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onsemi 74LVT244MTCX
- Part No.:
- 74LVT244MTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVT244MTCX.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:21,426
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Product details
Overview
74LVT244MTCX from ON Semiconductor is a low-voltage octal buffer/line driver with 3-STATE outputs, designed for memory address and clock driving in 3.3V systems interfacing to 5V TTL buses. It features 20-pin TSSOP packaging, ±32mA/64mA output drive capability, and operates across –40°C to +85°C.
For engineers reviewing the 74LVT244MTCX datasheet, pinout, applications, or equivalent options, this device serves as a functionally compatible upgrade to 74-series 244 logic with improved PC board density, live insertion support, and power-up/down high-impedance behavior to prevent bus glitches.
Technical Context
The 74LVT244MTCX implements dual 4-bit non-inverting buffers with independent 3-STATE enable controls (OE1, OE2), each gating four outputs (O0–O3 and O4–O7). Its BiCMOS process enables 3.3V operation while maintaining TTL-level input compatibility up to 5.5V.
It provides rail-to-rail output swing under load (VOL ≤ 0.55V at IOL = 64mA, VOH ≥ 2.0V at IOH = –32mA) and exhibits low dynamic noise (VOLP ≤ 0.8V, VOLV ≥ –0.8V) with propagation delays as low as 1.1ns (tPLH, tPHL at VCC = 3.3V, CL = 50pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 3.6V - Ensures stable operation in standard 3.3V logic domains without overvoltage risk. |
| Output Drive | –32mA / +64mA - Supports heavy capacitive loads and fan-out to multiple TTL inputs without external buffering. |
| Propagation Delay | 1.1ns to 4.2ns - Enables high-speed data routing in memory and clock distribution paths. |
| Input Voltage Range | 0V to 5.5V - Allows direct connection to 5V legacy systems without level-shifting circuitry. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and computing applications. |
| 3-STATE Enable Skew | tPZH/tPZL ≤ 5.3ns - Minimizes bus contention during output enable/disable transitions. |
| Power Supply Current | ICCL = 5mA (all outputs LOW) - Predictable current draw aids thermal and power budgeting. |
Pinout & Package
74LVT244MTCX uses a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide, with 0.65mm lead pitch and exposed pad not present. Pin 1 is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-STATE enable inputs - Independently disable first and second group of four outputs. |
| 2–5, 11–14 | I0–I3, I4–I7 | Data inputs - Accept 3.3V CMOS or 5V TTL logic levels; no bushold (unlike LVTH variant). |
| 3, 5, 7, 9, 12, 14, 16, 18 | O0–O7 | Non-inverting buffered outputs - Drive bidirectional buses with controlled impedance and low ground bounce. |
| 10, 20 | GND, VCC | Power terminals - Dual ground and supply pins reduce switching noise and improve decoupling effectiveness. |
Key Features
| Feature | Design Value |
|---|---|
| Live insertion/extraction support | Enables hot-swap capability in backplane and modular systems without damaging the device or host board. |
| Power-up/down high-impedance | Prevents bus contention during power sequencing - outputs remain in 3-STATE until VCC stabilizes. |
| TTL interface at 3.3V VCC | Eliminates need for external level translators when interfacing with legacy 5V peripherals or controllers. |
| Latch-up immunity > 500mA | Ensures robustness against transient voltage events and ESD-induced latch-up in noisy industrial environments. |
| ESD protection > 2000V HBM | Reduces handling sensitivity and improves yield in automated assembly and field-replaceable module workflows. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
|
Use Scenario: Driving address lines from a 3.3V microcontroller to multiple 5V SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer isolating and strengthening address signals with precise timing control. Use Value: Prevents signal degradation over long traces and ensures setup/hold compliance at 5V receivers despite 3.3V source. |
Use Scenario: Distributing a system clock from a 3.3V oscillator to multiple 5V peripheral ICs requiring synchronized timing. IC Role / Device Role / Timing Role: Low-skew line driver delivering clean, high-drive clock edges with minimal jitter addition. Use Value: Maintains clock integrity across mixed-voltage domains without added delay variation or duty-cycle distortion. |
| Bus Transceiver Interface | Legacy System Expansion |
|
Use Scenario: Bidirectional data bus isolation between a 3.3V FPGA and 5V ISA-style peripheral cards. IC Role / Device Role / Timing Role: Direction-controlled buffer enabling safe read/write handshaking across voltage domains. Use Value: Eliminates level-shifter complexity while supporting real-time bus arbitration and glitch-free direction switching. |
Use Scenario: Upgrading aging industrial controllers by replacing obsolete 74F244 with pin-compatible 3.3V logic. IC Role / Device Role / Timing Role: Drop-in functional replacement preserving PCB layout and firmware timing margins. Use Value: Reduces power consumption and heat generation versus 5V families while retaining full 74-series behavioral compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVTH244MTCX | Includes bushold inputs - eliminates need for external pull-ups on unused inputs. | Better suited for systems with floating or intermittently driven inputs; higher input leakage current. | Select when input stability without external components is critical; otherwise 74LVT244MTCX offers lower static current. |
| SN74LVC244APWR | CMOS-based, lower ICC (1.5µA typical), but reduced drive (–24mA/+24mA) and narrower VIH/VIL thresholds. | Optimized for ultra-low-power battery-operated designs; less tolerant of 5V-tied inputs without clamping. | Choose for new low-power designs where 5V interface is not required; 74LVT244MTCX remains preferred for mixed-voltage robustness. |
Compared with 74LVTH244MTCX, the 74LVT244MTCX avoids bushold-related input leakage and simplifies biasing; versus SN74LVC244APWR, it delivers higher drive strength and wider input voltage tolerance essential for legacy 5V interoperability.
Availability
74LVT244MTCX is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial bus interfaces, and legacy system upgrades requiring stable component supply and long-term sourcing continuity.
Supply support for 74LVT244MTCX 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and discrete solutions for automotive, industrial, cloud, and consumer markets.
The 74LVT244MTCX belongs to ON Semiconductor's legacy logic portfolio inherited from Fairchild, engineered for high-density, mixed-voltage digital interfacing in industrial and computing infrastructure.
FAQ
Is 74LVT244MTCX still in active production?
No - the 74LVT244MTCX is discontinued and not recommended for new designs per ON Semiconductor documentation. However, Aetrix Electronics maintains limited legacy inventory and supports obsolescence management, including cross-reference guidance and last-time-buy coordination for ongoing production programs.
What is the key difference between 74LVT244MTCX and 74LVTH244MTCX?
The 74LVTH244MTCX includes bushold circuitry on all data inputs, holding unused inputs at their last valid logic state without external pull-up resistors. The 74LVT244MTCX lacks bushold, requiring external termination if inputs float - making it simpler for controlled-bias designs but less forgiving in undefined states.
Can 74LVT244MTCX safely interface with 5V logic inputs?
Yes - the 74LVT244MTCX accepts input voltages up to 5.5V while operating at 3.3V VCC, enabling direct connection to 5V TTL outputs without level shifters. Its VIH (≥2.0V) and VIL (≤0.8V) thresholds ensure reliable recognition of 5V logic levels.
Does 74LVT244MTCX support hot-plug operation?
Yes - the 74LVT244MTCX is explicitly rated for live insertion/extraction. Its power-up/down high-impedance feature ensures outputs remain in 3-STATE during power transients, preventing bus conflicts or damage when inserted into an energized system backplane or carrier board.
What package type does 74LVT244MTCX use, and is it RoHS-compliant?
The 74LVT244MTCX uses a 20-lead TSSOP (Thin Shrink Small Outline Package), JEDEC MO-153, 4.4mm wide. All variants are lead-free and comply with JEDEC J-STD-020B reflow standards, meeting RoHS Directive 2011/65/EU requirements.
74LVT244MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVT244MTCX FAQ
1.How can I place an order for 74LVT244MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT244MTCX 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 74LVT244MTCX reliable?
The price and inventory of 74LVT244MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT244MTCX is usually 5 days.
3.What payment methods are accepted for 74LVT244MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT244MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT244MTCX?
74LVT244MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT244MTCX 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 74LVT244MTCX?
For technical support, including 74LVT244MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT244MTCX requirements.
6.How does Aetrix verify that 74LVT244MTCX is sourced from the original manufacturer or authorized distributors?
All 74LVT244MTCX 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 74LVT244MTCX meets industry standards.
7.What is the process for return or replacement of 74LVT244MTCX?
All 74LVT244MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT244MTCX, 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 74LVT244MTCX part is unused and in its original packaging.
Return procedure for 74LVT244MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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