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Texas Instruments SN74LV244ATDGVR
- Part No.:
- SN74LV244ATDGVR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV244ATDGVR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TVSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LV244ATDGVR from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs in a 20-pin TVSOP (DGV) package, operating from 4.5 V to 5.5 V, featuring 5.4 ns typical propagation delay at 5 V and Ioff support for partial-power-down mode. It is used in memory-address buffering, clock distribution, and bus-transceiver applications requiring TTL-compatible inputs and high-impedance isolation.
For engineers reviewing the SN74LV244ATDGVR datasheet, SN74LV244ATDGVR pinout, SN74LV244ATDGVR application, or SN74LV244ATDGVR equivalent, key selection considerations include 3-state output control per 4-bit group, ±16 mA drive strength, input voltage compatibility with TTL logic, and thermal performance in compact surface-mount layouts.
Technical Context
This device integrates two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) inputs (1OE and 2OE), enabling selective 3-state control of Y1–Y4 and Y1–Y4 outputs respectively. Inputs accept TTL-level signals (VIH = 2 V, VIL = 0.8 V) across the full 4.5–5.5 V VCC range.
The SN74LV244ATDGVR implements Ioff circuitry to disable outputs during power-down, preventing backflow current when VCC = 0 V and input/output voltages range from 0 to 5.5 V. Output switching is characterized at CL = 15 pF and CL = 50 pF, with tPLH/tPHL = 5.4 ns (typ) and tPZH/tPZL = 7.7 ns (typ) at VCC = 5 V and TA = 25°C.
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. |
| Propagation Delay (tpd) | 5.4 ns (typ) at 5 V - Enables high-speed address/data buffering in 25 MHz+ bus systems. |
| Output Drive (IOL/IOH) | ±16 mA - Supports direct driving of 50 Ω transmission lines or multiple CMOS loads. |
| Ioff Current | ≤5 µA at 0–5.5 V - Guarantees safe isolation during hot-insertion or partial-power-down sequences. |
| Input Compatibility | TTL-level (VIH = 2 V, VIL = 0.8 V) - Interoperates directly with legacy 5 V TTL logic without level-shifting. |
| 3-State Enable Time (tPHZ) | 3.9 ns (typ) at 5 V - Allows rapid bus arbitration with minimal contention window. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets JEDEC JESD22-A114/A115/C101 for robust board handling. |
Pinout & Package
SN74LV244ATDGVR uses a 20-pin Thin Very Small Outline Package (TVSOP), designated DGV, with 0.5 mm pitch, 4.4 mm width, and 6.5 mm length. The package is RoHS-compliant, green (no Sb/Br), and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Output-enable control for Y1–Y4 | Active-low signal; drives all four 1Y outputs into high-Z when high. |
| 2OE | Output-enable control for Y1–Y4 | Independent active-low control for second 4-bit group; enables dual-bus isolation. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs feeding respective Y outputs; TTL-compatible thresholds. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive-strength-matched outputs capable of sourcing/sinking ±16 mA. |
| VCC | Positive supply | Single 4.5–5.5 V rail powers both logic and output stages; no auxiliary supplies needed. |
| GND | Ground reference | Common return for all inputs, outputs, and internal circuitry; requires low-impedance PCB plane. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual OE controls | Enables selective 4-bit bus gating-e.g., isolate memory address vs. data lanes without shared enable timing. |
| Ioff partial-power-down protection | Prevents damaging current flow between powered and unpowered system domains during sequencing or hot-swap events. |
| Low ground bounce (VOLP < 0.8 V) | Reduces noise coupling into adjacent analog or clock circuits during simultaneous output switching. |
| Mixed-mode voltage operation | Allows interfacing with 3.3 V or 5 V logic on A-side while maintaining 5 V VCC-supports heterogeneous system integration. |
| High noise immunity (VIH/VIL margins) | Provides 1.2 V DC noise margin at VCC = 5 V, improving reliability in electrically noisy industrial environments. |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
|
Use Scenario: Driving multiplexed address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer isolating MCU address outputs and providing fanout to parallel memory chips. Use Value: Prevents address-line loading degradation and ensures setup/hold timing integrity across 8-bit address paths with <5.4 ns delay variation. |
Use Scenario: Distributing a single system clock to multiple peripheral ICs (e.g., ADCs, UARTs, GPIO expanders) with matched skew. IC Role / Device Role / Timing Role: Low-skew clock driver replicating and buffering a master clock signal to multiple destinations. Use Value: Delivers sub-1 ns inter-output skew and maintains signal integrity via controlled 16 mA drive into 50 Ω traces. |
| PCI/ISA Bus Transceiver Interface | Industrial I/O Expansion Module |
|
Use Scenario: Isolating and buffering bidirectional data/address/control signals between a host CPU and legacy expansion slot peripherals. IC Role / Device Role / Timing Role: 3-state bus transceiver managing direction and contention on shared 8-bit data buses. Use Value: Enables clean bus release via fast tPZH/tPLZ (3.9 ns typ), minimizing bus turnaround time and avoiding data collisions. |
Use Scenario: Interfacing programmable logic controllers (PLCs) with remote digital I/O modules over long PCB traces or ribbon cables. IC Role / Device Role / Timing Role: Robust level-shifting buffer translating controller logic levels to field-side drivers with ESD-hardened I/O. Use Value: Survives industrial transients via 2000-V HBM ESD rating and maintains signal fidelity with <0.8 V ground bounce at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Wider VCC range (1.65–3.6 V); lower drive (±24 mA); no Ioff; LVTTL input thresholds. | Suitable only for 3.3 V systems; lacks partial-power-down capability required for mixed-rail hot-swap designs. | Select when operating exclusively at 3.3 V and cost-sensitive; avoid if 5 V compatibility or Ioff is mandatory. |
| 74ACT244SCX | Higher speed (tpd = 3.5 ns); 5 V-only operation; higher ICC (40 µA typ); no Ioff; ACT logic family. | Better for ultra-fast 5 V bus buffering but incompatible with partial-power-down architectures and less ESD robust (1500-V HBM). | Choose for maximum speed in legacy 5 V-only systems where power sequencing is fixed and ESD risk is low. |
Compared with SN74LVC244APWR and 74ACT244SCX, the SN74LV244ATDGVR uniquely balances 5 V tolerance, Ioff-enabled power management, and industrial-grade ESD protection-making it optimal for mixed-voltage embedded systems requiring reliable bus isolation during dynamic power states.
Availability
SN74LV244ATDGVR is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial I/O interfaces, and legacy bus expansion requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for SN74LV244ATDGVR 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, scalability, and automotive/industrial qualification.
The SN74LV244ATDGVR belongs to TI's LV logic family, engineered for 5 V systems needing low power, high noise immunity, and robust 3-state bus interface capability in space-constrained layouts.
FAQ
What is the recommended pull-up resistor value for OE pins on the SN74LV244ATDGVR during power-up?
The SN74LV244ATDGVR datasheet specifies that OE pins must be tied to VCC through a pull-up resistor to ensure high-impedance state at power-up. Minimum resistance is determined by the driver's current-sinking capability; a 10 kΩ resistor is commonly used and verified to maintain OE >2 V during ramp-up under typical 5 V supply conditions. This value prevents unintended output activation while accommodating standard GPIO leakage limits.
Does the SN74LV244ATDGVR support mixed-voltage operation between 3.3 V inputs and 5 V VCC?
Yes, the SN74LV244ATDGVR supports mixed-mode voltage operation on all ports. Its inputs tolerate VI up to 5.5 V regardless of VCC, allowing 3.3 V logic signals to safely drive the A inputs while VCC remains at 5 V. This capability is explicitly confirmed in the datasheet's "Features" and "Recommended Operating Conditions" sections, enabling direct interfacing without external level shifters.
What is the maximum continuous output current per pin for the SN74LV244ATDGVR?
The SN74LV244ATDGVR supports ±35 mA continuous output current per pin, as specified in Absolute Maximum Ratings. However, functional operation is guaranteed only up to ±16 mA (IOL/IOH) under recommended conditions-this is the maximum current ensuring VOL ≤ 0.55 V and VOH ≥ 3.8 V at VCC = 4.5 V. Exceeding ±16 mA risks violating output voltage specs or exceeding thermal limits in sustained operation.
Can the SN74LV244ATDGVR be used in hot-swap applications?
Yes, the SN74LV244ATDGVR is designed for hot-swap use via its Ioff circuitry, which disables outputs and limits off-state current to ≤5 µA when VCC = 0 V and inputs/outputs range from 0 to 5.5 V. This prevents backfeed current into a powered-down rail. Implementation requires OE pins held high (via pull-up) during insertion, and layout must minimize parasitic coupling to avoid transient latch-up.
Is the SN74LV244ATDGVR pin-compatible with other packages in the same family?
No-SN74LV244ATDGVR uses the TVSOP (DGV) package with 0.5 mm pitch and specific pinout; it is not pin-compatible with SOIC (DW), TSSOP (PW), or VQFN (RGY) variants. While all share identical logic functionality and pin numbering sequence, physical dimensions, pad layouts, and thermal pads differ. PCB design must match the DGV footprint, including 4.4 mm width and 6.5 mm length per JEDEC MO-187.
SN74LV244ATDGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-TFSOP (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:
- 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-TVSOP
SN74LV244ATDGVR FAQ
1.How can I place an order for SN74LV244ATDGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244ATDGVR 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 SN74LV244ATDGVR reliable?
The price and inventory of SN74LV244ATDGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244ATDGVR is usually 5 days.
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SN74LV244ATDGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244ATDGVR 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 SN74LV244ATDGVR?
For technical support, including SN74LV244ATDGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244ATDGVR requirements.
6.How does Aetrix verify that SN74LV244ATDGVR is sourced from the original manufacturer or authorized distributors?
All SN74LV244ATDGVR 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 SN74LV244ATDGVR meets industry standards.
7.What is the process for return or replacement of SN74LV244ATDGVR?
All SN74LV244ATDGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244ATDGVR, 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 SN74LV244ATDGVR part is unused and in its original packaging.
Return procedure for SN74LV244ATDGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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