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Texas Instruments SN74HC244DWG4
- Part No.:
- SN74HC244DWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC244DWG4.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,600
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Product details
Overview
SN74HC244DWG4 from Texas Instruments is an octal noninverting 3-state buffer/line driver IC organized as two independent 4-bit banks, operating from 2V to 6V supply, delivering ±6mA output drive at 5V, with typical propagation delay of 11ns (VCC = 6V, CL = 50pF), and low quiescent current (ICC ≤ 80µA max) - used for bus interfacing, memory address buffering, and I/O expansion in industrial control systems.
For engineers reviewing the SN74HC244DWG4 datasheet, SN74HC244DWG4 pinout, SN74HC244DWG4 application, or SN74HC244DWG4 equivalent, key selection criteria include 3-state output enable timing (ten/tdis ≤ 26ns at VCC = 6V), high-impedance leakage (IOZ ≤ 0.5µA at VCC = 6V), input voltage thresholds (VIH ≥ 3.15V at VCC = 4.5V), and SOIC-20 package thermal resistance (RθJA = 109.1°C/W).
Technical Context
The SN74HC244DWG4 implements two independent 4-bit noninverting buffer banks, each controlled by a dedicated active-low output-enable (OE) input. Its CMOS architecture ensures rail-to-rail logic compatibility across 2V–6V operation while maintaining low static power consumption and fast edge rates.
Each bank's outputs enter high-impedance state when its OE is high; no inversion occurs during data pass-through. Input transition rate limits (Δt/Δv = 400 ns/V at VCC = 6V) and mandatory termination of unused inputs prevent oscillation and excessive ICC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2V to 6V - supports mixed-voltage system interfacing (e.g., 3.3V MCU to 5V peripheral bus) |
| Output Drive | ±6mA at 5V - drives 15 LSTTL loads directly without external buffers |
| Propagation Delay | 11ns typical (VCC = 6V, CL = 50pF) - enables reliable operation up to ~45MHz bus clocking |
| Quiescent Current | 80µA maximum - suitable for low-power standby modes in battery-backed systems |
| Input Leakage | ±100nA max (TA = 25°C) - prevents unintended logic transitions on unterminated lines |
| 3-State Leakage | ±0.5µA max (VCC = 6V) - minimizes bus contention current when outputs are disabled |
| Operating Temperature | –40°C to +125°C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
SN74HC244DWG4 is housed in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm, with 7.5mm body width and standard 0.050″ lead pitch. Thermal resistance is RθJA = 109.1°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls Bank 1 (pins 2,4,6,8 → 18,16,14,12) and Bank 2 (pins 11,13,15,17 → 9,7,5,3) |
| 2,4,6,8 | 1A1–1A4 | Bank 1 input signals - routed directly to corresponding Y outputs when 1OE = L |
| 11,13,15,17 | 2A1–2A4 | Bank 2 input signals - routed directly to corresponding Y outputs when 2OE = L |
| 18,16,14,12 | 1Y1–1Y4 | Bank 1 buffered outputs - high-impedance when 1OE = H |
| 9,7,5,3 | 2Y1–2Y4 | Bank 2 buffered outputs - high-impedance when 2OE = H |
| 10, 20 | GND, VCC | Power reference and supply - requires local 0.1µF bypass capacitor per supply pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2V–6V operation enables interoperability between 3.3V and 5V logic domains without level shifters |
| High-Current Outputs | ±6mA drive at 5V eliminates need for discrete buffer stages in medium-load bus applications |
| Low-Power CMOS | ICC ≤ 80µA max ensures minimal contribution to system standby power budget |
| Controlled Output Enable Timing | ten/tdis ≤ 26ns (VCC = 6V) guarantees clean bus arbitration without glitches during enable/disable transitions |
| ESD Robustness | ±2000V HBM rating protects against handling damage in automated assembly and field service |
Applications
| Server Backplane Interfacing | Industrial I/O Expansion |
|---|---|
Use Scenario: Isolating and driving address/data buses between CPU module and hot-swap PCIe carrier boards. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling controlled bus access during card insertion/removal. Use Value: Prevents bus contention during hot-swap events using independent OE control per bank and <26ns enable/disable timing. | Use Scenario: Extending GPIO count of PLC main controller to interface with 24V sensor inputs and relay outputs. IC Role / Device Role / Timing Role: Level-translating and current-boosting buffer between 3.3V microcontroller and industrial field-side circuitry. Use Value: ±6mA drive capability directly sources/sinks PLC input LED indicators and relay coils without external transistors. |
| LED Display Column Drivers | Telecom Line Card Buffers |
Use Scenario: Driving multiplexed 8×8 LED matrix columns where each column requires simultaneous 8-bit data latching. IC Role / Device Role / Timing Role: Noninverting octal buffer providing parallel data path from shift register to LED cathodes. Use Value: 11ns typical tpd ensures precise column refresh timing synchronization across full display rows. | Use Scenario: Buffering control signals (reset, interrupt, clock enable) between baseband processor and FPGA-based packet processing engine. IC Role / Device Role / Timing Role: Noise-immune signal repeater isolating sensitive FPGA pins from noisy backplane traces. Use Value: Low input capacitance (Ci ≤ 10pF) and high VIH threshold (≥3.15V at 4.5V) reject EMI-induced false triggers. |
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 |
|---|---|---|---|
| SN74HCT244N | TTL-compatible input thresholds (VIH = 2V min), higher ICC (≤4µA typ), same SOIC-20 package | Better suited for legacy 5V TTL system integration where input noise margin must match older logic families | Select when interfacing with 74LS/74ALS devices requiring guaranteed recognition of 2V input highs |
| 74LCX244MTCX | Lower VCC range (2.0V–3.6V), higher speed (tpd = 5.5ns @ 3.3V), TSSOP-20 package (6.5mm × 6.4mm) | Optimized for compact, low-voltage embedded designs where PCB space and 3.3V-only operation are constraints | Select for space-constrained 3.3V applications needing sub-6ns propagation delay and reduced thermal footprint |
Compared with SN74HC244DWG4, SN74HCT244N offers superior noise immunity in mixed-logic systems but consumes more static power, while 74LCX244MTCX delivers faster switching in 3.3V domains at the cost of reduced voltage flexibility and smaller package thermal mass.
Availability
SN74HC244DWG4 is available at Aetrix Electronics and suitable for server backplanes, industrial PLC I/O modules, and telecom line cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HC244DWG4 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 industrial, automotive, and communications markets.
The SN74HC244DWG4 belongs to TI's HC logic family, designed for high-density, low-power bus interfacing in systems demanding robust 3-state control, wide supply tolerance, and industrial-grade reliability.
FAQ
What is the maximum recommended operating voltage for SN74HC244DWG4?
The absolute maximum supply voltage for SN74HC244DWG4 is 7V, but the recommended operating range is 2V to 6V per TI's SCLS130I datasheet. Operation above 6V risks parametric degradation and reduced reliability; sustained use at 6.5V or higher is not advised even if within absolute ratings.
Does SN74HC244DWG4 support hot-swap bus isolation?
Yes, SN74HC244DWG4 supports hot-swap isolation via its dual independent 3-state enable inputs (1OE and 2OE). When either OE is held high, its associated four outputs enter high-impedance state with leakage ≤0.5µA, preventing bus contention during live insertion - provided OE is asserted before power stabilization per TI layout guidelines.
What is the typical propagation delay of SN74HC244DWG4 at 3.3V supply?
At VCC = 3.3V and CL = 50pF, the typical propagation delay (tpd) of SN74HC244DWG4 is 18ns, as interpolated from the datasheet's Figure 5-1 and Table 5.10. This value falls between the 2V (115ns) and 4.5V (23ns) published typicals, confirming usable performance in 3.3V systems despite being optimized for 4.5V–6V operation.
How should unused inputs be handled on SN74HC244DWG4?
All unused inputs on SN74HC244DWG4 must be tied to VCC or GND - floating CMOS inputs cause excessive ICC, oscillation, and potential device latch-up. TI explicitly states this in Section 5.3 and the Implications of Slow or Floating CMOS Inputs application note; 10kΩ pull-up/down resistors are recommended for un-driven control lines.
Is SN74HC244DWG4 RoHS compliant and lead-free?
Yes, SN74HC244DWG4 is RoHS compliant and lead-free. Per TI's Packaging Information addendum, the DW package uses lead-free matte tin (Sn) lead finish, complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 1, and meets IPC/JEDEC J-STD-020 reflow profile requirements for Pb-free assembly.
SN74HC244DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HC244DWG4 FAQ
1.How can I place an order for SN74HC244DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC244DWG4 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 SN74HC244DWG4 reliable?
The price and inventory of SN74HC244DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244DWG4 is usually 5 days.
3.What payment methods are accepted for SN74HC244DWG4?
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4.How is shipping managed for SN74HC244DWG4?
SN74HC244DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC244DWG4 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 SN74HC244DWG4?
For technical support, including SN74HC244DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244DWG4 requirements.
6.How does Aetrix verify that SN74HC244DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC244DWG4 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 SN74HC244DWG4 meets industry standards.
7.What is the process for return or replacement of SN74HC244DWG4?
All SN74HC244DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244DWG4, 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 SN74HC244DWG4 part is unused and in its original packaging.
Return procedure for SN74HC244DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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