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Texas Instruments SN74HC244ANSR
- Part No.:
- SN74HC244ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC244ANSR.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,716
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Product details
Overview
SN74HC244ANSR from Texas Instruments is an octal noninverting 3-state buffer/line driver IC, organized as two independent 4-bit banks with separate output-enable (OE) controls. It operates from 2V to 6V, delivers ±6mA output drive at 5V, exhibits typical propagation delay of 11ns (VCC = 6V, CL = 50pF), and consumes ≤80µA ICC (max). It is used in bus interfacing between microcontrollers and high-capacitance loads such as LED display segments or memory address lines.
For engineers reviewing the SN74HC244ANSR datasheet, SN74HC244ANSR pinout, SN74HC244ANSR application, or SN74HC244ANSR equivalent, key selection criteria include its dual-bank 3-state architecture, wide VCC range, low quiescent current, high-output-drive capability, and compatibility with LSTTL load levels in industrial and telecom infrastructure designs.
Technical Context
The SN74HC244ANSR implements two independent 4-bit noninverting buffer banks, each controlled by a dedicated OE input. When OE is low, the corresponding Y outputs replicate A inputs; when OE is high, all four outputs enter high-impedance state-enabling bidirectional bus sharing without contention.
It uses standard CMOS inputs with ≤1µA max input current and 35pF typical power-dissipation capacitance per buffer. Its switching performance is specified across –40°C to 125°C, with tpd as low as 11ns (6V, 50pF) and enable/disable times (ten/tdis) down to 13ns under same conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports mixed-voltage system interfacing (e.g., 3.3V MCU to 5V peripheral bus) |
| Output Drive | ±6mA at 5V - drives up to 15 LSTTL loads directly, eliminating need for external level-shifting buffers |
| tpd (Typical) | 11ns @ VCC = 6V, CL = 50pF - enables reliable operation in high-speed address/data bus applications up to ~45MHz |
| ICC (Max) | 80µA @ VCC = 6V, TA = 25°C - ensures ultra-low static power in always-on control logic or I/O expander subsystems |
| Input Current | ≤1µA (max) - minimizes loading on upstream logic and enables use with high-impedance signal sources |
| 3-State Leakage | ±0.5µA IOZ @ VCC = 6V - maintains clean bus isolation during disable, critical for multi-driver shared-bus reliability |
Pinout & Package
SN74HC244ANSR is supplied in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm (body: 12.8mm × 7.5mm), RoHS-compliant, with standard gull-wing leads and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19OE | Bank 1 & Bank 2 Output Enable (active-low) | Independent control of 4-bit output groups; tie high via pull-up to ensure high-Z at power-up |
| 1A1–1A4, 2A1–2A4 | Buffer Inputs (8 total) | CMOS-compatible inputs accepting 2V–6V logic; must not float - terminate to VCC/GND if unused |
| 1Y1–1Y4, 2Y1–2Y4 | Noninverting 3-State Outputs (8 total) | Drive bus lines or address registers; high-Z state prevents contention when multiple drivers share same net |
| VCC (Pin 20), GND (Pin 10) | Power Supply | Requires local 0.1µF ceramic bypass capacitor placed adjacent to VCC pin to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit banks | Enables selective bus buffering - e.g., isolate address vs. data paths using separate OE signals |
| 3-state outputs with fast enable/disable | ten/tdis ≤13ns @ 6V - supports dynamic bus arbitration in real-time systems without timing glitches |
| High-output current (±6mA @ 5V) | Drives long PCB traces or multiple LSTTL inputs without external amplification, reducing BOM count |
| Low ICC (80µA max) | Reduces system-level standby power in battery-backed I/O expanders or always-on monitoring circuits |
| Wide temperature range (–40°C to 125°C) | Validated for deployment in industrial motor drives and telecom base station control modules |
Applications
| LED Display Driver | Memory Address Buffer |
|---|---|
|
Use Scenario: Driving common-anode 7-segment LED displays with multiplexed digit scanning. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state outputs isolates segment drivers during digit blanking; OE synchronized to scan clock. Use Value: ±6mA drive sustains bright LED current without external transistors; low tpd ensures crisp digit transitions at >1kHz scan rates. |
Use Scenario: Buffering 8-bit address lines between an MCU and parallel SRAM or flash memory. IC Role / Device Role / Timing Role: Bidirectional bus interface component - enabled only during memory read/write cycles to prevent bus contention. Use Value: High-impedance state eliminates loading on address bus during idle periods; 11ns tpd preserves setup/hold timing margins. |
| Network Switch Control Logic | I/O Expansion Interface |
|
Use Scenario: Isolating configuration GPIOs from ASIC management interfaces in Ethernet switch PHYs. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer for control signals (reset, mode select, interrupt) routed across board sections. Use Value: 2V–6V VCC range accommodates both 3.3V switch fabric and 5V legacy management peripherals; low ICC reduces thermal load in dense control planes. |
Use Scenario: Expanding GPIO count on an ARM Cortex-M4-based industrial controller for sensor/actuator interfacing. IC Role / Device Role / Timing Role: Parallel I/O extender where MCU writes to latch inputs and reads back status via 3-state outputs under OE control. Use Value: Dual OE pins allow independent control of input vs. output direction per bank; 1µA input leakage avoids false triggering on floating sense lines. |
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), identical pinout and function | Better suited for direct interfacing with legacy 5V TTL logic without level shifters | Choose SN74HCT244N when driving or receiving from standard 5V TTL families; SN74HC244ANSR preferred for pure CMOS or mixed-voltage systems. |
| 74LCX244MTCX | Lower VCC range (2.0V–3.6V), faster tpd (5.5ns @ 3.3V), different pinout (TSSOP-20), higher ESD rating (±2kV HBM) | Optimized for 3.3V-only portable/embedded systems requiring minimal propagation delay and footprint | Choose 74LCX244MTCX for space-constrained 3.3V designs needing sub-6ns speed; SN74HC244ANSR remains optimal for 2V–6V flexibility and SOIC availability. |
Compared with SN74HCT244N and 74LCX244MTCX, the SN74HC244ANSR uniquely balances wide supply voltage support, industry-standard SOIC packaging, and ultra-low static power - making it the default choice for general-purpose bus buffering across industrial, telecom, and embedded control applications where voltage agility and layout simplicity are prioritized.
Availability
SN74HC244ANSR is available at Aetrix Electronics and suitable for LED display drivers, memory address buffering, and network switch control logic requiring stable component supply across extended temperature ranges and multi-voltage platforms.
Supply support for SN74HC244ANSR 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74HC244ANSR belongs to TI's HC (High-Speed CMOS) logic family, designed for low-power, high-noise-immunity digital interfacing in cost-sensitive, thermally constrained, and voltage-flexible applications.
FAQ
What is the operating temperature range for SN74HC244ANSR?
The SN74HC244ANSR is rated for operation from –40°C to +125°C ambient temperature, validated per its Recommended Operating Conditions table. This range supports deployment in industrial motor drives, telecom infrastructure equipment, and automotive under-hood control modules where thermal robustness is essential. The SN74HC244ANSR maintains full electrical specification compliance across this entire span.
Does SN74HC244ANSR support 3.3V logic systems?
Yes, SN74HC244ANSR fully supports 3.3V operation: its VCC range includes 3.3V, VIH is guaranteed ≥2.0V at VCC = 3.3V, and VOL remains ≤0.26V at 6mA sink current. It interfaces seamlessly with 3.3V MCUs and FPGAs without level shifters, while retaining compatibility with 5V peripherals via its wide 2V–6V supply window.
How should unused inputs be handled on SN74HC244ANSR?
All unused inputs on SN74HC244ANSR must be tied to either VCC or GND - never left floating. Floating CMOS inputs cause excessive current draw, oscillation, and potential device damage. For OE pins, connect to VCC via a pull-up resistor (e.g., 10kΩ) to ensure high-impedance outputs at power-up. Unused A inputs should be terminated to VCC or GND using direct connections or appropriate resistors.
What is the maximum capacitive load SN74HC244ANSR can drive reliably?
SN74HC244ANSR is characterized for CL = 50pF and CL = 150pF loads, with tpd increasing from 11ns to 28ns (VCC = 6V). While it can drive heavier loads, signal integrity degrades beyond ~150pF due to increased rise/fall times and ringing risk. For >150pF traces or buses, add series damping resistors near outputs or use dedicated line drivers - the SN74HC244ANSR itself is optimized for point-to-point or lightly loaded bus segments.
Is SN74HC244ANSR pin-compatible with other 20-pin octal buffers?
SN74HC244ANSR shares the same 20-pin SOIC (DW) footprint and pinout with SN74HCT244N, SN74LS244N, and 74AC244 - enabling drop-in replacement in many legacy designs. However, electrical behavior differs: SN74HC244ANSR uses CMOS input thresholds and lower drive strength than LS/AC variants. Always verify VIH/VIL, output current, and timing margins before substitution.
SN74HC244ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 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-SO
SN74HC244ANSR FAQ
1.How can I place an order for SN74HC244ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC244ANSR 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 SN74HC244ANSR reliable?
The price and inventory of SN74HC244ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244ANSR is usually 5 days.
3.What payment methods are accepted for SN74HC244ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC244ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC244ANSR?
SN74HC244ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC244ANSR 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 SN74HC244ANSR?
For technical support, including SN74HC244ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244ANSR requirements.
6.How does Aetrix verify that SN74HC244ANSR is sourced from the original manufacturer or authorized distributors?
All SN74HC244ANSR 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 SN74HC244ANSR meets industry standards.
7.What is the process for return or replacement of SN74HC244ANSR?
All SN74HC244ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244ANSR, 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 SN74HC244ANSR part is unused and in its original packaging.
Return procedure for SN74HC244ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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