STMicroelectronics 74LVQ573TTR

Overview

74LVQ573TTR from STMicroelectronics is a low-voltage CMOS octal D-type transparent latch with non-inverting 3-state outputs, operating from 2.0 V to 3.6 V. It features 5.8 ns typical propagation delay at 3.3 V, ±12 mA symmetrical output drive, and 75 Ω transmission line driving capability-ideal for 3.3 V bus interface and data latching in industrial control backplanes.

For engineers reviewing the 74LVQ573TTR datasheet, 74LVQ573TTR pinout, 74LVQ573TTR application, or 74LVQ573TTR equivalent, key selection criteria include latch enable timing (1.5 ns min LE pulse width), output disable/enable times (7.4–7.5 ns typ), high-impedance leakage (<5 µA), ESD immunity (2 kV), and PCI-bus-level drive (24 mA guaranteed).

Technical Context

The device implements a dual-control transparent latch architecture: data passes from D0–D7 to Q0–Q7 when LE is HIGH; outputs freeze on the falling edge of LE. Output state is further gated by active-low OE, enabling high-impedance tri-state operation for shared bus arbitration.

Designed using sub-micron C2MOS technology, it delivers balanced tPLH/tPHL propagation delays, low dynamic noise (VOLP = 0.5 V typ), and symmetrical |IOH| = |IOL| = 12 mA (min) at 3.0 V-ensuring clean signal integrity on matched-impedance PCB traces.

Key Specifications

Pinout & Package

TSSOP-20 package (6.5 mm × 4.4 mm, 0.65 mm pitch) with input pins (D0–D7, LE, OE) on left side and output pins (Q0–Q7) on right side-optimized for orthogonal PCB routing and reduced trace coupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transparent latch applications.

Compared with SN74LVTH573PW and 74LVC573AT20, the 74LVQ573TTR uniquely balances 75 Ω transmission line drive, 2 kV ESD, and 1.2 V data retention-making it optimal for ruggedized 3.3 V industrial interfaces where reliability and mixed-voltage operation are critical.

Availability

74LVQ573TTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, PCI bus latching, and test equipment digital pattern generation requiring stable component supply across extended temperature and long product lifecycles.

Supply support for 74LVQ573TTR 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 solutions with vertical manufacturing and broad IP portfolio.

The 74LVQ series targets low-voltage, low-noise 3.3 V logic interface applications-designed specifically for industrial control, telecom infrastructure, and automotive electronics where ESD robustness, timing precision, and extended temperature operation are mandatory.

FAQ

What is the minimum LE pulse width required for reliable latching?

The 74LVQ573TTR requires a minimum LE HIGH pulse width of 1.5 ns at VCC = 3.3 V (typical) and 4.0 ns across full temperature range (−55°C to +125°C). This ensures setup/hold timing margins are met for D-input sampling on the LE falling edge, even under worst-case process and voltage conditions.

Can the 74LVQ573TTR drive a 50 Ω transmission line?

No-the device is specified for 75 Ω transmission line driving capability per datasheet Table 1. Driving 50 Ω loads may exceed IOL/IOH limits (12 mA min), causing excessive VOL/V OH shift and timing degradation. For 50 Ω systems, use a dedicated line driver or add series termination.

Is the 74LVQ573TTR compatible with 5 V TTL logic inputs?

Yes-its VIH threshold is 2.0 V min over full VCC range, and inputs tolerate up to VCC + 0.5 V. When interfaced with 5 V TTL outputs, a series resistor (≥1 kΩ) is recommended to limit IIK current and prevent overstress, as absolute max VI is VCC + 0.5 V.

Does the 74LVQ573TTR support hot insertion in live backplanes?

It provides 2 kV HBM ESD protection and improved latch-up immunity, but lacks explicit hot-swap circuitry (e.g., power sequencing, slew-rate control). For live insertion, external protection (current-limiting resistors, TVS diodes) and controlled ramp-up of VCC/GND are required per IEC 61000-4-2 Level 3.