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Texas Instruments SN74AHC244DWRG4
- Part No.:
- SN74AHC244DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC244DWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,323
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Product details
Overview
SN74AHC244DWRG4 from Texas Instruments is an octal noninverting 3-state buffer/driver IC designed for high-speed bus interface applications. It features two independent 4-bit banks, each controlled by a dedicated output-enable pin (1OE, 2OE), operates across 2V–5.5V VCC, delivers ±8mA output drive at 5V, and supports propagation delays as low as 3.9ns (tPLH/tPHL, CL=15pF, VCC=5V). It is used in PC motherboard address/data bus buffering and industrial backplane signal conditioning.
For engineers reviewing the SN74AHC244DWRG4 datasheet, SN74AHC244DWRG4 pinout, SN74AHC244DWRG4 application, or SN74AHC244DWRG4 equivalent, key selection criteria include 3-state bus isolation capability, rail-to-rail input tolerance up to 5.5V, SOIC-20 package thermal performance (RθJA = 81.1°C/W), and compatibility with 3.3V/5V mixed-voltage system interfacing.
Technical Context
The SN74AHC244DWRG4 implements dual 4-bit CMOS buffer banks with independent 3-state control logic. Each bank (Bank 1: pins 1A1–1A4 → 1Y1–1Y4; Bank 2: 2A1–2A4 → 2Y1–2Y4) performs noninverting logic (xYn = xAn) and enters high-impedance state when its OE pin is high. Input structure includes overvoltage-tolerant CMOS gates rated to 5.5V regardless of VCC level.
Its balanced push-pull outputs provide symmetrical sourcing/sinking capability (±8mA at 5V), enabling clean signal integrity on PCB traces up to 12cm without termination. The device requires external pull-up resistors on OE pins for power-up/down high-impedance safety and mandates 0.1µF bypass capacitors at VCC–GND per TI layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - Enables interoperability between 3.3V and 5V logic domains without level shifters. |
| Output Drive | ±8mA at VCC = 5V - Sufficient to drive 50pF loads with <6.5ns propagation delay, supporting medium-length PCB traces. |
| Propagation Delay | 3.9ns (min, tPLH/tPHL, CL=15pF, VCC=5V) - Meets timing requirements for 100+ MHz bus clocking in PCs and network switches. |
| Input Voltage Tolerance | VI up to 5.5V independent of VCC - Allows safe down-translation from 5V peripherals to 3.3V controllers. |
| 3-State Leakage | ±2.5µA max (IOZ, VCC=5.5V) - Ensures minimal bus contention current when outputs are disabled. |
| ESD Rating | ±2000V HBM - Meets industrial handling robustness requirements without additional protection circuitry. |
| Power Dissipation Cap. | 8.6pF (Cpd) - Predictable dynamic power consumption for thermal modeling in dense layouts. |
Pinout & Package
SN74AHC244DWRG4 is supplied in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm with 12.8mm × 7.5mm body size. Pin pitch is 1.27mm; leads are gull-wing, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enable inputs - Control high-impedance state for respective 4-bit banks; require pull-up to VCC for power-safe default. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - Accept 5.5V-tolerant logic signals; must be tied to VCC or GND if unused. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Noninverting 3-state outputs - Drive buses bidirectionally; enter Z-state when OE is high. |
| 10 | GND | Ground reference - Return path for all I/O and supply currents; must connect to low-impedance system ground plane. |
| 20 | VCC | Power supply - Requires local 0.1µF ceramic bypass capacitor placed adjacent to pin per TI layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit banks | Enables selective bus isolation - e.g., isolate memory address lines while keeping data lines active. |
| Rail-to-rail input voltage tolerance | Accepts 0–5.5V inputs at any VCC (2–5.5V), eliminating external level translators in mixed-voltage systems. |
| Balanced ±8mA output drive | Supports fast edge rates into 50pF loads without overshoot, reducing need for series termination on short traces. |
| Low 3-state leakage (±2.5µA) | Minimizes standby current in multiplexed bus architectures where multiple drivers share one data line. |
| SOIC-20 thermal performance | RθJA = 81.1°C/W enables operation at full drive in industrial ambient (≤125°C TA) with standard PCB copper area. |
Applications
| PC Motherboard Bus Buffering | Industrial Backplane Interface |
|---|---|
|
Use Scenario: Driving address and control signals from CPU to multiple peripheral slots on ATX motherboards. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address bus from expansion slot loads during hot-plug events. Use Value: Prevents bus contention via independent OE control; ±8mA drive ensures signal integrity across 10cm trace lengths without added termination. |
Use Scenario: Interfacing microcontroller I/O to modular I/O cards in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Level-translating buffer enabling 3.3V MCU to drive 5V-tolerant fieldbus transceivers and sensor inputs. Use Value: 5.5V input tolerance allows direct connection to 5V sensors; SOIC package supports automated assembly in industrial-grade PCBs. |
| Network Switch Data Path | Test Equipment Signal Conditioning |
|
Use Scenario: Isolating MAC-layer data lanes between switch ASIC and PHY modules in 1G Ethernet switches. IC Role / Device Role / Timing Role: High-speed bus driver providing clean, low-skew signals to parallel PHY interfaces with simultaneous enable control. Use Value: 3.9ns propagation delay meets setup/hold timing budgets for 125MHz DDR signaling; dual OE supports staggered lane activation. |
Use Scenario: Conditioning digital stimulus signals from arbitrary waveform generators before injection into DUTs. IC Role / Device Role / Timing Role: Output amplifier and impedance-matching buffer ensuring consistent rise/fall times across variable load capacitances. Use Value: Balanced drive minimizes distortion on 50Ω coaxial paths; 3-state capability enables multi-source signal routing in ATE racks. |
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 (1.65–3.6V); 24mA drive at 3.3V; higher Cpd (22pF) | Better suited for pure 3.3V systems requiring higher drive; not 5V-tolerant on inputs | Select when operating exclusively at 3.3V and needing stronger drive than SN74AHC244DWRG4 provides. |
| 74AHC244PW,118 | NXP variant in TSSOP-20; identical electrical specs but different RθJA (116.8°C/W) and package footprint | Requires PCB layout revision due to 6.5mm × 6.4mm TSSOP vs. 12.8mm × 10.3mm SOIC | Choose only if board space constraints necessitate smaller package and thermal derating is acceptable. |
Compared with SN74LVC244APWR and 74AHC244PW,118, the SN74AHC244DWRG4 uniquely supports 2–5.5V operation with 5.5V-tolerant inputs, making it the only option among the three for mixed-voltage 3.3V/5V system interfacing without external level translation.
Availability
SN74AHC244DWRG4 is available at Aetrix Electronics and suitable for PC motherboard design, industrial PLC backplanes, and network switch data-path buffering requiring stable component supply across extended product lifecycles.
Supply support for SN74AHC244DWRG4 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 applications.
The SN74AHC244 family was developed to deliver high-speed, low-power 3-state buffering for memory and bus interfaces in PCs, networking gear, and industrial control systems - emphasizing voltage flexibility, noise immunity, and layout-friendly SOIC packaging.
FAQ
What is the maximum input voltage rating for SN74AHC244DWRG4?
The SN74AHC244DWRG4 accepts input voltages up to 5.5V regardless of VCC level, enabling safe interfacing with 5V peripherals even when powered from 3.3V. This overvoltage tolerance is specified in the Recommended Operating Conditions table and eliminates the need for external level-shifting circuitry in mixed-voltage designs involving the SN74AHC244DWRG4.
Does SN74AHC244DWRG4 support hot-swap or live-insertion scenarios?
Yes - the SN74AHC244DWRG4 supports hot-swap operation through its dual independent 3-state enable pins (1OE, 2OE). By asserting OE high before insertion, all outputs enter high-impedance mode, preventing bus contention. TI recommends tying both OE pins to VCC via pull-up resistors to ensure this safe state during power-up/down sequences involving the SN74AHC244DWRG4.
What bypass capacitor value is required for stable operation of SN74AHC244DWRG4?
A 0.1µF ceramic capacitor is required per TI's layout guidelines for the SN74AHC244DWRG4, placed as close as possible to the VCC pin (pin 20) with a low-inductance path to GND (pin 10). Parallel use of a 1µF capacitor is acceptable to suppress broader-frequency noise, but the 0.1µF unit is mandatory for high-frequency decoupling critical to SN74AHC244DWRG4 signal integrity.
Can SN74AHC244DWRG4 drive 50Ω transmission lines directly?
No - the SN74AHC244DWRG4 is not designed for direct 50Ω source termination. Its ±8mA drive at 5V yields ~625Ω output impedance, making it suitable for unterminated or lightly loaded buses (<50pF). For controlled-impedance traces >12cm, TI recommends adding a series damping resistor near the SN74AHC244DWRG4 output to suppress ringing, as detailed in Application Note SCLS226N.
Is SN74AHC244DWRG4 pin-compatible with older SN74LS244 variants?
No - although functionally similar, the SN74AHC244DWRG4 is not pin-compatible with bipolar SN74LS244 devices. The SN74AHC244DWRG4 uses CMOS technology with different input thresholds, drive strength, and power characteristics. Direct replacement requires validation of timing margins, voltage levels, and layout adjustments due to differing electrical behavior of the SN74AHC244DWRG4.
SN74AHC244DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
SN74AHC244DWRG4 FAQ
1.How can I place an order for SN74AHC244DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244DWRG4 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 SN74AHC244DWRG4 reliable?
The price and inventory of SN74AHC244DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74AHC244DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC244DWRG4 transactions.
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4.How is shipping managed for SN74AHC244DWRG4?
SN74AHC244DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244DWRG4 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 SN74AHC244DWRG4?
For technical support, including SN74AHC244DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244DWRG4 requirements.
6.How does Aetrix verify that SN74AHC244DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC244DWRG4 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 SN74AHC244DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC244DWRG4?
All SN74AHC244DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244DWRG4, 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 SN74AHC244DWRG4 part is unused and in its original packaging.
Return procedure for SN74AHC244DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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