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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi 74LCX2244MTCX

Name: 74LCX2244MTCX
Brand: onsemi
SKU: 74LCX2244MTCX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCX2244MTCX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74LCX2244MTCX.pdf

Description:: IC BUF NON-INVERT 3.6V 20TSSOP

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Product details

Overview

74LCX2244MTCX from ON Semiconductor is an octal non-inverting 3-STATE buffer/line driver designed for low-voltage (2.3V–3.6V) bus interface 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 in high-speed digital systems.

For engineers reviewing the 74LCX2244MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V-tolerant I/O compatibility with mixed-voltage systems, TSSOP-20 package footprint, guaranteed 3-STATE timing (tPZL/tPHZ ≤ 9.0 ns), and ESD robustness (>2000V HBM).

Technical Context

The 74LCX2244MTCX implements dual independent 3-STATE enable controls (OE1, OE2) driving eight non-inverting outputs (O0–O7) from eight inputs (I0–I7), supporting simultaneous or segmented bus control. Its CMOS process delivers rail-to-rail 5V-tolerant input thresholds (VIH = 2.0V min at VCC ≥ 2.7V) and output voltage compliance (VOH ≥ VCC − 0.2V, VOL ≤ 0.8V at 12 mA).

AC performance is characterized across VCC = 2.5V, 2.7V, and 3.3V with CL = 30–50 pF loads; propagation delay skew between any two outputs is limited to 1.0 ns, and dynamic noise metrics (VOLP = 0.35V, VOLV = −0.35V at 3.3V) confirm its suitability for noise-sensitive data paths.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.3V to 3.6V - Enables direct operation from 2.5V or 3.3V logic rails without level translation.
Input/Output Voltage Tolerance	0V to 5.5V - Allows safe interfacing with legacy 5V peripherals without external clamping or translators.
tPD Max	7.5 ns at VCC = 3.3V, CL = 50 pF - Supports >100 MHz bus toggle rates in memory or clock distribution paths.
IOH/IOL	±12 mA at VCC = 3.0V - Drives standard TTL or CMOS loads across full industrial temperature range (−40°C to +85°C).
Output Series Resistance	26Ω - Integrated resistor reduces signal reflections and EMI on PCB traces up to 10 cm in length.
ICC Quiescent	10 µA max - Minimizes standby power in battery-backed or always-on subsystems.
ESD Rating	2000V HBM - Meets JEDEC JS-001-2017 for robust handling in automated assembly environments.

Pinout & Package

74LCX2244MTCX is packaged in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm body width, 0.65 mm lead pitch, with exposed pad optional per MTC20 mechanical drawing.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 6, 8, 10, 13, 15	I0–I7 Inputs	Non-inverting data inputs; 5V-tolerant, ≤7 pF capacitance, compatible with LVTTL/LVCMOS swing.
3, 5, 7, 9	OE2 Group Enable	Active-Low 3-STATE control for outputs O0–O3; must be pulled HIGH via resistor during power-up for safe Hi-Z.
12, 14, 16, 18	OE1 Group Enable	Active-Low 3-STATE control for outputs O4–O7; independent timing from OE2 enables split-bus gating.
11, 17, 19, 20	O0–O7 Outputs	Buffered non-inverting outputs with 26Ω series resistance; drive ±12 mA, support live insertion.
19, 20	VCC / GND	Single power supply pin (19) and ground pin (20); decoupling capacitor required within 5 mm of pin 19.

Key Features

Feature	Design Value
5V-tolerant I/O	Enables direct connection to 5V microcontrollers, FPGAs, or legacy peripherals without external level shifters.
Dual independent 3-STATE enables	Allows selective disabling of upper/lower four outputs (O4–O7 vs. O0–O3) for partial bus isolation or power gating.
Integrated 26Ω output series resistors	Eliminates need for discrete series termination resistors, reducing BOM count and PCB area in high-density layouts.
Live insertion/withdrawal support	Guaranteed high-impedance state during hot-plug events when OE pins are externally pulled up, preventing bus contention.
Low dynamic noise (VOLP/VOLV)	Peak quiet-output noise limited to ±0.35V at 3.3V - critical for maintaining signal integrity in mixed-signal SoC interfaces.

Applications

Memory Address Buffering	Low-Voltage Clock Distribution
Use Scenario: Driving address lines from a 3.3V microcontroller to a 5V SRAM or Flash memory device in embedded instrumentation. IC Role / Device Role / Timing Role: Non-inverting buffer with 5V-tolerant outputs ensures reliable address latching without level-shifter delay or skew. Use Value: Eliminates external translation circuitry while maintaining <7.5 ns propagation delay and <1 ns inter-output skew for synchronous access timing.	Use Scenario: Distributing a 3.3V system clock to multiple 5V-tolerant peripherals (e.g., ADCs, DACs, UARTs) in industrial PLC modules. IC Role / Device Role / Timing Role: Low-skew line driver with 26Ω series resistors minimizes clock edge distortion and EMI radiation on shared routing. Use Value: Delivers clean, impedance-matched clock edges across 8 destinations with no additional termination components required.
PCI/ISA Bus Interface	Hot-Swappable Backplane Driver
Use Scenario: Interfacing a 2.5V FPGA I/O bank to a 5V PCI slot in legacy test equipment upgrade designs. IC Role / Device Role / Timing Role: Bidirectional-compatible buffer (via 3-STATE control) translates voltage levels while preserving setup/hold timing margins. Use Value: Supports full PCI 33 MHz timing budget with tPLZ/tPHZ ≤ 8.4 ns and guaranteed 5V I/O tolerance during bus arbitration.	Use Scenario: Enabling hot-swap capability in modular telecom line cards where daughterboards connect/disconnect under power. IC Role / Device Role / Timing Role: Dual-OE architecture allows controlled sequencing: disable one group before inserting/removing, then re-enable. Use Value: Prevents bus contention and supply rail droop during insertion by ensuring Hi-Z state prior to physical mating of connectors.

Memory Address Buffering

Low-Voltage Clock Distribution

Use Scenario: Driving address lines from a 3.3V microcontroller to a 5V SRAM or Flash memory device in embedded instrumentation.

IC Role / Device Role / Timing Role: Non-inverting buffer with 5V-tolerant outputs ensures reliable address latching without level-shifter delay or skew.

Use Value: Eliminates external translation circuitry while maintaining <7.5 ns propagation delay and <1 ns inter-output skew for synchronous access timing.

Use Scenario: Distributing a 3.3V system clock to multiple 5V-tolerant peripherals (e.g., ADCs, DACs, UARTs) in industrial PLC modules.

IC Role / Device Role / Timing Role: Low-skew line driver with 26Ω series resistors minimizes clock edge distortion and EMI radiation on shared routing.

Use Value: Delivers clean, impedance-matched clock edges across 8 destinations with no additional termination components required.

PCI/ISA Bus Interface

Hot-Swappable Backplane Driver

Use Scenario: Interfacing a 2.5V FPGA I/O bank to a 5V PCI slot in legacy test equipment upgrade designs.

IC Role / Device Role / Timing Role: Bidirectional-compatible buffer (via 3-STATE control) translates voltage levels while preserving setup/hold timing margins.

Use Value: Supports full PCI 33 MHz timing budget with tPLZ/tPHZ ≤ 8.4 ns and guaranteed 5V I/O tolerance during bus arbitration.

Use Scenario: Enabling hot-swap capability in modular telecom line cards where daughterboards connect/disconnect under power.

IC Role / Device Role / Timing Role: Dual-OE architecture allows controlled sequencing: disable one group before inserting/removing, then re-enable.

Use Value: Prevents bus contention and supply rail droop during insertion by ensuring Hi-Z state prior to physical mating of connectors.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC244APW,118	Single OE control (not dual), 3.3V-only I/O (no 5V tolerance), 3.5 ns tPD typical at 3.3V.	Suitable only in pure 3.3V systems; requires external clamping for 5V interface.	Select when lowest propagation delay is prioritized and voltage domain is strictly 3.3V.
SN74AVC8T245RHLR	Configurable direction control, auto-bidirectional mode, 1.65V–3.6V VCC, but no integrated series resistors.	Used in bidirectional data buses (e.g., I²C, SMBus); lacks fixed 26Ω termination for unidirectional clock/address paths.	Select when bus direction flexibility is needed, but add external 26Ω resistors if signal integrity demands match.

Compared with 74LVC244APW,118 and SN74AVC8T245RHLR, the 74LCX2244MTCX uniquely combines dual 3-STATE enables, native 5V I/O tolerance, and factory-integrated 26Ω output resistors-making it optimal for unidirectional, mixed-voltage, noise-critical buffering where layout simplicity and reliability are design priorities.

Availability

74LCX2244MTCX is available at Aetrix Electronics and suitable for memory address buffering, low-voltage clock distribution, and hot-swappable backplane driver applications requiring stable component supply, long-term lifecycle assurance, and consistent TSSOP-20 packaging.

Supply support for 74LCX2244MTCX 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 is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, cloud computing, and IoT applications.

The 74LCX2244MTCX belongs to the LCX family of low-voltage, 5V-tolerant logic devices engineered for seamless interoperability between legacy 5V and modern sub-3.3V digital systems in space-constrained industrial and communications hardware.

FAQ

What is the maximum operating voltage for 74LCX2244MTCX inputs and outputs?

The 74LCX2244MTCX supports DC input and output voltages from −0.5V to +7.0V absolute maximum, with recommended 5V-tolerant operation from 0V to 5.5V. This allows safe interfacing with 5V signals while powered from 2.3V–3.6V VCC, eliminating external clamping diodes in mixed-voltage designs. The 74LCX2244MTCX maintains this tolerance across its full −40°C to +85°C operating range without derating.

Does 74LCX2244MTCX require external pull-up resistors on OE pins?

Yes - to ensure high-impedance outputs during power-up or power-down transitions, OE1 and OE2 must be tied to VCC through external pull-up resistors. The minimum resistor value depends on the current-sourcing capability of the driving source; Fairchild's datasheet specifies this requirement explicitly for safe live-insertion behavior. This design rule applies directly to the 74LCX2244MTCX in all TSSOP-based implementations.

Can 74LCX2244MTCX drive standard TTL loads?

Yes - the 74LCX2244MTCX delivers ±12 mA output drive at VCC = 3.0V, exceeding the ±0.4 mA sink/source requirements of standard TTL inputs. Its VOH ≥ 2.4V and VOL ≤ 0.55V at 6 mA meet TTL voltage thresholds, enabling direct fan-out to up to 10 standard TTL loads without buffering. This capability is verified for the 74LCX2244MTCX across its full specified VCC and temperature range.

What is the purpose of the 26Ω series resistors in 74LCX2244MTCX outputs?

The 26Ω series resistors integrated into each 74LCX2244MTCX output reduce signal overshoot and undershoot by matching typical PCB trace impedances (≈50Ω single-ended), thereby minimizing reflections and EMI. These resistors are factory-trimmed and do not require external components - a key differentiator confirmed in the 74LCX2244MTCX datasheet's General Description and Features sections.

Is 74LCX2244MTCX pin-compatible with other LCX2244 variants?

Yes - the 74LCX2244MTCX shares identical pin assignments with other LCX2244 packages (SOIC, SSOP, SOP, DQFN) per the JEDEC-standardized 20-pin logic layout shown in the datasheet's Connection Diagrams. Pin functions (I0–I7, O0–O7, OE1/OE2, VCC, GND) and spacing are consistent across all variants, enabling drop-in replacement solely based on package preference - a documented feature of the entire LCX2244 family including the 74LCX2244MTCX.

74LCX2244MTCX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCX

Package/Case:: 20-TSSOP (0.173", 4.40mm 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:: 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

74LCX2244MTCX FAQ

1.How can I place an order for 74LCX2244MTCX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCX2244MTCX 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 74LCX2244MTCX reliable?

The price and inventory of 74LCX2244MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX2244MTCX is usually 5 days.

3.What payment methods are accepted for 74LCX2244MTCX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX2244MTCX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCX2244MTCX?

74LCX2244MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCX2244MTCX 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 74LCX2244MTCX?

For technical support, including 74LCX2244MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX2244MTCX requirements.

6.How does Aetrix verify that 74LCX2244MTCX is sourced from the original manufacturer or authorized distributors?

All 74LCX2244MTCX 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 74LCX2244MTCX meets industry standards.

7.What is the process for return or replacement of 74LCX2244MTCX?

All 74LCX2244MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX2244MTCX, 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 74LCX2244MTCX part is unused and in its original packaging.

Return procedure for 74LCX2244MTCX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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