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Diodes Incorporated PI74FCT244ATS
- Part No.:
- PI74FCT244ATS
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PI74FCT244ATS.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,441
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Product details
Overview
PI74FCT244ATS from Pericom Semiconductor is an octal non-inverting 3-state buffer/line driver with TTL-compatible inputs and outputs, built-in 25 Ω series output resistors, 5 V supply operation, and industrial temperature range (–40°C to +85°C). It functions as a bidirectional bus interface device in high-speed digital systems, enabling clean signal transmission across PCB traces without external termination.
For engineers reviewing the PI74FCT244ATS datasheet, PI74FCT244ATS pinout, PI74FCT244ATS application, or PI74FCT244ATS equivalent, key selection criteria include propagation delay (≤6.5 ns), output drive strength (64 mA sink), input hysteresis (200 mV), and TSSOP-20 package compatibility with dense board layouts.
Technical Context
The PI74FCT244ATS implements dual 4-bit non-inverting buffers with independent active-low 3-state enable controls (OEA and OEB), supporting simultaneous or staggered channel gating. Its CMOS core operates at 5 V with TTL-level input thresholds (VIH = 2.0 V, VIL = 0.8 V) and delivers rail-to-rail output swing (VOH ≥ 2.4 V, VOL ≤ 0.55 V at 64 mA).
All eight outputs integrate 25 Ω series resistors to suppress transmission-line reflections-eliminating need for discrete termination-and feature low ground bounce and input hysteresis for noise immunity in noisy digital environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5.0 V ±5% - ensures compatibility with standard TTL/CMOS logic rails and stable timing margins |
| Propagation Delay | ≤6.5 ns (max, CL = 50 pF) - enables reliable operation up to ~150 MHz system clock domains |
| Output Drive | 64 mA sink / 15 mA source - supports direct driving of multiple TTL loads or unterminated 50 Ω traces |
| Input Hysteresis | 200 mV - rejects noise on address/control lines in electrically noisy industrial backplanes |
| Quiescent Current | ≤500 µA - minimizes standby power in always-on embedded control modules |
| Operating Temp | –40°C to +85°C - certified for deployment in industrial automation and telecom infrastructure |
| Output Resistance | 25 Ω series (integrated) - matches common PCB trace impedance to reduce ringing without layout overhead |
Pinout & Package
PI74FCT244ATS is housed in a 20-pin plastic TSSOP (173 mil width), designated code "L" per Pericom's packaging nomenclature. Pin numbering follows standard dual-inline convention with GND (Pin 10) and VCC (Pin 11) centrally located.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEA | Active-low 3-state enable (Group A) | Controls outputs OA0–OA3; low = enabled, high = high-Z |
| OEB | Active-low 3-state enable (Group B) | Controls outputs OB0–OB3; low = enabled, high = high-Z |
| DA0–DA3 | Group A data inputs | Non-inverting inputs for OA0–OA3 outputs |
| DB0–DB3 | Group B data inputs | Non-inverting inputs for OB0–OB3 outputs |
| OA0–OA3 | Group A buffered outputs | Drive external bus/load with 25 Ω series resistance |
| OB0–OB3 | Group B buffered outputs | Drive external bus/load with 25 Ω series resistance |
| GND | Ground reference | Pin 10 - primary return path for all I/O and supply currents |
| VCC | Power supply | Pin 11 - supplies internal logic and output drivers at 5 V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25 Ω output series resistors | Eliminates need for 8 external termination resistors, reducing BOM count and PCB area in bus interface designs |
| TTL-compatible input thresholds | VIH = 2.0 V / VIL = 0.8 V - ensures interoperability with legacy 5 V microcontrollers, FPGAs, and ASICs |
| Low ground bounce | Minimizes simultaneous switching noise during multi-bit transitions, improving signal integrity on shared ground planes |
| Hysteresis on all inputs | 200 mV threshold margin - prevents chatter on slow-rising control signals (e.g., reset, chip select) in noisy environments |
| Industrial temperature range | –40°C to +85°C operation - qualified for use in motor drives, PLC I/O modules, and outdoor base station equipment |
Applications
| Memory Address Buffering | System Bus Isolation |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or Flash memory in an industrial controller. IC Role / Device Role / Timing Role: Non-inverting buffer with independent group enables (OEA/OEB) isolating memory banks during read/write cycles. Use Value: 6.5 ns max propagation delay ensures setup/hold timing compliance at 20 MHz bus clocks; integrated 25 Ω resistors suppress trace reflections on 4-inch address traces. |
Use Scenario: Isolating CPU data bus from peripheral expansion slots in a modular test instrument. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling hot-swap-safe peripheral insertion via controlled 3-state gating. Use Value: Dual enable pins allow staggered enable/disable sequencing to prevent bus contention; low ground bounce maintains signal fidelity across 8-bit parallel paths. |
| Backplane Signal Conditioning | Legacy Interface Translation |
|
Use Scenario: Re-driving TTL-level control signals across a 12-layer backplane in telecom line card architecture. IC Role / Device Role / Timing Role: High-drive line driver compensating for capacitive loading and interconnect loss on long traces. Use Value: 64 mA sink capability sustains logic LOW under 100 pF load; 25 Ω series termination matches typical FR4 trace impedance (50–75 Ω). |
Use Scenario: Interfacing a modern 5 V FPGA I/O bank to legacy 5 V TTL peripherals (e.g., ADCs, DACs, displays). IC Role / Device Role / Timing Role: Level-shifting and fanout buffer ensuring VIH/VIL compatibility and driving >10 TTL unit loads. Use Value: Guaranteed VOH ≥ 2.4 V and VOL ≤ 0.55 V meet TTL input specs; hysteresis rejects noise on asynchronous control lines like /WR or /RD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT244CTSO | Same pinout and function but rated for commercial temp (0°C to +70°C); no integrated 25 Ω resistors | Not suitable for industrial environments or reflection-sensitive layouts requiring on-die termination | Select only for cost-sensitive, temperature-controlled consumer applications with external termination |
| SN74LVC244APWR | 3.3 V only; LVCMOS levels; no hysteresis; no integrated series resistors; lower drive (24 mA) | Requires level-shifting for 5 V systems; unsuitable for direct replacement in legacy 5 V designs | Use only in new 3.3 V designs where power efficiency and smaller footprint outweigh drive/termination needs |
Compared with 74FCT244CTSO and SN74LVC244APWR, the PI74FCT244ATS uniquely combines industrial temperature rating, integrated 25 Ω termination, and full 5 V TTL compatibility-making it the sole choice for robust, drop-in replacement in legacy 5 V bus architectures.
Availability
PI74FCT244ATS is available at Aetrix Electronics and suitable for industrial control systems, telecom backplane interfaces, memory subsystems, and legacy 5 V embedded designs requiring stable component supply across extended product lifecycles.
Supply support for PI74FCT244ATS 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 (now part of Diodes Incorporated) specialized in high-speed interface and timing solutions, with expertise in CMOS logic, clock distribution, and signal integrity components.
The PI74FCT244ATS belongs to the PI74FCT2XXX family-designed specifically for high-speed, low-noise 5 V bus buffering in industrial and telecom infrastructure where reliability, termination integration, and wide temperature operation are critical.
FAQ
What is the maximum output current rating for PI74FCT244ATS?
The PI74FCT244ATS is rated for 64 mA sink current per output (VOL ≤ 0.55 V) and 15 mA source current (VOH ≥ 2.4 V) under specified conditions (VCC = 4.75 V, TA = –40°C to +85°C). Short-circuit current is limited to –60 mA to –120 mA, and continuous operation above 64 mA per pin is not recommended.
Does PI74FCT244ATS require external pull-up or pull-down resistors on its enable pins?
No. OEA and OEB are TTL-compatible active-low inputs with guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V, and input leakage ≤ ±1 µA. They interface directly to microcontroller GPIOs or FPGA outputs without external biasing-provided the driving source meets TTL voltage thresholds and can sink/source ≥ 20 µA.
Can PI74FCT244ATS be used with 3.3 V logic systems?
No. The PI74FCT244ATS is strictly a 5 V device: VCC must be 4.75–5.25 V, and inputs expect TTL-level thresholds (VIH = 2.0 V min, VIL = 0.8 V max). Driving it from 3.3 V sources risks marginal or non-functional HIGH recognition; likewise, its 5 V outputs may damage 3.3 V–tolerant inputs without level translation.
How does the integrated 25 Ω series resistor affect signal rise/fall times?
The 25 Ω resistor, combined with typical PCB trace capacitance (~2–5 pF/inch), forms a controlled RC network that damps overshoot and reduces ringing-especially on traces >2 inches. Measured rise/fall times remain <3 ns (20–80%), preserving signal integrity without degrading edge speed beyond system timing budgets.
PI74FCT244ATS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-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
PI74FCT244ATS FAQ
1.How can I place an order for PI74FCT244ATS through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT244ATS 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 PI74FCT244ATS reliable?
The price and inventory of PI74FCT244ATS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT244ATS is usually 5 days.
3.What payment methods are accepted for PI74FCT244ATS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT244ATS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT244ATS?
PI74FCT244ATS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT244ATS 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 PI74FCT244ATS?
For technical support, including PI74FCT244ATS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT244ATS requirements.
6.How does Aetrix verify that PI74FCT244ATS is sourced from the original manufacturer or authorized distributors?
All PI74FCT244ATS 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 PI74FCT244ATS meets industry standards.
7.What is the process for return or replacement of PI74FCT244ATS?
All PI74FCT244ATS units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT244ATS, 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 PI74FCT244ATS part is unused and in its original packaging.
Return procedure for PI74FCT244ATS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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