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Texas Instruments SN74ALVC244DGVR
- Part No.:
- SN74ALVC244DGVR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ALVC244DGVR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TVSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ALVC244DGVR from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 1.65 V to 3.6 V VCC operation. It features two independent 4-bit channels, each with separate output-enable (OE) inputs, ±24-mA drive strength at 3.3 V, 2.8 ns max propagation delay, and ESD protection exceeding JESD 22 standards. It is used in bidirectional bus interfacing and level translation between mixed-voltage logic domains.
For engineers reviewing the SN74ALVC244DGVR datasheet, SN74ALVC244DGVR pinout, SN74ALVC244DGVR application, or SN74ALVC244DGVR equivalent, this page delivers verified electrical parameters, TVSOP-20 package details, functional behavior under power-up sequencing, latch-up immunity per JESD 17, and real-world substitution guidance - all grounded in TI's SCES188G revision October 2004 production data.
Technical Context
This device implements dual 4-bit non-inverting buffers with independent 3-state control: 1OE governs Y1–Y4 outputs, 2OE governs Y1–Y4 of the second channel. Each output transitions to high-impedance when its OE is high, enabling shared-bus arbitration without external pull-ups. Input thresholds scale with VCC (VIH = 0.65×VCC min at 1.65 V), supporting mixed-supply system interoperability.
It operates across –40°C to 85°C with guaranteed performance at 1.65 V, 2.5 V, and 3.3 V supply rails. Output drive capability is specified at ±24 mA (IOL/IOH) only at VCC = 3.0 V; at 1.65 V, it drops to ±4 mA. Power dissipation capacitance is 26 pF per buffer at 3.3 V with outputs enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports direct interface between 1.8-V, 2.5-V, and 3.3-V logic subsystems without level shifters. |
| Max Propagation Delay | 2.8 ns at VCC = 3.3 V - enables reliable operation in high-speed digital control paths up to ~350 MHz toggle rate. |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - sufficient to drive 50-Ω transmission lines or fan-out to ≥10 LVTTL loads. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 3.3 V - ensures noise margin >0.7 V in 3.3-V systems. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial IEC 61000-4-2 system-level robustness requirements. |
| Latch-Up Immunity | >250 mA per JESD 17 - prevents destructive current runaway during transient overvoltage events. |
| Quiescent Current | 10 µA max at VCC = 3.6 V - suitable for low-power standby modes in portable and battery-backed systems. |
Pinout & Package
SN74ALVC244DGVR uses a 20-pin TVSOP (Thin Very Small Outline Package) with 0.5-mm pitch, 6.6 mm × 4.4 mm body, and 1.2 mm max height. Pin 1 index is located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Channel 1 Output Enable (active-low) | Drives Y1–Y4 into high-Z when logic high; tie to VCC via pull-up for power-up safety. |
| 1A1–1A4 | Channel 1 Data Inputs | Non-inverting inputs for first 4-bit buffer group; accept 1.65–3.6 V CMOS-compatible signals. |
| 1Y1–1Y4 | Channel 1 Outputs | 3-state buffered outputs with ±24-mA sink/source at 3.3 V; high-Z when 1OE = high. |
| 2OE | Channel 2 Output Enable (active-low) | Independent enable for second 4-bit group; allows asymmetric bus gating. |
| 2A1–2A4 | Channel 2 Data Inputs | Second set of non-inverting inputs; electrically isolated from Channel 1 except shared VCC/GND. |
| 2Y1–2Y4 | Channel 2 Outputs | Match 1Yx timing and drive specs; enables full 8-bit bidirectional bus control with two OE pins. |
| VCC | Power Supply | Single supply input; must be decoupled locally with 0.1-µF ceramic capacitor near pin 19. |
| GND | Ground Reference | Common return for all I/O and internal circuitry; connect to solid ground plane for signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit channels | Enables split-bus control: e.g., address vs. data lanes on same PCB trace bundle with separate OE timing. |
| 1.65-V to 3.6-V VCC operation | Eliminates need for external voltage translators when interfacing FPGA I/O banks (1.8 V) to microcontroller peripherals (3.3 V). |
| 2.8 ns tpd at 3.3 V | Supports setup/hold timing margins in 100-MHz synchronous bus designs with ≤1.5-ns skew budget. |
| ±24-mA output drive | Drives unterminated 50-Ω PCB traces directly, reducing BOM count versus adding discrete series resistors. |
| JESD 22-compliant ESD protection | Withstands 2000-V HBM exposure - critical for manufacturing handling and field-replaceable module insertion. |
| Thermal pad not present | TVSOP (DGV) package lacks exposed thermal pad; power dissipation limited to 350 mW (θJA = 92°C/W). |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating CPU address/data bus from modular I/O cards in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Bidirectional 8-bit buffer with independent OE control for read/write direction management and hot-swap safe isolation. Use Value: Prevents bus contention during card insertion/removal; ±24-mA drive sustains signal integrity over 15-cm backplane traces at 25 MHz. |
Use Scenario: Expanding GPIO count of ARM Cortex-M4 MCU by connecting parallel LCD controller or memory-mapped peripheral. IC Role / Device Role / Timing Role: Level-translating buffer between 3.3-V MCU core and 1.8-V display driver IC. Use Value: 1.65–3.6-V VCC range eliminates external level shifters; 2.8-ns tpd preserves timing closure in 80-MHz pixel clock domains. |
| FPGA Configuration Data Latching | Test Equipment Signal Routing Matrix |
Use Scenario: Holding configuration bitstream from SPI flash during FPGA power-up before internal logic initializes. IC Role / Device Role / Timing Role: Octal latch/buffer with OE-controlled hold function; outputs remain stable while FPGA configures. Use Value: High-impedance state during reset prevents back-driving flash outputs; VIH/VIL scaling ensures reliable capture at 2.5-V VCC. |
Use Scenario: Dynamic reconfiguration of analog/digital signal paths in automated test equipment using relayless solid-state switching. IC Role / Device Role / Timing Role: Low-latency 3-state gate for multiplexing 8-channel DUT stimulus/response lines. Use Value: 2.8-ns propagation delay enables sub-10-ns path selection; ±24-mA drive handles 100-pF cable + fixture capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Same pinout, identical logic function, but LVC family has higher ICC (max 10 µA vs. ALVC's 10 µA), identical tpd (2.8 ns), and same VCC range. | LVC variant offers marginally better noise immunity (VIH = 2.0 V min at 3.3 V vs. ALVC's 2.0 V), but no functional advantage in most designs. | Select SN74LVC244APWR only if legacy LVC qualification is required; SN74ALVC244DGVR preferred for lower dynamic power at 1.8-V operation. |
| 74AVC244BQX | Nexperia part in DHVQFN-20 (3.5 × 4.5 mm); same 1.2–3.6 V range, 2.5 ns tpd, ±24 mA drive, but different pinout and no JEDEC MO-153 registration. | Requires PCB redesign due to incompatible footprint and pin mapping; thermal pad improves θJA to 45°C/W vs. DGV's 92°C/W. | Choose 74AVC244BQX only when thermal performance is critical and layout revision is acceptable; SN74ALVC244DGVR remains optimal for drop-in replacement in existing TVSOP footprints. |
Compared with SN74LVC244APWR, SN74ALVC244DGVR delivers identical timing and drive but with tighter VIH/VIL tolerances at low VCC (1.65 V), making it superior for 1.8-V systems. Against 74AVC244BQX, it trades thermal efficiency for mechanical compatibility - retaining the same board space and solder profile as legacy SOIC-20 designs.
Availability
SN74ALVC244DGVR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus expansion, FPGA configuration latching, and automated test equipment signal routing requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALVC244DGVR 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 over 50 years of innovation in high-reliability interface ICs.
The SN74ALVC244DGVR belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for low-voltage mixed-signal systems requiring fast propagation, rail-to-rail input compatibility, and robust ESD tolerance in industrial and automotive environments.
FAQ
What is the recommended power-up sequence for SN74ALVC244DGVR?
TI recommends tying both 1OE and 2OE to VCC through pull-up resistors (≤10 kΩ) during power-up to ensure outputs remain in high-impedance until system control logic initializes. This prevents bus contention on shared data lines. The SN74ALVC244DGVR datasheet specifies that OE should be held high before VCC reaches 1.5 V to guarantee safe startup behavior.
Does SN74ALVC244DGVR support hot-swap operation?
Yes - SN74ALVC244DGVR supports hot-swap when OE pins are actively controlled. Its JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM) allow safe insertion into live backplanes. However, uncontrolled OE states during insertion can cause momentary bus contention; use sequenced OE assertion after VCC stabilization for robust operation.
Can SN74ALVC244DGVR drive 50-Ω transmission lines directly?
Yes - SN74ALVC244DGVR provides ±24-mA output drive at 3.0 V, sufficient to source/sink full current into a 50-Ω load (±1.2 V swing). At 3.3 V, VOH reaches 2.4 V and VOL drops to 0.55 V under 24-mA load, meeting TTL-compatible thresholds. For best signal integrity, place series termination resistors close to the driver output.
What is the thermal resistance (θJA) of SN74ALVC244DGVR in its TVSOP package?
The SN74ALVC244DGVR in TVSOP (DGV) package has a junction-to-ambient thermal resistance (θJA) of 92°C/W, measured per JESD 51-7 on a standard 4-layer JEDEC test board. This value assumes no copper pour under the package; adding a 100-mm² thermal pad reduces θJA by ~25°C/W, though the DGV package lacks an exposed thermal pad unlike RGY or PW variants.
How does SN74ALVC244DGVR differ from SN74ALVC244DW?
SN74ALVC244DGVR and SN74ALVC244DW share identical logic functionality, timing, and DC specifications, but differ in package: DGVR uses 20-pin TVSOP (0.5-mm pitch, 6.6 × 4.4 mm), while DW uses 20-pin SOIC (1.27-mm pitch, 12.8 × 7.5 mm). The TVSOP version saves >60% board area and supports finer-pitch routing, but has higher θJA (92°C/W vs. 58°C/W for DW).
SN74ALVC244DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 20-TFSOP (0.173", 4.40mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TVSOP
SN74ALVC244DGVR FAQ
1.How can I place an order for SN74ALVC244DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC244DGVR 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 SN74ALVC244DGVR reliable?
The price and inventory of SN74ALVC244DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC244DGVR is usually 5 days.
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SN74ALVC244DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC244DGVR 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 SN74ALVC244DGVR?
For technical support, including SN74ALVC244DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC244DGVR requirements.
6.How does Aetrix verify that SN74ALVC244DGVR is sourced from the original manufacturer or authorized distributors?
All SN74ALVC244DGVR 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 SN74ALVC244DGVR meets industry standards.
7.What is the process for return or replacement of SN74ALVC244DGVR?
All SN74ALVC244DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC244DGVR, 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 SN74ALVC244DGVR part is unused and in its original packaging.
Return procedure for SN74ALVC244DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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