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Diodes Incorporated PI74FCT245TQE
- Part No.:
- PI74FCT245TQE
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI74FCT245TQE.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,913
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Product details
Overview
PI74FCT245TQE from Pericom Semiconductor is an octal bidirectional transceiver IC used for asynchronous two-way data bus interfacing between TTL-compatible systems. It features 8-bit A/B port pairs, active-low 3-state output enable (OE), direction control via T/R input, 5V supply operation, and supports industrial temperature range (–40°C to +85°C). It enables bus isolation in microcontroller peripheral expansion and memory-mapped I/O subsystems.
For engineers reviewing the PI74FCT245TQE datasheet, PI74FCT245TQE pinout, PI74FCT245TQE application, or PI74FCT245TQE equivalent, key selection criteria include propagation delay (≤7.0 ns), output drive strength (64 mA sink), low static current (≤500 µA), TTL-compatible I/O levels, and 20-pin QSOP package compatibility with legacy FAST™-series layouts.
Technical Context
This device implements dual 8-bit bidirectional data paths controlled by independent OE (active-low) and T/R (transmit/receive) logic inputs. Data flows from Side A to Side B when T/R = HIGH and OE = LOW; reverse flow occurs when T/R = LOW and OE = LOW. When OE = HIGH, both A and B ports enter high-impedance state regardless of T/R level.
It uses Fast CMOS technology with hysteresis on all inputs (200 mV), low ground bounce outputs, and guaranteed TTL-level compatibility (VIH = 2.0 V, VIL = 0.8 V). The PI74FCT245TQE variant lacks built-in 25 Ω series termination - unlike the PI74FCT2245T - making external impedance matching necessary in high-speed routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0 V ±5% - fixed single-supply operation compatible with standard TTL/CMOS logic rails |
| tPLH / tPHL | ≤7.0 ns at CL = 50 pF - ensures sub-10 ns bidirectional propagation for ≤70 MHz bus timing budgets |
| IOL / IOH | 64 mA sink / –15 mA source - drives standard TTL loads without external buffers |
| ICC Quiescent | ≤500 µA - enables low-power standby in battery-backed or energy-sensitive systems |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded control and automation environments |
| Input Hysteresis | 200 mV - improves noise immunity on shared or long-trace control lines like OE and T/R |
| VIH / VIL | 2.0 V / 0.8 V - guarantees reliable recognition of TTL logic levels across voltage and temperature |
Pinout & Package
PI74FCT245TQE is housed in a 20-pin plastic QSOP (Quarter Size Outline Package) with 0.635 mm pitch, 3.99 mm body width, 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 enables A→B data flow; LOW enables B→A - critical for half-duplex bus arbitration |
| 2–9 (A0–A7) | Side A bidirectional I/O | Configurable as inputs or 3-state outputs depending on T/R and OE - connects to microcontroller data bus |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic - requires low-inductance PCB connection |
| 11 (VCC) | Power supply | +5 V supply for core logic and output drivers - decoupling capacitor (0.1 µF) required adjacent to pin |
| 12 (OE) | Output enable (active LOW) | HIGH forces A/B ports into Hi-Z - enables bus sharing among multiple transceivers or peripherals |
| 13–20 (B0–B7) | Side B bidirectional I/O | Paired with A0–A7; direction determined by T/R - interfaces to peripheral or memory bus segment |
Key Features
| Feature | Design Value |
|---|---|
| Pin compatibility with bipolar FAST™ series | Enables drop-in replacement in legacy designs without layout change or timing recalibration |
| TTL input/output voltage levels | Eliminates level-shifting components when interfacing with 5 V microcontrollers, CPLDs, or legacy ASICs |
| Low ground bounce outputs | Reduces simultaneous switching noise (SSN) in multi-bit bus transitions, improving signal integrity |
| Hysteresis on all inputs | Prevents chatter on slow-rising or noisy control signals such as OE and T/R in electrically harsh environments |
| Industrial temperature range | Validated operation from –40°C to +85°C supports deployment in factory automation, motor drives, and outdoor equipment |
Applications
| Microcontroller Bus Expansion | Memory-Mapped I/O Interface |
|---|---|
|
Use Scenario: Expanding GPIO or data bus width of an 8-bit MCU (e.g., ATmega128, PIC18F) to connect additional peripherals. IC Role / Device Role / Timing Role: Bidirectional data bridge between MCU data bus (Side A) and peripheral bus (Side B), synchronized to address strobes. Use Value: Enables seamless 8-bit parallel expansion without software overhead or clock domain crossing logic. |
Use Scenario: Connecting an FPGA or ASIC to off-chip SRAM or EPROM using shared address/data multiplexing. IC Role / Device Role / Timing Role: Isolates memory data bus during read/write cycles; direction controlled by RD/WR strobes mapped to T/R and OE. Use Value: Prevents bus contention during memory access while maintaining full 8-bit throughput and <7 ns latency. |
| Industrial PLC Backplane Interface | Legacy ISA Bus Signal Conditioning |
|
Use Scenario: Interfacing modular I/O cards to a central controller backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Provides galvanically isolated (via external optocouplers) bidirectional data transfer between card and backplane buses. Use Value: Supports hot-swap-safe bus arbitration via OE-controlled Hi-Z state and robust noise immunity via 200 mV hysteresis. |
Use Scenario: Adapting vintage ISA bus signals (e.g., from PC/104 modules) to modern embedded host processors. IC Role / Device Role / Timing Role: Buffers and translates ISA data bus (D0–D7) between 5 V TTL domains while preserving timing margins. Use Value: Maintains ISA-compatible setup/hold times with ≤7 ns propagation and 64 mA drive for legacy load capacitance. |
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 | Bipolar FAST™ design; higher ICC (≈30 mA quiescent), slower tPLH (≈10 ns), no hysteresis | Higher power draw and lower noise margin limit use in dense or thermally constrained layouts | Select only if legacy board footprint mandates identical pinout and speed margin allows ≥10 ns delay |
| 74LCX245MTCX | Lower VCC range (2.0–3.6 V); 3.3 V tolerant I/O; 5 V I/O capable; 3.5 ns tPLH | Requires level translation for 5 V-only systems; superior for mixed-voltage or low-power designs | Prefer for new 3.3 V system designs where power efficiency and speed outweigh 5 V native compatibility |
Compared with SN74F245N, PI74FCT245TQE delivers 30% faster propagation and 60× lower quiescent current; versus 74LCX245MTCX, it offers native 5 V operation and stronger 64 mA drive but lacks 3.3 V logic compatibility.
Availability
PI74FCT245TQE is available at Aetrix Electronics and suitable for microcontroller bus expansion, memory-mapped I/O interface, and industrial PLC backplane applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for PI74FCT245TQE 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 specializing in high-speed interface, timing, and signal-integrity solutions before its acquisition by Diodes Incorporated in 2016. Its products target industrial, computing, and communications infrastructure.
The PI74FCT family delivers Fast CMOS performance with TTL compatibility, designed specifically for robust 5 V bus interfacing in noise-prone industrial and legacy-system upgrade applications.
FAQ
What is the maximum capacitive load the PI74FCT245TQE can drive reliably?
The device is characterized for CL = 50 pF in switching tests, with tPLH/tPHL specified up to that load. Driving >50 pF may increase propagation delay beyond 7.0 ns and raise ground bounce; for >75 pF, external series termination or reduced slew rate design is recommended.
Can PI74FCT245TQE operate with VCC = 3.3 V?
No - the PI74FCT245TQE is specified only for VCC = 5.0 V ±5% (4.75 V to 5.25 V). At 3.3 V, VIH/VIL thresholds and output drive capability fall outside specification; use 74LCX245 or 74ALVC245 for 3.3 V operation.
Is the T/R pin latched or level-sensitive?
T/R is purely level-sensitive - data direction changes immediately upon T/R transition while OE is LOW. There is no internal latch or edge-triggered behavior; direction follows T/R state in real time with typical 4–7 ns delay relative to T/R edge.
Does PI74FCT245TQE require external pull-up or pull-down resistors on OE or T/R?
Not strictly required, but recommended: OE should be pulled HIGH (via 10 kΩ to VCC) when unused to ensure Hi-Z default state; T/R may float if direction is fixed, but 10 kΩ pull-up or pull-down improves noise immunity in electrically noisy industrial environments.
PI74FCT245TQE 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
PI74FCT245TQE FAQ
1.How can I place an order for PI74FCT245TQE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT245TQE 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 PI74FCT245TQE reliable?
The price and inventory of PI74FCT245TQE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT245TQE is usually 5 days.
3.What payment methods are accepted for PI74FCT245TQE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT245TQE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT245TQE?
PI74FCT245TQE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT245TQE 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 PI74FCT245TQE?
For technical support, including PI74FCT245TQE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT245TQE requirements.
6.How does Aetrix verify that PI74FCT245TQE is sourced from the original manufacturer or authorized distributors?
All PI74FCT245TQE 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 PI74FCT245TQE meets industry standards.
7.What is the process for return or replacement of PI74FCT245TQE?
All PI74FCT245TQE units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT245TQE, 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 PI74FCT245TQE part is unused and in its original packaging.
Return procedure for PI74FCT245TQE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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