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Diodes Incorporated PI74LPT373AQ
- Part No.:
- PI74LPT373AQ
- Manufacturer:
- Diodes Incorporated
- Category:
- Latches
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI74LPT373AQ.pdf
- Description:
- IC D-TYPE TRANSP SGL 8:8 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,672
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Product details
Overview
PI74LPT373AQ from Pericom Semiconductor is an 8-bit transparent latch with 3-state outputs, designed for bus-oriented data latching in mixed-voltage systems. It operates at 3.3V supply (2.7–3.6V), supports 5V-tolerant inputs/outputs, delivers ±24 mA drive strength, and features 4.2 ns max propagation delay (LPT373C grade) with industrial temperature range (–40°C to +85°C). Used in 3.3/5.0V level translation on shared data buses.
For engineers reviewing the PI74LPT373AQ datasheet, PI74LPT373AQ pinout, PI74LPT373AQ application, or PI74LPT373AQ equivalent, key selection criteria include 3-state output control timing (tPZH/tPHZ), 5V-tolerant I/O compatibility, low ground bounce, hysteresis on all inputs, and TSSOP-20 package footprint for high-density PCB layouts.
Technical Context
The PI74LPT373AQ implements a dual-control transparent latch architecture: LE (active-HIGH) enables real-time data pass-through, while OE (active-LOW) independently controls 3-state output enable/disable. Its CMOS input structure includes hysteresis (150 mV) for noise immunity, and outputs are rated for ±24 mA sink/source with balanced drive capability.
Designed for voltage translation, the device accepts 3.3V or 5.0V logic inputs and drives either 3.3V buses or 5.0V-tolerant loads without external level shifters. It meets industrial reliability requirements with –40°C to +85°C operation, 1.0W max power dissipation, and 5.5V absolute max input voltage rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 3.6V - ensures stable operation in 3.3V nominal systems with ±10% rail tolerance |
| Propagation Delay (tPLH/tPHL) | Max 4.2 ns (LPT373C) - enables >200 MHz bus toggle rates with tight timing margins |
| Output Drive Strength | ±24 mA - supports direct driving of multiple LVTTL/LVCMOS loads without buffers |
| Input Hysteresis | 150 mV - rejects noise on slow-rising or noisy control signals like LE/OE |
| 5V-Tolerant I/O | Inputs accept 0–5.5V; outputs tolerate 5V bus connection - eliminates external level translators in mixed-voltage designs |
| Operating Temperature | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
| Power Dissipation | 1.0 W max - defines thermal design margin for continuous operation in compact enclosures |
Pinout & Package
PI74LPT373AQ is packaged in a 20-pin plastic TSSOP (173 mil wide), designated as "L" package per Pericom documentation. Pin pitch is 0.65 mm, body width 4.4 mm, and it is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive power supply | 3.3V supply input; must be decoupled locally to suppress switching noise |
| GND | Ground reference | Common return path for all I/O and internal logic; requires low-inductance connection |
| D0–D7 | Data inputs | Asynchronous parallel data inputs; accept 3.3V or 5V logic levels |
| O0–O7 | 3-state outputs | Bi-directional bus drivers; high-impedance when OE = HIGH |
| LE | Latch Enable (active-HIGH) | When HIGH, passes Dn to On; when LOW, latches current Dn value |
| OE | Output Enable (active-LOW) | When LOW, enables O0–O7; when HIGH, places all outputs in high-Z state |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant mixed-signal operation | Enables direct interface between 3.3V controllers and legacy 5V peripherals without external translators |
| Balanced ±24 mA output drive | Supports fan-out to ≥10 LVTTL loads or ≥20 LVCMOS loads under worst-case VCC and temperature |
| Low ground bounce outputs | Reduces simultaneous switching noise (SSN), critical for signal integrity in high-speed bus environments |
| Hysteresis on all inputs | 150 mV threshold margin prevents false triggering from EMI or slow-edge control signals |
| Industrial temperature range | Validated operation from –40°C to +85°C ensures reliability in uncontrolled ambient environments |
Applications
| Industrial PLC Backplane Interface | Embedded CPU Data Bus Isolation |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from field I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: 8-bit transparent latch buffers bidirectional data during bus arbitration cycles; OE synchronizes with bus grant signals. Use Value: Enables deterministic bus handoff between 3.3V CPU and 5V I/O modules using single-supply 3.3V logic with no level-shifter overhead. |
Use Scenario: Temporarily holding memory-mapped peripheral register values during CPU interrupt servicing. IC Role / Device Role / Timing Role: Latches status/control bits from peripheral devices while CPU executes ISR code; LE timed to bus cycle boundaries. Use Value: Prevents spurious peripheral writes during context switches by freezing register access until CPU resumes polling. |
| Legacy Peripheral Adapter Card | Test Equipment Digital Pattern Generator |
|
Use Scenario: Adapting modern FPGA-based controllers to legacy ISA or PCI add-in cards requiring 5V signaling. IC Role / Device Role / Timing Role: Translates 3.3V FPGA outputs to 5V-tolerant bus drivers; OE controlled by card-select decode logic. Use Value: Eliminates discrete resistor networks or dedicated level translators, reducing BOM count and board area. |
Use Scenario: Generating synchronized digital stimulus patterns for IC functional testing across mixed-voltage DUTs. IC Role / Device Role / Timing Role: Holds pattern words from test controller FIFO; LE strobed by pattern clock, OE gated per vector sequence. Use Value: Provides sub-5 ns setup/hold timing margin for high-speed pattern delivery into 5V or 3.3V 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 |
|---|---|---|---|
| SN74LVC373APWR | Lower VCC range (1.65–3.6V); no 5V-tolerant inputs - requires external clamping for 5V bus interfacing | Optimized for pure 3.3V/2.5V systems; lacks mixed-voltage translation capability | Select when system uses only 3.3V peripherals and lower static power (ICC = 1 µA typical) is prioritized |
| 74ALVC373MTCX | Faster tPD (3.2 ns max); higher drive (±24 mA same); but only 3.6V max input - not 5V-tolerant | Targeted at high-speed 3.3V-only bus applications where timing margin is critical | Choose for sub-4 ns timing-critical paths where 5V compatibility is unnecessary and board space is constrained |
Compared with SN74LVC373APWR and 74ALVC373MTCX, PI74LPT373AQ uniquely supports true 3.3V/5.0V mixed-system interfacing without external components, trading minor propagation delay penalty for significant system-level simplification in heterogeneous voltage environments.
Availability
PI74LPT373AQ is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded CPU bus isolation, legacy peripheral adapter cards, and test equipment digital pattern generators requiring stable component supply and long-term lifecycle support.
Supply support for PI74LPT373AQ 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 and signal integrity solutions, acquired by Diodes Incorporated in 2016. Known for low-jitter clock devices and robust logic families.
The PI74LPT series targets mixed-voltage digital systems, delivering speed-optimized 3.3V logic with 5V-tolerant I/O to simplify migration from legacy 5V architectures to modern low-voltage controllers.
FAQ
Can PI74LPT373AQ operate with a 5.0V supply?
No. The device is specified for VCC = 2.7V to 3.6V only. Applying 5.0V to VCC exceeds the absolute maximum rating of +7.0V on pins relative to GND, but violates the functional operating range and risks permanent damage. Its 5V tolerance applies only to input and output signal pins-not the power rail.
What is the minimum LE pulse width required for reliable latching?
The minimum LE HIGH pulse width is 5.0 ns (LPT373C grade). This ensures sufficient time for internal metastability resolution and guarantees capture of Dn data meeting setup/hold requirements. Shorter pulses may result in indeterminate output states or partial bit latching.
How does the hysteresis improve noise immunity on LE and OE inputs?
The 150 mV hysteresis creates distinct HIGH and LOW thresholds (e.g., VIH ≈ 2.2V, VIL ≈ 0.8V), preventing oscillation during slow or noisy transitions. This is especially critical for OE, where marginal noise could cause unintended bus contention or floating states during enable/disable transitions.
Is PI74LPT373AQ pin-compatible with standard 74LS373 or 74HC373 packages?
No. While functionally similar, PI74LPT373AQ uses a 20-pin TSSOP (173 mil) footprint, whereas 74LS373 and 74HC373 commonly use 20-pin SOIC (300 mil) or PDIP packages. Physical mounting and PCB layout are not interchangeable; adapter boards or redesign are required for drop-in replacement.
PI74LPT373AQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74LPT
- Package/Case:
- 20-SSOP (0.154", 3.90mm 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-QSOP
PI74LPT373AQ FAQ
1.How can I place an order for PI74LPT373AQ through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74LPT373AQ 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 PI74LPT373AQ reliable?
The price and inventory of PI74LPT373AQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74LPT373AQ is usually 5 days.
3.What payment methods are accepted for PI74LPT373AQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74LPT373AQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74LPT373AQ?
PI74LPT373AQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74LPT373AQ 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 PI74LPT373AQ?
For technical support, including PI74LPT373AQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74LPT373AQ requirements.
6.How does Aetrix verify that PI74LPT373AQ is sourced from the original manufacturer or authorized distributors?
All PI74LPT373AQ 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 PI74LPT373AQ meets industry standards.
7.What is the process for return or replacement of PI74LPT373AQ?
All PI74LPT373AQ units undergo pre-shipment inspection (PSI). If there is an issue with PI74LPT373AQ, 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 PI74LPT373AQ part is unused and in its original packaging.
Return procedure for PI74LPT373AQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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