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Diodes Incorporated PI74FCT245ATQE
- Part No.:
- PI74FCT245ATQE
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI74FCT245ATQE.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,906
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Product details
Overview
PI74FCT245ATQE from Pericom Semiconductor is a fast CMOS octal bidirectional transceiver with TTL-compatible I/O, 20-pin TSSOP package, 3.8 ns max propagation delay (A-grade), 5 V supply, and industrial temperature range (–40°C to +85°C). It enables asynchronous two-way data transfer between buses in embedded control systems requiring low ground bounce and high noise immunity.
For engineers reviewing the PI74FCT245ATQE datasheet, PI74FCT245ATQE pinout, PI74FCT245ATQE application, or PI74FCT245ATQE equivalent, key selection criteria include direction control via T/R input, 3-state output enable (OE active LOW), bidirectional 8-bit bus isolation, and compatibility with legacy FAST™-series logic designs.
Technical Context
This device implements dual 8-bit bidirectional I/O ports (A0–A7 and B0–B7) controlled by independent OE (active LOW) and T/R (transmit/receive) inputs. Data flows A→B when T/R = HIGH and OE = LOW; B→A when T/R = LOW and OE = LOW; both sides enter high-impedance state when OE = HIGH.
It features hysteresis on all inputs (200 mV), TTL-level input thresholds (VIH = 2.0 V, VIL = 0.8 V), and low static power consumption (ICC ≤ 500 µA). Output drive strength supports 64 mA sink and 15 mA source at VOH ≥ 2.4 V and VOL ≤ 0.55 V under 5 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5.0 V ±5% - ensures compatibility with standard TTL/CMOS logic rails and stable operation across industrial voltage tolerances |
| Propagation Delay (tPLH/tPHL) | Max 3.8 ns at CL = 50 pF - enables reliable 200+ MHz bus handshaking in high-speed digital interfaces |
| Output Drive Strength | 64 mA sink / 15 mA source - sufficient to drive multiple TTL loads or terminate stubs without external buffers |
| Input Hysteresis | 200 mV - improves noise margin against EMI in electrically noisy industrial environments |
| Operating Temperature | –40°C to +85°C - certified for use in automotive body control modules and industrial PLC backplanes |
| Quiescent Current | ≤ 500 µA - reduces standby power in battery-backed or energy-sensitive applications |
| IOZ Leakage (Hi-Z) | ≤ 1 µA - prevents unintended current paths during bus arbitration or hot-swap events |
Pinout & Package
PI74FCT245ATQE is housed in a 20-pin TSSOP (Thin Shrink Small Outline Package), 173-mil wide, with 0.65 mm lead pitch and exposed thermal pad (non-electrical). Package meets JEDEC MO-153AC standards and supports reflow soldering per IPC/JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (T/R) | Direction Control Input | Active-HIGH selects A→B data flow; active-LOW selects B→A - enables full-duplex bus arbitration without external logic |
| 2–9 (A0–A7) | Side A Bidirectional I/O | Configurable as input or 3-state output depending on T/R and OE - connects to microcontroller data bus or FPGA side A |
| 10 (GND) | Ground Reference | Primary signal return path; decoupling capacitor must be placed within 5 mm for noise suppression |
| 11 (VCC) | Power Supply | +5 V supply rail; requires local 100 nF ceramic bypass capacitor adjacent to pin |
| 12 (OE) | Output Enable (Active LOW) | Disables both A and B ports into Hi-Z when HIGH - essential for bus sharing and multi-master arbitration |
| 13–20 (B0–B7) | Side B Bidirectional I/O | Configurable as input or 3-state output - interfaces with peripheral bus, memory expansion, or isolated subsystem |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input thresholds | VIH = 2.0 V, VIL = 0.8 V - ensures seamless interoperability with legacy 5 V microcontrollers and ASICs without level shifters |
| Low ground bounce outputs | Controlled edge rates and internal current limiting - suppresses simultaneous switching noise in dense PCB layouts |
| Hysteresis on all inputs | 200 mV threshold window - rejects sub-200 mV noise spikes common in motor-drive or relay-switching environments |
| Industrial temperature rating | –40°C to +85°C operation - validated for deployment in uncontrolled ambient enclosures like factory-floor HMIs and HVAC controllers |
| Pin compatibility with FAST™ series | Identical pinout to bipolar SN74F245 - allows drop-in upgrade to lower power, higher speed CMOS without PCB redesign |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Extension |
|---|---|
|
Use Scenario: Isolating CPU data bus from modular I/O expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge enabling real-time read/write access between ARM Cortex-M4 host and discrete 8-bit I/O modules. Use Value: 3.8 ns propagation delay ensures deterministic response within 10 µs scan cycles; OE-controlled Hi-Z prevents bus contention during module hot-swap. |
Use Scenario: Extending 8-bit parallel bus of 8051-based sensor acquisition node to external ADC/DAC and EEPROM arrays. IC Role / Device Role / Timing Role: Direction-controlled transceiver synchronizing data transfers between MCU and peripheral ICs using shared address/data multiplexing. Use Value: TTL-level compatibility eliminates level-shifter components; hysteresis prevents false reads during ESD-prone field wiring. |
| Automotive Body Control Module | Test Equipment Digital I/O Card |
|
Use Scenario: Interfacing infotainment SoC with legacy CAN/LIN gateway MCU over shared 5 V data bus in vehicle door control unit. IC Role / Device Role / Timing Role: Bus isolator managing bidirectional firmware update packets and sensor status polling between domains. Use Value: –40°C to +85°C rating meets AEC-Q100 Grade 3 requirements; low ICC supports always-on diagnostic mode with <1 mW standby draw. |
Use Scenario: Configurable digital stimulus/response channel in automated test equipment rack card supporting DUT interface emulation. IC Role / Device Role / Timing Role: Reconfigurable 8-bit I/O port toggling between input capture and pattern generation modes under FPGA control. Use Value: OE and T/R pins allow dynamic reassignment of I/O direction per test sequence; 64 mA drive supports direct LED/relay actuation. |
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™ technology; higher ICC (20 mA typical), slower tPLH (10 ns), no hysteresis | Limited to commercial temp (0°C to +70°C); unsuitable for extended ambient or low-power designs | Select only if legacy board reuse mandates identical electrical behavior and thermal derating is acceptable |
| 74LVC245APW | 3.3 V only; 3.3 V I/O; 5 V tolerant inputs; 3.5 ns max delay; smaller TSSOP-20 (4.4 mm width) | Requires level translation for 5 V systems; not pin-compatible due to different pin mapping (OE on pin 19 vs. 12) | Prefer for new 3.3 V designs where space and power efficiency outweigh 5 V compatibility needs |
Compared with SN74F245N and 74LVC245APW, PI74FCT245ATQE uniquely delivers 5 V TTL compatibility, industrial temperature support, and FAST™ pinout alignment - making it optimal for upgrading legacy 5 V control systems without compromising timing or reliability.
Availability
PI74FCT245ATQE is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, legacy microcontroller bus extensions, and automated test equipment requiring stable component supply and long-term lifecycle assurance.
Supply support for PI74FCT245ATQE 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-performance interface, timing, and signal integrity solutions, acquired by Diodes Incorporated in 2016; its FCT logic portfolio remains actively supported and qualified.
The PI74FCT245ATQE belongs to the FCT (Fast CMOS Technology) logic family, designed specifically for drop-in replacement of bipolar FAST™ devices in 5 V systems demanding lower power, higher speed, and improved noise immunity.
FAQ
What is the function of the T/R pin on PI74FCT245ATQE?
The T/R (Transmit/Receive) pin controls data direction: when HIGH, data flows from Side A (pins 2–9) to Side B (pins 13–20); when LOW, data flows from Side B to Side A. This single-pin control eliminates need for external direction logic and supports dynamic bus arbitration in real-time systems.
Can PI74FCT245ATQE operate at 3.3 V supply?
No - PI74FCT245ATQE is specified only for 5.0 V ±5% operation. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive characteristics are optimized for 5 V TTL logic families. Attempting 3.3 V operation results in undefined logic states and potential damage due to insufficient VCC margin for internal circuit biasing.
How does the OE pin affect bus contention in multi-transceiver systems?
When OE is HIGH, both Side A and Side B ports enter high-impedance state, effectively disconnecting the device from both buses. In multi-transceiver configurations, synchronizing OE across devices prevents simultaneous drive conflicts - critical for shared-bus architectures like ISA or custom backplanes where only one transceiver may drive at a time.
Is PI74FCT245ATQE RoHS compliant and lead-free?
Yes - PI74FCT245ATQE (TSSOP package code 'Q') is manufactured with lead-free terminations and complies with RoHS Directive 2011/65/EU. The device uses matte tin plating over copper leads and meets JEDEC JS-001 electrostatic discharge standards, with qualification data available in Diodes Incorporated's product change notices (PCNs) for legacy Pericom parts.
PI74FCT245ATQE 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
PI74FCT245ATQE FAQ
1.How can I place an order for PI74FCT245ATQE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT245ATQE 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 PI74FCT245ATQE reliable?
The price and inventory of PI74FCT245ATQE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT245ATQE is usually 5 days.
3.What payment methods are accepted for PI74FCT245ATQE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT245ATQE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT245ATQE?
PI74FCT245ATQE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT245ATQE 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 PI74FCT245ATQE?
For technical support, including PI74FCT245ATQE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT245ATQE requirements.
6.How does Aetrix verify that PI74FCT245ATQE is sourced from the original manufacturer or authorized distributors?
All PI74FCT245ATQE 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 PI74FCT245ATQE meets industry standards.
7.What is the process for return or replacement of PI74FCT245ATQE?
All PI74FCT245ATQE units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT245ATQE, 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 PI74FCT245ATQE part is unused and in its original packaging.
Return procedure for PI74FCT245ATQE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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