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

Diodes Incorporated PI74LPT573AS

Name: PI74LPT573AS
Brand: Diodes Incorporated
SKU: PI74LPT573AS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI74LPT573AS

Manufacturer:: Diodes Incorporated

Category:: Latches

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

Datasheet:: PI74LPT573AS.pdf

Description:: IC D-TYPE TRANSP SGL 8:8 20SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PI74LPT573AS from Pericom Semiconductor is an 8-bit transparent latch with 3-state outputs, designed for bus-oriented data latching in mixed-voltage systems. It supports dual-supply operation (2.7V–3.6V V_CC), accepts 3.3V or 5.0V inputs, drives 3.3V buses or interfaces to 5V buses, and delivers ±24 mA output drive. Used in address/data bus isolation and level translation between 3.3V controllers and legacy 5V peripherals.

For engineers reviewing the PI74LPT573AS datasheet, PI74LPT573AS pinout, PI74LPT573AS application, or PI74LPT573AS equivalent, key selection criteria include 3-state enable timing (t_PZH/t_PHZ ≤ 9.5/6.5 ns), input hysteresis (150 mV), industrial temperature range (–40°C to +85°C), and 5V-tolerant I/O capability in a 20-pin SOIC package.

Technical Context

The PI74LPT573AS implements a synchronous transparent latch architecture where data passes through when Latch Enable (LE) is HIGH and is captured on the falling edge of LE. Its 3-state outputs are controlled independently by an active-low Output Enable (OE), enabling bidirectional bus sharing without contention.

Designed in 0.6 µm CMOS, it features TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_VIH ≥ 2.0 V for I/O pins), clamp diodes (V_IK = –0.7 V), and low ground bounce-critical for noise-sensitive digital backplanes and high-speed control buses.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - ensures stable operation across 3.3V nominal supply with ±10% tolerance
Input Voltage Tolerance	–0.5 V to +7.0 V - enables direct interfacing with 5V logic without external level shifters
Output Drive	±24 mA - sufficient to drive 50 Ω transmission lines or multiple LS-TTL loads
t_PLH/t_PHL (Dx→Ox)	1.5 ns / 8.0 ns - supports >100 MHz bus toggle rates in typical load conditions
t_PZH/t_PHZ (OE→Ox)	1.5 ns / 6.5 ns - allows fast bus turnaround for time-critical arbitration protocols
Operating Temperature	–40°C to +85°C - qualified for industrial-grade embedded control and communications equipment
Input Hysteresis	150 mV - suppresses noise-induced glitches on noisy PCB traces or long cables

Pinout & Package

PI74LPT573AS is housed in a 20-pin 300-mil wide plastic SOIC (Small Outline Integrated Circuit) package, pin-compatible with industry-standard 74-series latches and suitable for wave-solder and reflow assembly.

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Power Supply	3.3V core supply rail; must be decoupled locally to suppress switching noise
GND	Ground Reference	Common return path for all I/O and internal logic; requires low-impedance PCB plane
D0–D7	Data Inputs	Asynchronous data inputs tolerant to 5V; hysteresis improves noise immunity
O0–O7	3-State Outputs	Bus-capable outputs with ±24 mA drive; enter high-Z when OE = HIGH
LE	Latch Enable	Active-HIGH control: transparent when HIGH, latches data on falling edge
OE	Output Enable	Active-LOW control: disables outputs (high-Z) when HIGH; independent of LE state

Key Features

Feature	Design Value
5V-Tolerant I/O	Inputs accept 0–5.5 V; outputs drive 3.3V or interface safely to 5V buses without damage
Balanced Output Drive	24 mA sink and source capability ensures clean signal edges into capacitive or resistive loads
Low Ground Bounce	Optimized output stage layout minimizes simultaneous switching noise on shared GND paths
Industrial Temp Range	Validated operation from –40°C to +85°C supports deployment in uncontrolled environments
Hysteresis on All Inputs	150 mV threshold margin prevents metastability from slow-rising or noisy control signals

Applications

Microprocessor Bus Interface

Memory Address Latching

Use Scenario: Isolating 3.3V CPU address/data bus from legacy 5V peripheral subsystems.

IC Role / Device Role / Timing Role: Transparent latch synchronizing burst transfers while enabling bus sharing via 3-state control.

Use Value: Eliminates need for discrete level translators; t_PLH/t_PHL ≤ 8 ns meets 100 MHz bus timing budgets.

Use Scenario: Capturing and holding memory address lines during multiplexed DRAM access cycles.

IC Role / Device Role / Timing Role: Edge-triggered latch capturing address on LE falling edge; OE enables dynamic bus release.

Use Value: t_W(LE) = 6.0 ns minimum ensures reliable capture; ±24 mA drive sustains signal integrity over 6-inch traces.

Industrial PLC I/O Expansion

Test Equipment Signal Routing

Use Scenario: Buffering and isolating field I/O signals in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Level-translating latch providing noise-immune data staging between MCU and isolated I/O modules.

Use Value: 150 mV input hysteresis rejects EMI from motor drives; –40°C to +85°C rating matches industrial ambient.

Use Scenario: Dynamic routing of test vectors between ATE channel drivers and DUT pins.

IC Role / Device Role / Timing Role: Fast-enable 3-state latch allowing sub-10 ns bus reconfiguration during pattern sequencing.

Use Value: t_PZH/t_PHZ ≤ 9.5/6.5 ns enables precise timing control; 5V tolerance accommodates mixed-voltage DUTs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit transparent latch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC573APWR	3.3V-only I/O (no 5V tolerance); lower ICCQ (1 µA vs. 10 µA typ.)	Not suitable for direct 5V bus interfacing; requires external clamping or level shifters	Select when system uses only 3.3V peripherals and ultra-low static power is critical
74ALVC573MTCX	Higher speed (t_PD = 2.5 ns max); no hysteresis; V_CC = 1.65–3.6 V	Lacks noise immunity on long traces; not rated for 5V-tolerant operation	Prefer for high-speed, short-trace board designs where EMI is controlled and voltage domains are uniform

Compared with SN74LVC573APWR and 74ALVC573MTCX, PI74LPT573AS uniquely combines 5V-tolerant I/O, input hysteresis, and industrial temperature support-making it the only choice for robust mixed-voltage bus isolation in harsh environments.

Availability

PI74LPT573AS is available at Aetrix Electronics and suitable for microprocessor bus interface, memory address latching, and industrial PLC I/O expansion requiring stable component supply and long-term lifecycle assurance.

Supply support for PI74LPT573AS 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

Pericom Semiconductor was a fabless provider of high-performance interface, timing, and signal integrity solutions, acquired by Diodes Incorporated in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.

The PI74LPT series targets mixed-voltage digital systems requiring level translation, bus isolation, and noise-resilient data latching-designed specifically for compatibility with LCX™ and LVT™ families in backplane and control-plane applications.

FAQ

Can PI74LPT573AS operate with a 2.5V supply?

No. The device is specified for V_CC = 2.7 V to 3.6 V only. At 2.5V, VIH/VIL thresholds and output drive fall outside guaranteed limits per DC Electrical Characteristics table; functionality is not assured and may result in metastability or excessive propagation delay.

Is PI74LPT573AS pin-compatible with standard 74HC573?

Yes-pinout matches 20-pin SOIC 74HC573 (D0–D7, O0–O7, LE, OE, V_CC, GND), but electrical behavior differs: PI74LPT573AS has 5V-tolerant inputs, hysteresis, and higher drive strength (±24 mA vs. ±7.8 mA), enabling direct drop-in replacement where voltage translation is needed.

What is the maximum clock frequency supported for LE toggling?

There is no internal clock; LE is asynchronous. Maximum safe LE toggle rate depends on t_W(LE) = 6.0 ns minimum pulse width and t_SU/t_H = 2.0/1.5 ns. For reliable operation, LE should not toggle faster than ~80 MHz in worst-case timing scenarios with full process/voltage/temperature variation.

Does PI74LPT573AS require external pull-up or pull-down resistors on OE or LE?

No-OE and LE have TTL-compatible thresholds and hysteresis, so they can be driven directly from CMOS or TTL outputs. Pull resistors are unnecessary unless the driving source floats during reset; in such cases, a 10 kΩ pull-down on OE ensures default high-Z output state.

PI74LPT573AS Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: 74LPT

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

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: D-Type Transparent Latch

Circuit:: 8:8

Output Type:: Tri-State

Voltage - Supply:: 2.7V ~ 3.6V

Independent Circuits:: 1

Delay Time - Propagation:: 1.5ns

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

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

PI74LPT573AS FAQ

1.How can I place an order for PI74LPT573AS through Aetrix?

Please submit a Request for Quotation (RFQ) for PI74LPT573AS 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 PI74LPT573AS reliable?

The price and inventory of PI74LPT573AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74LPT573AS is usually 5 days.

3.What payment methods are accepted for PI74LPT573AS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74LPT573AS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI74LPT573AS?

PI74LPT573AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI74LPT573AS 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 PI74LPT573AS?

For technical support, including PI74LPT573AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74LPT573AS requirements.

6.How does Aetrix verify that PI74LPT573AS is sourced from the original manufacturer or authorized distributors?

All PI74LPT573AS 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 PI74LPT573AS meets industry standards.

7.What is the process for return or replacement of PI74LPT573AS?

All PI74LPT573AS units undergo pre-shipment inspection (PSI). If there is an issue with PI74LPT573AS, 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 PI74LPT573AS part is unused and in its original packaging.

Return procedure for PI74LPT573AS:

1.Submit a request within 90 days.

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

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