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Texas Instruments SN74LV244ATDBR
- Part No.:
- SN74LV244ATDBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV244ATDBR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,862
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Product details
Overview
SN74LV244ATDBR from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for memory-address, clock, and bus-oriented applications. It operates from 4.5 V to 5.5 V, delivers typical propagation delay of 5.4 ns at 5 V, supports TTL-voltage-compatible inputs, and features Ioff partial-power-down protection. Used in industrial control backplanes and embedded data buses.
For engineers reviewing the SN74LV244ATDBR datasheet, SN74LV244ATDBR pinout, SN74LV244ATDBR application, or SN74LV244ATDBR equivalent, key selection criteria include 3-state output timing (tPLZ/tPHZ ≤ 12 ns), ±16 mA drive strength, SOIC-20 package compatibility, and Ioff-enabled system-level power sequencing.
Technical Context
This device integrates two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control-1OE governs Y1–Y4, 2OE governs Y1′–Y4′. Inputs accept TTL-level signals (VIL = 0.8 V, VIH = 2 V) across full 4.5–5.5 V VCC range, enabling mixed-mode voltage interfacing with legacy 5-V logic.
The Ioff circuitry actively disables outputs when VCC = 0 V, blocking current backflow up to 5 µA per pin, critical for hot-swap and partial-power-down systems. Output ground bounce (VOLP < 0.8 V) and undershoot (VOHV > 2.3 V) are characterized at 5 V, supporting noise-resilient signal integrity in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5-V supply tolerances. |
| tpd (Typical) | 5.4 ns at VCC = 5 V - Enables high-speed address/data buffering in 20+ MHz bus systems. |
| IOL / IOH | ±16 mA - Drives standard 50-Ω transmission lines or multiple CMOS loads without external buffers. |
| Ioff Max | 5 µA - Prevents damaging back-current during power sequencing or hot-insertion events. |
| VOL / VOH | 0.55 V / 3.8 V at IOL = 16 mA, IOH = –16 mA - Guarantees robust logic-level margins under full load. |
| tPZH / tPLZ | ≤ 12 ns (CL = 50 pF) - Defines maximum enable/disable latency for dynamic bus arbitration. |
| ESD Rating | 2000-V HBM - Meets industrial IEC 61000-4-2 level for board-level ESD immunity. |
Pinout & Package
SN74LV244ATDBR uses a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, 2.65 mm max height, RoHS-compliant CU NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for first and second 4-bit buffer sections - tie high via pullup for safe power-up high-Z state. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Noninverting input terminals - accept TTL/CMOS logic levels; all unused inputs must be tied to VCC or GND. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs - present high-impedance state when OE = high, reducing bus contention. |
| 10, 20 | GND, VCC | Power supply pins - decoupling capacitor (0.1 µF) required adjacent to Pin 20 for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Voltage-Compatible Inputs | Accepts 0.8 V/2.0 V thresholds at 4.5–5.5 V VCC - eliminates level-shifter need when interfacing with legacy 5-V microcontrollers. |
| Ioff Partial-Power-Down Protection | Blocks >99% of back-current flow when VCC = 0 V - enables safe insertion into live backplanes or multi-rail systems. |
| Low Ground Bounce (VOLP) | <0.8 V at 5 V - minimizes simultaneous switching noise on shared VCC/GND rails in high-density digital boards. |
| 3-State Output Enable Timing | tPZH/tPLZ ≤ 8 ns (CL = 15 pF) - supports sub-100 MHz bus turnaround in bidirectional data paths. |
| Mixed-Mode Voltage Operation | Inputs tolerate 0–5.5 V regardless of VCC - allows direct connection to 3.3-V FPGA I/O banks while powered from 5-V rail. |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Address Bus Driver |
|---|---|
|
Use Scenario: Isolating and driving 8-bit address lines between a microcontroller and multiple peripheral ICs on a noisy factory-floor PCB. IC Role / Device Role / Timing Role: Noninverting 3-state buffer that enables/disables address routing under software control, preventing bus conflicts during peripheral access. Use Value: ±16 mA drive strength ensures clean edge integrity over 10-cm traces; Ioff prevents latch-up during controller reset sequences. |
Use Scenario: Expanding GPIO count by latching and buffering parallel data from an MCU to external SRAM or display controller. IC Role / Device Role / Timing Role: Octal driver providing low-latency (5.4 ns) signal translation between MCU port and memory interface, with independent OE control per group. Use Value: Dual 4-bit sections allow interleaved read/write handshaking; VOL/VOH specs guarantee reliable logic recognition at 20-MHz bus speeds. |
| Legacy ISA Bus Signal Repeater | Test Equipment Digital I/O Expansion Module |
|
Use Scenario: Re-driving degraded address/data signals across long ISA bus segments in retro-computing diagnostic hardware. IC Role / Device Role / Timing Role: Signal integrity restoration element placed mid-bus to compensate for capacitive loading and trace loss. Use Value: 5.4 ns tpd preserves setup/hold timing margins; SOIC-20 footprint matches vintage board layouts without redesign. |
Use Scenario: Adding isolated 8-bit parallel I/O channels to automated test fixtures requiring precise timing and hot-swap capability. IC Role / Device Role / Timing Role: Configurable digital buffer enabling synchronized stimulus/response capture with programmable enable gating. Use Value: Ioff support allows module insertion while main controller remains powered; 2000-V HBM rating withstands lab ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Wider VCC range (1.65–3.6 V), lower drive (±24 mA), no Ioff, 3.3-V only. | Not suitable for 5-V legacy systems; requires level shifters if interfacing with 5-V peripherals. | Select only for new 3.3-V designs where lower power and smaller TSSOP-20 package are prioritized. |
| 74ACT244SC | Higher speed (tpd ≈ 3.5 ns), 5-V only, no Ioff, higher ICC (20 mA typical), obsolete status. | Lacks partial-power-down safety; unsuitable for hot-plug or multi-rail systems. | Use only for drop-in replacement in legacy 74ACT-based designs where TI's active SN74LV244ATDBR is unavailable. |
Compared with SN74LVC244APWR and 74ACT244SC, SN74LV244ATDBR uniquely balances 5-V compatibility, Ioff safety, and industrial temperature range (–40°C to 85°C) without sacrificing timing performance - making it the preferred choice for mixed-voltage, field-deployable equipment.
Availability
SN74LV244ATDBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller address expansion, and legacy bus repeater applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for SN74LV244ATDBR 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 innovation in industrial, automotive, and communications markets.
The SN74LV244ATDBR belongs to TI's LV-A family of low-voltage, high-speed logic devices engineered for robust 5-V system interfacing, emphasizing noise immunity, power sequencing safety, and backward compatibility with TTL standards.
FAQ
What is the recommended power-up sequence for SN74LV244ATDBR to avoid bus contention?
TI specifies that OE pins must be held high (via pullup resistor to VCC) during power-up to ensure outputs remain in high-impedance state until system initialization completes. For SN74LV244ATDBR, a 10-kΩ pullup on Pins 1 and 19 to VCC meets this requirement and prevents unintended signal assertion on shared buses before firmware configures OE control.
Does SN74LV244ATDBR support hot-swap operation in live backplane systems?
Yes - SN74LV244ATDBR incorporates Ioff circuitry that limits current backflow to ≤5 µA when VCC = 0 V, enabling safe insertion into powered backplanes. This feature is validated per JESD 78 and makes SN74LV244ATDBR suitable for modular industrial controllers requiring field-replaceable I/O modules without system shutdown.
Can SN74LV244ATDBR interface directly with 3.3-V FPGA I/O banks while powered from a 5-V rail?
Yes - SN74LV244ATDBR accepts input voltages up to 5.5 V regardless of VCC, allowing direct connection of 3.3-V FPGA outputs to its A-inputs. Its VIH = 2.0 V and VIL = 0.8 V thresholds are compatible with 3.3-V LVTTL logic, eliminating external level shifters when SN74LV244ATDBR is used as a 5-V bus driver driven by 3.3-V sources.
What is the maximum capacitive load SN74LV244ATDBR can drive while maintaining specified timing?
SN74LV244ATDBR timing parameters (e.g., tPLH = 5.4 ns) are characterized at CL = 15 pF and CL = 50 pF. Driving loads beyond 50 pF increases propagation delay nonlinearly; TI recommends limiting total trace + load capacitance to ≤50 pF for guaranteed 5.4 ns performance. For heavier loads, add series termination or use a driver with higher IOL/IOH.
Is SN74LV244ATDBR pin-compatible with older 74LS244 or 74HC244 devices?
No - SN74LV244ATDBR shares the same 20-pin SOIC (DW) footprint and functional pinout (e.g., Pin 1 = 1OE, Pin 2 = 1A1) with 74LS244 and 74HC244, but electrical behavior differs: LV-A family has higher noise immunity, Ioff, and tighter VOL/VOH specs. Direct substitution is possible in most cases, but verify OE logic polarity and power sequencing requirements before replacement.
SN74LV244ATDBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 16mA, 16mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LV244ATDBR FAQ
1.How can I place an order for SN74LV244ATDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244ATDBR 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 SN74LV244ATDBR reliable?
The price and inventory of SN74LV244ATDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244ATDBR is usually 5 days.
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4.How is shipping managed for SN74LV244ATDBR?
SN74LV244ATDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244ATDBR 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 SN74LV244ATDBR?
For technical support, including SN74LV244ATDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244ATDBR requirements.
6.How does Aetrix verify that SN74LV244ATDBR is sourced from the original manufacturer or authorized distributors?
All SN74LV244ATDBR 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 SN74LV244ATDBR meets industry standards.
7.What is the process for return or replacement of SN74LV244ATDBR?
All SN74LV244ATDBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244ATDBR, 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 SN74LV244ATDBR part is unused and in its original packaging.
Return procedure for SN74LV244ATDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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