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Texas Instruments SN74AHC244PWR
- Part No.:
- SN74AHC244PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC244PWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,653
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Product details
Overview
SN74AHC244PWR from Texas Instruments is an octal 3-state buffer/driver IC designed for bus-oriented signal routing in memory-address, clock, and data transmission systems. It operates across 2V–5.5V VCC, delivers ±8mA output drive at 5V, supports 3.3V/5V logic translation, and features dual independent 4-bit banks with separate 3-state enables (1OE, 2OE). It is used in PC motherboard I/O expansion, industrial backplane interfaces, and test equipment signal conditioning.
For engineers reviewing the SN74AHC244PWR datasheet, SN74AHC244PWR pinout, SN74AHC244PWR application, or SN74AHC244PWR equivalent, key selection criteria include its 20-pin TSSOP package (PW), 3.9ns typical propagation delay at 5V, balanced CMOS push-pull outputs, overvoltage-tolerant inputs up to 5.5V, and compatibility with mixed-voltage system-level interfacing.
Technical Context
The SN74AHC244PWR implements two independent 4-bit noninverting buffer banks, each controlled by a dedicated output-enable input (1OE, 2OE). Each bank drives four outputs (e.g., 1Y1–1Y4) from corresponding inputs (1A1–1A4), with boolean function xYn = xAn. Outputs enter high-impedance state when OE is high, enabling bidirectional bus sharing without contention.
It uses advanced CMOS process technology to achieve rail-to-rail output swing, low static current (4µA typical ICC), and fast switching (tPLH/tPHL ≤ 6.5ns at 5V, CL = 15pF). Input transition rate limits (20ns/V at 5V) and ESD robustness (±2000V HBM) support reliable operation in noisy industrial and computing environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - Enables interoperability across 3.3V and 5V logic domains and supports brown-out tolerant operation. |
| Output Drive | ±8mA at VCC = 5V - Sufficient to drive 50pF loads over 12cm PCB traces while maintaining signal integrity. |
| Propagation Delay | 3.9ns (tPLH/tPHL, VCC = 5V, CL = 15pF) - Supports >100MHz bus timing margins in high-speed digital interfaces. |
| Input Voltage Tolerance | VI up to 5.5V regardless of VCC - Allows safe level-shifting from higher-voltage peripherals into lower-VCC logic domains. |
| ESD Rating | ±2000V HBM - Meets JEDEC JS-001 requirements for robust handling in automated assembly and field service. |
| Quiescent Current | 4µA typical ICC - Minimizes standby power in battery-backed or energy-sensitive applications like wearables. |
| Operating Temperature | –40°C to +125°C - Qualified for extended industrial temperature range operation in embedded controllers and infrastructure gear. |
Pinout & Package
TSSOP-20 (PW) package: 6.50mm × 6.4mm body size, 0.65mm pitch, exposed thermal pad (not electrically connected; may be floated or tied to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enable inputs controlling Bank 1 (pins 2,4,6,8 → 18,16,14,12) and Bank 2 (pins 11,13,15,17 → 3,5,7,9). |
| 2,4,6,8 | 1A1–1A4 | Bank 1 input signals - routed directly to corresponding 1Y outputs when 1OE = L. |
| 11,13,15,17 | 2A1–2A4 | Bank 2 input signals - routed directly to corresponding 2Y outputs when 2OE = L. |
| 12,14,16,18 | 1Y1–1Y4 | Bank 1 buffered noninverting outputs - high-impedance when 1OE = H. |
| 3,5,7,9 | 2Y1–2Y4 | Bank 2 buffered noninverting outputs - high-impedance when 2OE = H. |
| 10 | GND | Ground reference for all logic and output stages - must be low-impedance connection to minimize noise coupling. |
| 20 | VCC | Primary power supply - requires local 0.1µF bypass capacitor placed adjacent to pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Balanced CMOS outputs | ±8mA sink/source capability at 5V ensures matched rise/fall times and reduced ground bounce in multi-driver systems. |
| Overvoltage-tolerant inputs | Accepts up to 5.5V regardless of VCC - eliminates need for external level shifters when interfacing 5V sensors to 3.3V microcontrollers. |
| Dual independent 3-state control | Separate 1OE/2OE pins allow selective isolation of two 4-bit data paths - essential for multiplexed address/data buses and hot-swap I/O expansion. |
| Low dynamic power consumption | 8.6pF typical Cpd - minimizes switching current and heat generation in high-frequency clock distribution applications. |
| Robust ESD protection | ±2000V HBM rating - exceeds standard manufacturing ESD control requirements and reduces field failure risk. |
Applications
| PC Motherboard I/O Expansion | Industrial Backplane Interface |
|---|---|
|
Use Scenario: Isolating legacy parallel port or LPC bus signals between chipset and add-in cards while preventing bus contention. IC Role / Device Role: Bidirectional 3-state buffer providing voltage-level translation and driver strength enhancement for long-trace routing. Use Value: Enables reliable 12cm trace lengths at 33MHz without signal degradation, reducing need for active repeaters or impedance-matched layouts. |
Use Scenario: Driving differential receiver inputs on modular PLC backplanes where multiple modules share a common data bus. IC Role / Device Role: High-drive buffer isolating module-specific control lines from shared backplane, with independent enable per channel group. Use Value: ±8mA drive ensures clean logic transitions across 50pF distributed capacitance, supporting deterministic timing in real-time control loops. |
| Wearable Health Sensor Hub | Automated Test Equipment (ATE) |
|
Use Scenario: Level-shifting analog sensor ADC outputs (5V) to a 3.3V microcontroller while minimizing quiescent power draw. IC Role / Device Role: Low-power octal buffer with overvoltage-tolerant inputs, operating at 3.3V VCC with 5V input signals. Use Value: 4µA typical ICC extends battery life in always-on monitoring modes, while 5.5V input tolerance eliminates external clamping diodes. |
Use Scenario: Conditioning and distributing high-speed trigger and strobe signals across multiple instrument channels in synchronized test setups. IC Role / Device Role: Precision timing buffer delivering matched propagation delays (<1.5ns skew) across eight parallel outputs. Use Value: 3.9ns tPLH/tPHL and <1ns tsk(o) ensure sub-nanosecond inter-channel alignment critical for jitter-sensitive parametric measurements. |
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 |
|---|---|---|---|
| 74LVC244APW | Lower VCC range (1.65V–3.6V); 24mA drive at 3.3V; smaller 6.5mm × 4.4mm TSSOP package. | Optimized for 3.3V-only systems; unsuitable for 5V interface or mixed-voltage translation. | Select when full 2V–5.5V operation is unnecessary and higher drive at 3.3V is required. |
| SN74AHCT244PWR | CMOS input thresholds compatible with TTL levels (VIH = 2.0V min); identical 20-pin TSSOP package and pinout. | Designed for legacy 5V TTL system integration where input compatibility with older logic families is mandatory. | Choose when interfacing with 5V TTL outputs or when guaranteed VIH/VIL margins under noisy conditions are critical. |
Compared with SN74AHC244PWR, the 74LVC244APW offers higher drive in 3.3V-only systems but lacks 5V tolerance, while SN74AHCT244PWR provides TTL-compatible inputs at identical packaging-making it ideal for retrofitting legacy 5V designs without layout changes.
Availability
SN74AHC244PWR is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial backplane interfaces, and wearable health sensor hubs requiring stable component supply across extended temperature ranges and mixed-voltage operation.
Supply support for SN74AHC244PWR 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 experience in high-reliability industrial and computing components.
The SN74AHC244PWR belongs to TI's AHC logic family, engineered for high-speed, low-power, mixed-voltage bus interfacing in computing, communications, and industrial control systems.
FAQ
What is the maximum input voltage allowed on SN74AHC244PWR pins when VCC = 3.3V?
The SN74AHC244PWR supports input voltages up to 5.5V regardless of VCC level. This overvoltage tolerance allows direct connection of 5V signals-such as from legacy peripherals or sensors-to the SN74AHC244PWR while powered at 3.3V, eliminating external level-shifting circuitry and simplifying design in mixed-voltage systems.
Does SN74AHC244PWR have pin-to-pin compatibility with other octal buffer variants?
SN74AHC244PWR shares identical pinout and functionality with SN74AHCT244PWR and SN74LVC244APW in the TSSOP-20 (PW) package. However, only SN74AHCT244PWR is guaranteed pin-compatible due to matching electrical behavior and TI's documented drop-in replacement guidance for TTL-compatible applications.
What is the recommended bypass capacitor for SN74AHC244PWR?
A 0.1µF ceramic capacitor is recommended for SN74AHC244PWR, placed as close as possible to the VCC pin (pin 20) with a short, low-inductance path to GND (pin 10). For enhanced high-frequency noise suppression, TI recommends paralleling this with a 1µF capacitor-both mounted on the same PCB side near the device.
Can unused inputs on SN74AHC244PWR be left floating?
No. All unused inputs on SN74AHC244PWR must be terminated to either VCC or GND to prevent oscillation, excessive power consumption, or latch-up. TI specifies that floating CMOS inputs violate recommended operating conditions; a 10kΩ pull-up or pull-down resistor is acceptable if active driving is not guaranteed during all operational states.
What thermal considerations apply to SN74AHC244PWR in continuous operation?
SN74AHC244PWR in TSSOP-20 (PW) package has RθJA = 116.8°C/W. At 8mA per output and 5V VCC, worst-case power dissipation remains below 50mW, resulting in <6°C junction-to-ambient rise under typical board conditions. No heatsink is required, but thermal relief pads and adequate copper area improve reliability in high-density layouts.
SN74AHC244PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHC244PWR FAQ
1.How can I place an order for SN74AHC244PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244PWR 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 SN74AHC244PWR reliable?
The price and inventory of SN74AHC244PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244PWR is usually 5 days.
3.What payment methods are accepted for SN74AHC244PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC244PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC244PWR?
SN74AHC244PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244PWR 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 SN74AHC244PWR?
For technical support, including SN74AHC244PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244PWR requirements.
6.How does Aetrix verify that SN74AHC244PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC244PWR 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 SN74AHC244PWR meets industry standards.
7.What is the process for return or replacement of SN74AHC244PWR?
All SN74AHC244PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244PWR, 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 SN74AHC244PWR part is unused and in its original packaging.
Return procedure for SN74AHC244PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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