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onsemi 74LVTH244MTCX
- Part No.:
- 74LVTH244MTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVTH244MTCX.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,608
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Product details
Overview
74LVTH244MTCX 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 bushold inputs eliminating external pull-ups, ±32mA/64mA drive capability, and operates from 2.7V to 3.6V over –40°C to +85°C.
For engineers reviewing the 74LVTH244MTCX datasheet, pinout, applications, or equivalent options, this device is selected for high-density bus interface design where live insertion, glitch-free power-up/down behavior, and TTL-level compatibility are required.
Technical Context
The 74LVTH244MTCX implements dual 4-bit non-inverting buffers with independent 3-STATE enable controls (OE1/OE2), supporting bidirectional bus isolation. Its bushold circuitry actively maintains input logic state without external biasing, enabling robust floating-input handling in hot-swap environments.
Constructed using advanced BiCMOS technology, it achieves propagation delays as low as 1.1ns (tPLH/tPHL) at 3.3V while maintaining low ICCZ of 0.19mA in disabled state - balancing speed, power, and noise immunity for high-speed digital backplanes and memory subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V–3.6V - Ensures stable operation across industrial-grade 3.3V supply tolerances. |
| IOH/IOL | –32mA / +64mA - Supports direct drive of multiple TTL loads without buffering. |
| tPLH/tPHL | 1.1ns–3.9ns - Enables sub-4ns signal propagation for >250MHz bus timing margins. |
| VIH/VIL | 2.0V / 0.8V - Guarantees clean TTL-level input recognition at 3.3V VCC. |
| II(HOLD) | ±75µA - Bushold current sufficient to retain logic state against typical PCB leakage. |
| ICCZ | 0.19mA - Ultra-low quiescent current during 3-STATE disable, critical for standby power budgeting. |
| CIN/COUT | 3pF / 6pF - Minimizes capacitive loading on high-speed data and control lines. |
Pinout & Package
74LVTH244MTCX is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide, with 0.65mm lead pitch - optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-Low 3-STATE enable inputs controlling two independent 4-bit output groups. |
| 2–9 | I0–I7 | Data inputs with bushold - retain last valid logic state when unconnected or floating. |
| 11–18 | O0–O7 | Non-inverting buffered outputs capable of sourcing –32mA or sinking +64mA. |
| 10, 20 | GND, VCC | Power supply pins - decoupling required per JEDEC MO-153 layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Bushold inputs | Eliminates need for 10kΩ pull-up resistors on unused I/O, reducing BOM count and board space. |
| Live insertion/extraction support | Enables hot-swap capability in modular backplane systems without bus contention or damage. |
| Power-up/down high-impedance | Prevents output glitches during power sequencing - critical for fault-tolerant system initialization. |
| TTL interface at 3.3V VCC | Allows seamless integration into mixed-voltage systems without level-shifting components. |
| Latch-up immunity >500mA | Ensures robustness against transient voltage events in noisy industrial environments. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
Use Scenario: Driving address lines from a 3.3V microcontroller to multiple 5V SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing voltage-level translation and fanout amplification. Use Value: Eliminates discrete level shifters while maintaining <4ns propagation delay for synchronous access timing. | Use Scenario: Distributing a 50MHz system clock from a PLL to eight 5V logic devices with matched skew. IC Role / Device Role / Timing Role: Low-skew (<1.0ns) clock driver with controlled edge rates and bushold stability. Use Value: Reduces clock jitter accumulation and prevents metastability due to floating enables during power ramp. |
| Hot-Swappable Module Interface | Industrial Bus Transceiver Support |
Use Scenario: Enabling/disabling communication paths between a main controller and field-replaceable I/O modules. IC Role / Device Role / Timing Role: Bidirectional bus isolator with independent OE control per 4-bit group. Use Value: Permits safe module insertion/removal without disrupting active bus traffic on adjacent channels. | Use Scenario: Interfacing a 3.3V FPGA I/O bank to legacy 5V RS-485 or CAN transceiver control lines. IC Role / Device Role / Timing Role: Level-translating buffer with TTL-compatible thresholds and high sink current. Use Value: Provides reliable 5V-compatible control signaling without external resistive dividers or dedicated translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | No bushold; CMOS input thresholds (VIH = 2.0V @ VCC=3.3V); lower drive (–24mA/+24mA). | Suitable only where inputs are always driven; not for floating or hot-swap scenarios. | Select when bushold is unnecessary and lower power consumption is prioritized over drive strength. |
| 74ALVT244MTCX | Higher speed (tPLH = 0.9ns), higher ICCZ (0.5mA), no bushold, 2.5V–3.6V VCC range. | Used in ultra-high-speed backplanes where propagation delay dominates over static power or input robustness. | Choose when sub-1ns timing is mandatory and bushold is not required for system reliability. |
Compared with SN74LVC244APWR and 74ALVT244MTCX, the 74LVTH244MTCX uniquely combines bushold-enabled input resilience, ±32mA/64mA drive, and sub-4ns propagation in a single 3.3V-compatible octal buffer - making it optimal for industrial hot-swap and mixed-voltage bus interfaces where reliability and drive capability are co-prioritized.
Availability
74LVTH244MTCX is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, hot-swappable I/O modules, and industrial bus interface designs requiring stable component supply and long-term manufacturability.
Supply support for 74LVTH244MTCX 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 (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.
The 74LVTH244MTCX belongs to ON Semiconductor's legacy LVT logic family - engineered for high-speed, low-voltage bus interfacing in mixed-signal systems where TTL compatibility, robustness, and board density are essential.
FAQ
What is the function of the bushold feature in the 74LVTH244MTCX?
The bushold feature in the 74LVTH244MTCX actively retains the last valid logic state on each input (I0–I7) when left unconnected or floating, eliminating the need for external pull-up or pull-down resistors. This ensures deterministic behavior during power-up, hot insertion, or signal discontinuity - a key reliability enhancement confirmed in the datasheet's DC Electrical Characteristics table under II(HOLD) and II(OD) parameters.
Does the 74LVTH244MTCX support live insertion and extraction?
Yes, the 74LVTH244MTCX supports live insertion and extraction, as explicitly stated in its Features section. This capability stems from its power-up/down high-impedance behavior and bus-hold inputs, which prevent bus contention and latch-up during hot-swap operations - validated by latch-up performance exceeding 500mA and ESD ratings up to 2000V HBM.
What are the absolute maximum ratings for VCC and VI in the 74LVTH244MTCX?
The 74LVTH244MTCX has an absolute maximum VCC rating of –0.5V to +4.6V and VI rating of –0.5V to +7.0V, allowing safe interfacing with 5V signals while operating from a 3.3V supply. These values are specified in the Absolute Maximum Ratings table and ensure robustness against transient overvoltage conditions without damage.
How does the 74LVTH244MTCX differ from the standard 74LVT244 variant?
The 74LVTH244MTCX differs from the 74LVT244 by including bushold inputs (I0–I7), whereas the 74LVT244 lacks this feature. Both share identical pinout, package, 3-STATE architecture, and electrical specs like drive strength and propagation delay - but only the "H" suffix denotes bushold functionality, as confirmed in the General Description and Features sections of the datasheet.
What is the recommended operating temperature range for the 74LVTH244MTCX?
The 74LVTH244MTCX is rated for a free-air operating temperature range of –40°C to +85°C, as defined in the Recommended Operating Conditions table. This industrial-grade thermal specification ensures reliable operation in demanding environments such as factory automation controllers, telecom line cards, and embedded computing platforms.
74LVTH244MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVTH
- 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
74LVTH244MTCX FAQ
1.How can I place an order for 74LVTH244MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVTH244MTCX 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 74LVTH244MTCX reliable?
The price and inventory of 74LVTH244MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH244MTCX is usually 5 days.
3.What payment methods are accepted for 74LVTH244MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVTH244MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVTH244MTCX?
74LVTH244MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVTH244MTCX 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 74LVTH244MTCX?
For technical support, including 74LVTH244MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH244MTCX requirements.
6.How does Aetrix verify that 74LVTH244MTCX is sourced from the original manufacturer or authorized distributors?
All 74LVTH244MTCX 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 74LVTH244MTCX meets industry standards.
7.What is the process for return or replacement of 74LVTH244MTCX?
All 74LVTH244MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH244MTCX, 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 74LVTH244MTCX part is unused and in its original packaging.
Return procedure for 74LVTH244MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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