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STMicroelectronics 74LVX244TTR
- Part No.:
- 74LVX244TTR
- Manufacturer:
- STMicroelectronics
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVX244TTR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,588
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Product details
Overview
74LVX244TTR from STMicroelectronics is a low-voltage CMOS octal non-inverting bus buffer with 3-state outputs, designed for voltage-level translation between 5V and 3.3V systems. It features 4.5ns typical propagation delay at VCC = 3.3V, 5V-tolerant inputs, ±4mA symmetrical output drive, 2V–3.6V operating range, and power-down input protection-enabling use in battery-powered industrial I/O expansion.
For engineers reviewing the 74LVX244TTR datasheet, 74LVX244TTR pinout, 74LVX244TTR application, or 74LVX244TTR equivalent, key selection criteria include 3.3V-compatible 3-state control timing, input overvoltage tolerance up to 7V, quiescent current ≤4µA, symmetrical output impedance, and TSSOP-20 package compatibility with space-constrained PCB layouts.
Technical Context
The device implements dual 4-bit non-inverting buffers, each controlled by independent 3-state enable inputs (1G and 2G). All eight outputs enter high-impedance state when their respective G input is HIGH, supporting bidirectional bus arbitration in multiplexed data paths.
Input protection circuitry accepts 0–7V regardless of VCC, enabling safe interfacing with legacy 5V logic while powered from 3.3V. Propagation delays tPLH and tPHL are balanced (tPLH ≅ tPHL), minimizing skew-sensitive timing errors in synchronous data transfers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.5ns typ. at VCC=3.3V, CL=15pF - enables sub-10ns timing margins in 3.3V backplane or memory interface buffering |
| Supply Voltage Range | 2.0V to 3.6V - supports Li-ion battery operation down to 2.0V without functional loss |
| Input Voltage Tolerance | 0V to 7V - allows direct connection to 5V logic without level-shifting components |
| Output Drive Strength | ±4mA min. at VCC=3V - sufficient to drive 50pF loads across 10cm traces on FR-4 |
| Quiescent Current | 4µA max. at TA=25°C - reduces standby power in always-on sensor nodes |
| ESD Immunity | 2kV HBM - meets IEC 61000-4-2 Level 2 for board-level robustness |
| Operating Temperature | −55°C to +125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
TSSOP-20 package: 6.5mm × 4.4mm body, 0.65mm pitch, 1.05mm max height, gull-wing leads, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1G, 2G - Output Enable Inputs | Active-LOW enables corresponding 4-bit buffer group; HIGH forces outputs into high-impedance state |
| 2,4,6,8 | 1A1–1A4 - Input Group 1 | Non-inverting data inputs for first quad buffer; tolerate 0–7V independent of VCC |
| 3,5,7,9 | 1Y1–1Y4 - Output Group 1 | 3-state buffered outputs mirroring 1A1–1A4; driven LOW/HIGH or tri-stated per 1G |
| 11,13,15,17 | 2A1–2A4 - Input Group 2 | Non-inverting data inputs for second quad buffer; identical electrical behavior to 1A1–1A4 |
| 12,14,16,18 | 2Y1–2Y4 - Output Group 2 | 3-state buffered outputs mirroring 2A1–2A4; controlled independently by 2G |
| 10 | GND | Reference ground for all I/O and internal logic; must be connected before VCC during power-up |
| 20 | VCC | Positive supply for core logic and output drivers; decoupling capacitor required within 1cm |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant inputs | Accepts 0–7V signals with no external clamping diodes or resistors, simplifying mixed-voltage system design |
| Power-down input protection | Inputs remain protected and non-latching even when VCC = 0V, preventing back-powering of supply rails |
| Balanced propagation delays | tPLH ≅ tPHL ensures minimal duty-cycle distortion in clock or strobe distribution applications |
| Low dynamic noise | VOLP = 0.5V typ. at VCC = 3.3V reduces simultaneous switching noise in dense digital layouts |
| Symmetrical output drive | |IOH| = |IOL| ≥ 4mA minimizes rise/fall time mismatch in push-pull bus termination schemes |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from noisy 24V field sensors and actuators via optocoupler interfaces. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer translating 3.3V MCU logic to 5V-compatible opto-driver inputs while suppressing ground bounce. Use Value: Enables direct connection to legacy 5V sensor modules without level shifters, reducing BOM count and layout area. |
Use Scenario: Driving multiple LED indicators and relay coils from a single 3.3V automotive MCU with shared power domains. IC Role / Device Role / Timing Role: Octal buffer providing isolated, slew-controlled outputs to prevent EMI during simultaneous LED turn-on events. Use Value: Delivers ±4mA per channel with <0.5V quiet-output noise, meeting CISPR 25 Class 3 EMC requirements. |
| Portable Medical Instrument Data Bus | Test Equipment Signal Conditioning |
|
Use Scenario: Buffering ADC sample clocks and SPI command lines between ultra-low-power 3.3V SoC and higher-voltage analog front-end ICs. IC Role / Device Role / Timing Role: Low-skew, low-noise repeater ensuring signal integrity across split-power-domain PCB sections. Use Value: 4.5ns propagation delay and <1.5ns output-to-output skew preserve timing margins in 25MHz SPI interfaces. |
Use Scenario: Interfacing FPGA-based pattern generators with DUTs requiring 5V TTL/CMOS input thresholds. IC Role / Device Role / Timing Role: Voltage-translating buffer converting 3.3V FPGA outputs to 5V-compatible logic levels with precise VIH/VIL thresholds. Use Value: Guaranteed VIH = 2.0V and VIL = 0.8V at VCC = 3.0V ensure reliable recognition of FPGA logic states by legacy test fixtures. |
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 | Wider VCC range (1.65–3.6V); lower ICC (1µA typ.); no 7V input tolerance | Requires external clamping for >3.6V inputs; better suited for pure 3.3V-only systems | Select when lowest static power is critical and all upstream signals stay ≤3.6V |
| 74ALVC244MTCX | Faster tPD = 2.8ns (typ.); higher IOL = 24mA; 3.6V max VCC; no 5V-tolerant inputs | Cannot interface 5V logic directly; requires level-shifter for mixed-voltage designs | Select when speed >4ns is mandatory and full 5V tolerance is unnecessary |
Compared with SN74LVC244APWR and 74ALVC244MTCX, the 74LVX244TTR uniquely combines 7V input tolerance, 4.5ns speed, and sub-5µA quiescent current-making it optimal for cost-sensitive, mixed-voltage industrial interfaces where reliability trumps raw speed.
Availability
74LVX244TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, portable medical instrument data buses, and test equipment signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LVX244TTR 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, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities.
The LVX logic family targets low-voltage, low-power, mixed-signal interfacing applications-designed specifically for seamless integration between legacy 5V systems and modern 3.3V microcontrollers and FPGAs.
FAQ
Can 74LVX244TTR operate with VCC = 2.0V and still meet VIH/VIL specifications?
Yes. Per Recommended Operating Conditions, VIH is guaranteed ≥1.5V and VIL ≤0.5V across the full 2.0–3.6V VCC range. At VCC = 2.0V, the device maintains valid logic thresholds for 3.3V-compatible peripherals, though propagation delay increases to 13.5ns max (CL = 15pF).
Is output disable time (tPHZ) faster than enable time (tPZH) for this device?
Yes. At VCC = 3.3V and CL = 50pF, tPHZ (disable) is 9.7–11.4ns (typ–max), while tPZH (enable) is 5.5–12.0ns. The asymmetry arises from internal driver staging-disable path bypasses output stage precharge, yielding marginally faster transition to high-Z.
Does the 2kV ESD rating apply to all pins including VCC and GND?
Yes. The 2kV HBM rating applies to all I/O pins (A, Y, G) and power pins (VCC, GND) per JEDEC JESD22-A114. This includes protection against charge injection during board handling and connector mating, verified across full temperature range.
What is the maximum capacitive load this device can drive while maintaining 4.5ns propagation delay?
The 4.5ns typical propagation delay is specified at CL = 15pF. At CL = 50pF, tPLH/tPHL increases to 7.2–10.6ns. For designs requiring ≤5ns delay, total load-including trace capacitance, probe effects, and input capacitance of downstream devices-must be held ≤15pF.
74LVX244TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LVX
- 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:
- 4mA, 4mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVX244TTR FAQ
1.How can I place an order for 74LVX244TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVX244TTR 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 74LVX244TTR reliable?
The price and inventory of 74LVX244TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVX244TTR is usually 5 days.
3.What payment methods are accepted for 74LVX244TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVX244TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVX244TTR?
74LVX244TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVX244TTR 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 74LVX244TTR?
For technical support, including 74LVX244TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVX244TTR requirements.
6.How does Aetrix verify that 74LVX244TTR is sourced from the original manufacturer or authorized distributors?
All 74LVX244TTR 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 74LVX244TTR meets industry standards.
7.What is the process for return or replacement of 74LVX244TTR?
All 74LVX244TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVX244TTR, 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 74LVX244TTR part is unused and in its original packaging.
Return procedure for 74LVX244TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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