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onsemi 74LVTH2244MTCX
- Part No.:
- 74LVTH2244MTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVTH2244MTCX.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
74LVTH2244MTCX from Fairchild Semiconductor is a low-voltage octal buffer/line driver with 3-STATE outputs and integrated 25Ω series output resistors, designed for memory address and clock distribution in 3.3V systems interfacing to 5V TTL buses. It features bushold inputs (eliminating external pull-ups), ±12mA drive capability, and operates from 2.7V to 3.6V over –40°C to +85°C.
For engineers reviewing the 74LVTH2244MTCX datasheet, pinout, applications, or equivalent options, this device is selected for high-density bus driving where signal integrity, live insertion, and power-up/down high-impedance behavior are critical - especially in legacy-compatible embedded control and memory subsystems.
Technical Context
The 74LVTH2244MTCX 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 bushold circuitry actively maintains input logic state without external biasing, supporting unused input termination.
Each output integrates a 25Ω series resistor to dampen transmission-line reflections, reducing overshoot/undershoot on PCB traces. The BiCMOS process enables ABT-class speed (tPLH/tPHL ≤ 4.4 ns at 3.3V) while maintaining LVT-level power efficiency (ICCL = 5 mA max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Ensures compatibility with 3.3V supply rails while tolerating manufacturing variation and droop. |
| IOH/IOL | –12mA / +12mA - Sustains robust drive into 50Ω loads or multiple TTL inputs without external buffering. |
| tPLH/tPHL | ≤4.4ns / ≤4.1ns (CL = 50pF) - Enables reliable operation in high-speed address/data bus timing windows up to ~200 MHz. |
| Output Series R | 25Ω - Integrated resistor minimizes PCB trace ringing and EMI without requiring discrete series termination. |
| Bushold Current | ±75µA at VI = 0.8V/2.0V - Actively holds floating inputs at valid logic levels, removing need for pull-up resistors. |
| Power-Up High-Z | Guaranteed - Prevents bus contention during power sequencing, eliminating glitch-induced system resets. |
| ESD Rating | HBM > 2000V - Supports safe handling and board-level reliability in industrial assembly environments. |
Pinout & Package
74LVTH2244MTCX is housed in 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 notch or dot; package meets JEDEC J-STD-020B for lead-free soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 11, 13, 15, 17, 19 | Data Inputs I0–I7 and Output Enables OE1/OE2 | I0–I7 accept buffered signals; OE1/OE2 independently disable top/bottom 4-output groups. |
| 3, 5, 7, 9, 12, 14, 16, 18 | Outputs O0–O7 | 3-STATE outputs with built-in 25Ω series resistance; driven HIGH/LOW or placed in high-impedance mode. |
| 10, 20 | VCC and GND | Single power rail (3.3V) and ground; decoupling required near pin 10 for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Bushold Inputs | Eliminates external pull-up resistors on unused data or enable inputs, reducing BOM count and PCB area. |
| Integrated 25Ω Output Resistors | Reduces signal edge ringing and EMI without discrete termination components or layout tuning. |
| Live Insertion/Extraction Support | Enables hot-swap capability in backplane or modular systems without damaging the device or bus. |
| Power-Up/Down High-Impedance | Prevents bus contention during power ramp-up/down, ensuring glitch-free initialization of memory or peripheral interfaces. |
| TTL-Compatible Input Thresholds | VIH = 2.0V min, VIL = 0.8V max at VCC = 3.3V - Allows direct connection to 5V TTL outputs without level shifters. |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
|
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 providing fan-out and signal integrity enhancement with controlled edge rates. Use Value: Integrated 25Ω resistors suppress overshoot on long traces; bushold prevents floating address bits during reset. |
Use Scenario: Distributing a system clock to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs) with matched skew. IC Role / Device Role / Timing Role: Low-skew (≤1.0ns) line driver delivering clean, terminated clock edges across parallel loads. Use Value: tOSHL/tOSLH ≤ 1.0ns ensures simultaneous clock arrival; 3-STATE enables dynamic clock gating per subsystem. |
| Legacy Bus Interface Adapter | Industrial Control Backplane Driver |
|
Use Scenario: Interfacing a 3.3V FPGA I/O bank to an existing 5V TTL data bus in upgrade scenarios. IC Role / Device Role / Timing Role: Voltage-tolerant buffer translating logic levels while maintaining timing compliance. Use Value: VI = 0–5.5V input range and 5V-tolerant outputs allow seamless integration without level-shifting ICs. |
Use Scenario: Driving control signals (e.g., chip selects, strobes) across a 200mm backplane in PLC or motion controller modules. IC Role / Device Role / Timing Role: Robust line driver with ±12mA drive and live-insertion support for field-replaceable cards. Use Value: Latch-up immunity >500mA and HBM ESD >2000V ensure reliability in electrically noisy industrial environments. |
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; no integrated 25Ω resistors; lower drive (±24mA); 1.65–3.6V VCC range. | Lacks inherent input hold and output damping - requires external termination and pull-ups for same use cases. | Select when cost sensitivity outweighs signal integrity requirements and board space allows discrete components. |
| 74ALVCH244MTCX | Bushold enabled; no integrated series resistors; higher speed (tPD ≤ 3.2ns); 1.65–3.6V VCC. | Superior propagation delay but no built-in damping - may require external 25–33Ω series resistors for clean edges. | Choose for maximum speed in compact layouts where external termination is acceptable and bushold is needed. |
Compared with SN74LVC244APWR and 74ALVCH244MTCX, the 74LVTH2244MTCX uniquely combines bushold, integrated 25Ω termination, and 5V-tolerant inputs - making it optimal for drop-in replacement in legacy 5V-interfaced 3.3V systems where signal integrity and BOM simplification are prioritized over raw speed or ultra-low voltage operation.
Availability
74LVTH2244MTCX is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial backplanes, and legacy bus interface adapters requiring stable component supply and long-term obsolescence management.
Supply support for 74LVTH2244MTCX 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, power management, and interface solutions before its acquisition by ON Semiconductor in 2016.
The 74LVTH2244MTCX belongs to Fairchild's LVT/H family of low-voltage TTL-compatible buffers, engineered for high-density, noise-immune bus driving in mixed-voltage embedded and industrial systems.
FAQ
What is the function of bushold in the 74LVTH2244MTCX?
The bushold circuitry in the 74LVTH2244MTCX actively maintains the logic state of unused inputs (I0–I7, OE1, OE2) without external pull-up or pull-down resistors. It sources or sinks ±75µA to hold the input at a valid HIGH or LOW level, reducing component count and improving board density. This feature is exclusive to the LVTH variant and is confirmed in the DC Electrical Characteristics table under II(HOLD) and II(OD) parameters.
Does the 74LVTH2244MTCX support 5V input signals?
Yes, the 74LVTH2244MTCX supports 5V-tolerant inputs: VI is rated from 0V to 5.5V per the Recommended Operating Conditions table. This allows direct connection to 5V TTL outputs while operating from a 3.3V supply, enabling seamless interfacing between legacy and modern logic families without level shifters.
What is the purpose of the 25Ω series resistors on the outputs of the 74LVTH2244MTCX?
The 25Ω series resistors integrated into each output (O0–O7) of the 74LVTH2244MTCX serve to dampen fast signal edges and suppress transmission-line reflections on PCB traces. As stated in the General Description, this reduces output overshoot and undershoot, improving signal integrity without requiring discrete series termination components.
Can the 74LVTH2244MTCX be used in hot-swap applications?
Yes, the 74LVTH2244MTCX supports live insertion and extraction, as explicitly noted in the Features section. Its power-up/down high-impedance behavior prevents bus contention during power sequencing, and its latch-up performance (>500mA) and ESD robustness (HBM > 2000V) make it suitable for modular backplane systems requiring field-replaceable modules.
What package type does the 74LVTH2244MTCX use, and is it RoHS-compliant?
The 74LVTH2244MTCX uses a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide. Per the Ordering Information section, all packages-including MTC20-are lead-free and comply with JEDEC J-STD-020B, satisfying RoHS requirements for Pb-free soldering processes.
74LVTH2244MTCX 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:
- 12mA, 12mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVTH2244MTCX FAQ
1.How can I place an order for 74LVTH2244MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVTH2244MTCX 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 74LVTH2244MTCX reliable?
The price and inventory of 74LVTH2244MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH2244MTCX is usually 5 days.
3.What payment methods are accepted for 74LVTH2244MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVTH2244MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVTH2244MTCX?
74LVTH2244MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVTH2244MTCX 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 74LVTH2244MTCX?
For technical support, including 74LVTH2244MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH2244MTCX requirements.
6.How does Aetrix verify that 74LVTH2244MTCX is sourced from the original manufacturer or authorized distributors?
All 74LVTH2244MTCX 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 74LVTH2244MTCX meets industry standards.
7.What is the process for return or replacement of 74LVTH2244MTCX?
All 74LVTH2244MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH2244MTCX, 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 74LVTH2244MTCX part is unused and in its original packaging.
Return procedure for 74LVTH2244MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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