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Texas Instruments SN74AHC244PW
- Part No.:
- SN74AHC244PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC244PW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:260
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Product details
Overview
SN74AHC244PW from Texas Instruments is an octal 3-state noninverting buffer/driver IC designed for bus-oriented 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 15pF load propagation delays as low as 3.9ns (tPLH/tPHL). It is used in PC motherboard address/data bus buffering and industrial I/O expansion modules.
For engineers reviewing the SN74AHC244PW datasheet, SN74AHC244PW pinout, SN74AHC244PW application, or SN74AHC244PW equivalent, key selection criteria include its dual-bank 3-state control architecture, rail-to-rail input tolerance up to 5.5V, high-speed switching performance at 3.3V/5V, and TSSOP-20 package thermal characteristics for dense PCB layouts.
Technical Context
The SN74AHC244PW implements two independent 4-bit CMOS buffer banks with fully balanced push-pull outputs capable of sourcing and sinking equal current (±8mA at 5V). Each bank's four outputs are simultaneously enabled or disabled via dedicated OE inputs, supporting bidirectional bus isolation without external logic.
Its standard CMOS inputs tolerate voltages up to 5.5V regardless of VCC level-enabling level translation from 5V systems to 3.3V or 2.5V domains. The device uses no internal clamping diodes on outputs for positive voltage excursions, relying instead on absolute maximum ratings and external protection where needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - Enables interoperability across 2.5V, 3.3V, and 5V logic domains without level shifters. |
| Output Drive | ±8mA at VCC = 5V - Sufficient to drive 50pF loads over 12cm traces while maintaining signal integrity. |
| Propagation Delay | 3.9ns max (tPLH/tPHL, CL = 15pF, VCC = 5V) - Supports >100MHz bus operation in point-to-point configurations. |
| Input Voltage Tolerance | VI up to 5.5V at any valid VCC - Allows direct connection to 5V peripherals when VCC = 3.3V (down-translation). |
| 3-State Leakage | ±2.5µA max (IOZ, VCC = 5.5V) - Ensures minimal bus contention current during high-impedance state. |
| ESD Rating | ±2000V HBM - Meets industrial handling requirements without additional ESD protection circuitry. |
| Operating Temperature | –40°C to +125°C - Qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
TSSOP-20 package (PW suffix): 6.50mm × 6.4mm body size, 0.65mm pitch, 20-pin surface-mount with exposed thermal pad (not present in PW variant per datasheet Figure 4-3).
| 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) respectively. |
| 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. |
| 12,14,16,18 | 1Y1–1Y4 | Bank 1 noninverting buffered outputs - high-impedance when 1OE = H. |
| 3,5,7,9 | 2Y1–2Y4 | Bank 2 noninverting buffered outputs - high-impedance when 2OE = H. |
| 10 | GND | Ground reference for all logic and output stages - must be low-inductance connection for noise immunity. |
| 20 | VCC | Power supply for internal logic and output drivers - requires local 0.1µF bypass capacitor per TI layout guidelines. |
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. |
| Rail-to-rail input tolerance | Accepts 0–5.5V inputs at any VCC (2–5.5V), eliminating external level translators in mixed-voltage systems. |
| Balanced CMOS 3-state outputs | Sinks and sources identical current (±8mA), ensuring symmetrical rise/fall times and reduced ground bounce. |
| Low propagation skew | tsk(o) ≤1.5ns (CL = 50pF) - maintains timing alignment across all 8 outputs for synchronous bus interfaces. |
| High noise immunity | VIH(D) ≥3.5V / VIL(D) ≤1.5V at 5V - rejects transient noise on shared control buses in noisy industrial environments. |
Applications
| PC Motherboard Bus Buffering | Industrial I/O Expansion Module |
|---|---|
Use Scenario: Isolating CPU address/data bus from peripheral expansion slots during hot-plug events. IC Role / Device Role / Timing Role: Octal buffer providing direction-controlled 3-state isolation between host controller and add-in cards. Use Value: Prevents bus contention during card insertion/removal using independent OE pins, with <4ns propagation delay preserving timing margins. |
Use Scenario: Driving multiple isolated digital I/O channels from a microcontroller GPIO header. IC Role / Device Role / Timing Role: Level-translating buffer enabling 5V sensor/actuator interfacing from 3.3V MCU outputs. Use Value: 5.5V-tolerant inputs allow direct connection to legacy 5V field devices without external translators; ±8mA drive ensures robust noise margin. |
| Network Switch Backplane Interface | Test & Measurement Equipment Signal Routing |
Use Scenario: Fan-out and impedance matching of clock/address signals across multi-layer switch fabric PCBs. IC Role / Device Role / Timing Role: High-speed bus driver minimizing signal degradation on >10cm traces with controlled edge rates. Use Value: 3.9ns tPLH at 5V and Δt/Δv ≤20ns/V ensure clean transitions into 50pF loads, reducing jitter accumulation in timing-critical paths. |
Use Scenario: Multiplexing DUT signals to measurement instruments via programmable relay matrices. IC Role / Device Role / Timing Role: Bidirectional signal gate enabling channel selection without loading inactive paths. Use Value: <2.5µA 3-state leakage prevents crosstalk between unselected channels; rail-to-rail inputs support mixed-signal test fixtures. |
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 (1.65–3.6V); 24mA drive at 3.3V; higher ICC (max 40µA vs. 40µA typical) | Optimized for 3.3V-only systems; unsuitable for 5V interface or down-translation | Select when operating exclusively at 3.3V and requiring higher drive strength than SN74AHC244PW. |
| SN74AHCT244PW | CMOS inputs with TTL-compatible thresholds (VIH = 2V min); identical 2–5.5V VCC range and pinout | Designed for legacy 5V TTL system integration; less suitable for pure CMOS 2.5V/3.3V domains | Select when interfacing with older 5V TTL logic families where input threshold compatibility is critical. |
Compared with 74LVC244APW and SN74AHCT244PW, the SN74AHC244PW uniquely supports true 2V–5.5V operation with 5.5V-tolerant inputs-making it the only option among the three capable of reliable down-translation from 5V peripherals to sub-3.3V controllers without external components.
Availability
SN74AHC244PW is available at Aetrix Electronics and suitable for PC motherboard bus buffering, industrial I/O expansion modules, and network switch backplane interfaces requiring stable component supply across extended temperature ranges and mixed-voltage designs.
Supply support for SN74AHC244PW 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The SN74AHC244PW belongs to TI's AHC (Advanced High-Speed CMOS) logic family, engineered for high-speed, low-power bus interface applications with robust noise immunity and wide supply voltage flexibility.
FAQ
What is the maximum output current rating for SN74AHC244PW per pin?
The SN74AHC244PW supports ±8mA continuous output current per pin at VCC = 5V, as specified in the Recommended Operating Conditions table. This rating applies to both sourcing (IOH) and sinking (IOL) modes. Exceeding this limit risks thermal overstress or parametric shift, especially under sustained load conditions across multiple outputs.
Does SN74AHC244PW support level translation between different supply voltages?
Yes, SN74AHC244PW supports down-translation: its inputs tolerate up to 5.5V regardless of VCC level (e.g., 3.3V or 2.5V), allowing direct connection of 5V peripherals to lower-voltage controllers. However, it does not support up-translation - outputs swing only between GND and the applied VCC.
What is the recommended bypass capacitor configuration for SN74AHC244PW?
Texas Instruments recommends a 0.1µF ceramic capacitor placed as close as possible to the VCC pin (pin 20) with a low-inductance path to GND (pin 10). For enhanced high-frequency noise suppression, a parallel 1µF capacitor may be added. Layout guidelines specify short, wide traces and placement on the same PCB layer as the IC.
How does the dual-output-enable architecture of SN74AHC244PW improve system design?
The SN74AHC244PW's separate 1OE and 2OE pins allow independent control of two 4-bit banks. This enables selective bus isolation - for example, disabling memory address lines while keeping data lines active - reducing contention risk and simplifying timing-critical control sequences in multiprocessor or hot-swap systems.
Is SN74AHC244PW compatible with 5V TTL logic inputs?
No, SN74AHC244PW has CMOS input thresholds (VIH = 3.85V min at VCC = 5.5V), which exceed standard TTL VIH (2.0V). For reliable interfacing with 5V TTL outputs, use SN74AHCT244PW instead - its TTL-compatible inputs guarantee recognition of 2.0V+ logic highs while retaining identical pinout and functionality.
SN74AHC244PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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
SN74AHC244PW FAQ
1.How can I place an order for SN74AHC244PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244PW 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 SN74AHC244PW reliable?
The price and inventory of SN74AHC244PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244PW is usually 5 days.
3.What payment methods are accepted for SN74AHC244PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC244PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC244PW?
SN74AHC244PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244PW 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 SN74AHC244PW?
For technical support, including SN74AHC244PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244PW requirements.
6.How does Aetrix verify that SN74AHC244PW is sourced from the original manufacturer or authorized distributors?
All SN74AHC244PW 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 SN74AHC244PW meets industry standards.
7.What is the process for return or replacement of SN74AHC244PW?
All SN74AHC244PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244PW, 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 SN74AHC244PW part is unused and in its original packaging.
Return procedure for SN74AHC244PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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