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Renesas 74FCT244ATQG8
- Part No.:
- 74FCT244ATQG8
- Manufacturer:
- Renesas
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74FCT244ATQG8.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,187
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Product details
Overview
74FCT244ATQG8 from Renesas Electronics is a FAST CMOS octal buffer/line driver with 3-state outputs, designed for memory and address bus driving, clock distribution, and bidirectional data transmission in industrial systems. It features true TTL input/output compatibility (VOH = 3.3 V typ., VOL = 0.3 V typ.), high drive capability (–15 mA IOH, 64 mA IOL), and operates across –40°C to +85°C.
For engineers reviewing the 74FCT244ATQG8 datasheet, 74FCT244ATQG8 pinout, 74FCT244ATQG8 application, or 74FCT244ATQG8 equivalent, key selection criteria include its dual enable control (OEA/OEB), low leakage (≤1 µA max), JEDEC 18 compliance, and TSSOP-20 package suitability for high-density PCB layouts.
Technical Context
The 74FCT244ATQG8 implements two independent 4-bit non-inverting buffers, each controlled by a dedicated active-low 3-state enable (OEA, OEB). Its dual-metal CMOS process ensures TTL-compatible thresholds while delivering CMOS power efficiency.
It supports live insertion via power-off disable outputs and meets MIL-STD-883 Class B for military-grade reliability when configured per DESC dual-marking. Propagation delays are guaranteed ≤4.1 ns (tPLH/tPHL) and output enable/disable times ≤5.8 ns (tPZH/tPLZ) under industrial conditions (VCC = 5.0 V ±5%, CL = 50 pF, RL = 500 Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0 V ±5% - fixed single-rail operation; no internal regulation or wide-VCC support |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without derating |
| IOH / IOL | –15 mA / +64 mA - drives heavy capacitive loads or multiple TTL inputs directly |
| tPLH / tPHL | ≤4.1 ns - enables sub-250 MHz bus timing margins in synchronous systems |
| CIN / COUT | 6–10 pF / 8–12 pF - low input/output capacitance minimizes signal distortion on stubbed traces |
| VIH / VIL | 2.0 V min / 0.8 V max - robust TTL-level recognition even with noise or voltage droop |
| ICC Quiescent | ≤1 mA - reduces static power in always-on bus interface circuits |
Pinout & Package
74FCT244ATQG8 is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 6.5 mm body, 0.65 mm pitch, lead-free (RoHS-compliant) and green-process certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA, OEB | Active-low 3-state enable controls left/right 4-bit sections independently |
| 2–5, 13–16 | Dxx, Oxx | Input/output pairs (DA0–DA3, OA0–OA3, DB0–DB3, OB0–OB3); non-inverting path |
| 10 | GND | Ground reference for all logic and output stages; requires low-impedance plane |
| 20 | VCC | Primary 5 V supply; decoupling capacitor (0.1 µF) required within 5 mm |
Key Features
| Feature | Design Value |
|---|---|
| True TTL I/O compatibility | Guaranteed VIH ≥ 2.0 V and VOL ≤ 0.55 V at 64 mA drive - interoperates with legacy 74LS/ALS without level shifters |
| High sink/source drive | 64 mA IOL supports fan-out to 20+ standard TTL loads - eliminates need for external drivers on address/data buses |
| Live-insertion support | Outputs enter high-Z when VCC = 0 V - prevents back-driving during hot-swap or partial-power-up sequences |
| Low input leakage | ≤1 µA max IIH/IIL - preserves signal integrity on long, unterminated traces and reduces standby current in battery-backed systems |
Applications
| Memory Address Buffering | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer with independent section enables - isolates controller from bus loading and allows dynamic segment selection. Use Value: 4.1 ns propagation delay and 64 mA drive ensure setup/hold timing closure across 15 cm routed traces at 20 MHz bus rates. | Use Scenario: Interfacing a CPU module to distributed I/O cards over a ruggedized parallel backplane in factory automation. IC Role / Device Role / Timing Role: Bidirectional line driver/receiver with 3-state control - manages direction and contention on shared data lanes. Use Value: Dual enable (OEA/OEB) permits interleaved read/write cycles without bus turnaround delay or external direction logic. |
| Legacy Bus Signal Conditioning | Test Equipment Digital Pattern Generator |
Use Scenario: Level-shifting and strengthening signals between modern FPGA I/O banks and older ISA or VME bus peripherals. IC Role / Device Role / Timing Role: TTL-compatible buffer with CMOS quiescent power - bridges voltage and drive-gap mismatches. Use Value: ≤1 µA input leakage and 2.0 V VIH guarantee reliable detection of marginal TTL HIGHs in noisy plant-floor environments. | Use Scenario: Generating synchronized 8-bit stimulus patterns for DUT testing in automated test equipment (ATE). IC Role / Device Role / Timing Role: Precision-timed non-inverting driver with sub-5 ns skew - delivers deterministic edge alignment across all eight outputs. Use Value: Matched tPLH/tPHL (≤4.1 ns) and low COUT (≤12 pF) minimize inter-channel skew and maintain <100 ps pulse fidelity at 100 MHz toggle rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT244ATPWR | Same logic function, identical AC/DC specs, but TI's version uses PW (TSSOP-20) package with slightly different thermal pad layout | Compatible in most PCB footprints; requires verification of solder mask opening and thermal relief for GND pad | Select when sourcing flexibility or TI-aligned BOM consolidation is prioritized |
| 74LCX244MTCX | Lower VCC range (2.0–3.6 V), higher speed (tPD ≤ 3.5 ns), but not TTL-input compatible - requires level translation if driven by 5 V sources | Not drop-in for 5 V TTL systems; suitable only in mixed-voltage 3.3 V domains with clean input signaling | Choose only when migrating to 3.3 V logic and full TTL compatibility is unnecessary |
Compared with SN74FCT244ATPWR and 74LCX244MTCX, the 74FCT244ATQG8 uniquely balances 5 V TTL interoperability, industrial temperature rating, and proven field reliability in legacy infrastructure upgrades - making it the preferred choice where backward compatibility and long-term supply stability are critical.
Availability
74FCT244ATQG8 is available at Aetrix Electronics and suitable for industrial control systems, programmable logic controller (PLC) backplanes, and legacy bus interface modules requiring stable component supply and long-lifecycle support.
Supply support for 74FCT244ATQG8 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
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT markets.
The IDT FCT family - including the 74FCT244ATQG8 - was developed to deliver TTL-compatible, low-power, high-speed buffering for industrial and military-grade board-level interconnect, emphasizing signal integrity, bus loading reduction, and long-term manufacturability.
FAQ
What is the operating voltage range for the 74FCT244ATQG8?
The 74FCT244ATQG8 operates at a nominal VCC of 5.0 V with a tolerance of ±5%, specified for industrial temperature range (–40°C to +85°C). It does not support wide-input voltage operation or dual-supply configurations. The absolute maximum VCC is 5.5 V, and operation outside 4.75–5.25 V may violate timing or DC specifications. All performance parameters - including VOH, VOL, and propagation delay - are characterized and guaranteed only within this 5.0 V ±5% window.
Does the 74FCT244ATQG8 support live insertion, and how is it implemented?
Yes, the 74FCT244ATQG8 supports live insertion through its power-off disable feature: when VCC = 0 V, all outputs automatically enter high-impedance state regardless of input or enable pin states. This behavior is inherent to its internal circuit design and requires no external pull-ups or sequencing controls. The feature prevents back-driving of powered subsystems during hot-swap events - a key requirement in modular industrial controllers and repairable backplane architectures using the 74FCT244ATQG8.
What is the pin configuration of the 74FCT244ATQG8, and how are the enable controls arranged?
The 74FCT244ATQG8 uses a 20-pin TSSOP package with two independent 4-bit sections. Pins 1 and 19 serve as active-low 3-state enables OEA and OEB, controlling outputs OA0–OA3 and OB0–OB3 respectively. Inputs DA0–DA3 occupy pins 2–5; outputs OA0–OA3 are on pins 13–16. Inputs DB0–DB3 are on pins 12, 11, 10 (GND), and 9; outputs OB0–OB3 are on pins 7, 6, 18, and 17. Pin 20 is VCC. This arrangement enables asymmetric bus control - for example, enabling only one section during read vs. write cycles in the 74FCT244ATQG8.
How does the 74FCT244ATQG8 differ from the 74FCT244T and 74FCT244CT variants?
The 74FCT244ATQG8 belongs to the "AT" speed grade, offering faster timing than the base "T" version (e.g., tPLH ≤4.1 ns vs. ≤4.8 ns) and tighter enable/disable times than "CT" (tPZH ≤5.8 ns vs. ≤6.5 ns). All three share identical pinout, DC specs, and functionality. The "AT" grade targets higher-speed industrial designs where marginal timing budgets demand guaranteed sub-4.5 ns propagation - a distinction confirmed in the official Renesas switching characteristics table for the 74FCT244ATQG8.
Is the 74FCT244ATQG8 RoHS compliant and lead-free?
Yes, the 74FCT244ATQG8 is RoHS compliant and manufactured using Renesas' green process, as indicated by the "G" suffix in the part number and confirmed in the ordering information section of the datasheet. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. The TSSOP-20 package uses matte tin (Sn) lead finish, compatible with standard Pb-free reflow profiles (J-STD-020D), and is suitable for use in environmentally regulated industrial and medical equipment incorporating the 74FCT244ATQG8.
74FCT244ATQG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-QSOP
74FCT244ATQG8 FAQ
1.How can I place an order for 74FCT244ATQG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT244ATQG8 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 74FCT244ATQG8 reliable?
The price and inventory of 74FCT244ATQG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT244ATQG8 is usually 5 days.
3.What payment methods are accepted for 74FCT244ATQG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT244ATQG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT244ATQG8?
74FCT244ATQG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT244ATQG8 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 74FCT244ATQG8?
For technical support, including 74FCT244ATQG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT244ATQG8 requirements.
6.How does Aetrix verify that 74FCT244ATQG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT244ATQG8 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 74FCT244ATQG8 meets industry standards.
7.What is the process for return or replacement of 74FCT244ATQG8?
All 74FCT244ATQG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT244ATQG8, 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 74FCT244ATQG8 part is unused and in its original packaging.
Return procedure for 74FCT244ATQG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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