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Texas Instruments SN74ALVTH16244DLR
- Part No.:
- SN74ALVTH16244DLR
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVTH16244DLR.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,894
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Product details
Overview
SN74ALVTH16244DLR from Texas Instruments is a 2.5-V/3.3-V 16-bit noninverting buffer/driver with 3-state outputs, designed for mixed-voltage system interfacing between 3.3-V logic and 5-V TTL environments. It delivers ±32 mA high-drive capability, supports bus-hold on all 16 data inputs, and operates across –40°C to 85°C. Used in backplane I/O expansion and memory address buffering where level translation and hot-swap resilience are required.
For engineers reviewing the SN74ALVTH16244DLR datasheet, SN74ALVTH16244DLR pinout, SN74ALVTH16244DLR application, or SN74ALVTH16244DLR equivalent, key selection criteria include its 3.3-V VCC operation with 5-V tolerant I/O, auto-3-state behavior above VCC, Ioff-enabled hot insertion support, and DL-package thermal resistance of 94°C/W.
Technical Context
This device implements four independent 4-bit buffer sections (1Y–4Y), each controlled by dedicated OE pins (1OE–4OE), enabling granular bus segment control. Its Advanced BiCMOS Technology (ABT) architecture ensures low static power dissipation while maintaining TTL-compatible output thresholds at 3.3-V supply.
The integrated bus-hold circuitry actively maintains valid logic levels on floating inputs without external resistors, and the auto-3-state feature disables outputs when VO exceeds VCC-critical for preventing contention during voltage sequencing mismatches in mixed-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Supports regulated 2.5-V and 3.3-V rails; tolerates unregulated battery down to 2.3 V. |
| IOH/IOL (3.3 V) | –32 mA / 64 mA - Drives heavy capacitive loads or multiple TTL inputs without external buffers. |
| VIH/VIL (3.3 V) | 2.0 V / 0.8 V - Compatible with standard 3.3-V CMOS logic thresholds and 5-V TTL input levels. |
| tPLH/tPHL (CL=50 pF) | 1 ns / 2.5 ns - Enables sub-5-ns propagation delay in high-speed address/data paths. |
| Bus-Hold Current | ±75 µA at VI = 2.0 V - Maintains stable logic state on unterminated inputs up to ±500 µA dynamic overdrive. |
| Ioff Leakage | ±100 µA at VCC = 0 - Blocks current backflow during hot insertion or partial power-down. |
| θJA (DL package) | 94°C/W - Defines thermal derating limit for continuous 128-mA output current in still-air PCB layouts. |
Pinout & Package
SN74ALVTH16244DLR uses a 48-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, 0.5-mm lead pitch, 1.2-mm max height, JEDEC MO-153 compliant. Pin 1 identifier located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Output Enable (active-low) | Independent control per 4-bit section; asserts 3-state when high; tied to VCC via pullup for power-up safety. |
| 1A1–4A4 (pins 1–4, 7–10, 13–16, 19–22) | Data Inputs | All feature bus-hold; eliminate need for external pullups/pulldowns on unused lines. |
| 1Y1–4Y4 (pins 2–5, 8–11, 14–17, 20–23) | Buffered Outputs | Noninverting; support auto-3-state if VO > VCC; rated for –32 mA sink / 64 mA source at 3.3 V. |
| VCC (pins 7, 25, 32, 40) | Power Supply | Four distributed VCC pins reduce IR drop and improve noise immunity across 16-bit bus. |
| GND (pins 4, 12, 24, 30, 37, 45) | Ground | Six GND pins provide low-inductance return paths for high-speed switching currents. |
Key Features
| Feature | Design Value |
|---|---|
| 5-V Tolerant I/O | Accepts 0–5.5 V inputs and drives 5-V TTL loads while powered from 3.3-V VCC-enables seamless interface with legacy systems. |
| Auto-3-State Protection | Outputs automatically enter high-impedance when output voltage exceeds VCC-prevents bus contention during supply ramping or fault conditions. |
| Hot-Insertion Support | Ioff and power-up 3-state ensure zero current backflow and no driver conflict during live board insertion into powered backplanes. |
| Mixed-Mode Signal Operation | Simultaneous 5-V input signals and 3.3-V VCC supply enable direct connection to 5-V peripherals without level shifters. |
| Latch-Up Immunity | Exceeds 250 mA per JESD17-ensures robustness against transient-induced latch-up in industrial environments. |
Applications
| Backplane I/O Expansion | Memory Address Buffering |
|---|---|
Use Scenario: Expanding peripheral slots in modular industrial controllers using shared 5-V data/address buses. IC Role / Device Role / Timing Role: Level-translating buffer isolating 3.3-V FPGA/CPU address/data lines from 5-V backplane segments. Use Value: Eliminates discrete level shifters; bus-hold prevents glitches on unterminated slots; auto-3-state avoids contention during hot-plug events. | Use Scenario: Driving high-capacitance SRAM or Flash memory address lines from a 3.3-V microcontroller. IC Role / Device Role / Timing Role: Noninverting 16-bit address driver with sub-3-ns propagation delay and ±64 mA drive strength. Use Value: Reduces address setup time margin; sustains signal integrity across 10+ cm traces; eliminates need for series termination. |
| Industrial PLC Module Interface | Legacy System Interfacing |
Use Scenario: Connecting modern 3.3-V communication processors to legacy 5-V sensor/actuator modules. IC Role / Device Role / Timing Role: Bidirectional voltage translator with configurable 4-bit sections for isolated signal routing. Use Value: Enables reuse of existing 5-V field wiring; Ioff protects processor during module replacement; bus-hold stabilizes inputs during sensor disconnect. | Use Scenario: Integrating new 3.3-V logic into aging test equipment with 5-V TTL signaling standards. IC Role / Device Role / Timing Role: TTL-compatible buffer providing noise-immune signal regeneration and fanout multiplication. Use Value: Restores signal margins degraded by long cables; withstands ground bounce up to 0.8 V; supports mixed-voltage debugging interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16244ADGGR | Lower drive (–24 mA/24 mA), no bus-hold, 1.65–3.6 V VCC range, TSSOP-48 (DGG). | Not suitable for 5-V-tolerant interfaces or floating-input scenarios without external resistors. | Select when cost sensitivity outweighs 5-V tolerance and bus-hold requirements. |
| SN74AVC16244DGGR | 2.3–3.6 V VCC, ±12 mA drive, no bus-hold, supports 1.8-V/2.5-V/3.3-V mixed-mode, TSSOP-48. | Lacks 5-V input tolerance and auto-3-state; requires explicit OE control during power transitions. | Prefer for ultra-low-voltage multi-rail systems where 5-V compatibility is unnecessary. |
Compared with SN74LVC16244ADGGR and SN74AVC16244DGGR, the SN74ALVTH16244DLR uniquely combines 5-V I/O tolerance, bus-hold, auto-3-state, and ±32 mA/64 mA drive-making it irreplaceable in legacy-interfacing and hot-swap-critical designs despite its DL-package obsolescence status.
Availability
SN74ALVTH16244DLR is available at Aetrix Electronics and suitable for industrial PLC module interface, backplane I/O expansion, and memory address buffering requiring stable component supply amid long product lifecycles.
Supply support for SN74ALVTH16244DLR 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 logic solutions with decades of industrial-grade reliability validation.
The ALVTH family was engineered for robust mixed-voltage system interfacing-specifically targeting 3.3-V logic integration with legacy 5-V infrastructure in telecom, industrial automation, and test equipment.
FAQ
What is the operating temperature range for SN74ALVTH16244DLR?
The SN74ALVTH16244DLR is characterized for operation from –40°C to +85°C ambient temperature. This range is validated per the recommended operating conditions in the SCES070G datasheet and applies specifically to the SN74ALVTH16244DLR in its DL-package configuration. Thermal derating must be applied beyond this range due to θJA = 94°C/W.
Does SN74ALVTH16244DLR support hot insertion?
Yes, SN74ALVTH16244DLR supports hot insertion via two complementary features: Ioff circuitry disables outputs when VCC = 0, blocking damaging current backflow; and power-up 3-state forces outputs into high-impedance during power ramping. Both are verified per JESD78 and documented in the SCES070G datasheet Section 2.
Can SN74ALVTH16244DLR interface directly with 5-V TTL inputs?
Yes, SN74ALVTH16244DLR accepts 0–5.5 V input voltages while powered from 3.3-V VCC, satisfying TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). Its 5-V tolerant inputs are explicitly specified in the Absolute Maximum Ratings and Recommended Operating Conditions tables of SCES070G.
What is the purpose of bus-hold circuitry in SN74ALVTH16244DLR?
The bus-hold circuitry in SN74ALVTH16244DLR actively maintains a valid logic level on unused or floating data inputs without external resistors. It sources or sinks up to ±75 µA (at 3.3 V) to hold the input near VIH or VIL, preventing metastability and EMI in unterminated stubs-confirmed in the Electrical Characteristics table on page 6 of SCES070G.
Is SN74ALVTH16244DLR pin-compatible with other ALVTH16244 variants?
Yes, SN74ALVTH16244DLR shares identical pinout and functionality with SN74ALVTH16244GR (TSSOP-DGG) and SN74ALVTH16244VR (TVSOP-DGV), as confirmed by the "SN74ALVTH16244 . . . DGG, DGV, OR DL PACKAGE" note on page 1 of SCES070G and matching logic diagrams across packages.
SN74ALVTH16244DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVTH
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.3V ~ 2.7V, 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74ALVTH16244DLR FAQ
1.How can I place an order for SN74ALVTH16244DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVTH16244DLR 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 SN74ALVTH16244DLR reliable?
The price and inventory of SN74ALVTH16244DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVTH16244DLR is usually 5 days.
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Once your SN74ALVTH16244DLR 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 SN74ALVTH16244DLR?
For technical support, including SN74ALVTH16244DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVTH16244DLR requirements.
6.How does Aetrix verify that SN74ALVTH16244DLR is sourced from the original manufacturer or authorized distributors?
All SN74ALVTH16244DLR 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 SN74ALVTH16244DLR meets industry standards.
7.What is the process for return or replacement of SN74ALVTH16244DLR?
All SN74ALVTH16244DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVTH16244DLR, 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 SN74ALVTH16244DLR part is unused and in its original packaging.
Return procedure for SN74ALVTH16244DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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