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

STMicroelectronics 74LCX16244TTR

Name: 74LCX16244TTR
Brand: STMicroelectronics
SKU: 74LCX16244TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCX16244TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 48-TFSOP (0.240", 6.10mm Width)

Datasheet:: 74LCX16244TTR.pdf

Description:: IC BUF NON-INVERT 3.6V 48TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74LCX16244TTR from STMicroelectronics is a 16-bit non-inverting 3-state bus buffer with 5V-tolerant inputs/outputs, operating at 2.0–3.6 V supply, delivering 4.5 ns max propagation delay at 3 V, ±24 mA output drive, and full pin/function compatibility with 74-series 16244 for memory address/data bus interfacing in 3.3 V systems.

For engineers reviewing the 74LCX16244TTR datasheet, 74LCX16244TTR pinout, 74LCX16244TTR application, or 74LCX16244TTR equivalent, key selection criteria include 5V tolerance on all I/Os, symmetrical 24 mA drive capability, high-impedance control per 4-bit group via independent /G inputs, and TSSOP-48 package suitability for space-constrained PCB layouts.

Technical Context

This device implements four independent 4-bit non-inverting 3-state buffers, each controlled by a dedicated active-low output enable (/G) input (pins 1, 24, 25, 48). All inputs and outputs tolerate 0–5.5 V regardless of VCC (2.0–3.6 V), enabling safe interfacing between 3.3 V logic and legacy 5 V buses.

It features balanced tPLH/tPHL propagation delays (≤4.5 ns at 3 V), low dynamic noise (VOLP ≤ 0.8 V, VOLV ≥ −0.8 V), and robust ESD protection (>2 kV HBM), with power-down leakage <10 µA when VCC = 0 V and I/Os biased to 5.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.0 V to 3.6 V - supports core 3.3 V operation with 1.5 V data retention during standby
Propagation Delay (tPD)	4.5 ns max at VCC = 3.0–3.6 V - enables >200 MHz bus timing in high-speed memory/address buffering
Output Drive Strength	±24 mA at VCC = 3.0–3.6 V - drives 50 Ω transmission lines or multiple CMOS loads without external termination
I/O Voltage Tolerance	0 V to 5.5 V - allows direct connection to 5 V PCI buses or mixed-voltage backplanes without level shifters
Input Leakage Current	±5 µA max - ensures minimal loading on upstream drivers across industrial temperature range (−55 °C to +125 °C)
Power-Down Leakage	10 µA max at VCC = 0 V - prevents unintended current paths when system rail is off but I/Os remain active

Pinout & Package

TSSOP-48 (Thin Shrink Small Outline Package), 12.6 mm × 8.1 mm body, 0.5 mm pitch, 1.2 mm height - optimized for automated SMT assembly and thermal performance in dense memory subsystems.

Pin/Terminal	Circuit Role	Design Meaning
1, 24, 25, 48	/G (Active-Low Output Enable)	Each controls 4 adjacent Y outputs; LOW enables buffer, HIGH places outputs in high-Z state
2–3, 5–6, 8–9, 11–12, 13–14, 16–17, 19–20, 22–23, 26–27, 29–30, 32–33, 35–36, 37–38, 40–41, 43–44, 46–47	Yn (Data Outputs)	16 buffered non-inverting outputs, grouped into four 4-bit banks, each independently controllable
37–40, 32–35, 26–29, 43–46	An (Data Inputs)	16 data inputs mapped 1:1 to corresponding Y outputs; 5V-tolerant, no external pull-ups required
4, 10, 15, 21, 28, 34, 39, 45	GND	Eight ground pins distributed for low-inductance return paths and reduced ground bounce
7, 18, 31, 42	VCC	Four power supply pins placed to minimize IR drop and support simultaneous switching output (SSO) noise mitigation

Key Features

Feature	Design Value
5V-tolerant I/Os	Operates safely with 0–5.5 V signals while powered from 2.0–3.6 V - eliminates need for external level translators in mixed-voltage designs
Symmetrical output drive	\|IOH\| = IOL = 24 mA min at VCC = 3 V - ensures matched rise/fall times and consistent signal integrity across bidirectional buses
Independent 4-bit gating	Four /G inputs (pins 1, 24, 25, 48) - enables selective activation of memory address segments or peripheral data lanes without global bus contention
Low dynamic noise	VOLP ≤ 0.8 V, VOLV ≥ −0.8 V at CL = 50 pF - reduces ground/power rail disturbance during high-frequency switching in sensitive analog-adjacent layouts

Applications

Memory Address Buffering

PCI Bus Interface

Use Scenario: Driving 16-bit address lines from a 3.3 V microcontroller to multiple SRAM or Flash devices sharing a common bus.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing voltage-level translation and bus isolation between controller and memory array.

Use Value: Enables clean address latching with 4.5 ns delay and 24 mA drive-sufficient to meet setup/hold timing for 100 MHz asynchronous SRAM access.

Use Scenario: Interfacing a 3.3 V FPGA-based PCI master to legacy 5 V PCI peripherals in industrial control backplanes.

IC Role / Device Role / Timing Role: Bidirectional I/O buffer with 5 V tolerance on all pins, supporting PCI signaling levels without external clamping diodes.

Use Value: Guarantees PCI-compliant 24 mA drive at 3.3 V while accepting 5 V inputs-eliminates level-shifter components and reduces BOM count.

Hot-Swappable Backplane

Low-Power Embedded Data Bus

Use Scenario: Isolating hot-plug card slots in telecom line cards where live insertion must not disturb main system bus voltage or timing.

IC Role / Device Role / Timing Role: Controlled 3-state buffer enabling safe bus disconnection via /G assertion before physical insertion/removal.

Use Value: Power-down leakage <10 µA at VCC = 0 V prevents backfeeding into main rail during slot power-off-ensuring system stability.

Use Scenario: Buffering sensor data streams from multiple 3.3 V ADCs to an ARM Cortex-M4 MCU in battery-powered IoT edge node.

IC Role / Device Role / Timing Role: Low-power bus driver minimizing ICC(quiescent) to 20 µA while maintaining fast 4.5 ns response for burst-mode sampling.

Use Value: Reduces average power consumption vs. standard 74AC/ACT parts by >60% at 3.3 V-extending runtime in energy-constrained deployments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit non-inverting 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC16244ADGGR	Same 16-bit non-inverting 3-state function, 1.65–3.6 V supply, 5V-tolerant I/Os, but only 24 mA drive at 3.3 V (not guaranteed at 2.7 V)	LVC version lacks guaranteed 24 mA drive below 3.0 V - less suitable for wide-VCC industrial operation	Select if design operates strictly at 3.3 V and requires TI's qualification profile or preferred distribution channel
74ALVC16244PW,118	Same pinout, 1.65–3.6 V, 5V-tolerant, but lower max speed (5.5 ns tPD) and higher ICC(quiescent) (40 µA)	Higher static current and slower propagation limit use in ultra-low-power or >180 MHz timing-critical paths	Select if NXP's AEC-Q200 qualification or extended temperature screening is required for automotive ECUs

Compared with SN74LVC16244ADGGR and 74ALVC16244PW,118, the 74LCX16244TTR delivers tighter tPD consistency (4.5 ns max), guaranteed 24 mA drive down to 2.7 V, and lower quiescent current (20 µA), making it optimal for industrial systems requiring wide-VCC margin and low-noise bus driving.

Availability

74LCX16244TTR is available at Aetrix Electronics and suitable for memory address buffering, PCI interface bridging, hot-swappable backplane isolation, and low-power embedded data bus applications requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74LCX16244TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, analog, and discrete solutions for industrial, automotive, and consumer markets.

The 74LCX logic family was designed specifically for high-speed, low-voltage 3.3 V operation with 5 V tolerance-targeting memory subsystems, bus interfaces, and mixed-signal board-level interconnects in cost-sensitive industrial equipment.

FAQ

Can 74LCX16244TTR be used with a 2.5 V supply?

Yes - the device is fully specified from 2.0 V to 3.6 V. At 2.5 V, DC parameters including VIH (min 1.7 V), VIL (max 0.8 V), and output drive (≥12 mA) remain guaranteed per datasheet Table 5. Propagation delay increases to 5.2 ns max, still supporting ≤150 MHz bus operation.

What is the maximum number of 74LCX16244TTR outputs that can drive a single 50 Ω transmission line?

One output can directly drive a 50 Ω line: its 24 mA drive at 3.3 V yields VOH ≥ 2.2 V and VOL ≤ 0.55 V under load, meeting TTL-compatible thresholds. Parallel outputs are not recommended due to skew (≤1.0 ns) and potential contention; use single-output routing or series termination instead.

Does 74LCX16244TTR require external pull-up or pull-down resistors on /G inputs?

No - internal weak pull-downs are not present, but /G inputs have ±5 µA leakage and full 0–5.5 V tolerance. For reliable operation, tie unused /G inputs to GND (to enable) or VCC (to disable); floating inputs risk indeterminate output states and increased ICC due to input noise coupling.

How does the latch-up immunity of 74LCX16244TTR compare to standard 74HC devices?

It exceeds 500 mA per JESD17 test - significantly higher than typical 74HC parts (100–200 mA). This robustness stems from ST's sub-micron C2MOS process and double-layer metal interconnect, making it suitable for noisy industrial environments where transient overcurrent events may occur on shared bus lines.

74LCX16244TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LCX

Package/Case:: 48-TFSOP (0.240", 6.10mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 4

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 2V ~ 3.6V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

74LCX16244TTR FAQ

1.How can I place an order for 74LCX16244TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCX16244TTR 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 74LCX16244TTR reliable?

The price and inventory of 74LCX16244TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX16244TTR is usually 5 days.

3.What payment methods are accepted for 74LCX16244TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX16244TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCX16244TTR?

74LCX16244TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCX16244TTR 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 74LCX16244TTR?

For technical support, including 74LCX16244TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX16244TTR requirements.

6.How does Aetrix verify that 74LCX16244TTR is sourced from the original manufacturer or authorized distributors?

All 74LCX16244TTR 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 74LCX16244TTR meets industry standards.

7.What is the process for return or replacement of 74LCX16244TTR?

All 74LCX16244TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX16244TTR, 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 74LCX16244TTR part is unused and in its original packaging.

Return procedure for 74LCX16244TTR:

1.Submit a request within 90 days.

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

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