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Texas Instruments SN74HC244DW
- Part No.:
- SN74HC244DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC244DW.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,319
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Product details
Overview
SN74HC244DW from Texas Instruments is an octal noninverting 3-state buffer/line driver IC used for bus interfacing, memory address driving, and clock distribution in digital systems. It operates from 2V to 6V, delivers ±6mA output drive at 5V, exhibits typical propagation delay of 11ns (VCC = 6V, CL = 50pF), and supports industrial temperature range (–40°C to 125°C). It is commonly deployed in server backplanes and LED display controllers.
For engineers reviewing the SN74HC244DW datasheet, SN74HC244DW pinout, SN74HC244DW application, or SN74HC244DW equivalent, key selection criteria include 3-state output control per bank, SOIC-20 package compatibility, low ICC (≤80µA max), high-current drive capability, and CMOS input compatibility with LSTTL loads.
Technical Context
The SN74HC244DW implements two independent 4-bit buffer banks, each controlled by a dedicated output-enable (OE) input. When OE is low, the corresponding Y outputs replicate A inputs with noninverted logic; when OE is high, all four outputs enter high-impedance state-enabling bidirectional bus sharing without contention.
Its CMOS architecture ensures low static power consumption and rail-to-rail output swing, while its balanced output drive (±6mA at 5V) supports reliable signal integrity across PCB traces up to 12cm. Input transition rate requirements (e.g., 400 ns/V at VCC = 6V) mandate fast edge rates to prevent oscillation or excessive current draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - enables direct interface with 3.3V and 5V logic families without level shifters. |
| Output Drive Current | ±6mA at 5V - drives up to 15 LSTTL loads, sufficient for fanout into multiple downstream gates or LEDs. |
| Propagation Delay (tpd) | 11ns typical (VCC = 6V, CL = 50pF) - supports >30MHz bus operation in high-speed digital interfaces. |
| Quiescent Supply Current (ICC) | 80µA maximum - ensures minimal standby power in battery-sensitive or thermally constrained applications. |
| Input Leakage Current | ±1µA maximum - allows reliable pull-up/pull-down biasing without significant voltage drop or power loss. |
| 3-State Enable/Disable Time | 13ns typical (ten/tdis, VCC = 6V, CL = 50pF) - enables rapid bus arbitration and dynamic resource sharing. |
| Operating Temperature | –40°C to 125°C - qualified for industrial and extended-temperature embedded systems including telecom infrastructure. |
Pinout & Package
SN74HC244DW is housed in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm (body: 12.8mm × 7.5mm), with standard 1.27mm pitch and gull-wing leads suitable for automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable inputs - independently control high-impedance state for 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; otherwise noninverted replica of 1A1–1A4. |
| 9,7,5,3 | 2Y1–2Y4 | Bank 2 buffered outputs - high-impedance when 2OE = H; otherwise noninverted replica of 2A1–2A4. |
| 10 | GND | Ground reference - must be connected to system common ground plane for stable logic thresholds and noise immunity. |
| 20 | VCC | Positive supply - requires local 0.1µF ceramic bypass capacitor placed adjacent to pin for transient current delivery. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-bank 3-state control | Enables time-multiplexed bus access between two subsystems (e.g., MCU and FPGA) without external arbitration logic. |
| Rail-to-rail CMOS output swing | Ensures full logic-level compatibility with both HC/HCT and LSTTL families across 2V–6V supply range. |
| Low input capacitance (≤10pF) | Minimizes loading on upstream drivers and preserves signal edge rates in high-frequency routing. |
| ESD protection (HBM ±2000V) | Meets industrial handling requirements without additional external protection components. |
| Thermal resistance (RθJA = 109.1°C/W) | Supports continuous operation at full drive strength in ambient temperatures up to 85°C without forced airflow. |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
Use Scenario: Isolating and buffering address/data lines between CPU and memory modules on multi-slot server motherboards. IC Role / Device Role / Timing Role: Octal buffer providing load isolation and signal integrity restoration across long PCB traces with impedance mismatch. Use Value: Prevents signal degradation and timing skew across 10+ inch backplane runs while enabling hot-swap-safe 3-state control during module insertion/removal. | Use Scenario: Driving column segments of 16×32 multiplexed LED matrix displays in industrial HMIs. IC Role / Device Role / Timing Role: High-current line driver translating microcontroller GPIO outputs to 6mA sink/source per segment for uniform brightness. Use Value: Eliminates need for discrete transistor arrays; reduces BOM count and layout area while maintaining consistent segment current across all 8 columns. |
| Network Switch Control Plane | Industrial I/O Expander Interface |
Use Scenario: Buffering configuration signals (reset, clock enable, mode select) between management MCU and ASIC-based switch fabric. IC Role / Device Role / Timing Role: Noninverting 3-state buffer ensuring glitch-free signal handoff during firmware updates or failover events. Use Value: Enables safe reconfiguration of switch ASICs without disrupting active data-plane traffic via precise OE-controlled bus isolation. | Use Scenario: Interfacing 8-bit parallel GPIO expansion ports (e.g., MCP23008) to main controller in PLC I/O modules. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer supporting mixed-voltage domains (3.3V MCU ↔ 5V sensor interface). Use Value: Provides robust noise margin and drive strength for industrial sensors operating in electrically noisy environments, reducing false triggers and communication errors. |
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 inputs (VIH = 2V min); identical SOIC-20 pinout and function. | Better interoperability with legacy 5V TTL logic; slightly higher ICC (160µA max). | Select when interfacing with older 74LS/74ALS devices where input threshold matching is critical. |
| 74LCX244MTCX | Lower VCC range (2.0–3.6V); 3.3V-only optimized; 5V-tolerant inputs; 20-pin TSSOP only. | Designed for low-voltage portable/embedded systems; not suitable for 5V operation. | Choose for space-constrained 3.3V designs requiring lower dynamic power and smaller footprint than SOIC. |
Compared with SN74HCT244N and 74LCX244MTCX, the SN74HC244DW offers broader supply flexibility (2–6V), superior noise immunity in mixed-voltage systems, and proven thermal performance in SOIC packaging-making it optimal for industrial-grade bus isolation where voltage agility and reliability outweigh ultra-low-power or ultra-small-size requirements.
Availability
SN74HC244DW is available at Aetrix Electronics and suitable for server backplanes, LED display controllers, and network switch control planes requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74HC244DW 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 and embedded processing solutions for industrial, automotive, and communications markets.
The SN74HC244DW belongs to TI's industry-standard 74HC logic family, designed for high-speed, low-power digital interfacing in systems demanding robust noise immunity, wide supply tolerance, and seamless integration with legacy and modern logic families.
FAQ
What is the maximum operating temperature for SN74HC244DW?
The SN74HC244DW is rated for operation from –40°C to +125°C ambient temperature, making it suitable for industrial and extended-temperature applications such as telecom infrastructure and motor control systems. This rating is confirmed in Section 5.3 of the official datasheet and supersedes earlier versions specifying only 85°C maximum.
Can SN74HC244DW drive LSTTL loads directly?
Yes, the SN74HC244DW can drive up to 15 LSTTL loads per output due to its ±6mA drive capability at 5V, as specified in the Features section and Electrical Characteristics table. This eliminates the need for additional buffer stages when interfacing with legacy TTL-based peripherals or memory chips.
How should unused inputs be handled on SN74HC244DW?
All unused inputs on SN74HC244DW must be tied to either VCC or GND to prevent floating states that cause excessive current draw or oscillation. TI recommends 10kΩ pull-up or pull-down resistors for unconnected inputs, as detailed in Section 7.3.1 and the Implications of Slow or Floating CMOS Inputs application note.
Does SN74HC244DW require external bypass capacitors?
Yes, SN74HC244DW requires a 0.1µF ceramic bypass capacitor placed as close as possible to the VCC pin (pin 20) and GND (pin 10) to suppress supply transients caused by fast switching. This is explicitly recommended in Section 8.3 and Figure 8-4 of the datasheet for stable operation.
Is SN74HC244DW pin-compatible with other 74HC244 variants?
Yes, SN74HC244DW shares identical pinout and functionality with all 20-pin 74HC244 variants-including SN74HC244N (PDIP), SN74HC244DB (SSOP), and SN74HC244PW (TSSOP)-as confirmed by the Pin Configuration and Functions section and mechanical drawings in the datasheet.
SN74HC244DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 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
SN74HC244DW FAQ
1.How can I place an order for SN74HC244DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC244DW 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 SN74HC244DW reliable?
The price and inventory of SN74HC244DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244DW is usually 5 days.
3.What payment methods are accepted for SN74HC244DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC244DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC244DW?
SN74HC244DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC244DW 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 SN74HC244DW?
For technical support, including SN74HC244DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244DW requirements.
6.How does Aetrix verify that SN74HC244DW is sourced from the original manufacturer or authorized distributors?
All SN74HC244DW 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 SN74HC244DW meets industry standards.
7.What is the process for return or replacement of SN74HC244DW?
All SN74HC244DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244DW, 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 SN74HC244DW part is unused and in its original packaging.
Return procedure for SN74HC244DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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