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onsemi 74LCX2244MTC
- Part No.:
- 74LCX2244MTC
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LCX2244MTC.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,057
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Product details
Overview
74LCX2244MTC from ON Semiconductor is an octal non-inverting 3-STATE buffer/line driver designed for low-voltage (2.3V–3.6V) VCC operation with 5V-tolerant inputs and outputs, 26Ω integrated output series resistors, 7.5 ns max propagation delay at 3.3V, and ±12 mA drive capability at 3.0V - used in memory address buffering, clock distribution, and bidirectional bus interfacing.
For engineers reviewing the 74LCX2244MTC datasheet, pinout, applications, or equivalent options, key selection criteria include 5V tolerance across mixed-voltage systems, TSSOP-20 package compatibility with high-density PCB layouts, 3-STATE control timing (tPZL/tPHZ ≤ 9.0 ns), and ESD robustness (>2000V HBM).
Technical Context
The 74LCX2244MTC implements dual independent 3-STATE enable controls (OE1 on pins 12/14/16/18; OE2 on pins 3/5/7/9), allowing grouped output control of two sets of four buffers. Its advanced CMOS process enables 2.3V–3.6V operation while maintaining full 5V signal interoperability on all I/O pins.
Each output integrates a 26Ω series resistor to suppress transmission-line reflections and reduce overshoot/undershoot in high-speed digital interfaces. The device supports live insertion/withdrawal when OE is pulled up to VCC, and exhibits latch-up immunity exceeding 500 mA per JEDEC JESD78.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports both 2.5V and 3.3V system rails without level shifters |
| tPD Max | 7.5 ns at VCC = 3.3V, CL = 50pF - enables reliable operation in sub-100 MHz bus environments |
| I/O Voltage Tolerance | −0.5V to +7.0V - allows direct connection to 5V logic without external clamping or translation |
| Output Drive | ±12 mA at VCC = 3.0V - sufficient to drive standard TTL loads and short PCB traces |
| Input Leakage | ±5.0 µA max - ensures minimal current draw on high-impedance control lines |
| Power-Down Current | 10 µA ICC max - maintains ultra-low quiescent power during 3-STATE mode |
| ESD Rating | Human Body Model > 2000V - meets industrial-grade robustness requirements |
Pinout & Package
74LCX2244MTC uses a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm body width, 0.65 mm lead pitch, and exposed pad not present - optimized for automated assembly and thermal performance in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 10, 11, 13 | Inputs (I0–I7) | Non-inverting data inputs; 5V tolerant, accept 0–5.5V swing regardless of VCC |
| 3, 5, 7, 9 | OE2 (3-STATE Enable Group 2) | Active-Low enable for outputs O0–O3; must be pulled HIGH via resistor during power transition |
| 12, 14, 16, 18 | OE1 (3-STATE Enable Group 1) | Active-Low enable for outputs O4–O7; independent control enables partial bus isolation |
| 15, 17, 19, 20, 19, 17, 15, 13 | Outputs (O0–O7) | Non-inverting buffered outputs with integrated 26Ω series resistor; drive ±12 mA at 3.0V |
| 20 | VCC | Positive supply pin; operates only within 2.3V–3.6V range despite 5V I/O tolerance |
| 10 | GND | Ground reference for all logic and output stages; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Enables seamless interface between 2.5V/3.3V logic domains and legacy 5V peripherals without external translators |
| Integrated 26Ω output resistors | Reduces signal integrity issues (overshoot/undershoot/ringing) on PCB traces up to ~10 cm without discrete termination |
| Dual independent 3-STATE enables | Allows selective disabling of two groups of four outputs - critical for multi-drop bus arbitration and hot-swap isolation |
| Live insertion support | Guaranteed high-impedance state during power ramp-up/down when OE is externally pulled to VCC |
| Low dynamic noise | Patented EMI reduction circuitry minimizes simultaneous switching noise (SSN) in dense memory or clock fanout applications |
Applications
| Memory Address Buffering | PCI/ISA Bus Interface |
|---|---|
|
Use Scenario: Driving address lines from a 3.3V microcontroller to multiple 5V SRAM chips in an embedded controller board. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-STATE control isolates address bus during memory read/write cycles and prevents contention. Use Value: 5V-tolerant outputs eliminate level-shifter ICs; 26Ω resistors suppress ringing on 8-inch PCB traces; tPZH ≤ 9.0 ns ensures setup time compliance with 33 MHz PCI timing. |
Use Scenario: Interfacing a 2.5V FPGA I/O bank to a legacy ISA expansion slot operating at 5V logic levels. IC Role / Device Role / Timing Role: Bidirectional line driver translating voltage domains while providing bus contention protection via 3-STATE control. Use Value: Dual OE groups allow independent control of data and address segments; ±12 mA drive sustains signal integrity across 12-inch backplane traces. |
| Low-Power Clock Distribution | Hot-Swappable Module Interface |
|
Use Scenario: Fanout of a 3.3V system clock to eight low-power peripherals in battery-operated instrumentation. IC Role / Device Role / Timing Role: Low-skew (tOSLH ≤ 1.0 ns) non-inverting buffer minimizing clock jitter across parallel paths. Use Value: 10 µA quiescent ICC extends battery life; 26Ω resistors dampen edge-induced EMI in sensitive analog sections. |
Use Scenario: Enabling safe insertion/removal of a mezzanine card into a powered-backplane carrier board. IC Role / Device Role / Timing Role: Isolation buffer with controlled 3-STATE entry/exit timing prevents bus glitches during connector mating. Use Value: Live-insertion support verified per Note 1; OE pull-up requirement ensures defined state during plug-in transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Single OE control (not dual), no integrated 26Ω resistors, 3.3V-only I/O tolerance (no 5V tolerance) | Requires external series resistors for signal integrity; limited to 3.3V-only systems | Select when cost sensitivity outweighs 5V tolerance and built-in termination needs |
| 74ALVC244MTCX | Higher speed (tPD = 3.3 ns), same dual-OE and 5V tolerance, but no integrated 26Ω resistors | Better for >100 MHz clock fanout; requires external termination for long traces | Choose for maximum timing margin where board layout permits discrete termination |
Compared with SN74LVC244APWR and 74ALVC244MTCX, the 74LCX2244MTC uniquely combines dual 3-STATE control, 5V I/O tolerance, and factory-integrated 26Ω termination - reducing BOM count and layout complexity in mixed-voltage industrial bus designs.
Availability
74LCX2244MTC is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, low-power clock distribution networks, and hot-pluggable module interfaces requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for 74LCX2244MTC 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 leader in intelligent power and sensing solutions, delivering energy-efficient semiconductor components for automotive, industrial, cloud computing, and IoT applications.
The 74LCX2244MTC belongs to the LCX low-voltage logic family, engineered specifically for mixed-signal systems requiring 5V-compatible interfacing at 2.5V/3.3V core voltages - targeting high-reliability industrial control and communications infrastructure.
FAQ
What is the maximum recommended VCC voltage for 74LCX2244MTC?
The 74LCX2244MTC is rated for VCC operation from 2.3V to 3.6V. Exceeding 3.6V violates the Recommended Operating Conditions and risks parametric degradation or reliability failure. Absolute maximum VCC is +7.0V, but this is a stress rating only - sustained operation above 3.6V is not functional or guaranteed. Always verify VCC stability within 2.3V–3.6V for correct 74LCX2244MTC behavior.
Does 74LCX2244MTC support true 5V logic-level inputs when powered at 2.5V?
Yes - the 74LCX2244MTC guarantees 5V-tolerant inputs across its full VCC range (2.3V–3.6V). When powered at 2.5V, it accepts VI from 0V to 5.5V without damage or undefined states. This is confirmed by the DC Electrical Characteristics table specifying VI = 0.0–5.5V and absolute maximum VI = −0.5V to +7.0V. No external clamping is needed for 5V signals driving 74LCX2244MTC.
How are the two 3-STATE enable inputs (OE1 and OE2) assigned to outputs on 74LCX2244MTC?
OE1 (pins 12, 14, 16, 18) controls outputs O4–O7, while OE2 (pins 3, 5, 7, 9) controls outputs O0–O3. This grouping enables independent bus segment control - for example, disabling address bits A4–A7 while keeping A0–A3 active. Both OE inputs are active-low; pulling either high places its associated outputs in high-impedance state. This mapping is explicitly defined in the Pin Descriptions and Truth Tables of the 74LCX2244MTC datasheet.
Can 74LCX2244MTC be used without external pull-up resistors on OE pins?
No - per Note 1 in the 74LCX2244MTC datasheet, OE pins must be tied to VCC through a pull-up resistor to ensure high-impedance state during power-up/down transitions. Without this, outputs may briefly drive unintended logic states, risking bus contention. The minimum resistor value depends on the driver's sourcing capability; typical values range from 4.7kΩ to 10kΩ. Leaving OE floating is strictly prohibited.
What is the purpose of the 26Ω series resistors integrated in each output of 74LCX2244MTC?
The 26Ω series resistors in each 74LCX2244MTC output are designed to dampen signal reflections on PCB traces, reducing overshoot, undershoot, and ringing - especially in unterminated or moderately loaded transmission lines up to ~10 cm. They lower the effective edge rate without compromising propagation delay, improving EMI performance and signal integrity in high-speed digital interfaces like memory buses and clock distribution networks.
74LCX2244MTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 12mA, 12mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LCX2244MTC FAQ
1.How can I place an order for 74LCX2244MTC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX2244MTC 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 74LCX2244MTC reliable?
The price and inventory of 74LCX2244MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX2244MTC is usually 5 days.
3.What payment methods are accepted for 74LCX2244MTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX2244MTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX2244MTC?
74LCX2244MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX2244MTC 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 74LCX2244MTC?
For technical support, including 74LCX2244MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX2244MTC requirements.
6.How does Aetrix verify that 74LCX2244MTC is sourced from the original manufacturer or authorized distributors?
All 74LCX2244MTC 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 74LCX2244MTC meets industry standards.
7.What is the process for return or replacement of 74LCX2244MTC?
All 74LCX2244MTC units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX2244MTC, 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 74LCX2244MTC part is unused and in its original packaging.
Return procedure for 74LCX2244MTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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