My Inquiry
My Account
Texas Instruments SN74LV244APWR
- Part No.:
- SN74LV244APWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV244APWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,556
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LV244APWR from Texas Instruments is an octal 3-state buffer/driver IC designed for bidirectional signal buffering in bus-oriented systems. It features dual 4-bit groups with independent output-enable (OE) controls, operates from 2 V to 5.5 V, delivers ≤6.5 ns propagation delay at 5 V, supports mixed-mode voltage operation, and includes Ioff partial-power-down capability. It is used in server backplanes to isolate and drive address/data lines between CPU and memory controllers.
For engineers reviewing the SN74LV244APWR datasheet, SN74LV244APWR pinout, SN74LV244APWR application, or SN74LV244APWR equivalent, key selection considerations include its 20-pin TSSOP (PW) package, 3-state output behavior, ±16 mA drive strength at 3.3 V/5 V, thermal performance (RθJA = 128.2 °C/W), and compatibility with industrial temperature range (–40°C to 125°C).
Technical Context
The SN74LV244APWR implements two independent 4-bit noninverting buffer groups, each controlled by a dedicated OE input. Its CMOS inputs accept 2-V to 5.5-V logic levels, while outputs drive up to ±16 mA with balanced sourcing/sinking capability and support high-impedance state for bus sharing.
It integrates Ioff circuitry that disables all outputs when VCC = 0 V, preventing current backflow during partial power-down. The device meets JESD17 latch-up immunity (>250 mA) and supports fast edge rates (≤20 ns/V at 5 V), requiring careful PCB layout to manage ground bounce (VOLP < 0.8 V) and undershoot (VOHV > 2.3 V) at 3.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables interoperability across 2.5 V, 3.3 V, and 5 V logic domains without level shifters |
| tpd (Max) | 6.5 ns at VCC = 5 V, CL = 50 pF - ensures sub-150 MHz timing margin for synchronous bus interfaces |
| IOH/IOL | ±16 mA at VCC = 4.5–5.5 V - drives standard TTL loads and LEDs directly without external transistors |
| Ioff Leakage | ±5 µA at VCC = 0 V - prevents signal corruption on powered-down buses in hot-swap systems |
| Operating Temp | –40°C to +125°C - qualified for industrial and telecom infrastructure environments |
| ESD Rating | ±2000 V HBM - withstands handling and board-level ESD events per JEDEC JS-001 |
| Cpd | 16 pF at 5 V - determines dynamic power consumption (P = Cpd × V² × f) in high-frequency applications |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 7.8 mm body, 0.65 mm pitch, exposed pad optional (not electrically required). Pin 10 = GND, Pin 20 = VCC, thermal pad not connected or tied to GND per RKS variant guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input | Eight buffered data inputs, grouped as two independent 4-bit channels |
| 1Y1–1Y4, 2Y1–2Y4 | Output | Eight 3-state outputs; each group enabled separately via OE pins |
| 1OE, 2OE | Input | Active-low enable controls for respective 4-bit groups; must be pulled high for Hi-Z at power-up |
| VCC (Pin 20) | Power | Single supply rail supporting full 2–5.5 V operating range; requires local 0.1-µF bypass |
| GND (Pin 10) | Reference | Common return path for all I/O and supply currents; critical for noise control and VOL accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Accepts 2–5.5 V inputs while powered from any VCC in same range - eliminates level translators in multi-voltage systems |
| Low ground bounce (VOLP) | <0.8 V at 3.3 V - reduces false triggering on shared ground planes in dense digital boards |
| Controlled output undershoot (VOHV) | >2.3 V at 3.3 V - maintains noise margin during fast transitions into capacitive loads |
| Partial power-down (Ioff) | Blocks current flow when VCC = 0 V - enables safe insertion/removal in live-backplane applications |
| Latch-up immunity | >250 mA per JESD17 - guarantees robustness against transient overcurrent events |
Applications
| Server Backplane Buffering | LED Display Column Driver |
|---|---|
Use Scenario: Driving parallel address/data lines between CPU and DDR memory controller across 15-cm PCB traces. IC Role / Device Role / Timing Role: Signal repeater and bus isolator with 3-state control to prevent contention during memory arbitration. Use Value: 6.5 ns tpd ensures setup/hold timing closure at 100 MHz clock rates; ±16 mA drive sustains signal integrity over FR4 loss. | Use Scenario: Sourcing current to 8× LED columns in a 64×32 dot-matrix display with multiplexed scanning. IC Role / Device Role / Timing Role: Constant-current column driver enabling simultaneous activation of up to four columns per cycle. Use Value: 16 mA per output matches typical red/green LED forward current; 3-state allows blanking between scan phases. |
| Telecom Line Card Interface | Motor Drive Logic Isolation |
Use Scenario: Level-shifting and buffering control signals between FPGA-based packet processor and PHY transceivers on line cards. IC Role / Device Role / Timing Role: Voltage-domain translator and fanout buffer for GPIO, reset, and interrupt lines. Use Value: 2–5.5 V VCC range accommodates both 3.3 V FPGA I/O and 5 V legacy PHY interfaces without external components. | Use Scenario: Isolating microcontroller PWM outputs from gate drivers in BLDC motor inverters. IC Role / Device Role / Timing Role: Digital signal conditioner adding drive strength and noise immunity before optocoupler inputs. Use Value: Ioff protection prevents backfeed from gate driver supplies during MCU power-down sequences. |
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 |
|---|---|---|---|
| SN74LVC244APW | Lower VCC min (1.65 V), higher speed (4.5 ns @ 3.3 V), but reduced Ioff rating (±10 µA vs ±5 µA) | Better suited for battery-powered 1.8 V systems; less robust in hot-swap partial-power-down scenarios | Choose SN74LVC244APW only if 1.65–3.6 V operation is required and Ioff is not safety-critical |
| 74ALVC244PW | Faster tpd (3.3 ns @ 3.3 V), higher drive (±24 mA), but narrower VCC range (1.65–3.6 V) and no Ioff | Optimized for high-speed 3.3 V-only designs; lacks power-down isolation for mixed-rail systems | Select 74ALVC244PW when maximum speed at 3.3 V is prioritized and full system power sequencing is guaranteed |
Compared with SN74LVC244APW and 74ALVC244PW, the SN74LV244APWR provides broader voltage flexibility (2–5.5 V), superior Ioff protection for industrial hot-swap use, and adequate speed for 100 MHz bus applications - making it the preferred choice where mixed-supply robustness and reliability outweigh peak frequency needs.
Availability
SN74LV244APWR is available at Aetrix Electronics and suitable for server backplanes, LED display modules, and telecom line cards requiring stable component supply, long-term industrial temperature support, and verified 3-state bus isolation.
Supply support for SN74LV244APWR 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 connectivity solutions for industrial, automotive, and communications markets.
The SN74LV244APWR belongs to TI's LV logic family, engineered for low-voltage operation with high noise immunity and robust bus-driving capability in space-constrained industrial and infrastructure equipment.
FAQ
What is the maximum recommended capacitive load for SN74LV244APWR?
The SN74LV244APWR is characterized and specified for loads ≤50 pF, as confirmed in Section 9.2.1 of the datasheet. Driving larger capacitances increases propagation delay and may degrade VOL/VOLP performance. While operation beyond 50 pF is possible, timing margins and signal integrity must be validated per application - the SN74LV244APWR datasheet specifies switching characteristics only up to 50 pF.
Does SN74LV244APWR support true bidirectional data flow?
No, the SN74LV244APWR is a unidirectional noninverting buffer: data flows only from A inputs to Y outputs. It does not contain internal direction control or bus transceiver logic. For bidirectional applications, separate transmit/receive buffers or a dedicated transceiver like the SN74LV245A must be used - the SN74LV244APWR functions strictly as an octal driver with 3-state outputs.
How should unused inputs be terminated on SN74LV244APWR?
All unused inputs on SN74LV244APWR must be tied to a valid logic level - either VCC or GND - to prevent floating states that cause excessive current draw and oscillation. A 10-kΩ pull-up or pull-down resistor is recommended per TI application note SCBA004. Leaving inputs unconnected violates the Recommended Operating Conditions and risks functional failure - this applies equally to all eight A inputs and both OE pins on the SN74LV244APWR.
Can SN74LV244APWR drive LEDs directly?
Yes, the SN74LV244APWR can drive LEDs directly with up to 16 mA per output at 4.5–5.5 V, as specified in Section 6.3 (IOL/IOH). This is sufficient for standard indicator LEDs and low-current display segments. However, current-limiting resistors must still be used in series with each LED to set forward current - the SN74LV244APWR provides drive strength but does not regulate current. Thermal limits and total ICC must also be observed per the Absolute Maximum Ratings.
Is the thermal pad on SN74LV244APWR (PW package) required to connect to GND?
No - the PW (TSSOP-20) package of SN74LV244APWR does not include an exposed thermal pad; that feature is specific to RKS/RGY VQFN variants. The PW package has standard copper leads only. Therefore, no thermal pad connection is present or required for SN74LV244APWR. PCB layout should follow standard TSSOP guidelines with adequate copper pour under the body for heat dissipation, but no pad tie-down is applicable to this SN74LV244APWR variant.
SN74LV244APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-TSSOP (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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LV244APWR FAQ
1.How can I place an order for SN74LV244APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244APWR 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 SN74LV244APWR reliable?
The price and inventory of SN74LV244APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244APWR is usually 5 days.
3.What payment methods are accepted for SN74LV244APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV244APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV244APWR?
SN74LV244APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244APWR 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 SN74LV244APWR?
For technical support, including SN74LV244APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244APWR requirements.
6.How does Aetrix verify that SN74LV244APWR is sourced from the original manufacturer or authorized distributors?
All SN74LV244APWR 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 SN74LV244APWR meets industry standards.
7.What is the process for return or replacement of SN74LV244APWR?
All SN74LV244APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244APWR, 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 SN74LV244APWR part is unused and in its original packaging.
Return procedure for SN74LV244APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LV244APWR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
