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

STMicroelectronics 74VHCT244ATTR

Name: 74VHCT244ATTR
Brand: STMicroelectronics
SKU: 74VHCT244ATTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHCT244ATTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 74VHCT244ATTR.pdf

Description:: IC BUFFER NON-INVERT 5.5V 20SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74VHCT244ATTR from STMicroelectronics is an octal non-inverting 3-state bus buffer IC designed for bidirectional data routing in 5V TTL-compatible digital systems. It features 8-channel symmetric drive (±8 mA), 5.4 ns typical propagation delay at 5V, and operates across 4.5–5.5 V with input tolerance up to 7V-enabling safe 5V-to-3V interface applications in memory address drivers and bus isolation circuits.

For engineers reviewing the 74VHCT244ATTR datasheet, 74VHCT244ATTR pinout, 74VHCT244ATTR application, or 74VHCT244ATTR equivalent, key selection criteria include 3-state output timing (tPLZ/tPZL ≤ 13.0 ns), TTL-level input compatibility (VIH ≥ 2V, VIL ≤ 0.8V), power-down protection on all I/Os, and ±2 kV ESD immunity per IEC 61000-4-2.

Technical Context

This device implements two independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output enable (1G, 2G). All inputs accept 0–7 V regardless of VCC, enabling hot-swap and mixed-voltage operation without external level shifters.

Its C2MOS fabrication delivers low static current (ICC ≤ 4 µA at 25°C) and balanced tPLH/tPHL propagation delays. Output disable/enable transitions are characterized under 15 pF and 50 pF loads with RL = 1 kΩ, supporting reliable timing in high-speed bus arbitration and memory read/write cycles.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5V supply tolerances.
tPD (Typ.)	5.4 ns at VCC = 5V, CL = 15 pF - Enables sub-10 ns bus cycle timing in high-speed control logic.
IOL / IOH	±8 mA minimum - Drives standard TTL loads and multiple CMOS inputs without buffering.
VIH / VIL	2.0 V min / 0.8 V max - Guarantees interoperability with legacy 5V TTL outputs.
ESD Immunity	±2 kV HBM - Protects against handling-induced discharge during PCB assembly and field service.
Input Voltage Range	−0.5 V to +7.0 V - Allows safe operation during power sequencing and voltage rail mismatch.
ICC (Max)	4 µA at TA = 25°C - Minimizes quiescent power in always-on system management functions.

Pinout & Package

TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, thin shrink small outline profile with exposed pad not present. Lead finish: matte tin.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1G, 2G - Active-Low Output Enable	Controls group A (pins 2,4,6,8 → 9,7,5,3) and group B (pins 11,13,15,17 → 18,16,14,12) independently; enables 3-state output when low.
2,4,6,8,11,13,15,17	A1–A4, B1–B4 - Data Inputs	Non-inverting inputs accepting TTL thresholds; tolerate 0–7 V regardless of VCC for mixed-rail interfacing.
3,5,7,9,12,14,16,18	Y1–Y4, Y1–Y4 - 3-State Outputs	Drive bus lines with ±8 mA capability; enter high-impedance state when respective G is high.
10	GND	Reference ground for all I/O and internal logic; decoupling capacitor required adjacent to pin.
20	VCC	Primary 4.5–5.5 V supply; requires local 100 nF ceramic bypass capacitor.

Key Features

Feature	Design Value
Power-down protection	All inputs and outputs remain functional and non-damaging when VCC = 0 V - supports hot-plug and partial-power-down modes.
Input overvoltage tolerance	Accepts −0.5 V to +7.0 V on any input pin - eliminates need for external clamping diodes in 5V↔3V translation.
Low-noise switching	VOLP ≤ 0.9 V (CL = 50 pF) - reduces simultaneous switching noise in dense bus layouts.
Latch-up immunity	Improved vs. standard VHCT - withstands transient currents per JEDEC JESD78 Class II without destructive latch-up.

Applications

Memory Address Buffering

Bus Isolation in Industrial PLCs

Use Scenario: Driving 20-bit address bus from microcontroller to SRAM/Flash with load sharing across multiple devices.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing fan-out gain and bus contention prevention during DMA cycles.

Use Value: 5.4 ns tPD ensures setup/hold margin for 100 MHz address strobes; ±8 mA drive sustains signal integrity across 15 cm PCB traces.

Use Scenario: Isolating CPU data bus from field I/O modules subject to EMI and voltage transients.

IC Role / Device Role / Timing Role: Bidirectional bus gate with independent enable controls for read/write direction management.

Use Value: 7V input tolerance prevents false triggering during 24V field-side surges; ±2 kV ESD rating meets IEC 61000-4-2 Level 3.

5V-to-3V Logic Interface

Test Equipment Signal Conditioning

Use Scenario: Interfacing 5V FPGA I/O banks to 3.3V ADC/DAC peripherals without level translators.

IC Role / Device Role / Timing Role: Voltage-tolerant input buffer translating TTL logic levels while maintaining 3-state control.

Use Value: VIH/VIL specs match both 5V TTL and 3.3V LVTTL thresholds; no external biasing or resistors required.

Use Scenario: Routing and gating digital stimulus signals in automated test equipment with programmable path selection.

IC Role / Device Role / Timing Role: Low-skew, low-capacitance signal switch enabling precise timing control of test vectors.

Use Value: CIN = 6 pF and balanced tPLH/tPHL minimize jitter accumulation across 8 parallel paths.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC244APWR	3.3V-only supply (1.65–3.6V); lower drive (±24 mA); higher speed (tPD = 3.5 ns typ.)	Requires level-shifting for 5V systems; optimized for low-voltage portable designs.	Select when operating exclusively at 3.3V and needing faster edge rates.
74ACT244SCX	5V supply only (4.5–5.5V); higher ICC (40 mA max); stronger drive (±24 mA); no 7V input tolerance	Lacks mixed-voltage safety; better for high-current bus loading but less robust in noisy environments.	Select when maximum drive strength is critical and input overvoltage risk is absent.

Compared with SN74LVC244APWR and 74ACT244SCX, the 74VHCT244ATTR uniquely combines 5V TTL compatibility, 7V input tolerance, and ultra-low ICC - making it optimal for legacy-system upgrades and mixed-rail industrial interfaces where reliability trumps raw speed.

Availability

74VHCT244ATTR is available at Aetrix Electronics and suitable for memory address buffering, industrial bus isolation, 5V-to-3V logic interface, and test equipment signal conditioning requiring stable component supply across extended temperature ranges (−55°C to +125°C).

Supply support for 74VHCT244ATTR 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, delivering automotive, industrial, and power management solutions with emphasis on reliability and long-term product availability.

The VHCT logic family targets TTL-compatible 5V systems requiring low power, high noise immunity, and robust mixed-voltage operation - specifically engineered for industrial control, instrumentation, and legacy system modernization.

FAQ

Can 74VHCT244ATTR operate with VCC = 0 V while inputs remain active?

Yes. Its power-down protection allows all inputs and outputs to tolerate −0.5 V to +7.0 V regardless of VCC state. When VCC = 0 V, pins remain high-impedance and non-damaging, enabling hot-swap and partial-power-down configurations without external circuitry.

What is the maximum capacitive load this device can drive reliably?

The 74VHCT244ATTR is characterized up to 50 pF load capacitance with guaranteed timing (tPLH/tPHL ≤ 9.5 ns). For loads exceeding 50 pF, propagation delay increases linearly; design margin requires derating based on measured board trace + stub capacitance, typically limiting practical use to ≤ 75 pF with added series termination.

Does this part support live insertion into a powered backplane?

Yes. With 7V input tolerance, ±2 kV HBM ESD rating, and power-down protection, the 74VHCT244ATTR meets requirements for live insertion in industrial backplanes. However, mechanical sequencing (ground-first, power-last) and current-limiting series resistors on data lines are still recommended per IEC 61000-4-5 guidelines.

How does its 3-state enable timing compare to standard 74LS244?

The 74VHCT244ATTR offers significantly faster enable/disable times: tPZL/tPLZ ≤ 13.0 ns (vs. ~35 ns for 74LS244) at 5V. This reduces bus turnaround latency in bidirectional protocols like IEEE-488 or custom memory-mapped I/O, improving overall system throughput in real-time control loops.

74VHCT244ATTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VHCT

Package/Case:: 20-SOIC (0.295", 7.50mm 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:: 8mA, 8mA

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

74VHCT244ATTR FAQ

1.How can I place an order for 74VHCT244ATTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHCT244ATTR 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 74VHCT244ATTR reliable?

The price and inventory of 74VHCT244ATTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT244ATTR is usually 5 days.

3.What payment methods are accepted for 74VHCT244ATTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT244ATTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHCT244ATTR?

74VHCT244ATTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHCT244ATTR 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 74VHCT244ATTR?

For technical support, including 74VHCT244ATTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT244ATTR requirements.

6.How does Aetrix verify that 74VHCT244ATTR is sourced from the original manufacturer or authorized distributors?

All 74VHCT244ATTR 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 74VHCT244ATTR meets industry standards.

7.What is the process for return or replacement of 74VHCT244ATTR?

All 74VHCT244ATTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT244ATTR, 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 74VHCT244ATTR part is unused and in its original packaging.

Return procedure for 74VHCT244ATTR:

1.Submit a request within 90 days.

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

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