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Diodes Incorporated PI74FCT240ATQ
- Part No.:
- PI74FCT240ATQ
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI74FCT240ATQ.pdf
- Description:
- IC BUFFER INVERT 5.25V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,705
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Product details
Overview
PI74FCT240ATQ from Pericom Semiconductor is an octal inverting 3-state buffer/line driver IC with TTL-compatible inputs and outputs, built-in 25 Ω series output resistors for reflection suppression, 4.8 ns max propagation delay (at 5 V), and industrial temperature range (–40°C to +85°C). It functions as a bidirectional bus interface component in high-speed digital systems requiring noise-immune signal routing.
For engineers reviewing the PI74FCT240ATQ datasheet, PI74FCT240ATQ pinout, PI74FCT240ATQ application, or PI74FCT240ATQ equivalent, key selection criteria include its inverting logic function, dual active-low enable pins (OEA/OEB), 25 Ω integrated output termination, low ground bounce, and compatibility with FAST™-series PCB layouts.
Technical Context
This device implements two independent 4-bit inverting buffer sections, each controlled by separate active-low 3-state enables (OEA for A-side, OEB for B-side). All eight outputs feature on-die 25 Ω series resistors to dampen transmission-line reflections without external components.
It operates at 5.0 V ±5%, supports TTL-level input thresholds (VIH = 2.0 V, VIL = 0.8 V), delivers VOH ≥ 2.4 V at –15 mA and VOL ≤ 0.50 V at 12 mA (25 Ω series), and exhibits 200 mV input hysteresis for noise immunity on noisy buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with dual 3-state control (OEA/OEB active-low) |
| Propagation Delay | Max 4.8 ns (tPLH/tPHL, CL = 50 pF, VCC = 5 V) - enables >200 MHz bus operation |
| Output Drive | 12 mA sink at VOL ≤ 0.50 V (25 Ω series resistor integrated) - eliminates external termination |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures robust TTL-level interoperability |
| Supply Range | 5.0 V ±5% (4.75–5.25 V) - compatible with standard 5 V digital rails |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and computing applications |
| Quiescent Current | Max 500 µA - ultra-low static power for always-on bus interfaces |
Pinout & Package
PI74FCT240ATQ is housed in a 20-pin plastic TQSOP (Thin Quad Small Outline Package), 150 mil width, with gull-wing leads and standard JEDEC MO-153 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA, OEB | Active-low 3-state enable inputs - independently disable A-side (pins 2–9) or B-side (pins 12–19) outputs |
| 2–9 | DA0–DA3, OB0–OB3 | A-side inputs (DAx) and B-side outputs (OBx) - inverting path: DAx → OBx |
| 12–19 | OA0–OA3, DB0–DB3 | A-side outputs (OAx) and B-side inputs (DBx) - inverting path: DBx → OAx |
| 10 | GND | Digital ground reference - decoupling capacitor required near pin for noise control |
| 20 | VCC | 5 V power supply - requires local 0.1 µF ceramic bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25 Ω series output resistors | Eliminates need for external termination resistors on PCB traces, reducing BOM count and layout complexity |
| TTL-compatible I/O levels | Direct interface with legacy 5 V microcontrollers, FPGAs, and memory devices without level-shifting |
| Low ground bounce | Minimizes simultaneous switching noise during multi-bit transitions, improving signal integrity on shared buses |
| Input hysteresis (200 mV) | Rejects slow-rising or noisy input edges, preventing metastability in asynchronous bus environments |
| Pin compatibility with FAST™ bipolar series | Drop-in upgrade path for existing designs - same footprint and logic behavior at higher speed and lower power |
Applications
| Memory Address Bus Driver | System Clock Distribution Buffer |
|---|---|
|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing fan-out amplification and noise-suppressed signal routing. Use Value: Integrated 25 Ω resistors suppress reflections on long parallel traces, maintaining setup/hold timing margins across all address bits. |
Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., ADC, DAC, UART). IC Role / Device Role / Timing Role: Low-skew, inverting buffer with fast enable/disable for clock gating. Use Value: 4.8 ns max propagation delay and 4.8 ns max output disable time support precise clock edge control in real-time systems. |
| Backplane Data Bus Isolator | Legacy ISA/PCI Local Bus Interface |
|
Use Scenario: Isolating data lanes between CPU and backplane modules in modular industrial controllers. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling controlled data flow direction and bus contention avoidance. Use Value: Dual independent enables (OEA/OEB) allow asymmetric control of read/write paths, simplifying arbitration logic. |
Use Scenario: Interfacing modern logic to legacy ISA or PCI bus slots requiring TTL-level drive and strict timing compliance. IC Role / Device Role / Timing Role: High-drive octal buffer meeting original specification voltage/current requirements. Use Value: 12 mA output drive at 0.50 V VOL ensures reliable logic LOW recognition under full bus loading per PCI Rev 2.1 specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74F240SCX (ON Semiconductor) | No integrated 25 Ω resistors; requires external termination; higher ICCQ (1.5 mA typical) | Lacks on-die noise suppression - unsuitable for un-terminated long traces | Select when board-level termination is already implemented and legacy footprint reuse is critical |
| SN74F240N (Texas Instruments) | DIP-20 only; no TQSOP option; slower max tPD (9 ns); no hysteresis | Not suitable for space-constrained or high-density surface-mount designs | Select only for through-hole prototyping or legacy repair where TQSOP is unavailable |
Compared with 74F240SCX and SN74F240N, PI74FCT240ATQ delivers superior signal integrity via integrated termination, lower static power, and tighter timing - making it optimal for new 5 V industrial bus designs where layout density and EMI control matter.
Availability
PI74FCT240ATQ is available at Aetrix Electronics and suitable for memory address buffering, system clock distribution, backplane bus isolation, and legacy ISA/PCI interface applications requiring stable component supply and industrial temperature support.
Supply support for PI74FCT240ATQ 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 logic portfolio remains widely deployed in industrial and communications infrastructure.
The PI74FCT2XXX series was designed specifically for high-speed 5 V bus interfacing - emphasizing low-noise drive, TTL compatibility, and drop-in replacement capability for legacy bipolar logic in demanding embedded systems.
FAQ
Is PI74FCT240ATQ pin-compatible with standard 74F240 devices?
Yes - PI74FCT240ATQ uses identical 20-pin TQSOP pinout and logic function mapping as 74F240, including OEA/OEB enables and inverting A/B channel pairing. Its electrical enhancements (25 Ω resistors, lower ICCQ, hysteresis) do not affect mechanical or logical compatibility.
Can PI74FCT240ATQ operate at 3.3 V?
No - this device is specified only for 5.0 V ±5% operation. Its TTL input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive characteristics are optimized for 5 V rails; operation below 4.75 V violates absolute maximum ratings and invalidates AC/DC specifications.
What is the purpose of the dual enable pins OEA and OEB?
OEA controls the A-side outputs (OA0–OA3), while OEB controls the B-side outputs (OB0–OB3). This allows independent 3-state control of two 4-bit groups - enabling flexible bus arbitration, directional data flow, or partial bus isolation without external logic.
Does PI74FCT240ATQ require external pull-up or pull-down resistors on enable pins?
No - OEA and OEB have internal weak pull-downs (IIL = –1 µA max at GND), ensuring defined LOW state when unconnected. However, for robust noise immunity in high-EMI environments, a 10 kΩ pull-down to GND is recommended per enable pin.
PI74FCT240ATQ 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:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- 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
PI74FCT240ATQ FAQ
1.How can I place an order for PI74FCT240ATQ through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT240ATQ 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 PI74FCT240ATQ reliable?
The price and inventory of PI74FCT240ATQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT240ATQ is usually 5 days.
3.What payment methods are accepted for PI74FCT240ATQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT240ATQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT240ATQ?
PI74FCT240ATQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT240ATQ 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 PI74FCT240ATQ?
For technical support, including PI74FCT240ATQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT240ATQ requirements.
6.How does Aetrix verify that PI74FCT240ATQ is sourced from the original manufacturer or authorized distributors?
All PI74FCT240ATQ 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 PI74FCT240ATQ meets industry standards.
7.What is the process for return or replacement of PI74FCT240ATQ?
All PI74FCT240ATQ units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT240ATQ, 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 PI74FCT240ATQ part is unused and in its original packaging.
Return procedure for PI74FCT240ATQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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