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onsemi 74LCX2244WM
- Part No.:
- 74LCX2244WM
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LCX2244WM.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,057
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Product details
Overview
74LCX2244WM from Fairchild Semiconductor is an 8-channel non-inverting 3-STATE buffer/line driver optimized for low-voltage (2.3V–3.6V) operation with 5V-tolerant I/O, 7.5 ns max propagation delay at VCC = 3.3V, ±12 mA output drive at 3.0V, and integrated 26Ω series output resistors to suppress overshoot/undershoot - used in memory address buffering and 3.3V-to-5V bus interfacing.
For engineers reviewing the 74LCX2244WM datasheet, pinout, applications, or equivalent options, key selection criteria include 5V I/O tolerance, 3-STATE enable control per half-bank (OE1/OE2), SOIC-20 package compatibility, output series termination, and industrial temperature range (−40°C to +85°C).
Technical Context
The 74LCX2244WM implements two independent 4-bit 3-STATE output banks (O0–O3 controlled by OE1; O4–O7 by OE2), each with CMOS input structure enabling 5V-tolerant operation across 2.3V–3.6V VCC. Its internal 26Ω series resistors are monolithically integrated into all eight outputs, reducing EMI and signal integrity issues without external components.
It features power-down high-impedance inputs/outputs, supports live insertion/withdrawal when OE is pulled up, and delivers ±12 mA sink/source capability at VCC = 3.0V. Latch-up immunity exceeds 500 mA and ESD withstands >2000V (HBM), meeting robust industrial interface requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - enables direct use in 2.5V/3.3V systems while maintaining 5V I/O compatibility |
| tPD Max | 7.5 ns at VCC = 3.3V, CL = 50 pF - ensures timing-critical bus driving with minimal latency |
| IOH/IOL | ±12 mA at VCC = 3.0V - drives standard TTL loads and short PCB traces without external buffers |
| Input Voltage Range | 0.0V to 5.5V - allows safe connection to 5V logic without level shifters |
| Output Series Resistor | 26Ω per output - damps ringing and reduces EMI on transmission lines |
| Operating Temp | −40°C to +85°C - qualified for industrial ambient environments |
| ICC Max | 10 µA quiescent - minimizes standby power in battery-sensitive or always-on subsystems |
Pinout & Package
74LCX2244WM is housed in a 20-lead SOIC package (JEDEC MS-013, 0.300" wide, Package Code M20B), with 1.27 mm pitch and standard gull-wing leads compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 10, 11, 13, 15 | I0–I7 Inputs | CMOS-compatible inputs accepting 0–5.5V; internally clamped for 5V tolerance |
| 3, 5, 7, 9 | OE2 (3-STATE Enable) | Active-Low enable for outputs O4–O7; must be pulled up during power sequencing |
| 12, 14, 16, 18 | OE1 (3-STATE Enable) | Active-Low enable for outputs O0–O3; independent control enables partial bus gating |
| 8, 17, 19, 20 | O0–O7 Outputs | Non-inverting buffered outputs with integrated 26Ω series resistor and 5V-tolerant 3-STATE |
| 19 | VCC | Primary supply pin (2.3–3.6V); decoupling required within 1 cm of pin |
| 10 | GND | Ground reference for all I/O and internal logic; dedicated return path recommended |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Enables direct interconnection between 3.3V logic and legacy 5V buses without external level translation |
| Dual independent OE controls | Allows selective 3-STATE control of two 4-bit output groups (O0–O3 and O4–O7), supporting split-bus architectures |
| Integrated 26Ω output resistors | Eliminates need for discrete series termination resistors, saving board space and improving signal integrity |
| Live insertion support | Guaranteed high-impedance state during power-up/down when OE is externally pulled up, preventing bus contention |
| Low dynamic noise | Patented EMI reduction circuitry lowers simultaneous switching noise, easing EMC compliance in dense layouts |
Applications
| Memory Address Buffering | 3.3V-to-5V Bus Interface |
|---|---|
Use Scenario: Driving address lines from a 3.3V microcontroller to a 5V SRAM or EPROM. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-STATE control, providing voltage-level bridging and fanout expansion. Use Value: Eliminates external level shifters while maintaining <7.5 ns propagation delay and 5V-safe outputs. |
Use Scenario: Interfacing a 3.3V FPGA I/O bank to a 5V peripheral bus (e.g., ISA, PCI-X legacy signals). IC Role / Device Role / Timing Role: Bidirectional-capable line driver with 5V-tolerant inputs and outputs, configured as unidirectional transmitter. Use Value: Supports hot-plug operation and prevents damage from 5V back-drive during configuration. |
| Clock Distribution | Industrial Control Backplane |
Use Scenario: Distributing a 3.3V system clock to multiple 5V-tolerant peripherals with matched skew. IC Role / Device Role / Timing Role: Low-skew (≤1.0 ns) non-inverting buffer with controlled edge rates and output damping. Use Value: Reduces clock jitter and overshoot via integrated 26Ω resistors, improving setup/hold margins. |
Use Scenario: Isolating and driving control signals (e.g., ENABLE, RESET, BUSY) across a noisy 24V industrial backplane interface. IC Role / Device Role / Timing Role: Robust 3-STATE buffer with >2000V HBM ESD rating and latch-up immunity >500 mA. Use Value: Survives repeated ESD events and ground bounce in factory-floor environments without protection diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC244APW | Lower VCC range (1.65–3.6V); no integrated series resistors; 3.5 ns tPD at 3.3V | Lacks built-in 26Ω termination - requires external resistors for EMI control on long traces | Preferred where speed >7.5 ns is critical and board layout allows discrete termination |
| SN74LVCH244A | Higher drive (±24 mA at 3.3V); 3.3V-only I/O (not 5V-tolerant); no integrated resistors | Cannot interface directly to 5V buses - mandates level-shifting circuitry for mixed-voltage systems | Chosen when higher current drive is needed and full 5V tolerance is not required |
Compared with 74LCX2244WM, the 74LVC244APW offers faster propagation but sacrifices integrated EMI suppression, while the SN74LVCH244A provides stronger drive yet forfeits 5V I/O compatibility - making 74LCX2244WM uniquely suited for cost-sensitive, mixed-voltage industrial interfaces requiring built-in signal integrity features.
Availability
74LCX2244WM is available at Aetrix Electronics and suitable for memory address buffering, 3.3V-to-5V bus interfacing, and industrial control backplane signal conditioning requiring stable component supply, long-term lifecycle support, and JEDEC-standard SOIC packaging.
Supply support for 74LCX2244WM 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 leading designer of high-performance analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The LCX family - including the 74LCX2244WM - was engineered specifically for low-voltage system interfacing with 5V tolerance, targeting memory subsystems, bus transceivers, and mixed-signal board-level integration.
FAQ
What is the maximum supply voltage for 74LCX2244WM?
The 74LCX2244WM is rated for VCC between 2.3V and 3.6V under normal operation. While absolute maximum VCC is +7.0V, sustained operation above 3.6V violates recommended conditions and may cause parametric failure or accelerated wear. Always maintain VCC within 2.3V–3.6V for guaranteed timing, drive strength, and 5V I/O tolerance behavior in the 74LCX2244WM.
Does 74LCX2244WM support true bidirectional data flow?
No, the 74LCX2244WM is a unidirectional non-inverting buffer with separate 3-STATE enable inputs (OE1/OE2) - it does not implement internal direction control or bus transceiver logic. For bidirectional operation, external control logic must manage input/output direction, or a dedicated transceiver like the 74LCX245 should be selected instead of the 74LCX2244WM.
Can 74LCX2244WM outputs be left floating when disabled?
No - when 74LCX2244WM outputs are in 3-STATE (OE = HIGH), they enter high-impedance mode but must still be terminated to prevent noise coupling or undefined logic states on shared buses. External pull-up/pull-down resistors (typically 10kΩ) are recommended on all 74LCX2244WM outputs in high-impedance configurations to ensure deterministic voltage levels.
Is the 26Ω series resistor in 74LCX2244WM internal or external?
The 26Ω series resistor is monolithically integrated into each output stage of the 74LCX2244WM - it is not an external component. This internal termination reduces PCB footprint, eliminates solder joint variability, and ensures consistent impedance matching across all eight channels, directly contributing to the 74LCX2244WM's specified overshoot/undershoot suppression.
What is the recommended pull-up resistor value for OE pins on 74LCX2244WM?
Fairchild specifies that OE pins on the 74LCX2244WM should be tied to VCC via a pull-up resistor whose minimum value depends on the current-sourcing capability of the driving source. For typical 3.3V CMOS drivers, a 4.7kΩ to 10kΩ resistor is recommended - ensuring reliable HIGH assertion during power-up while limiting current draw below 1 mA, as required for stable 3-STATE initialization of the 74LCX2244WM.
74LCX2244WM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
74LCX2244WM FAQ
1.How can I place an order for 74LCX2244WM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX2244WM 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 74LCX2244WM reliable?
The price and inventory of 74LCX2244WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX2244WM is usually 5 days.
3.What payment methods are accepted for 74LCX2244WM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX2244WM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX2244WM?
74LCX2244WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX2244WM 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 74LCX2244WM?
For technical support, including 74LCX2244WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX2244WM requirements.
6.How does Aetrix verify that 74LCX2244WM is sourced from the original manufacturer or authorized distributors?
All 74LCX2244WM 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 74LCX2244WM meets industry standards.
7.What is the process for return or replacement of 74LCX2244WM?
All 74LCX2244WM units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX2244WM, 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 74LCX2244WM part is unused and in its original packaging.
Return procedure for 74LCX2244WM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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