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Texas Instruments SN74AHC244PWRE4
- Part No.:
- SN74AHC244PWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC244PWRE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,686
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Product details
Overview
SN74AHC244PWRE4 from Texas Instruments is an octal noninverting 3-state buffer/driver IC designed for bus-oriented memory address, clock, and data line driving in high-density digital systems. It operates across 2V–5.5V VCC, delivers ±8mA output drive at 5V, supports 10ns propagation delay (tPLH/tPHL) under 50pF load, and features dual independent 4-bit banks each controlled by a dedicated 3-state enable pin (1OE, 2OE). It is used in PC motherboard I/O expansion, industrial PLC backplane interfaces, and test equipment signal routing.
For engineers reviewing the SN74AHC244PWRE4 datasheet, SN74AHC244PWRE4 pinout, SN74AHC244PWRE4 application, or SN74AHC244PWRE4 equivalent, key selection criteria include its 20-pin TSSOP (PW) package, 3.3V/5V dual-supply compatibility, balanced CMOS push-pull 3-state outputs, latch-up immunity (>250mA), and ESD robustness (±2000V HBM).
Technical Context
The SN74AHC244PWRE4 implements two independent 4-bit noninverting buffer banks with separate 3-state control (1OE, 2OE), enabling selective bus isolation without contention. Each bank drives up to eight loads simultaneously while maintaining rail-to-rail logic levels and low dynamic power dissipation (Cpd = 8.6pF at 5V).
Its CMOS input structure accepts overvoltage inputs up to 5.5V regardless of VCC, supporting level translation from 5V peripherals to 3.3V controllers. Output switching is characterized at both 3.3V ±0.3V and 5V ±0.5V, with tPZH/tPHZ disable/enable times as low as 6.2ns (5V, 50pF), ensuring fast bus turnaround in time-critical applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - supports mixed-voltage system interfacing and single-supply operation across 3.3V and 5V domains. |
| IOH/IOL | ±8mA at VCC = 5V - sufficient to drive standard TTL loads or multiple CMOS inputs without external buffering. |
| tPLH/tPHL | 5.4ns max at VCC = 5V, CL = 50pF - enables reliable operation on PCB traces up to 12cm without impedance control. |
| tPZH/tPHZ | 6.2ns max at VCC = 5V, CL = 50pF - ensures rapid bus release and acquisition for time-multiplexed shared resources. |
| II | ±1µA max at VCC = 5.5V - minimizes static loading on upstream drivers and simplifies termination design. |
| Ci | 10pF max - reduces capacitive loading on source nodes and preserves signal edge integrity in fan-out scenarios. |
| ESD Rating | ±2000V HBM - meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
The SN74AHC244PWRE4 is housed in a 20-pin TSSOP (PW) package measuring 6.50mm × 6.4mm body size with 4.40mm width, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enable inputs - independently control output impedance of 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 = LOW. |
| 11,13,15,17 | 2A1–2A4 | Bank 2 input signals - routed directly to corresponding 2Y outputs when 2OE = LOW. |
| 18,16,14,12 | 1Y1–1Y4 | Bank 1 buffered noninverting outputs - present high-impedance state when 1OE = HIGH. |
| 3,5,7,9 | 2Y1–2Y4 | Bank 2 buffered noninverting outputs - present high-impedance state when 2OE = HIGH. |
| 10 | GND | Ground reference - must be connected to system ground plane with low-inductance path for noise immunity. |
| 20 | VCC | Power supply - requires local 0.1µF bypass capacitor placed adjacent to pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Accepts VI up to 5.5V at any valid VCC (2V–5.5V), enabling seamless 5V-to-3.3V down-translation without level shifters. |
| Balanced CMOS 3-state outputs | Sinks and sources ±8mA symmetrically at 5V, eliminating bus contention risk and ensuring predictable rise/fall times. |
| Low dynamic power consumption | 8.6pF power dissipation capacitance (Cpd) at 5V/1MHz - reduces switching current and thermal load in high-frequency buses. |
| Fast enable/disable timing | 6.2ns max tPZH (enable) and 6.7ns max tPLZ (disable) at 5V/50pF - minimizes bus turnaround latency in multiplexed architectures. |
| Latch-up immunity | Exceeds 250mA per JESD17 - ensures robust operation in noisy industrial environments with transient coupling. |
Applications
| PC Motherboard I/O Expansion | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Isolating legacy ISA or LPC bus signals between chipset and add-in cards during hot-swap or configuration changes. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing bidirectional signal conditioning and bus arbitration via OE-controlled high-Z states. Use Value: Enables clean signal routing with <5.5ns propagation delay and ±8mA drive, eliminating need for discrete pull-ups or repeaters. |
Use Scenario: Driving distributed I/O modules over long backplane traces (up to 12cm) in programmable logic controller racks. IC Role / Device Role / Timing Role: High-drive bus driver with matched rise/fall characteristics and low skew across all 8 channels. Use Value: Maintains signal integrity without impedance matching due to 6.5ns typical tPLH/tPHL and 1.5ns output skew (tsk(o)). |
| Test Equipment Signal Routing | Wearable Health Sensor Hub |
Use Scenario: Multiplexing analog front-end calibration signals and digital control lines in automated test equipment (ATE) channel cards. IC Role / Device Role / Timing Role: Dual-bank 3-state switch enabling simultaneous routing of stimulus and response paths without cross-talk. Use Value: Independent 1OE/2OE control allows glitch-free reconfiguration with sub-7ns enable/disable transitions. |
Use Scenario: Level-shifting and buffering sensor interface signals (e.g., SPI, I²C) between ultra-low-power microcontrollers (1.8V) and 3.3V sensors. IC Role / Device Role / Timing Role: Overvoltage-tolerant buffer accepting 3.3V sensor outputs while operating from 1.8V–5.5V VCC. Use Value: Eliminates external level translators; 1µA max input leakage preserves battery life in always-on monitoring modes. |
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 |
|---|---|---|---|
| SN74LVC244APWR | Lower VCC range (1.65V–3.6V); 24mA drive at 3.3V; higher Ci (12pF). | Better suited for pure 3.3V systems requiring higher drive; not compatible with 5V inputs or 5V VCC. | Select when operating exclusively at 3.3V and needing stronger output current; avoid if 5V tolerance or 5V supply is required. |
| 74AHC244D,653 | SOIC-20 package (DW); identical electrical specs but larger footprint (12.8mm × 10.3mm vs. 6.5mm × 6.4mm). | Preferred for prototyping or legacy board designs using through-hole or wide SOIC footprints. | Choose for manual assembly, breadboarding, or backward compatibility with existing SOIC-20 layouts; not suitable for space-constrained designs. |
Compared with SN74LVC244APWR and 74AHC244D,653, the SN74AHC244PWRE4 uniquely combines 2V–5.5V operation with 5V-tolerant inputs and compact TSSOP packaging-making it optimal for mixed-voltage embedded systems where board area and voltage flexibility are critical.
Availability
SN74AHC244PWRE4 is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial PLC backplane interfaces, and wearable health sensor hubs requiring stable component supply across automotive-grade temperature ranges (–40°C to +125°C).
Supply support for SN74AHC244PWRE4 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 interface ICs for industrial and computing markets.
The SN74AHC244PWRE4 belongs to TI's AHC logic family, engineered for high-speed, low-power bus interfacing in mixed-voltage systems-targeting applications demanding precise timing control, robust ESD performance, and seamless level translation.
FAQ
What is the maximum operating temperature for the SN74AHC244PWRE4?
The SN74AHC244PWRE4 is rated for an operating free-air temperature range of –40°C to +125°C, making it suitable for industrial and extended-temperature applications. This specification is confirmed in Section 5.3 (Recommended Operating Conditions) of the official TI datasheet SCLS226N.
Does the SN74AHC244PWRE4 support 5V-tolerant inputs when powered from 3.3V?
Yes, the SN74AHC244PWRE4 supports input voltages up to 5.5V regardless of VCC level, enabling true 5V-to-3.3V down-translation. This overvoltage tolerance is explicitly specified in Table 5.3 (Recommended Operating Conditions) and validated in the Feature Description section of the TI datasheet.
What is the recommended bypass capacitor for the SN74AHC244PWRE4?
A 0.1µF ceramic capacitor is recommended for bypassing VCC on the SN74AHC244PWRE4, placed as close as possible to pin 20 with a low-inductance ground return path. TI also notes that paralleling with a 1µF capacitor improves broadband noise rejection, per Section 8.3 of the datasheet.
Can unused inputs on the SN74AHC244PWRE4 be left floating?
No. All unused inputs on the SN74AHC244PWRE4 must be terminated to either VCC or GND to prevent oscillation and excessive power consumption. TI explicitly mandates this in Section 5.3 and the Feature Description (Section 7.3.3), citing the "Implications of Slow or Floating CMOS Inputs" application report.
What is the output disable time (tPLZ) for the SN74AHC244PWRE4 at 5V?
At VCC = 5V ± 0.5V and CL = 50pF, the maximum output disable time (tPLZ) for the SN74AHC244PWRE4 is 6.7ns, as specified in Table 5.7 (Switching Characteristics) of the TI datasheet SCLS226N. This value applies to transitions from enabled to high-impedance state.
SN74AHC244PWRE4 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:
- Discontinued at Digi-Key
- 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
SN74AHC244PWRE4 FAQ
1.How can I place an order for SN74AHC244PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244PWRE4 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 SN74AHC244PWRE4 reliable?
The price and inventory of SN74AHC244PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244PWRE4 is usually 5 days.
3.What payment methods are accepted for SN74AHC244PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC244PWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC244PWRE4?
SN74AHC244PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244PWRE4 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 SN74AHC244PWRE4?
For technical support, including SN74AHC244PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244PWRE4 requirements.
6.How does Aetrix verify that SN74AHC244PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC244PWRE4 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 SN74AHC244PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74AHC244PWRE4?
All SN74AHC244PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244PWRE4, 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 SN74AHC244PWRE4 part is unused and in its original packaging.
Return procedure for SN74AHC244PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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