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

Toshiba Semiconductor and Storage TC74LCX244FTELM

Name: TC74LCX244FTELM
Brand: Toshiba Semiconductor and Storage
SKU: TC74LCX244FTELM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TC74LCX244FTELM

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: TC74LCX244FTELM.pdf

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

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Product details

Overview

TC74LCX244FTELM from Toshiba Electronic Devices & Storage Corporation is a low-voltage octal non-inverting 3-state bus buffer with dual active-low output enables, designed for 3.3-V systems while supporting 5-V tolerant inputs and outputs. It delivers 6.5 ns max propagation delay at VCC = 3.3 V, ±24 mA output drive, and operates across 1.65–3.6 V supply range-used in memory address driver interfaces between mixed-voltage logic domains.

For engineers reviewing the TC74LCX244FTELM datasheet, TC74LCX244FTELM pinout, TC74LCX244FTELM application, or TC74LCX244FTELM equivalent, key selection considerations include 5-V tolerance on all I/Os, dual independent output enable control, guaranteed tpd ≤ 6.5 ns at 3.3 V, 3-state leakage < ±5 µA, and JEITA SOP-20 package compatibility with legacy 74-series footprints.

Technical Context

The TC74LCX244FTELM implements two independent 4-bit non-inverting buffer sections, each controlled by its own active-low output enable (OE1, OE2), enabling selective tri-state control of A1–A4 and A5–A8 groups. Its CMOS design ensures rail-to-rail input thresholds scalable with VCC and supports hot-swap capable 5-V tolerant I/Os without external level shifters.

All inputs feature diode-based ESD protection and power-down protection circuitry that maintains high-impedance state during VCC = 0 V. The device complies with JEDEC JESD8-5 for 3.3-V operation and meets JEITA standard SOP-20 mechanical dimensions (300-mil body, 1.27-mm pitch).

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	1.65 V to 3.6 V - Enables direct integration into 3.3-V core logic while maintaining full functionality down to 1.65 V for low-power modes.
tpd (max)	6.5 ns at VCC = 3.3 V - Ensures timing closure in high-speed address/data bus applications up to ~150 MHz system clock domains.
IOL / IOH	±24 mA at VCC = 3.0 V - Drives standard TTL loads and multiple CMOS inputs without buffering; supports fan-out ≥ 10.
Input/Output Voltage Tolerance	0 V to 5.5 V - Allows safe interfacing with 5-V peripherals (e.g., legacy microcontrollers, EEPROMs) without level-shifting components.
IOZ (Off-State Leakage)	< ±5 µA - Minimizes signal contention and power loss when outputs are disabled in large bus systems.
Operating Temperature	−40 °C to +85 °C - Qualified for industrial-grade embedded control and communications equipment environments.
CIN / COUT	7 pF / 8 pF at VCC = 3.3 V - Low capacitive loading preserves signal integrity and reduces switching noise on shared buses.

Pinout & Package

TC74LCX244FTELM is packaged in JEITA-standard SOP-20 (300-mil body, 1.27-mm lead pitch), designated as SOP20-P-300-1.27A per Toshiba documentation. This surface-mount package supports reflow soldering and is compatible with automated PCB assembly.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2 (Active-Low Output Enables)	Independent control of first and second 4-bit buffer groups; both must be low for corresponding Y outputs to drive.
2–5, 13–16	A1–A4, A5–A8 (Inputs)	Eight buffered data/address inputs; 5-V tolerant, ESD-protected, with VIH/VIL thresholds scaling with VCC.
6–9, 11–14	Y1–Y4, Y5–Y8 (Outputs)	Non-inverting 3-state outputs; sink/source ±24 mA; high-impedance when respective OE is high.
10	GND	Ground reference for all internal circuitry and I/O stages; requires low-impedance PCB connection.
20	VCC	Primary power supply (1.65–3.6 V); decoupling capacitor (0.1 µF ceramic) required adjacent to pin.

Key Features

Feature	Design Value
5-V Tolerant I/Os	Supports direct connection to 5-V logic without external level translators-reduces BOM count and board space in mixed-voltage systems.
Dual Independent Output Enables	Enables selective isolation of two 4-bit data lanes (e.g., upper/lower memory banks or peripheral address segments) within one IC.
Low Quiescent ICC	< 10 µA typical - Minimizes standby current in battery-backed or always-on subsystems such as real-time clocks or watchdog controllers.
Power-Down Protection	Maintains high-impedance outputs and prevents back-driving when VCC = 0 V - critical for hot-plug and partial-power-down architectures.
PIN-Compatible with 74-Series	Direct drop-in replacement for 74AC244, 74HC244, and 74LS244 in SOP-20 footprint - simplifies legacy design upgrades and obsolescence mitigation.

Applications

Memory Address Buffering	Industrial PLC I/O Expansion
Use Scenario: Driving 16-bit address lines from a 3.3-V microcontroller to external 5-V SRAM or Flash memory. IC Role / Device Role / Timing Role: Non-inverting 3-state bus buffer providing voltage-level translation and load isolation between core logic and memory subsystem. Use Value: Eliminates need for discrete level shifters; 6.5 ns tpd ensures setup/hold timing compliance with 55-ns access time memories.	Use Scenario: Interfacing a 3.3-V FPGA I/O bank to legacy 5-V digital input modules in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer isolating field-side signals from logic-side processing units. Use Value: Enables interoperability with existing 5-V sensor/actuator modules while preserving FPGA I/O voltage safety margins.
Embedded Communication Bus Isolation	Test Equipment Signal Conditioning
Use Scenario: Segmenting a shared SPI or parallel control bus between multiple 3.3-V peripherals operating at different power states. IC Role / Device Role / Timing Role: Selectively enabled buffer controlling signal flow direction and preventing bus contention during sleep/wake transitions. Use Value: Dual OE pins allow independent gating of two 4-bit channels-supports dynamic power management without software overhead.	Use Scenario: Conditioning digital stimulus signals from a 3.3-V pattern generator before driving 5-V DUT inputs in automated test fixtures. IC Role / Device Role / Timing Role: High-speed, low-skew buffer ensuring clean edge integrity and precise timing alignment across multiple DUT channels. Use Value: 1.0 ns max output skew at 3.3 V guarantees synchronized signal delivery across eight parallel test paths.

Memory Address Buffering

Industrial PLC I/O Expansion

Use Scenario: Driving 16-bit address lines from a 3.3-V microcontroller to external 5-V SRAM or Flash memory.

IC Role / Device Role / Timing Role: Non-inverting 3-state bus buffer providing voltage-level translation and load isolation between core logic and memory subsystem.

Use Value: Eliminates need for discrete level shifters; 6.5 ns tpd ensures setup/hold timing compliance with 55-ns access time memories.

Use Scenario: Interfacing a 3.3-V FPGA I/O bank to legacy 5-V digital input modules in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer isolating field-side signals from logic-side processing units.

Use Value: Enables interoperability with existing 5-V sensor/actuator modules while preserving FPGA I/O voltage safety margins.

Embedded Communication Bus Isolation

Test Equipment Signal Conditioning

Use Scenario: Segmenting a shared SPI or parallel control bus between multiple 3.3-V peripherals operating at different power states.

IC Role / Device Role / Timing Role: Selectively enabled buffer controlling signal flow direction and preventing bus contention during sleep/wake transitions.

Use Value: Dual OE pins allow independent gating of two 4-bit channels-supports dynamic power management without software overhead.

Use Scenario: Conditioning digital stimulus signals from a 3.3-V pattern generator before driving 5-V DUT inputs in automated test fixtures.

IC Role / Device Role / Timing Role: High-speed, low-skew buffer ensuring clean edge integrity and precise timing alignment across multiple DUT channels.

Use Value: 1.0 ns max output skew at 3.3 V guarantees synchronized signal delivery across eight parallel test paths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal non-inverting 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC244APW,118	Lower VCC min (1.65 V same), but only 5-V tolerant inputs (not outputs); tpd = 5.2 ns @ 3.3 V.	Requires external clamping or series resistors for 5-V output driving; unsuitable for bidirectional 5-V bus termination.	Select when only input-level translation is needed and output loads remain ≤3.3 V.
SN74LVCH244AQPWRQ1	Automotive-grade (AEC-Q100), same 5-V I/O tolerance, tpd = 6.7 ns @ 3.3 V, higher ICC (20 µA typ).	Qualified for under-hood automotive ECUs; includes enhanced ESD (±8 kV HBM) and extended temperature range (−40 °C to +125 °C).	Select for automotive applications requiring qualification beyond industrial temperature limits.

Compared with TC74LCX244FTELM, the 74LVC244APW offers faster speed but lacks 5-V output tolerance-limiting use in true mixed-voltage driving scenarios-while the SN74LVCH244AQPWRQ1 adds automotive reliability at the cost of higher static current and slightly slower propagation.

Availability

TC74LCX244FTELM is available at Aetrix Electronics and suitable for industrial automation, embedded memory expansion, and mixed-voltage communication interface designs requiring stable component supply, long-term lifecycle support, and JEDEC-compliant packaging.

Supply support for TC74LCX244FTELM 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

Toshiba Electronic Devices & Storage Corporation is a global semiconductor manufacturer specializing in power devices, logic ICs, and storage solutions, with over 50 years of analog and digital IC design heritage.

The TC74LCX series was developed to bridge 3.3-V logic systems with legacy 5-V infrastructure-delivering high-speed, low-power, and robust voltage-tolerant buffering for industrial and computing applications.

FAQ

What is the maximum operating frequency supported by TC74LCX244FTELM?

The TC74LCX244FTELM does not specify a maximum clock frequency directly, but its 6.5 ns maximum propagation delay at VCC = 3.3 V implies reliable operation in systems with signal periods ≥13 ns (i.e., ≤77 MHz fundamental timing margin). Actual usable frequency depends on bus loading, PCB layout, and system-level timing constraints-not internal clocking.

Does TC74LCX244FTELM support hot-swap or live-insertion?

Yes, TC74LCX244FTELM supports hot-swap operation due to its power-down protection circuitry: when VCC = 0 V, all inputs and outputs enter high-impedance state with leakage < ±10 µA, preventing back-powering or signal contention-critical for modular backplane and field-replaceable unit designs.

Can TC74LCX244FTELM drive standard TTL loads?

Yes, TC74LCX244FTELM can directly drive standard TTL loads: its ±24 mA output drive capability at VCC = 3.0 V exceeds the ±0.4 mA/±16 mA requirements of TTL inputs, and its VOH ≥ VCC − 0.2 V and VOL ≤ 0.55 V meet TTL logic threshold compatibility across the full operating temperature range.

Is TC74LCX244FTELM RoHS compliant?

Yes, TC74LCX244FTELM is RoHS compliant per Toshiba's official product documentation and environmental declarations. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is marked with appropriate compliance identifiers on packaging and datasheets.

How does the dual output enable (OE1/OE2) improve system design flexibility?

The dual active-low output enables in TC74LCX244FTELM allow independent control of two 4-bit data groups-enabling segmented bus arbitration, selective peripheral isolation, and reduced contention in multi-master systems. This eliminates need for two separate 4-bit buffers and simplifies PCB routing and firmware control logic.

TC74LCX244FTELM Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

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:: 24mA, 24mA

Voltage - Supply:: 1.65V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

TC74LCX244FTELM FAQ

1.How can I place an order for TC74LCX244FTELM through Aetrix?

Please submit a Request for Quotation (RFQ) for TC74LCX244FTELM 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 TC74LCX244FTELM reliable?

The price and inventory of TC74LCX244FTELM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC74LCX244FTELM is usually 5 days.

3.What payment methods are accepted for TC74LCX244FTELM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC74LCX244FTELM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TC74LCX244FTELM?

TC74LCX244FTELM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TC74LCX244FTELM 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 TC74LCX244FTELM?

For technical support, including TC74LCX244FTELM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74LCX244FTELM requirements.

6.How does Aetrix verify that TC74LCX244FTELM is sourced from the original manufacturer or authorized distributors?

All TC74LCX244FTELM 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 TC74LCX244FTELM meets industry standards.

7.What is the process for return or replacement of TC74LCX244FTELM?

All TC74LCX244FTELM units undergo pre-shipment inspection (PSI). If there is an issue with TC74LCX244FTELM, 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 TC74LCX244FTELM part is unused and in its original packaging.

Return procedure for TC74LCX244FTELM:

1.Submit a request within 90 days.

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

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