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

STMicroelectronics 74AC16244TTR

Name: 74AC16244TTR
Brand: STMicroelectronics
SKU: 74AC16244TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74AC16244TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74AC16244TTR.pdf

Description:: IC BUFF NON-INVERT 6V 48TSSOP

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Product details

Overview

74AC16244TTR from STMicroelectronics is a 16-bit non-inverting bus buffer with 3-state outputs, designed for high-speed address/data bus driving in memory and peripheral interfaces. It delivers 4.5 ns typical propagation delay at 5 V, ±24 mA symmetrical output drive, and operates across 2 V to 6 V supply range with latch-up immunity and power-down input protection.

For engineers reviewing the 74AC16244TTR datasheet, 74AC16244TTR pinout, 74AC16244TTR application, or 74AC16244TTR equivalent, key selection criteria include 3-state enable timing (tPZL/tPLZ ≤ 14 ns), input noise immunity (VNIH/VNIL ≥ 28% VCC), rail-to-rail voltage operation, and TSSOP-48 package compatibility with legacy 74-series footprint layouts.

Technical Context

This device implements four independent 4-bit buffer groups, each controlled by a dedicated active-low output enable (nG) input-pins 1, 24, 25, and 48-enabling selective 4-bit or full 16-bit bus control. All buffers are non-inverting and share common VCC (pins 7, 18, 31, 42) and GND (pins 4, 10, 15, 21, 28, 34, 39, 45) rails.

It uses sub-micron C2MOS technology to achieve balanced tPLH ≈ tPHL propagation delays, low ICC (≤ 8 µA max at 25°C), and robust DC specs: VIH ≥ 2.1 V (at VCC = 3.0 V), VOL ≤ 0.44 V (IO = 12 mA), and high-impedance leakage ≤ ±5 µA-critical for hot-swap and bus-sharing applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay (tPD)	4.5 ns typical at VCC = 5 V - enables ≤ 222 MHz bus toggle rate in point-to-point configurations
Output Drive Strength	±24 mA min - supports driving 50 Ω transmission lines or multiple TTL loads without external buffering
Supply Voltage Range	2 V to 6 V - interoperable with 3.3 V and 5 V logic domains, including mixed-voltage backplanes
Input Noise Immunity	VNIH/VNIL ≥ 28% VCC min - rejects >1.4 V noise on 5 V buses, improving signal integrity in noisy industrial environments
Quiescent Current	8 µA max at TA = 25°C - reduces standby power in battery-backed or always-on control modules
3-State Enable/Disable Time	tPZL/tPLZ ≤ 14 ns (VCC = 5 V) - ensures clean bus arbitration during dynamic enable sequencing
Operating Temperature	–55°C to +125°C - qualified for under-hood automotive and industrial motor-control applications

Pinout & Package

TSSOP-48 (Thin Shrink Small Outline Package), 12.6 mm × 8.1 mm body, 0.5 mm pitch, 1.2 mm max height. Pin 1 marked via corner chamfer; thermal pad not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
1, 24, 25, 48	nG (Active-Low Output Enable)	Four independent group enables - tying all together yields full 16-bit control; asserted LOW enables outputs
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 - each pair corresponds to one A-input within its 4-bit group
43–46, 37–40, 29–32, 26–29, 22–23, 19–20, 16–17, 13–14, 11–12, 8–9, 5–6, 2–3, 47–46, 44–43, 41–40, 38–37	An (Data Inputs)	16 inputs mapped 1:1 to Yn outputs - grouped as 1A1–1A4 → 1Y1–1Y4, etc., per enable control
4, 10, 15, 21, 28, 34, 39, 45	GND	Eight ground terminals - reduce ground bounce and improve noise rejection in high-speed switching
7, 18, 31, 42	VCC	Four power supply pins - distributed for low-impedance VCC routing and reduced simultaneous switching noise

Key Features

Feature	Design Value
Symmetrical Output Impedance	\|IOH\| = \|IOL\| ≥ 24 mA - eliminates duty-cycle distortion when driving asymmetrical loads like unterminated traces
Power-Down Input Protection	Inputs remain high-impedance and non-latching when VCC = 0 V - prevents back-driving and current injection during power sequencing
Balanced Propagation Delays	tPLH ≈ tPHL - maintains signal edge alignment across all 16 bits, critical for setup/hold timing in synchronous buses
PIN-Compatible with 74 Series	Direct drop-in replacement for 74F/74LS16244 - preserves PCB layout while upgrading speed and drive capability
Improved Latch-Up Immunity	Qualified per JEDEC JESD78 - withstands >200 mA transient current without destructive latch-up in harsh ESD or surge events

Applications

Memory Address Buffering

Peripheral Bus Isolation

Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or Flash memory in embedded systems.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing level translation and fanout expansion between controller and memory.

Use Value: 4.5 ns tPD and ±24 mA drive ensure reliable address setup before memory access cycles, even at 50 MHz bus clocks.

Use Scenario: Isolating ISA or LPC bus segments between host processor and legacy I/O peripherals.

IC Role / Device Role / Timing Role: Bidirectional bus buffer enabling controlled data flow with precise enable/disable timing.

Use Value: tPZL/tPLZ ≤ 14 ns guarantees glitch-free bus handoff during peripheral enumeration and configuration writes.

Industrial PLC Backplane Interface

Automotive Body Control Module

Use Scenario: Interfacing modular I/O cards to a central PLC CPU over a ruggedized parallel backplane.

IC Role / Device Role / Timing Role: High-noise-immunity buffer protecting address/data integrity in electrically noisy factory environments.

Use Value: 28% VCC noise margin and –55°C to +125°C rating maintain reliable operation near motors, solenoids, and VFDs.

Use Scenario: Managing shared diagnostic and sensor data lines between MCU and CAN/LIN transceivers in BCMs.

IC Role / Device Role / Timing Role: Low-quiescent-current 3-state buffer enabling selective sensor multiplexing without loading inactive lines.

Use Value: 8 µA ICC max extends battery life in sleep mode; 2 V–6 V operation supports wide-range vehicle battery voltage swings.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AC16244DGGR	Same AC specs, identical pinout, TI-manufactured TSSOP-48 variant	No functional difference; validated for same memory/address buffering use cases	Select if dual-sourcing or TI-aligned BOM required
74LVC16244APAG	Lower VCC range (1.65–3.6 V), 24 mA drive, but only rated to +85°C	Not suitable for extended temperature or 5 V systems; optimized for 3.3 V portable designs	Choose only for cost-sensitive 3.3 V-only applications with ambient < 85°C

Compared with SN74AC16244DGGR, the 74AC16244TTR offers identical performance and footprint but differs in manufacturer qualification and traceability; versus 74LVC16244APAG, it provides wider voltage and temperature coverage at the cost of higher static power in 3.3 V operation.

Availability

74AC16244TTR is available at Aetrix Electronics and suitable for memory address buffering, industrial PLC backplane interfaces, and automotive body control modules requiring stable component supply across extended temperature ranges and mixed-voltage designs.

Supply support for 74AC16244TTR 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 automotive, industrial, and power management ICs with strong analog and mixed-signal design heritage.

The 74AC logic family targets high-speed, low-power digital interfacing in mission-critical industrial and automotive systems where reliability, latch-up immunity, and wide operating margins are essential.

FAQ

Is 74AC16244TTR pin-compatible with older 74LS16244 devices?

Yes - it uses identical TSSOP-48 pinout and function mapping, including 1G–4G enable inputs and grouped A/Y signals. No PCB redesign is needed; however, verify VCC decoupling and termination due to faster edge rates and lower output impedance.

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

Per AC characterization, it is specified up to 50 pF (CL = 50 pF, RL = 500 Ω). With 24 mA drive and 4.5 ns tPD, it can reliably drive ≤ 2–3 standard CMOS inputs or ≤ 15 cm of 50 Ω microstrip trace without signal integrity degradation.

Does 74AC16244TTR support hot insertion or live bus swapping?

Yes - its power-down input protection prevents back-current flow when VCC = 0 V, and high-impedance leakage is limited to ±5 µA. This allows safe insertion into powered-backplane systems, provided enable signals are held inactive until power stabilizes.

Can all four nG inputs be tied together for unified 16-bit control?

Yes - connecting pins 1, 24, 25, and 48 to a single enable signal is explicitly supported in the datasheet and enables full 16-bit operation. Ensure the driving source can sink/source sufficient current for all four inputs' combined input capacitance (≤ 40 pF total).

74AC16244TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74AC

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 ~ 6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

74AC16244TTR FAQ

1.How can I place an order for 74AC16244TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74AC16244TTR 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 74AC16244TTR reliable?

The price and inventory of 74AC16244TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC16244TTR is usually 5 days.

3.What payment methods are accepted for 74AC16244TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC16244TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74AC16244TTR?

74AC16244TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74AC16244TTR 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 74AC16244TTR?

For technical support, including 74AC16244TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC16244TTR requirements.

6.How does Aetrix verify that 74AC16244TTR is sourced from the original manufacturer or authorized distributors?

All 74AC16244TTR 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 74AC16244TTR meets industry standards.

7.What is the process for return or replacement of 74AC16244TTR?

All 74AC16244TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC16244TTR, 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 74AC16244TTR part is unused and in its original packaging.

Return procedure for 74AC16244TTR:

1.Submit a request within 90 days.

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

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