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onsemi 74AC244SJX
- Part No.:
- 74AC244SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74AC244SJX.pdf
- Description:
- IC BUFF NON-INVERT 6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,780
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Product details
Overview
74AC244SJX from ON Semiconductor is an octal non-inverting 3-STATE buffer/line driver designed for memory address driving, clock distribution, and bus-oriented data transmission in high-density PCB layouts. It operates from 2.0V to 6.0V, delivers ±24mA output drive, features 9.0ns max propagation delay at 5.0V, and supports industrial temperature range (−40°C to +85°C).
For engineers reviewing the 74AC244SJX datasheet, pinout, applications, or equivalent options, key selection criteria include supply voltage compatibility (2.0–6.0V), 3-STATE enable timing (tPZH/tPLZ ≤ 11.5ns), output current capability (±24mA), and SOP-20 package footprint constraints.
Technical Context
The 74AC244SJX implements two independent 4-bit groups (I0–I3/O0–O3 and I4–I7/O4–O7), each controlled by a dedicated 3-STATE enable input (OE1 on pins 12/14/16/18; OE2 on pins 3/5/7/9). Its AC logic family ensures CMOS-level input thresholds and rail-to-rail output swing with low ICC (≤40µA) and low IOZ (≤2.5µA in 3-STATE).
It uses standard TTL-compatible output structures with symmetrical sourcing/sinking capability, enabling bidirectional bus interfacing without external pull-ups. Propagation delays (tPLH/tPHL ≤ 9.0ns at VCC = 5.0V, CL = 50pF) and fast enable/disable times (tPZH/tPLZ ≤ 11.5ns) support reliable operation in 25MHz+ address/data bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced CMOS (AC), compatible with 3.3V and 5V systems |
| Supply Voltage Range | 2.0V to 6.0V - supports mixed-voltage board designs and legacy 5V infrastructure |
| Output Drive | ±24mA per output - sufficient to drive 50pF loads with <10ns edge integrity |
| Propagation Delay | ≤9.0ns (tPLH/tPHL at VCC = 5.0V, CL = 50pF) - enables reliable timing in >25MHz bus applications |
| 3-STATE Enable Time | ≤11.0ns (tPZH/tPZL at VCC = 5.0V) - minimizes bus contention during direction switching |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
| Input Thresholds | VIH = 2.1V, VIL = 0.9V at VCC = 3.0V - provides 1.2V noise margin under typical conditions |
Pinout & Package
74AC244SJX is housed in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (package code M20D), with 1.27mm lead pitch and gull-wing terminations suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 10, 11, 13, 15 | Inputs (I0–I3, I4–I7) | Non-inverting data inputs; accept CMOS-level signals across full VCC range |
| 3, 5, 7, 9 | OE2 (Group 2 Enable) | Active-low enable for outputs O4–O7; shared across four outputs |
| 12, 14, 16, 18 | OE1 (Group 1 Enable) | Active-low enable for outputs O0–O3; independent control from OE2 |
| 17, 19, 20, 8, 13, 15, 16, 18 | Outputs (O0–O7) | 3-STATE buffered outputs; high-impedance when respective OE is HIGH |
| 19 | VCC | Positive supply terminal; must be decoupled locally to minimize switching noise |
| 10 | GND | Ground reference for all inputs, outputs, and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit groups | Enables selective bus isolation: O0–O3 and O4–O7 controlled separately via OE1/OE2 |
| Low ICC and IOZ | Quiescent supply current ≤40µA and 3-STATE leakage ≤2.5µA reduce system standby power |
| Rail-to-rail output swing | VOH ≥4.4V / VOL ≤0.5V at VCC = 5.0V and IOUT = ±24mA ensures robust logic level margins |
| High-speed 3-STATE control | tPZH/tPLZ ≤11.0ns prevents bus glitches during enable/disable transitions |
| JEDEC-standard SOP package | M20D footprint (5.3mm width, 1.27mm pitch) ensures compatibility with automated assembly and IPC-7351B land patterns |
Applications
| Memory Address Buffering | Microcontroller Bus Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting buffer isolating MCU address outputs while enabling/disabling segments via OE1/OE2 to prevent contention. Use Value: ±24mA drive sustains signal integrity across 10cm traces; 9.0ns propagation delay aligns with 25MHz address setup/hold windows. |
Use Scenario: Interfacing an 8-bit microcontroller's data port to a peripheral with different voltage or loading requirements. IC Role / Device Role / Timing Role: Level-shifting and load-driving buffer between MCU I/O and peripheral register interface. Use Value: 2.0–6.0V supply range bridges 3.3V MCU and 5V peripheral; dual OE pins allow dynamic bus partitioning. |
| Industrial PLC Backplane | Legacy ISA Bus Extension |
|
Use Scenario: Expanding I/O capacity in programmable logic controllers using modular backplane architecture. IC Role / Device Role / Timing Role: Bidirectional line driver buffering control/status signals between CPU module and I/O carrier cards. Use Value: −40°C to +85°C rating ensures reliability in uncontrolled cabinet environments; low IOZ (<2.5µA) prevents false triggering during hot-swap events. |
Use Scenario: Adding parallel port functionality to modern embedded systems emulating ISA bus timing. IC Role / Device Role / Timing Role: Address/data latch driver synchronizing with ISA's 8MHz clock and 200ns strobe windows. Use Value: tPZH/tPLZ ≤11.0ns meets ISA's 150ns enable-to-valid requirement; SOP-20 footprint fits space-constrained retro-compatibility boards. |
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 |
|---|---|---|---|
| 74ACT244SJX | TTL-compatible inputs (VIH = 2.0V, VIL = 0.8V at VCC = 5V); otherwise identical AC specs and pinout | Better suited for mixed-logic systems with legacy TTL sources; requires 4.5–5.5V supply only | Select when interfacing with 74LS/74F series drivers; not recommended for 3.3V-only systems |
| SN74LVC244APWR | Lower VCC range (1.65–3.6V), higher speed (tPD ≤ 5.6ns), but reduced drive (±24mA only at VCC ≥ 3.0V) | Optimized for 3.3V/2.5V portable and low-power designs; incompatible with 5V buses | Choose for battery-powered or modern low-voltage platforms; avoid if 5V tolerance or mixed-voltage operation is required |
Compared with 74AC244SJX, 74ACT244SJX offers TTL input compatibility at the cost of narrower supply range, while SN74LVC244APWR delivers faster timing and lower voltage operation but sacrifices 5V bus interoperability and industrial temperature margin.
Availability
74AC244SJX is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus interfacing, and industrial PLC backplane expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AC244SJX 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
ON Semiconductor (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor solutions for automotive, industrial, cloud computing, and IoT applications.
The 74AC244SJX belongs to ON Semiconductor's legacy logic portfolio, engineered for high-reliability, mixed-voltage digital interfacing in industrial control and legacy system upgrades.
FAQ
What is the maximum operating supply voltage for the 74AC244SJX?
The 74AC244SJX supports a maximum supply voltage of +6.0V, with absolute maximum rating up to +7.0V. However, reliable operation is specified only within the recommended range of 2.0V to 6.0V. Exceeding 6.0V may cause parametric degradation or damage, and the device is not characterized for functionality above this limit. Always refer to the DC Electrical Characteristics table in the official 74AC244SJX datasheet for guaranteed performance boundaries.
Does the 74AC244SJX support 3.3V logic levels?
Yes, the 74AC244SJX fully supports 3.3V operation: its recommended VCC range includes 3.3V ±0.3V, input thresholds (VIH = 2.1V, VIL = 0.9V at VCC = 3.0V) provide adequate noise margin, and output swing (VOH ≥2.9V, VOL ≤0.5V at IOL = 24mA) meets 3.3V LVTTL requirements. The 74AC244SJX is commonly used in mixed 3.3V/5V systems where level translation and bus driving are needed.
How are the 3-STATE enable inputs configured on the 74AC244SJX?
The 74AC244SJX has two independent active-low 3-STATE enable inputs: OE1 controls outputs O0–O3 (pins 12, 14, 16, 18), and OE2 controls outputs O4–O7 (pins 3, 5, 7, 9). When either OE is HIGH, its associated four outputs enter high-impedance state; when LOW, outputs follow their respective inputs. This dual-enable architecture allows selective bus segmentation without external logic.
What package type does the 74AC244SJX use, and is it RoHS compliant?
The 74AC244SJX uses a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (M20D), with gull-wing leads and 1.27mm pitch. All packages, including the 74AC244SJX, are lead-free and comply with JEDEC J-STD-020B reflow standards. The device meets RoHS Directive 2011/65/EU requirements and carries no exemptions for lead content.
Can the 74AC244SJX replace the 74LS244 in existing designs?
The 74AC244SJX can functionally replace the 74LS244 in many cases due to matching pinout, 3-STATE behavior, and octal buffer function, but key differences require validation: 74AC244SJX draws far less supply current (µA vs mA), has CMOS input thresholds (not TTL), and offers higher output drive (±24mA vs ±15mA). Verify timing margins, input drive strength, and voltage compatibility before drop-in substitution - especially in legacy 5V-only systems with marginal noise immunity.
74AC244SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
74AC244SJX FAQ
1.How can I place an order for 74AC244SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC244SJX 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 74AC244SJX reliable?
The price and inventory of 74AC244SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC244SJX is usually 5 days.
3.What payment methods are accepted for 74AC244SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC244SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC244SJX?
74AC244SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC244SJX 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 74AC244SJX?
For technical support, including 74AC244SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC244SJX requirements.
6.How does Aetrix verify that 74AC244SJX is sourced from the original manufacturer or authorized distributors?
All 74AC244SJX 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 74AC244SJX meets industry standards.
7.What is the process for return or replacement of 74AC244SJX?
All 74AC244SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74AC244SJX, 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 74AC244SJX part is unused and in its original packaging.
Return procedure for 74AC244SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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