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onsemi 74FR244SJ
- Part No.:
- 74FR244SJ
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74FR244SJ.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,481
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Product details
Overview
74FR244SJ from Fairchild Semiconductor is a non-inverting octal buffer/line driver with 3-STATE outputs, designed for memory address driving, clock distribution, and bus-oriented transmitter/receiver functions. It operates from +4.5V to +5.5V, sinks up to 64 mA per output, sources 15 mA, and guarantees pin-to-pin skew of ≤1.6 ns (HL) and ≤1.0 ns (LH) at VCC = 5.0V, CL = 50 pF.
For engineers reviewing the 74FR244SJ datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing (tPZH ≤ 6.6 ns), output drive strength (IOL = 64 mA), input voltage thresholds (VIH = 2.0 V, VIL = 0.8 V), and EIAJ TYPE II SOP-20 package compatibility.
Technical Context
The 74FR244SJ implements dual independent 4-bit non-inverting buffers, each controlled by an active-low output enable (–OE1, –OE2). All eight outputs switch synchronously with guaranteed skew, supporting high-speed bus interface where timing alignment across multiple lines is critical.
It uses TTL-compatible input thresholds and delivers rail-to-rail CMOS-level outputs under load. The device meets JEDEC MS-001 and EIAJ TYPE II mechanical standards, with absolute maximum ratings including VCC = −0.5V to +7.0V and junction temperature up to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | +4.5V to +5.5V - Ensures compatibility with standard 5V TTL/CMOS systems and noise margin stability |
| IOL / IOH | 64 mA sink / 15 mA source - Supports direct drive of heavy capacitive buses or multiple TTL inputs |
| tPLH / tPHL | 1.0–3.9 ns - Enables sub-4 ns propagation delay for high-frequency address or data strobing |
| tPZH / tPHZ | 2.5–6.6 ns enable/disable - Allows precise bus arbitration timing in shared-memory architectures |
| tOSLH / tOSHL | ≤1.0 ns / ≤1.6 ns skew - Guarantees simultaneous edge alignment across all 8 outputs for clean bus transitions |
| VIH / VIL | 2.0 V / 0.8 V - Matches standard TTL logic thresholds for seamless interfacing without level shifters |
| ICCZ (3-STATE) | 35–50 mA - Defines quiescent supply current when outputs are disabled, critical for power budgeting |
Pinout & Package
74FR244SJ is housed in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M20D), with gull-wing leads and standard 0.5 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 13, 15, 17, 19 | I0–I7 (Inputs) | Non-inverting data inputs; accept TTL/CMOS logic levels; drive internal buffer stages |
| 3, 5, 7, 9 | –OE2 (Active-Low Output Enable) | Controls outputs O0–O3; LOW enables, HIGH places in high-impedance state |
| 12, 14, 16, 18 | –OE1 (Active-Low Output Enable) | Controls outputs O4–O7; independent enable allows split-bus control |
| 11, 10, 9, 8, 7, 6, 5, 4 | O0–O7 (Outputs) | 3-STATE CMOS outputs; capable of sinking 64 mA or sourcing 15 mA into loads |
| 20 | VCC | Positive supply pin; must be decoupled locally to suppress switching noise |
| 10 | GND | Ground reference for all I/O and internal circuitry; requires low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit enables | –OE1 and –OE2 allow separate control of upper/lower nibbles for flexible bus partitioning |
| Guaranteed pin-to-pin skew | tOSLH ≤ 1.0 ns ensures deterministic timing across all 8 outputs in synchronous applications |
| High-current 3-STATE outputs | 64 mA sink capability supports direct interface to unterminated transmission lines or legacy TTL loads |
| TTL-compatible input thresholds | VIH = 2.0 V and VIL = 0.8 V enable plug-and-play integration with 5V microcontrollers and FPGAs |
| Low propagation delay | tPLH/tPHL ≤ 3.9 ns at CL = 50 pF permits use in >200 MHz address/data strobe paths |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or EPROM in embedded control systems. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-STATE control isolates CPU during DMA cycles and prevents bus contention. Use Value: Guaranteed skew ≤1.6 ns ensures simultaneous arrival of all address bits, eliminating setup/hold violations at memory inputs. | Use Scenario: Distributing a system clock signal to multiple peripheral ICs with matched edge timing. IC Role / Device Role / Timing Role: Low-skew line driver delivering clean, synchronized clock edges to multiple receivers. Use Value: tOSLH ≤1.0 ns minimizes clock skew across destinations, preserving timing margins in synchronous peripherals. |
| Bus Transceiver Interface | Legacy System Bus Expansion |
Use Scenario: Bidirectional data bus isolation between processor and external I/O peripherals using external direction control. IC Role / Device Role / Timing Role: Unidirectional 3-STATE driver used in pairs to emulate transceiver behavior on shared data lines. Use Value: Fast tPZH ≤6.6 ns and tPHZ ≤6.4 ns enable rapid bus turnaround for burst-mode transfers. | Use Scenario: Adding parallel I/O expansion to industrial PLCs using ISA-style backplane interfaces. IC Role / Device Role / Timing Role: High-drive buffer translating logic signals to longer traces with 64 mA sink capability. Use Value: IOL = 64 mA sustains signal integrity over 10+ inch PCB traces loaded with multiple TTL inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74F244SCX | Fast TTL version; higher ICC (ICCL up to 110 mA), no guaranteed skew spec | Limited suitability for skew-critical clock distribution; better for general-purpose buffering | Choose when lower cost and wider availability outweigh skew requirements |
| SN74LVC244APWR | 3.3V-only operation (1.65–3.6V); lower drive (24 mA sink), smaller TSSOP-20 package | Not compatible with 5V systems; requires level translation if interfacing with legacy 5V logic | Prefer for new 3.3V designs prioritizing space and power efficiency over 5V interoperability |
Compared with 74FR244SJ, the 74F244SCX offers faster raw speed but lacks skew guarantees, while SN74LVC244APWR reduces voltage and footprint at the cost of 5V compatibility and drive strength-making 74FR244SJ optimal for legacy 5V bus systems requiring deterministic timing.
Availability
74FR244SJ is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and bus-oriented transmitter/receiver applications requiring stable component supply and long-term industrial availability.
Supply support for 74FR244SJ 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and discrete power products, acquired by ON Semiconductor in 2016.
The 74FR244SJ belongs to Fairchild's FR-series high-speed TTL-compatible logic family, engineered for low-skew, high-drive 5V bus interface applications in industrial and computing systems.
FAQ
What is the operating voltage range for the 74FR244SJ?
The 74FR244SJ operates from +4.5V to +5.5V. This range ensures reliable compatibility with standard 5V TTL and CMOS logic families while maintaining adequate noise margin. Operation outside this range may cause functional failure or permanent damage, as specified in the Absolute Maximum Ratings table.
Does the 74FR244SJ support true bidirectional data flow?
No, the 74FR244SJ is a unidirectional non-inverting buffer. It has separate input (I0–I7) and output (O0–O7) pins with no internal direction control. Bidirectional operation requires external logic or pairing two 74FR244SJ devices with complementary enable signals.
What is the meaning of "guaranteed pin-to-pin skew" in the 74FR244SJ datasheet?
Guaranteed pin-to-pin skew means the maximum time difference between any two output transitions (e.g., O0 and O7) is bounded: tOSLH ≤ 1.0 ns for LOW-to-HIGH and tOSHL ≤ 1.6 ns for HIGH-to-LOW. This specification is measured under defined conditions (VCC = 5.0V, CL = 50 pF, TA = 0°C to +70°C) and ensures deterministic timing across all eight outputs in the 74FR244SJ.
Can the 74FR244SJ be used in place of a 74LS244 in existing designs?
Yes, the 74FR244SJ is a drop-in replacement for the 74LS244 in most 5V systems due to identical pinout, function, and TTL-compatible thresholds. However, it delivers significantly higher output drive (64 mA vs. 24 mA for LS) and faster propagation (≤3.9 ns vs. ≤25 ns), which may require verifying trace loading and power delivery in legacy layouts.
What package type does the 74FR244SJ use, and is it RoHS-compliant?
The 74FR244SJ uses a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M20D). As a pre-2006 Fairchild product, it predates RoHS enforcement; leaded solder versions were standard. RoHS-compliant equivalents are not available under this exact part number, but modern alternatives like SN74LVC244A offer compliant packaging.
74FR244SJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74FR
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
74FR244SJ FAQ
1.How can I place an order for 74FR244SJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FR244SJ 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 74FR244SJ reliable?
The price and inventory of 74FR244SJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FR244SJ is usually 5 days.
3.What payment methods are accepted for 74FR244SJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FR244SJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FR244SJ?
74FR244SJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FR244SJ 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 74FR244SJ?
For technical support, including 74FR244SJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FR244SJ requirements.
6.How does Aetrix verify that 74FR244SJ is sourced from the original manufacturer or authorized distributors?
All 74FR244SJ 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 74FR244SJ meets industry standards.
7.What is the process for return or replacement of 74FR244SJ?
All 74FR244SJ units undergo pre-shipment inspection (PSI). If there is an issue with 74FR244SJ, 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 74FR244SJ part is unused and in its original packaging.
Return procedure for 74FR244SJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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