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Diodes Incorporated PI74FCT240ATS
- Part No.:
- PI74FCT240ATS
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PI74FCT240ATS.pdf
- Description:
- IC BUFFER INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,856
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Product details
Overview
PI74FCT240ATS from Pericom Semiconductor is an octal inverting 3-state buffer/line driver IC designed for high-speed bus driving in 5V TTL-compatible systems. It features built-in 25Ω series output resistors, TTL-level inputs/outputs, and operates across –40°C to +85°C. Key confirmed parameters: propagation delay ≤3.6 ns (max, DT grade), output drive up to 64 mA sink, and quiescent current ≤500 µA.
For engineers reviewing the PI74FCT240ATS datasheet, PI74FCT240ATS pinout, PI74FCT240ATS application, or PI74FCT240ATS equivalent, this device is selected for low-noise, high-density board layouts where controlled-impedance termination is required without external resistors - especially in memory address buffering and system clock distribution.
Technical Context
The PI74FCT240ATS implements dual 4-bit inverting buffers with independent active-low 3-state enable controls (OEA and OEB). Each output includes a monolithic 25Ω series resistor to suppress transmission-line reflections, eliminating discrete termination components. Input hysteresis (200 mV) enhances noise immunity on slow-rising signals.
It uses advanced 0.6/0.8 µm CMOS technology to achieve FAST™-compatible pinout while delivering higher speed (≤3.6 ns tPLH/tPHL) and lower static power than bipolar equivalents. All outputs are fully specified for 64 mA sink capability at VOL ≤0.55 V, supporting direct connection to 50 Ω transmission lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with dual 3-state enables (OEA/OEB active-low) |
| Propagation Delay | ≤3.6 ns max (tPLH/tPHL, DT grade, CL = 50 pF) - enables >270 MHz bus operation |
| Output Drive | 64 mA sink / 15 mA source - drives standard 50 Ω PCB traces without external termination |
| Integrated Termination | 25 Ω series resistor per output - eliminates need for external resistors and saves board space |
| Supply Voltage | 5.0 V ±5% - compatible with legacy TTL and mixed-voltage 5V systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications |
| Input Hysteresis | 200 mV - rejects noise on slow or noisy control lines (e.g., reset, enable signals) |
Pinout & Package
PI74FCT240ATS is supplied in a 20-pin plastic TSSOP (173 mil width), designated as package code 'L' per Pericom documentation. Pin numbering follows standard dual-inline orientation with GND (Pin 10) and VCC (Pin 11) centrally located.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEA | Active-low 3-state enable A | Controls outputs OB0–OB3; low enables, high places in high-impedance state |
| OEB | Active-low 3-state enable B | Controls outputs OA0–OA3; independent of OEA for flexible bus partitioning |
| DA0–DA3 | Data inputs A | Invert and drive corresponding OA0–OA3 outputs when OEB = L |
| DB0–DB3 | Data inputs B | Invert and drive corresponding OB0–OB3 outputs when OEA = L |
| OA0–OA3 | Inverted outputs A | Active-low buffered outputs with integrated 25 Ω series resistor |
| OB0–OB3 | Inverted outputs B | Active-low buffered outputs with integrated 25 Ω series resistor |
| GND | Ground reference | Pin 10 - primary return path for all I/O and supply currents |
| VCC | Power supply | Pin 11 - supplies core logic and output drivers at 5.0 V ±5% |
Key Features
| Feature | Design Value |
|---|---|
| On-die 25 Ω series termination | Reduces signal reflections on PCB traces - eliminates 8 external resistors and associated layout complexity |
| TTL-compatible I/O levels | Accepts standard TTL input thresholds (VIH ≥2.0 V, VIL ≤0.8 V) and drives TTL loads directly |
| Low ground bounce | Optimized output switching architecture minimizes simultaneous switching noise - critical for stable multi-bit buses |
| Industrial temperature range | Validated operation from –40°C to +85°C - suitable for non-automotive industrial control and networking hardware |
| Pin compatibility with FAST™ logic | Direct drop-in replacement for bipolar 74F240 in existing designs - no PCB redesign needed |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
|
Use Scenario: Driving 16-bit address bus between microcontroller and SRAM/Flash memory. IC Role / Device Role / Timing Role: Inverting buffer with dual 3-state enables isolates memory during DMA cycles and prevents bus contention. Use Value: 3.6 ns max propagation delay ensures setup/hold timing margin at 100 MHz bus speeds; integrated 25 Ω resistors suppress ringing on long address traces. |
Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., UART, SPI, timers). IC Role / Device Role / Timing Role: Low-skew, high-drive buffer replicates clock signal with matched delay paths across all 8 outputs. Use Value: Matched tPLH/tPHL (≤3.6 ns) and low output skew (<0.5 ns) maintain inter-peripheral clock alignment; 64 mA drive supports fanout to 8+ CMOS loads. |
| Backplane Data Bus Interface | Legacy ISA/PCI Bus Driver |
|
Use Scenario: Interfacing a local processor bus to a 32-bit parallel backplane with 15 cm trace lengths. IC Role / Device Role / Timing Role: Bidirectional bus driver segment using OEA/OEB to control direction and isolation per data nibble group. Use Value: Integrated 25 Ω series termination matches typical FR-4 characteristic impedance (~50–75 Ω), reducing EMI and bit errors at 40 MHz data rates. |
Use Scenario: Replacing obsolete 74F240 in industrial PC motherboard designs maintaining ISA slot compatibility. IC Role / Device Role / Timing Role: Pin- and function-identical upgrade providing lower power and higher noise immunity without layout changes. Use Value: 500 µA max ICC enables >10× reduction in standby power vs. bipolar FAST™; hysteresis improves reliability on noisy ISA control lines (IOR#, IOW#). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74F240PC | Bipolar FAST™ implementation; no integrated termination; 10–15 mA output drive; higher ICC (≈30 mA) | Lacks on-die 25 Ω resistors - requires external termination; unsuitable for high-density routing | Select only if legacy qualification mandates identical bipolar process or if cost sensitivity outweighs noise/space benefits |
| SN74F240N | Same bipolar architecture as 74F240PC; identical pinout and electrical specs; Texas Instruments sourcing | No hysteresis; higher ground bounce; not rated for full –40°C to +85°C industrial range | Preferable only for TI-centric BOMs where second-source assurance is required over performance upgrades |
Compared with 74F240PC and SN74F240N, the PI74FCT240ATS delivers superior signal integrity via monolithic termination, cuts static power by >98%, and extends thermal operating range - making it the optimal choice for new industrial designs prioritizing noise resilience and board area efficiency.
Availability
PI74FCT240ATS is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, backplane interfaces, and legacy bus upgrades requiring stable component supply and long-term industrial availability.
Supply support for PI74FCT240ATS 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 and timing solutions, acquired by Diodes Incorporated in 2016. Its logic portfolio emphasized speed, low power, and system-level integration.
The PI74FCT240ATS belongs to the PI74FCT2XXX family - engineered for 5V TTL-compatible bus interfacing in industrial computing, communications infrastructure, and embedded control systems where noise immunity and layout simplicity are critical.
FAQ
Is PI74FCT240ATS pin-compatible with standard 74F240 devices?
Yes, PI74FCT240ATS maintains identical pinout and logic function with bipolar 74F240 variants (e.g., 74F240PC, SN74F240N), including OEA/OEB enables and inverted output mapping. This allows direct replacement without PCB modification, while delivering improved speed, lower power, and integrated termination.
What is the purpose of the 25 Ω series resistor on each output?
The monolithic 25 Ω series resistor per output is designed to match typical PCB trace impedances when combined with load capacitance and line termination, thereby suppressing signal reflections and reducing EMI. It eliminates the need for eight discrete 25–33 Ω surface-mount resistors, saving board space and assembly cost.
Does PI74FCT240ATS support hot-swap or live-insertion?
No, PI74FCT240ATS does not include hot-swap protection features such as power-up sequencing control, IOFF protection, or bus-hold circuitry. Its absolute maximum ratings specify VCC = GND during insertion, and IOFF is limited to 100 µA - insufficient for safe live insertion into powered backplanes.
Can PI74FCT240ATS drive 50 Ω transmission lines directly?
Yes - with its 25 Ω series output resistor and 64 mA sink capability, PI74FCT240ATS is designed to drive unterminated 50 Ω PCB traces. When paired with a 50 Ω load (e.g., receiver input), the effective source impedance becomes ~75 Ω, providing adequate damping for most 5–10 cm trace lengths at frequencies up to 100 MHz.
PI74FCT240ATS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bag
- 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-SOIC
PI74FCT240ATS FAQ
1.How can I place an order for PI74FCT240ATS through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT240ATS 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 PI74FCT240ATS reliable?
The price and inventory of PI74FCT240ATS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT240ATS is usually 5 days.
3.What payment methods are accepted for PI74FCT240ATS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT240ATS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT240ATS?
PI74FCT240ATS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT240ATS 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 PI74FCT240ATS?
For technical support, including PI74FCT240ATS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT240ATS requirements.
6.How does Aetrix verify that PI74FCT240ATS is sourced from the original manufacturer or authorized distributors?
All PI74FCT240ATS 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 PI74FCT240ATS meets industry standards.
7.What is the process for return or replacement of PI74FCT240ATS?
All PI74FCT240ATS units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT240ATS, 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 PI74FCT240ATS part is unused and in its original packaging.
Return procedure for PI74FCT240ATS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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