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Texas Instruments SN74LV244APWRE4
- Part No.:
- SN74LV244APWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV244APWRE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,304
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Product details
Overview
SN74LV244APWRE4 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 interfacing, and includes Ioff partial-power-down protection. It is used in server memory address buffering and telecom backplane signal isolation.
For engineers reviewing the SN74LV244APWRE4 datasheet, SN74LV244APWRE4 pinout, SN74LV244APWRE4 application, or SN74LV244APWRE4 equivalent, key selection criteria include VCC range compatibility (2–5.5 V), 3-state timing (tpd ≤6.5 ns @5 V), thermal performance in TSSOP-20 (RθJA = 128.2 °C/W), and Ioff-enabled power sequencing for hot-swap systems.
Technical Context
The SN74LV244APWRE4 implements two independent 4-bit noninverting buffer groups, each with dedicated OE control enabling selective channel gating. Its balanced CMOS 3-state outputs support symmetrical sourcing/sinking up to ±16 mA at 3.3 V and maintain high-impedance state during power-down via Ioff circuitry.
It uses standard CMOS inputs with ≤2.3 pF input capacitance and supports mixed-voltage operation-e.g., 3.3-V inputs driving 5-V outputs-without level-shifting components. The device meets JESD17 latch-up immunity (>250 mA) and withstands ±2000-V HBM ESD stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - Enables direct interface across 2.5-V, 3.3-V, and 5-V logic domains without external translators. |
| tpd (max) | 6.5 ns at VCC = 5 V, CL = 50 pF - Ensures sub-7-ns signal path delay for high-speed address/data buffering in memory subsystems. |
| Ioff Leakage | ≤5 µA at 0 V VCC - Prevents backfeeding and enables safe partial power-down in multi-rail systems. |
| Output Drive | ±16 mA at VCC = 4.5–5.5 V - Sustains robust drive into 50-pF loads while maintaining VOL ≤0.55 V and VOH ≥3.8 V. |
| Input Capacitance | 2.3 pF at VCC = 3.3 V - Minimizes capacitive loading on upstream drivers, preserving signal integrity on dense PCB traces. |
| ESD Rating | ±2000 V HBM - Meets industrial handling requirements without additional protection circuitry. |
| Operating Temp | –40°C to +125°C - Qualified for extended-temperature operation in telecom infrastructure and motor-drive control boards. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 7.8 mm body, 0.65-mm lead pitch, exposed pad optional (not electrically required). Pin 10 = GND, Pin 20 = VCC, thermal pad not connected by default per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input | Eight buffered data inputs grouped as two 4-bit channels; accept TTL- or CMOS-level signals across full VCC range. |
| 1Y1–1Y4, 2Y1–2Y4 | Output | Eight 3-state push-pull outputs; high-impedance when corresponding OE is high; drive up to ±16 mA. |
| 1OE, 2OE | Input | Active-low enable controls for each 4-bit group; must be pulled high via resistor during power-up to ensure defined Hi-Z state. |
| VCC (Pin 20) | Power | Single supply rail powering all logic and output stages; bypassing with 0.1-µF capacitor near pin is mandatory. |
| GND (Pin 10) | Reference | Common return path for all inputs, outputs, and internal circuitry; requires low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Allows 3.3-V inputs to safely drive 5-V outputs (or vice versa) without external level shifters-reducing BOM count and layout complexity. |
| Ioff partial-power-down | Disables all outputs and limits leakage to ≤5 µA when VCC = 0 V-enabling hot-plug capability in modular server and network switch designs. |
| Balanced 3-state outputs | Sources and sinks up to ±16 mA symmetrically, ensuring consistent rise/fall times and minimizing ground bounce (<0.8 V) and VOH undershoot (>2.3 V). |
| Low dynamic ground bounce | VOLP < 0.8 V at 3.3 V ensures stable reference for downstream receivers during simultaneous switching of multiple outputs. |
| JESD17 latch-up immunity | Exceeds 250 mA-guarantees robustness against transient current faults in industrial motor-control environments. |
Applications
| Server Memory Address Buffering | Telecom Backplane Signal Isolation |
|---|---|
Use Scenario: Buffering CPU-generated memory address lines before distribution to multiple DDR modules on a high-density server motherboard. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing fanout gain and timing margin; OE pins synchronized to memory controller clock enable signals. Use Value: Delivers ≤6.5 ns tpd at 5 V to meet tight setup/hold windows, while Ioff prevents address bus corruption during module hot-swap events. | Use Scenario: Isolating control signals between line cards and switch fabric in carrier-grade Ethernet switches operating at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling signal direction control via OE; supports mixed 3.3-V/5-V signaling across card-edge connectors. Use Value: Mixed-voltage operation eliminates discrete level shifters; ±2000-V HBM rating ensures reliability in field-replaceable unit (FRU) handling. |
| LED Display Column Driver | Motor-Drive Control Logic Interface |
Use Scenario: Driving common-anode LED column segments in outdoor signage requiring 16-mA per segment current at 5 V. IC Role / Device Role / Timing Role: High-current sink driver with 3-state disable for multiplexed scanning; outputs directly interface LED cathodes. Use Value: ±16 mA drive capability eliminates external transistor stages; VOL ≤0.55 V at 16 mA ensures >4.4 V forward bias across LEDs for full brightness. | Use Scenario: Interfacing microcontroller PWM outputs to isolated gate drivers in industrial servo inverters. IC Role / Device Role / Timing Role: Signal conditioner isolating MCU logic from noisy power stage; OE used for fault-induced shutdown. Use Value: 125°C max operating temperature matches motor-drive ambient; Ioff prevents gate driver misfire during MCU reset 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 |
|---|---|---|---|
| SN74LVC244APWRE4 | Lower VCC min (1.65 V), higher speed (tpd ≤5.1 ns @3.3 V), but reduced Ioff leakage (≤10 µA vs. ≤5 µA) and no 5-V absolute max rating. | Better suited for 1.8-V/3.3-V only systems; not rated for 5-V bus operation. | Select when operating exclusively below 3.6 V and requiring tighter timing margins. |
| 74LVX244M | Same 2–3.6 V VCC range, identical pinout, but lower drive (±12 mA) and no Ioff support; obsolete per ON Semiconductor lifecycle notice. | Lacks partial-power-down capability-unsuitable for hot-swap or multi-rail sequencing. | Only consider for legacy redesign where Ioff is not required and 5-V tolerance is unnecessary. |
Compared with SN74LVC244APWRE4 and 74LVX244M, the SN74LV244APWRE4 uniquely combines 5.5-V tolerance, verified Ioff behavior, and industrial temperature range-making it the sole choice for mixed-voltage, hot-pluggable, or 5-V bus-coupled applications.
Availability
SN74LV244APWRE4 is available at Aetrix Electronics and suitable for server motherboard design, telecom infrastructure equipment, and industrial motor-drive control boards requiring stable component supply across extended temperature and voltage ranges.
Supply support for SN74LV244APWRE4 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74LV244APWRE4 belongs to TI's LV logic family-designed specifically to improve density and performance of 3-state memory address drivers, clock buffers, and bus-oriented transceivers in space-constrained, mixed-voltage systems.
FAQ
What is the maximum propagation delay of the SN74LV244APWRE4 at 5 V?
The SN74LV244APWRE4 has a maximum propagation delay (tpd) of 6.5 ns when operating at VCC = 5 V with a 50-pF load, as specified in Section 6.10 of the official datasheet. This value applies across the full operating temperature range (–40°C to +125°C) and ensures timing compliance in high-speed memory and address buffering applications. The SN74LV244APWRE4 achieves this performance using optimized LV-CMOS process technology.
Does the SN74LV244APWRE4 support partial power-down mode?
Yes, the SN74LV244APWRE4 supports partial power-down mode via its Ioff feature. When VCC is at 0 V, all outputs enter high-impedance state and input/output leakage is limited to ≤5 µA, preventing current backflow into powered sections of the system. This capability is explicitly validated in Section 6.5 (Electrical Characteristics) and enables safe hot-swap operation in modular server and telecom equipment using the SN74LV244APWRE4.
What package type is used for the SN74LV244APWRE4?
The SN74LV244APWRE4 uses a TSSOP-20 (PW) package measuring 6.50 mm × 7.8 mm with 0.65-mm lead pitch. This surface-mount package is RoHS-compliant and features a standard footprint compatible with automated assembly. The thermal pad is optional and may be left floating or connected to GND per design requirements-no electrical connection is mandated, as confirmed in Table 5-1 and Package Information section of the SN74LV244APWRE4 datasheet.
Can the SN74LV244APWRE4 interface between 3.3-V and 5-V logic domains?
Yes, the SN74LV244APWRE4 supports mixed-mode voltage operation: inputs can tolerate voltages up to 5.5 V regardless of VCC, and outputs swing rail-to-rail within the applied VCC range. This allows 3.3-V controllers to safely drive the SN74LV244APWRE4 inputs while the device outputs 5-V logic levels when powered at 5 V-eliminating need for external level shifters in cross-domain bus interfaces.
What is the recommended bypass capacitor for the SN74LV244APWRE4?
Texas Instruments recommends a 0.1-µF ceramic bypass capacitor placed as close as possible to the VCC (Pin 20) and GND (Pin 10) pins of the SN74LV244APWRE4. This minimizes high-frequency supply noise and stabilizes internal logic during output switching transients. For systems with multiple power domains or stringent EMI requirements, paralleling a 1-µF capacitor is acceptable-but the 0.1-µF unit remains mandatory per Section 9.3 of the SN74LV244APWRE4 datasheet.
SN74LV244APWRE4 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:
- Discontinued at Digi-Key
- 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
SN74LV244APWRE4 FAQ
1.How can I place an order for SN74LV244APWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244APWRE4 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 SN74LV244APWRE4 reliable?
The price and inventory of SN74LV244APWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244APWRE4 is usually 5 days.
3.What payment methods are accepted for SN74LV244APWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV244APWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV244APWRE4?
SN74LV244APWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244APWRE4 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 SN74LV244APWRE4?
For technical support, including SN74LV244APWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244APWRE4 requirements.
6.How does Aetrix verify that SN74LV244APWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LV244APWRE4 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 SN74LV244APWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LV244APWRE4?
All SN74LV244APWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244APWRE4, 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 SN74LV244APWRE4 part is unused and in its original packaging.
Return procedure for SN74LV244APWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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