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Home > Products > Integrated Circuits (ICs) > Logic > Latches

STMicroelectronics 74ALVCH16373TTR

Name: 74ALVCH16373TTR
Brand: STMicroelectronics
SKU: 74ALVCH16373TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ALVCH16373TTR

Manufacturer:: STMicroelectronics

Category:: Latches

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

Datasheet:: 74ALVCH16373TTR.pdf

Description:: IC TXRX 16BIT LV 3ST 48-TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:1,004

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Product details

Overview

74ALVCH16373TTR from STMicroelectronics is a 16-bit non-inverting D-type transparent latch with 3-state outputs, 3.6V-tolerant I/O, bus-hold inputs, and dual independent latch/output-enable controls (1LE/2LE, 1OE/2OE). It operates from 1.65V to 3.6V, delivers 3.6 ns max propagation delay at 3.0–3.6V, and drives ±24 mA outputs - ideal for low-voltage memory address/data bus interfacing in industrial control backplanes.

For engineers reviewing the 74ALVCH16373TTR datasheet, 74ALVCH16373TTR pinout, 74ALVCH16373TTR application, or 74ALVCH16373TTR equivalent, key selection criteria include 3.6V I/O tolerance, symmetric output drive strength across voltage rails, bus-hold functionality for floating input immunity, and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent 8-bit latch sections (1D0–1D7/1Q0–1Q7 and 2D0–2D7/2Q0–2Q7), each controlled by dedicated active-low latch enable (nLE) and active-low output enable (nOE) signals. Latching occurs on the falling edge of nLE; outputs enter high-impedance state when nOE is high.

Bus-hold circuitry actively maintains valid logic levels on undriven data inputs without external pull-ups; all I/O pins feature 3.6V tolerance regardless of VCC (1.65–3.6V), enabling mixed-voltage system interfacing. ESD protection exceeds 2 kV HBM and 200 V MM per MIL-STD-883.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	1.65 V to 3.6 V - supports single-supply operation across 1.8V, 2.5V, and 3.3V logic domains
tPD (max)	3.6 ns at VCC = 3.0–3.6V - enables >200 MHz bus timing margins in high-speed address latching
IOL / IOH (min)	±24 mA at VCC = 3.0V - drives heavy capacitive loads (e.g., 10+ CMOS inputs) without signal degradation
IOH = IOL Symmetry	Matched drive strength ensures consistent rise/fall times and reduced signal skew on bidirectional buses
Input Tolerance	3.6 V tolerant inputs/outputs - allows direct connection to 3.3V or 3.6V peripherals while powered from 1.8V
Bus-Hold Current	±75 µA at VCC = 3.0V - eliminates need for external pull resistors on unused data lines
ESD Rating	HBM > 2000 V - meets industrial handling requirements without additional board-level protection

Pinout & Package

TSSOP-48 package (4.4 mm × 12.5 mm body, 0.5 mm pitch), thermally enhanced for high-density routing and reflow compatibility.

Pin/Terminal	Circuit Role	Design Meaning
1, 24	1OE, 2OE	Active-low 3-state output enable for respective 8-bit sections - decouples latch outputs from bus during arbitration
48, 25	1LE, 2LE	Active-low latch enable - captures data on falling edge; enables transparent mode when high
2–3, 5–6, 8–9, 11–12, 37–38, 40–41, 43–44, 46–47	1Q0–1Q7, 2Q0–2Q7	Non-inverting 3-state outputs - provide bidirectional bus isolation with matched drive capability
37–47, 26–36, 48, 25, 1, 24, 4, 10, 15, 21, 28, 34, 39, 45, 7, 18, 31, 42	Data Inputs, GND, VCC	16 data inputs (1D0–1D7, 2D0–2D7), 8 GND, 4 VCC - distributed power/ground pins minimize switching noise

Key Features

Feature	Design Value
3.6V-tolerant I/O	Enables interoperability between 1.65V–3.6V logic domains without level shifters
Dual independent latch sections	Allows asynchronous capture of two 8-bit data streams (e.g., upper/lower address bytes) with separate timing control
Integrated bus-hold	Prevents floating inputs from causing metastability or excessive current draw in unconnected or tri-stated states
Symmetric output drive	Ensures equal rise/fall times and predictable timing margins under varying load conditions
Latch-up immunity >300 mA	Guarantees robust operation in noisy industrial environments with transient voltage spikes

Applications

Memory Address Latching

Industrial Backplane Interface

Use Scenario: Holding CPU address bus signals during multi-cycle memory access in programmable logic controllers.

IC Role / Device Role / Timing Role: Transparent latch capturing and holding 16-bit address lines synchronized to LE control, isolating bus during read/write cycles via OE.

Use Value: Eliminates need for external pull-ups and level translators when interfacing 3.3V CPUs with 1.8V FPGA-based peripherals.

Use Scenario: Isolating and buffering parallel control signals across modular I/O racks in factory automation systems.

IC Role / Device Role / Timing Role: Dual-section latch providing independent enable/control for analog module addressing and digital status reporting buses.

Use Value: Bus-hold prevents spurious transitions during hot-swap events; 3.6V I/O tolerance accommodates legacy 3.3V modules alongside newer 1.8V sensors.

Low-Power Data Acquisition

Test Equipment Signal Conditioning

Use Scenario: Capturing sensor data from 16-bit ADCs before serial conversion in battery-powered environmental monitors.

IC Role / Device Role / Timing Role: Latching parallel ADC output bits with minimal propagation delay and leakage (<20 µA ICC quiescent).

Use Value: 1.65V minimum VCC enables direct integration with ultra-low-power microcontrollers, reducing system BOM count.

Use Scenario: Buffering and isolating DUT interface signals in automated test fixtures with mixed-voltage instrumentation.

IC Role / Device Role / Timing Role: Providing clean, high-drive 3-state outputs to drive multiple test channel selectors while preventing back-driving.

Use Value: ±24 mA drive strength ensures reliable signal integrity across 15 cm ribbon cables; ESD rating simplifies fixture ESD design.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit transparent latch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ALVTH16373DGGR	TI part with identical pinout, same 1.65–3.6V range, but higher drive (±32 mA) and no bus-hold	Requires external pull resistors on unused inputs; better suited for high-fanout, low-noise test systems	Select when maximum output drive is critical and board space permits external biasing components
74LVC16373APAG	IDT part in TSSOP-48, 1.65–3.6V, includes bus-hold, but slower tPD = 5.2 ns (max) at 3.3V	Lower speed margin; suitable for cost-sensitive consumer-grade interfaces where <100 MHz timing suffices	Select for price-sensitive designs where 3.6 ns timing is not required and bus-hold remains essential

Compared with SN74ALVTH16373DGGR and 74LVC16373APAG, the 74ALVCH16373TTR uniquely balances 3.6 ns speed, integrated bus-hold, and 3.6V I/O tolerance in a single STMicroelectronics device - making it optimal for industrial backplanes requiring both robustness and timing precision.

Availability

74ALVCH16373TTR is available at Aetrix Electronics and suitable for industrial control backplanes, low-power data acquisition nodes, and test equipment signal conditioning requiring stable component supply and long-term lifecycle support.

Supply support for 74ALVCH16373TTR 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, designing and manufacturing silicon solutions for automotive, industrial, and power management applications.

The 74ALVCH series targets low-voltage, high-speed logic interfacing in industrial and embedded systems - emphasizing I/O tolerance, bus-hold reliability, and extended temperature operation (–55°C to +125°C).

FAQ

What is the maximum operating temperature range for the 74ALVCH16373TTR?

The 74ALVCH16373TTR is rated for operation from –55°C to +125°C, validated per JEDEC JESD78 and qualified for extended industrial environments. This range is confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the official STMicroelectronics datasheet (Rev 3, February 2003), with full DC and AC specifications guaranteed across the entire span.

Does the 74ALVCH16373TTR require external pull-up or pull-down resistors on its data inputs?

No - the device integrates active bus-hold circuitry on all data inputs (1D0–1D7, 2D0–2D7), maintaining valid logic states without external resistors. Bus-hold current is specified as ±75 µA at VCC = 3.0V, eliminating floating-input risks in unconnected or tri-stated configurations per the DC Specifications table (page 4).

Can the 74ALVCH16373TTR be used with a 1.8V supply while interfacing to a 3.3V microcontroller?

Yes - all inputs and outputs are 3.6V tolerant, allowing safe connection to 3.3V peripherals even when VCC = 1.8V. The device meets VIH/VIL thresholds at 1.8V (VIH = 0.65×VCC = 1.17V min; VIL = 0.35×VCC = 0.63V max), and VOH/VOL remain compatible per DC specs (page 4), enabling direct interoperation without level-shifting circuitry.

How does the dual latch-enable architecture improve system timing flexibility?

The independent 1LE and 2LE inputs allow asynchronous latching of two 8-bit data groups - for example, capturing upper and lower address bytes at different clock phases. This avoids pipeline stalls in multi-cycle memory accesses and reduces timing constraints on shared control signals, as verified in the Truth Table and Logic Diagram (pages 2–3) where LE transitions directly govern Q-state updates without clock dependency.

74ALVCH16373TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74ALVCH

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: D-Type Transparent Latch

Circuit:: 8:8

Output Type:: Tri-State

Voltage - Supply:: 1.65V ~ 3.6V

Independent Circuits:: 2

Delay Time - Propagation:: 1ns

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

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

74ALVCH16373TTR FAQ

1.How can I place an order for 74ALVCH16373TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ALVCH16373TTR 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 74ALVCH16373TTR reliable?

The price and inventory of 74ALVCH16373TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVCH16373TTR is usually 5 days.

3.What payment methods are accepted for 74ALVCH16373TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVCH16373TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ALVCH16373TTR?

74ALVCH16373TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ALVCH16373TTR 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 74ALVCH16373TTR?

For technical support, including 74ALVCH16373TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVCH16373TTR requirements.

6.How does Aetrix verify that 74ALVCH16373TTR is sourced from the original manufacturer or authorized distributors?

All 74ALVCH16373TTR 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 74ALVCH16373TTR meets industry standards.

7.What is the process for return or replacement of 74ALVCH16373TTR?

All 74ALVCH16373TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVCH16373TTR, 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 74ALVCH16373TTR part is unused and in its original packaging.

Return procedure for 74ALVCH16373TTR:

1.Submit a request within 90 days.

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

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