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Texas Instruments SN74LVTH244ADBR
- Part No.:
- SN74LVTH244ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH244ADBR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,096
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Product details
Overview
SN74LVTH244ADBR from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation (5-V inputs/outputs with 3.3-V VCC). It features bus-hold on all data inputs, Ioff and power-up 3-state for hot insertion, and supports unregulated battery operation down to 2.7 V. Used in industrial backplane interfaces and legacy 5-V system bridging.
For engineers reviewing the SN74LVTH244ADBR datasheet, SN74LVTH244ADBR pinout, SN74LVTH244ADBR application, or SN74LVTH244ADBR equivalent, key selection criteria include its 20-pin SSOP (DB) package, ±100 µA Ioff, 0.55 V typical VOL at 64 mA, bus-hold current of ±750 µA, and tPZH/tPZL enable/disable times under 5.3 ns at 3.3 V.
Technical Context
This device implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control-1OE for Y1–Y4 and 2OE for Y1'–Y4'. The ABT (Advanced BiCMOS Technology) architecture enables TTL-level input compatibility while operating from a 3.3-V supply, eliminating level-shifters in mixed-voltage systems.
Active bus-hold circuitry maintains valid logic states on floating A-inputs without external resistors, and Ioff protection disables outputs during power-down to prevent backflow current. The design meets JESD 17 latch-up (>500 mA) and JESD 22 ESD standards (2000-V HBM, 200-V MM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated Li-ion or buck-converted supplies without external regulation. |
| IOL (max) | 64 mA - drives standard TTL loads directly; sufficient for 50-Ω transmission lines or multiple CMOS inputs. |
| tPZH (max) | 5.3 ns at VCC = 3.3 V - ensures fast bus enable timing critical for high-speed address/data latching. |
| VIK | −1.2 V - negative input clamp allows safe interfacing with 5-V signals during power sequencing. |
| Ioff | ±100 µA - prevents damaging current flow when powered off in live backplane environments. |
| Bus-Hold Current | ±750 µA - actively holds floating inputs at valid logic levels, removing need for external pullups/pulldowns. |
| θJA | 70 °C/W - thermal performance validated for DB-package operation in 70°C ambient industrial enclosures. |
Pinout & Package
SN74LVTH244ADBR uses a 20-pin SSOP (Shrink Small Outline Package), DB package, 0.65 mm pitch, 7.4 mm × 5.3 mm body, 2.0 mm max height per JEDEC MO-150.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19, 2, 18, 3, 17, 4, 16 | Data Inputs (1A1–1A4, 2A1–2A4) | Noninverting inputs for two 4-bit channels; accept 0–5.5 V inputs with bus-hold enabled. |
| 5, 15, 6, 14, 7, 13, 8, 12 | Outputs (1Y1–1Y4, 2Y1–2Y4) | 3-state buffered outputs; sink up to 64 mA or source up to 32 mA at VCC = 3.3 V. |
| 1OE (Pin 11), 2OE (Pin 10) | Output-Enable Controls | Active-low enables; tied to VCC via pullup resistor ensures high-Z state during power-up/down. |
| 9, 20 | GND, VCC | Dedicated power pins; decoupling capacitor required at VCC pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | Accepts 5-V TTL inputs and drives 5-V loads while powered from 3.3-V rail - eliminates discrete level shifters. |
| Hot-insertion support | Ioff and power-up 3-state prevent backfeed and bus contention during live card replacement in telecom chassis. |
| Integrated bus-hold | Holds unused A-inputs at valid logic levels - removes 8 external pullup resistors and associated board area/cost. |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V - reduces noise coupling into adjacent signal traces and analog sections. |
| Robust ESD/latch-up immunity | 2000-V HBM, 200-V MM ESD rating and >500 mA latch-up current - suitable for factory handling and field-replaceable modules. |
Applications
| Industrial Backplane Interface | Legacy System Voltage Translation |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA to a 5-V ISA-style backplane with address/data/control lines. IC Role / Device Role / Timing Role: Noninverting octal buffer providing bidirectional 3.3-V-to-5-V signal translation with controlled enable timing. Use Value: Eliminates need for eight discrete level translators; bus-hold prevents glitches on floating control lines during reset. |
Use Scenario: Upgrading a 5-V microcontroller-based test fixture to use a modern 3.3-V logic analyzer controller. IC Role / Device Role / Timing Role: Output driver translating 3.3-V logic analyzer outputs to drive 5-V DUT inputs with sub-5.5 ns propagation delay. Use Value: Maintains signal integrity across mixed-voltage boundaries without timing skew introduced by discrete solutions. |
| Hot-Swappable Module Control | Embedded Data Bus Isolation |
Use Scenario: Enabling/disabling communication between a main CPU board and hot-pluggable sensor module in an industrial PLC rack. IC Role / Device Role / Timing Role: 3-state buffer isolating the sensor module's I/O lines during insertion/removal using OE-controlled high-Z state. Use Value: Ioff protection prevents current backflow into powered-down modules, satisfying IEC 61000-4-2 compliance requirements. |
Use Scenario: Isolating a noisy motor driver section from a sensitive ADC subsystem on a shared PCB. IC Role / Device Role / Timing Role: Octal buffer with separate OE controls enabling precise timing-gated isolation of digital control signals. Use Value: Reduces crosstalk-induced offset errors in 16-bit ADC measurements by breaking ground loops and signal coupling paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower drive strength (24 mA IOL), no bus-hold, 1.65–3.6 V VCC range. | Suitable for low-power, single-supply 3.3-V-only systems without 5-V interface needs. | Select when cost and power are prioritized over mixed-voltage robustness and bus-hold convenience. |
| SN74AHCT244N | 5-V only VCC (4.5–5.5 V), higher propagation delay (8 ns typ), no Ioff or bus-hold. | Designed for legacy 5-V TTL systems; incompatible with 3.3-V supply rails. | Choose only for pure 5-V designs where SN74LVTH244ADBR's mixed-voltage features are unnecessary. |
Compared with SN74LVC244APWR and SN74AHCT244N, the SN74LVTH244ADBR uniquely delivers 5-V-tolerant inputs, bus-hold, and Ioff in a 3.3-V package-making it the sole option for reliable hot-insertion and legacy interface bridging without redesign.
Availability
SN74LVTH244ADBR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system voltage translation, and hot-swappable module control requiring stable component supply across extended temperature ranges (−40°C to 85°C).
Supply support for SN74LVTH244ADBR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial, automotive, and communications ICs.
The SN74LVTH244ADBR belongs to TI's LVTH (Low-Voltage BiCMOS Technology) logic family, engineered for seamless interoperability between 3.3-V logic and legacy 5-V systems in harsh industrial environments.
FAQ
What is the maximum recommended operating voltage for SN74LVTH244ADBR?
The absolute maximum supply voltage (VCC) for SN74LVTH244ADBR is 4.6 V, but the recommended operating range is strictly 2.7 V to 3.6 V per TI's SCAS586J datasheet. Operating above 3.6 V risks parametric degradation and reduced reliability, even if within absolute limits. Always maintain VCC within this window for guaranteed SN74LVTH244ADBR functionality and lifetime compliance.
Does SN74LVTH244ADBR require external pullup resistors on its data inputs?
No, SN74LVTH244ADBR does not require external pullup or pulldown resistors on its A-inputs because it integrates active bus-hold circuitry. This feature maintains valid logic states on floating inputs, and TI explicitly warns against using external resistors with bus-hold enabled. The SN74LVTH244ADBR bus-hold current is ±750 µA at VCC = 3.6 V, ensuring robust state retention without added components.
Can SN74LVTH244ADBR be used in hot-swap applications?
Yes, SN74LVTH244ADBR is explicitly designed for hot-insertion applications. Its Ioff circuitry disables outputs when VCC = 0 V, preventing damaging current backflow, and its power-up 3-state ensures outputs remain high-impedance during power ramp-up. These features are validated per TI's characterization and make SN74LVTH244ADBR suitable for telecom line cards and modular PLC backplanes where live insertion is required.
What is the thermal resistance (θJA) of the SN74LVTH244ADBR package?
The SN74LVTH244ADBR uses the SSOP (DB) package, which has a specified junction-to-ambient thermal resistance (θJA) of 70°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with two vias; actual board layout affects real-world thermal performance. For continuous 64-mA output loading, this θJA supports operation up to 85°C ambient when properly decoupled and heatsinked - a key specification confirmed in the SN74LVTH244ADBR absolute maximum ratings table.
How does SN74LVTH244ADBR handle 5-V input signals while powered from 3.3 V?
SN74LVTH244ADBR accepts 5-V input signals safely due to its overvoltage-tolerant input structure, with VI rated up to 7 V and VIK (input clamp voltage) specified at −1.2 V. Its ABT process enables TTL-compatible input thresholds (VIL = 0.8 V, VVIH = 2.0 V) while operating from 3.3 V, allowing direct connection to 5-V buses without external clamping. This capability is intrinsic to the SN74LVTH244ADBR silicon design and verified across temperature and voltage corners.
SN74LVTH244ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SSOP
SN74LVTH244ADBR FAQ
1.How can I place an order for SN74LVTH244ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH244ADBR 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 SN74LVTH244ADBR reliable?
The price and inventory of SN74LVTH244ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH244ADBR is usually 5 days.
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SN74LVTH244ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH244ADBR 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 SN74LVTH244ADBR?
For technical support, including SN74LVTH244ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH244ADBR requirements.
6.How does Aetrix verify that SN74LVTH244ADBR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH244ADBR 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 SN74LVTH244ADBR meets industry standards.
7.What is the process for return or replacement of SN74LVTH244ADBR?
All SN74LVTH244ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH244ADBR, 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 SN74LVTH244ADBR part is unused and in its original packaging.
Return procedure for SN74LVTH244ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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