 74FCT245CTPYG?
The 74FCT245CTPYG operates at a nominal VCC of 5.0V ±5%, specified over the full industrial temperature range (–40°C to +85°C). It is not rated for 3.3V operation. Absolute maximum VCC is 5.5V; applying voltage beyond this risks permanent damage. All DC and switching specifications-including VOH, VOL, and propagation delay-are guaranteed only within the 4.75V–5.25V window.
Does the 74FCT245CTPYG support live insertion?
Yes, the 74FCT245CTPYG supports live insertion due to its power-off disable outputs feature. When VCC = 0V, all outputs enter a high-impedance state regardless of OE or T/R states, preventing bus contention during hot-swap events. This behavior is verified per MIL-STD-883 Class B test methods and applies to both industrial (74FCT245CTPYG) and military (54FCT245CT) variants.
What is the maximum capacitive load the 74FCT245CTPYG can drive reliably?
The 74FCT245CTPYG is characterized for CL = 50 pF in switching tests, with propagation delay and edge rate specifications guaranteed under that condition. While it can physically drive heavier loads (e.g., >100 pF) due to its 64 mA IOL capability, signal integrity degrades beyond 50 pF-resulting in increased rise/fall times and potential setup/hold violations. For loads exceeding 50 pF, external series termination or buffer staging is recommended.
How does the T/R pin control data direction in the 74FCT245CTPYG?
In the 74FCT245CTPYG, the T/R pin is an asynchronous control input: when T/R = HIGH, data flows from A ports to B ports; when T/R = LOW, data flows from B ports to A ports. This direction change occurs immediately without clock or latency penalty. The OE pin must be LOW for either direction to be active; if OE = HIGH, both sides go high-Z regardless of T/R state.
Is the 74FCT245CTPYG RoHS compliant and lead-free?
Yes, the 74FCT245CTPYG is RoHS compliant and lead-free. Per Renesas' 2016 ordering information update (Document History), all current shipments use green (halogen-free) packaging with lead-free terminations. The "G" suffix in the part number confirms RoHS compliance, and the PYG20 package designation indicates lead-free matte tin plating on gull-wing leads.
74FCT245CTPYG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74FCT245CTPYG FAQ
1.How can I place an order for 74FCT245CTPYG through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT245CTPYG 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 74FCT245CTPYG reliable?
The price and inventory of 74FCT245CTPYG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT245CTPYG is usually 5 days.
3.What payment methods are accepted for 74FCT245CTPYG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT245CTPYG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT245CTPYG?
74FCT245CTPYG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT245CTPYG 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 74FCT245CTPYG?
For technical support, including 74FCT245CTPYG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT245CTPYG requirements.
6.How does Aetrix verify that 74FCT245CTPYG is sourced from the original manufacturer or authorized distributors?
All 74FCT245CTPYG 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 74FCT245CTPYG meets industry standards.
7.What is the process for return or replacement of 74FCT245CTPYG?
All 74FCT245CTPYG units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT245CTPYG, 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 74FCT245CTPYG part is unused and in its original packaging.
Return procedure for 74FCT245CTPYG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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