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Diodes Incorporated PI74FCT2245CTQE
- Part No.:
- PI74FCT2245CTQE
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI74FCT2245CTQE.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,350
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Product details
Overview
PI74FCT2245CTQE from Pericom Semiconductor is a fast CMOS octal bidirectional transceiver with 25-Ω series output termination, TTL-compatible I/O, and industrial temperature range (–40°C to +85°C). It enables asynchronous two-way data transfer between 8-bit buses, supports direction control via T/R input, and features high-impedance outputs when OE is HIGH. Used in bus isolation and level-shifting applications in embedded controllers and industrial backplanes.
For engineers reviewing the PI74FCT2245CTQE datasheet, PI74FCT2245CTQE pinout, PI74FCT2245CTQE application, or PI74FCT2245CTQE equivalent, key selection criteria include 25-Ω integrated series termination, propagation delay ≤4.1 ns (max), output drive capability of 64 mA (IOL), and compatibility with 5 V TTL logic families in space-constrained QSOP-20 layouts.
Technical Context
This device implements an 8-bit bidirectional bus transceiver with independent transmit/receive direction control and 3-state output enable. Its internal 25-Ω series resistors on all A and B port outputs suppress signal reflections without external termination components.
The T/R input determines data flow direction: HIGH enables A→B transmission; LOW enables B→A reception. OE (active LOW) places both ports in high-impedance state when asserted, enabling bus sharing across multiple devices on the same net.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | ≤4.1 ns max at CL = 50 pF - ensures sub-5 ns timing margin for 100+ MHz bus clocking. |
| Output Drive (IOL) | 64 mA at VOL ≤ 0.50 V - supports direct driving of 50 Ω transmission lines or TTL loads. |
| Supply Voltage (VCC) | 5.0 V ±5% - compatible with standard 5 V logic rails and legacy industrial systems. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade operation without derating. |
| Input Hysteresis (VH) | 200 mV - improves noise immunity on noisy bus environments like motor control backplanes. |
| Quiescent Current (ICC) | 0.1–500 µA - enables low-static-power operation in always-on monitoring subsystems. |
| Output Termination | Integrated 25 Ω series resistor on all A/B pins - eliminates need for 8 external SMD resistors. |
Pinout & Package
PI74FCT2245CTQE is housed in a 20-pin plastic QSOP (Quarter-Size Outline Package), 150-mil wide body, with 0.65 mm lead pitch and gull-wing leads. The package meets JEDEC MO-137 standards and supports reflow soldering per IPC/JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (T/R) | Direction Control Input | HIGH selects A→B data flow; LOW selects B→A - enables full-duplex bus arbitration without external logic. |
| 2–9 (A0–A7) | Side A Bidirectional I/O | 8-bit port configurable as input or 3-state output - connects to microcontroller data bus or FPGA side A interface. |
| 10 (GND) | Ground Reference | Primary ground return for all I/O and core logic - must be low-inductance connection to minimize ground bounce. |
| 11 (VCC) | Power Supply | 5 V supply for internal logic and output drivers - requires local 0.1 µF ceramic decoupling adjacent to pin. |
| 12 (OE) | Output Enable (Active LOW) | Drives A/B ports into Hi-Z when HIGH - allows multi-device bus sharing and hot-swap isolation. |
| 13–20 (B0–B7) | Side B Bidirectional I/O | 8-bit port mirroring A-side functionality - interfaces to peripheral bus, memory module, or isolated subsystem. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25 Ω Series Output Termination | Eliminates 16 external termination resistors, reduces PCB area and BOM count in high-speed bus designs. |
| TTL-Compatible I/O Levels | VIH = 2.0 V min, VIL = 0.8 V max - interoperable with legacy 5 V microcontrollers, CPLDs, and ASICs. |
| Low Ground Bounce Outputs | Minimizes simultaneous switching noise during multi-bit transitions - critical for mixed-signal system stability. |
| Hysteresis on All Inputs | 200 mV threshold window - rejects EMI-induced glitches on long traces or unshielded cables. |
| Industrial Temperature Range | –40°C to +85°C operation without performance degradation - suitable for factory automation and outdoor edge nodes. |
Applications
| Industrial PLC Backplane Interface | Embedded Controller Bus Isolation |
|---|---|
|
Use Scenario: Interfacing a 5 V ARM-based controller CPU bus to a legacy 8-bit I/O expansion module over a 15 cm PCB trace. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing A→B (CPU→peripheral) and B→A (peripheral→CPU) data flow under software-controlled T/R. Use Value: Integrated 25 Ω termination prevents overshoot/undershoot on 10–20 MHz burst transfers, eliminating signal integrity tuning effort. |
Use Scenario: Isolating a real-time DSP's data bus from a shared diagnostic UART and flash programming interface. IC Role / Device Role / Timing Role: Directionally controlled bus buffer enabling time-multiplexed access to dual peripherals without contention. Use Value: OE-controlled Hi-Z state allows safe hot-plug insertion of debug tools while main system remains operational. |
| Automated Test Equipment (ATE) Signal Routing | Motor Drive Control Board Data Exchange |
|
Use Scenario: Routing test pattern data between FPGA pattern generator and DUT interface board using 20 cm ribbon cable. IC Role / Device Role / Timing Role: High-speed bidirectional repeater with matched impedance to maintain signal fidelity up to 25 MHz. Use Value: Sub-4.1 ns propagation delay ensures setup/hold timing compliance across 100+ pin DUT interfaces. |
Use Scenario: Exchanging status and command words between MCU and isolated gate driver ICs in a 3-phase inverter. IC Role / Device Role / Timing Role: Noise-immune bus translator operating in electrically noisy motor control environment. Use Value: 200 mV input hysteresis rejects EMI from PWM switching, preventing spurious register writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT245CTQ | No integrated 25 Ω termination; higher VOL (0.55 V) at 64 mA; identical pinout and timing. | Requires external 25–33 Ω series resistors per line for clean signal integrity. | Select when cost sensitivity outweighs PCB area savings and termination simplicity. |
| 74LVC245APW | 3.3 V only; no built-in termination; lower drive (24 mA); different pinout (TSSOP-20). | Not pin-compatible; requires level-shifting for 5 V systems; unsuitable for legacy 5 V backplanes. | Choose only for new 3.3 V designs where voltage scaling and lower power dominate over backward compatibility. |
Compared with SN74FCT245CTQ and 74LVC245APW, PI74FCT2245CTQE uniquely delivers 5 V TTL compatibility, integrated termination, and drop-in replacement for FCT245 footprints-reducing layout iterations and validation time in industrial retrofit projects.
Availability
PI74FCT2245CTQE is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded controller bus isolation, and motor drive control boards requiring stable component supply and long-term lifecycle support.
Supply support for PI74FCT2245CTQE 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
Pericom Semiconductor was a fabless provider of high-speed interface and timing solutions, acquired by Diodes Incorporated in 2016; its FCT logic portfolio remains actively supported and manufactured.
The PI74FCT2245T series targets industrial and communications systems needing robust 5 V bidirectional bus interfacing with reduced signal integrity risk - emphasizing integration, noise immunity, and drop-in upgrade paths from bipolar FAST logic.
FAQ
Is PI74FCT2245CTQE pin-compatible with standard 74FCT245 devices?
Yes - PI74FCT2245CTQE uses identical 20-pin QSOP pinout and function mapping as PI74FCT245CTQE, differing only in integrated 25 Ω output resistors. No PCB redesign is needed when upgrading from non-terminated variants for improved signal integrity.
What is the maximum data rate supported by PI74FCT2245CTQE?
Based on its 4.1 ns max propagation delay and 50 pF load condition, PI74FCT2245CTQE reliably supports data rates up to 100 Mbps in point-to-point configurations. For longer traces or stubbed topologies, eye diagram validation at target bit rate is recommended.
Can OE and T/R be driven directly from a 3.3 V microcontroller GPIO?
Yes - VIH is guaranteed at 2.0 V minimum and VIL at 0.8 V maximum, making PI74FCT2245CTQE compatible with 3.3 V logic outputs without level shifters. However, ensure VCC remains at 5.0 V for correct output drive strength and voltage levels.
Does the 25 Ω series resistor affect DC voltage levels at the load?
No - the 25 Ω resistor is placed between the output driver and the pin; it does not alter VOH/VOL specifications under static conditions. Its effect is purely dynamic, reducing edge-induced ringing on transmission lines with characteristic impedance near 50 Ω.
PI74FCT2245CTQE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm 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-QSOP
PI74FCT2245CTQE FAQ
1.How can I place an order for PI74FCT2245CTQE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT2245CTQE 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 PI74FCT2245CTQE reliable?
The price and inventory of PI74FCT2245CTQE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT2245CTQE is usually 5 days.
3.What payment methods are accepted for PI74FCT2245CTQE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT2245CTQE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT2245CTQE?
PI74FCT2245CTQE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT2245CTQE 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 PI74FCT2245CTQE?
For technical support, including PI74FCT2245CTQE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT2245CTQE requirements.
6.How does Aetrix verify that PI74FCT2245CTQE is sourced from the original manufacturer or authorized distributors?
All PI74FCT2245CTQE 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 PI74FCT2245CTQE meets industry standards.
7.What is the process for return or replacement of PI74FCT2245CTQE?
All PI74FCT2245CTQE units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT2245CTQE, 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 PI74FCT2245CTQE part is unused and in its original packaging.
Return procedure for PI74FCT2245CTQE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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