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Texas Instruments SN74HC244N
- Part No.:
- SN74HC244N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HC244N.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,286
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Product details
Overview
SN74HC244N from Texas Instruments is an octal noninverting 3-state buffer/line driver IC used for bus interfacing, memory address driving, and signal isolation 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 SN74HC244N datasheet, SN74HC244N pinout, SN74HC244N application, or SN74HC244N equivalent, key selection criteria include 3-state output control per bank, dual 4-bit independent enable architecture, high-current CMOS drive capability, and PDIP-20 package compatibility with legacy through-hole layouts.
Technical Context
The SN74HC244N implements two independent 4-bit buffer banks, each controlled by a dedicated active-low output-enable (OE) input. Each bank passes noninverted logic from A inputs to Y outputs when its OE is low; outputs enter high-impedance state when OE is high. This architecture enables bidirectional bus management without contention.
It uses standard CMOS inputs with ≤1µA max input current and 10pF typical input capacitance, requiring defined VIH/VIL thresholds (e.g., VIH ≥ 3.15V at VCC = 4.5V) and fast input transitions (≤500 ns/V at 4.5V) to avoid oscillation or excess power draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing (e.g., 3.3V MCU to 5V peripheral bus) |
| Output Drive Current | ±6mA at 5V - drives up to 15 LSTTL loads, enabling direct connection to legacy TTL buses |
| Propagation Delay (tpd) | 11ns typical (VCC = 6V, CL = 50pF) - suitable for high-speed data paths up to ~45 MHz clock domains |
| Quiescent Current (ICC) | 8µA max at 25°C, 80µA max over full temp - enables low-power standby in battery-backed I/O expanders |
| 3-State Leakage (IOZ) | ±0.5µA max at VCC = 6V - ensures minimal bus leakage during disable, critical for multi-driver shared-bus integrity |
| Input Voltage Thresholds | VIH = 3.15V min, VIL = 1.35V max at VCC = 4.5V - compatible with 3.3V CMOS logic levels with margin |
| Operating Temperature | –40°C to +125°C - qualified for industrial and extended-temperature embedded control applications |
Pinout & Package
SN74HC244N is supplied in a 20-pin plastic dual in-line package (PDIP-20) with 0.300-inch body width and through-hole mounting. Pin pitch is 0.100 inch; pin 1 is marked by a notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs - independently control high-impedance state of 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 noninverting replica of 1A1–1A4 |
| 9,7,5,3 | 2Y1–2Y4 | Bank 2 buffered outputs - high-impedance when 2OE = H; otherwise noninverting replica of 2A1–2A4 |
| 10 | GND | Ground reference - must be connected to system common ground plane for stable noise margin and switching performance |
| 20 | VCC | Positive supply - requires local 0.1µF ceramic bypass capacitor placed within 5mm of pin for clean power delivery |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit banks | Enables selective bus isolation - e.g., disable memory address lines while keeping data lines active |
| High-current CMOS outputs | ±6mA drive at 5V eliminates need for external line drivers in moderate-load applications |
| Low quiescent power | 8µA ICC max at 25°C reduces system-level standby power in always-on I/O expander modules |
| Wide voltage operation (2–6V) | Supports interoperability across 2.5V, 3.3V, and 5V logic families without level shifters |
| 3-state output control | Prevents bus contention in multi-driver systems - essential for shared address/data buses in microcontroller peripherals |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from expansion slot peripherals in rack-mounted servers. IC Role / Device Role / Timing Role: Octal buffer provides load isolation and fanout enhancement between processor and PCIe/PCI add-in cards. Use Value: ±6mA drive sustains signal integrity across 10+ inch backplane traces; 3-state control prevents contention during hot-plug events. |
Use Scenario: Driving 8-column segments of a 16×16 multiplexed LED matrix in industrial HMIs. IC Role / Device Role / Timing Role: Noninverting buffer translates microcontroller GPIO outputs to higher-current column sink drivers. Use Value: 11ns tpd enables >1kHz refresh rates; dual OE pins allow synchronized blanking of upper/lower display halves. |
| Industrial Network Switch PHY Interface | Motor Control I/O Expander |
|
Use Scenario: Level-shifting and buffering between 3.3V switch ASIC and 5V legacy Ethernet PHY transceivers. IC Role / Device Role / Timing Role: Voltage-tolerant buffer interfaces mismatched logic families on MII/RMII control lines. Use Value: 2V–6V operation accommodates both 3.3V ASIC core and 5V PHY I/O; VIH/VIL margins ensure noise immunity in noisy plant environments. |
Use Scenario: Extending GPIO count of a PLC controller to manage 8 discrete motor enable/brake signals. IC Role / Device Role / Timing Role: 3-state buffer isolates motor driver inputs from main controller during fault shutdown sequences. Use Value: Independent OE control allows safe sequencing - disable motor outputs before cutting main power; IOZ < 0.5µA prevents unintended activation. |
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 = 2.0V min at VCC = 4.5V); identical output drive and timing | Better suited for interfacing with legacy 5V TTL logic where HC thresholds may cause marginal switching | Select when driving from 5V TTL sources; retains same PDIP-20 footprint and pinout |
| 74LCX244N | Lower VCC range (2.0–3.6V), higher speed (tpd = 5.5ns typ at 3.3V), but reduced drive (±24mA) | Optimized for 3.3V-only systems with tighter timing budgets; not 5V-tolerant | Choose for modern low-voltage designs requiring sub-6ns propagation; verify 3.3V-only supply compliance |
Compared with SN74HC244N, SN74HCT244N offers guaranteed TTL input compatibility at 5V while maintaining identical output behavior, whereas 74LCX244N trades 5V operation for faster 3.3V performance - making SN74HC244N the optimal general-purpose choice for mixed-voltage industrial interfaces.
Availability
SN74HC244N is available at Aetrix Electronics and suitable for server backplane design, LED display controller development, and industrial network switch manufacturing requiring stable component supply and long-term obsolescence management.
Supply support for SN74HC244N 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 decades of expertise in high-reliability logic families.
The SN74HC244N belongs to TI's industry-standard 74HC logic series, designed for robust, low-power, wide-voltage digital interfacing in industrial, computing, and communications equipment.
FAQ
What is the maximum operating temperature for SN74HC244N?
The SN74HC244N is rated for operation from –40°C to +125°C. This extended temperature range is confirmed in Section 5.3 (Recommended Operating Conditions) of the official Texas Instruments datasheet SCLS130I, revision February 2026, and qualifies the device for use in demanding industrial and automotive under-hood applications where thermal stability is critical. The SN74HC244N maintains full electrical specifications across this entire range.
Does SN74HC244N support 3.3V logic levels?
Yes, SN74HC244N fully supports 3.3V operation. Its supply voltage range is 2V to 6V, and input thresholds (VIH = 2.31V min, VIL = 0.99V max at VCC = 3.3V) provide solid noise margins for 3.3V CMOS systems. Output VOH/VOL values meet 3.3V logic requirements, and the device delivers ±6mA drive at 3.3V - making SN74HC244N suitable for 3.3V bus buffering without level translation.
How are the two output-enable (OE) pins used in SN74HC244N?
The SN74HC244N has two independent active-low output-enable pins: 1OE (Pin 1) controls Bank 1 outputs (1Y1–1Y4), and 2OE (Pin 19) controls Bank 2 outputs (2Y1–2Y4). When an OE pin is low, its associated four outputs pass noninverted inputs; when high, those outputs go high-impedance. This allows independent bus segmentation - for example, isolating address vs. data lines or upper vs. lower display sections - without external logic.
Can SN74HC244N drive LEDs directly?
SN74HC244N can drive low-current LEDs (≤6mA per output) in sink configuration using its 1Y/2Y outputs, provided VCC = 5V and series resistors limit current appropriately. However, it is not optimized for continuous LED current handling - thermal limits and cumulative ICC rise make dedicated LED drivers preferable for high-duty-cycle or multi-LED applications. For indicator use with pulsed or low-duty signals, SN74HC244N is viable and widely implemented.
What decoupling capacitor is recommended for SN74HC244N?
A 0.1µF ceramic capacitor is recommended for SN74HC244N, placed as close as possible (≤5mm) to the VCC (Pin 20) and GND (Pin 10) pins. TI's layout guidelines (Section 8.3–8.4) specify this value to suppress high-frequency switching noise and maintain stable rail voltage during output transitions. For systems with heavy simultaneous switching, paralleling a 1µF capacitor is acceptable - but the 0.1µF must remain the primary, nearest-capacitor for SN74HC244N.
SN74HC244N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74HC244N FAQ
1.How can I place an order for SN74HC244N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC244N 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 SN74HC244N reliable?
The price and inventory of SN74HC244N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244N is usually 5 days.
3.What payment methods are accepted for SN74HC244N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC244N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC244N?
SN74HC244N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC244N 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 SN74HC244N?
For technical support, including SN74HC244N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244N requirements.
6.How does Aetrix verify that SN74HC244N is sourced from the original manufacturer or authorized distributors?
All SN74HC244N 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 SN74HC244N meets industry standards.
7.What is the process for return or replacement of SN74HC244N?
All SN74HC244N units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244N, 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 SN74HC244N part is unused and in its original packaging.
Return procedure for SN74HC244N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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