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STMicroelectronics 74LVQ244TTR
- Part No.:
- 74LVQ244TTR
- Manufacturer:
- STMicroelectronics
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVQ244TTR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,802
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Product details
Overview
74LVQ244TTR from STMicroelectronics is a low-voltage CMOS octal bus buffer with non-inverting 3-state outputs, designed for 3.3V logic systems. It features 5.6 ns typical propagation delay at VCC = 3.3 V, ±12 mA symmetrical output drive, 2 V to 3.6 V operating voltage range, and 75 Ω transmission line drive capability-used in memory address driving and PCI bus interfacing.
For engineers reviewing the 74LVQ244TTR datasheet, 74LVQ244TTR pinout, 74LVQ244TTR application, or 74LVQ244TTR equivalent, key selection criteria include guaranteed PCI bus levels at 24 mA, balanced tPLH/tPHL delays, ESD immunity up to 2 kV, and TSSOP-20 package compatibility with legacy 74-series footprints.
Technical Context
The device implements eight independent non-inverting buffers, each controlled by one of two group enable inputs (1G and 2G), allowing selective 3-state control of two 4-bit data paths. All inputs and outputs are protected against ESD (2 kV HBM) and transient overvoltage.
It operates across -55°C to +125°C with rail-to-rail input voltage tolerance (0 to VCC), supports 1.2 V data retention, and delivers symmetrical output impedance (|IOH| = IOL ≥ 12 mA at VCC = 3.0 V) for clean signal integrity on 75 Ω transmission lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPD) | 5.6 ns typ. at VCC = 3.3 V - enables high-speed address/data buffering in 3.3V memory subsystems |
| Supply Voltage Range | 2.0 V to 3.6 V - compatible with mixed-voltage 3.3V system rails and low-power operation |
| Output Drive Strength | ±12 mA min. at VCC = 3.0 V - drives 75 Ω transmission lines without external termination |
| Quiescent ICC | 4 µA max. at TA = 25°C - ultra-low static power for battery-backed or always-on logic |
| ESD Immunity | 2 kV HBM - robust handling during PCB assembly and system integration |
| Input/Output Capacitance | CIN = 4 pF, COUT = 8 pF - minimizes loading on upstream drivers and downstream receivers |
| Dynamic Output Noise (VOLP) | 0.4 V typ. at VCC = 3.3 V - reduces ground bounce and crosstalk in dense PCB layouts |
Pinout & Package
TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1G / 2G | Active-low group output enable inputs controlling four buffers each |
| 2,4,6,8 / 11,13,15,17 | 1A1–1A4 / 2A1–2A4 | Non-inverting data inputs for respective output groups |
| 3,5,7,9 / 12,14,16,18 | 1Y1–1Y4 / 2Y1–2Y4 | 3-state non-inverting buffered outputs, high-impedance when G = HIGH |
| 10 | GND | Logic and power ground reference for all I/O and internal circuitry |
| 20 | VCC | Positive supply rail (2.0–3.6 V); decoupling required within 1 cm |
Key Features
| Feature | Design Value |
|---|---|
| PCI Bus Level Compliance | Guaranteed 24 mA drive at VCC = 3.0 V - meets PCI SIG electrical requirements without level-shifting |
| Balanced Propagation Delays | tPLH ≅ tPHL - minimizes skew between rising/falling edges in timing-critical address paths |
| Low Dynamic Noise | VOLP = 0.4 V typ. - suppresses simultaneous switching noise in multi-buffer configurations |
| Pin-Compatible Replacement | Direct drop-in for 74LS244 and 74HC244 in 3.3V designs - no layout change required |
| Extended Temperature Range | -55°C to +125°C operation - qualified for industrial and automotive under-hood applications |
Applications
| Memory Address Buffering | PCI Bus Interface |
|---|---|
Use Scenario: Driving 32-bit address buses from microcontrollers or FPGAs to SRAM/Flash devices in embedded systems. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing level translation, fanout expansion, and bus isolation. Use Value: 5.6 ns tPD and ±12 mA drive ensure setup/hold timing margins are maintained at 50 MHz bus speeds. | Use Scenario: Interfacing 3.3V logic to legacy PCI slots in industrial control backplanes. IC Role / Device Role / Timing Role: Bus transceiver supporting PCI signaling levels and hot-insertion-safe 3-state control. Use Value: Guaranteed 24 mA output current meets PCI specification minimums without external drivers. |
| Low-Power Industrial I/O Expansion | High-Density Logic Isolation |
Use Scenario: Adding isolated GPIO banks to PLC modules where quiescent power must remain below 10 µA per channel. IC Role / Device Role / Timing Role: Low-leakage (±0.1 µA) buffer enabling sleep-mode retention and wake-up signal routing. Use Value: 4 µA max ICC at 25°C allows full 8-channel buffering with negligible impact on system standby current. | Use Scenario: Preventing noise coupling between analog sensor front-ends and digital processing sections on shared PCBs. IC Role / Device Role / Timing Role: High-isolation 3-state gate with 2 kV ESD protection and <0.5 ns output skew. Use Value: 0.4 V VOLP and symmetrical output impedance reduce ground bounce-induced measurement errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Higher ICC (10 µA typ.), 1.65–3.6 V range, 24 mA drive at 3.3 V | Broader VCC range but lower noise immunity (1.5 kV HBM) | Preferred for wider supply tolerance; less suitable for high-noise industrial environments |
| 74ALVC244MTCX | Faster tPD (3.3 ns typ.), higher IOL (24 mA), 1.65–3.6 V, smaller TSSOP-20 footprint | No 2 kV ESD rating; not qualified for extended temperature operation | Optimal for speed-critical consumer designs; avoid in automotive or harsh industrial use |
Compared with SN74LVC244APWR and 74ALVC244MTCX, the 74LVQ244TTR offers superior ESD robustness (2 kV), extended temperature support (-55°C to +125°C), and lower dynamic noise-making it the preferred choice for industrial and automotive bus buffering where reliability outweighs marginal speed gains.
Availability
74LVQ244TTR is available at Aetrix Electronics and suitable for memory address buffering, PCI bus interface, low-power industrial I/O expansion, and high-density logic isolation requiring stable component supply and long-term lifecycle assurance.
Supply support for 74LVQ244TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, and power management applications since 1987.
The 74LVQ series targets low-voltage, low-noise 3.3V logic interfacing-designed specifically for memory subsystems, bus arbitration, and industrial control where ESD resilience and precise timing predictability are critical.
FAQ
What is the maximum output current the 74LVQ244TTR can deliver per pin?
The 74LVQ244TTR guarantees ±12 mA output current per pin at VCC = 3.0 V, with absolute maximum ratings allowing ±50 mA short-duration pulses. At VCC = 3.3 V and 24 mA load, VOH remains ≥2.2 V and VOL ≤0.55 V-meeting PCI bus specifications without external drivers.
Does the 74LVQ244TTR support 5V-tolerant inputs?
No. Inputs are not 5V-tolerant: VIH is specified as 2.0 V minimum at VCC = 3.0–3.6 V, and absolute maximum input voltage is VCC + 0.5 V. Applying 5V signals risks damage or undefined behavior; level-shifting is required for mixed-voltage interfaces.
Can both output-enable inputs (1G and 2G) be tied together?
Yes. 1G and 2G are electrically independent but functionally identical. Tying them simplifies control logic when all eight outputs require synchronized 3-state operation-verified in the truth table and supported by symmetrical enable/disable timing (tPZL = 6.0 ns typ., tPLZ = 6.0 ns typ. at VCC = 3.3 V).
Is the 74LVQ244TTR pin-compatible with standard 74-series 244 devices?
Yes-pin and function compatible with 74LS244 and 74HC244 in TSSOP-20 and SO-20 packages. Signal pin assignments (A/Y/G/VCC/GND) match exactly; however, VCC range (2–3.6 V) and output drive (±12 mA) differ, requiring verification of supply and load conditions in legacy designs.
74LVQ244TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LVQ
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVQ244TTR FAQ
1.How can I place an order for 74LVQ244TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVQ244TTR 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 74LVQ244TTR reliable?
The price and inventory of 74LVQ244TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVQ244TTR is usually 5 days.
3.What payment methods are accepted for 74LVQ244TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVQ244TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVQ244TTR?
74LVQ244TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVQ244TTR 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 74LVQ244TTR?
For technical support, including 74LVQ244TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVQ244TTR requirements.
6.How does Aetrix verify that 74LVQ244TTR is sourced from the original manufacturer or authorized distributors?
All 74LVQ244TTR 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 74LVQ244TTR meets industry standards.
7.What is the process for return or replacement of 74LVQ244TTR?
All 74LVQ244TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVQ244TTR, 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 74LVQ244TTR part is unused and in its original packaging.
Return procedure for 74LVQ244TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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