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Diodes Incorporated PI74LPT244AQ
- Part No.:
- PI74LPT244AQ
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI74LPT244AQ.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,871
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Product details
Overview
PI74LPT244AQ from Pericom Semiconductor is a 3.3V, 8-bit non-inverting buffer/line driver in 20-pin QSOP package, featuring dual 3-state enable (OEA/OEB), ±24mA balanced output drive, 1.5–4.8ns propagation delay (CL = 50pF), and 5V-tolerant inputs for mixed-voltage translation between 3.3V and 5V buses. It is used in high-speed memory bus driving and on-board transmission line interfacing.
For engineers reviewing the PI74LPT244AQ datasheet, PI74LPT244AQ pinout, PI74LPT244AQ application, or PI74LPT244AQ equivalent, key selection criteria include 3-state timing (tPZH/tPHZ ≤ 5.8/5.2ns), input hysteresis (150mV), industrial temperature range (–40°C to +85°C), 5V-tolerant I/O compatibility, and QSOP-20 mechanical footprint validation.
Technical Context
This device implements two independent 4-bit groups (A/B), each with dedicated 3-state enable (OEA/OEB active-low), enabling selective bus isolation. All inputs feature Schmitt-trigger hysteresis (150mV) to suppress noise-induced switching in noisy digital environments.
It operates across VCC = 2.7V–3.6V, supports 5V-tolerant inputs regardless of supply voltage, and delivers matched source/sink drive (–24mA/24mA) to minimize ground bounce and signal reflections on controlled-impedance traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Ensures stable operation in 3.3V systems with ±0.3V tolerance; not rated for 5V supply. |
| Propagation Delay | 1.5–4.8ns (tPLH/tPHL, CL = 50pF) - Enables reliable timing in >200MHz bus applications with tight skew control. |
| Output Drive | ±24mA (IOH/IOL) - Provides balanced drive strength to reduce ground bounce and improve transmission line matching. |
| Input Hysteresis | 150mV - Increases noise immunity on asynchronous control lines like OEA/OEB in electrically noisy PCBs. |
| 5V Tolerance | Inputs accept 0–5.5V regardless of VCC - Allows direct interfacing with legacy 5V logic without level shifters. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded and telecom infrastructure deployments. |
Pinout & Package
Package: 20-pin QSOP (Q), 150-mil body width, 0.65mm lead pitch, Pb-free & Green compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEA | Active-low 3-state enable (Group A) | Controls outputs OA0–OA3; low enables, high places in high-impedance state. |
| DA0–DA3 | Input pins (Group A) | Non-inverting data inputs for OA0–OA3; 5V-tolerant, hysteresis-equipped. |
| OA0–OA3 | Output pins (Group A) | Buffered, 3-state outputs with ±24mA drive; matched impedance for transmission line termination. |
| GND | Ground reference | Dedicated power return path; critical for minimizing ground bounce in high-speed switching. |
| VCC | Positive supply | 3.3V nominal supply; powers internal logic and output drivers; decoupling required per layout guidelines. |
| OEB | Active-low 3-state enable (Group B) | Controls outputs OB0–OB3; independent of OEA for flexible bus partitioning. |
| DB0–DB3 | Input pins (Group B) | Non-inverting data inputs for OB0–OB3; identical electrical specs to DAx group. |
| OB0–OB3 | Output pins (Group B) | Buffered, 3-state outputs with same drive strength and timing as OAx group. |
Key Features
| Feature | Design Value |
|---|---|
| Balanced ±24mA output drive | Reduces ground bounce and differential EMI by equalizing sink/source current transients. |
| 5V-tolerant inputs at 3.3V VCC | Eliminates external level translators when interfacing with 5V microcontrollers or FPGAs. |
| 150mV input hysteresis | Prevents chatter on enable/control lines in presence of slow-rising or noisy signals. |
| Low propagation skew (≤0.5ns) | Ensures simultaneous switching across all 8 outputs-critical for parallel bus integrity. |
Applications
| Memory Bus Driver | Level Translation Interface |
|---|---|
Use Scenario: Driving SRAM or Flash memory address/data buses on 3.3V controller boards with legacy 5V peripherals. IC Role / Device Role / Timing Role: Non-inverting buffer with dual 3-state enables isolates memory segments and prevents bus contention during read/write cycles. Use Value: ±24mA drive ensures fast edge rates into 50pF loads; 5V-tolerant inputs accept address strobes directly from 5V CPLDs. |
Use Scenario: Interfacing a 3.3V FPGA I/O bank to a 5V sensor interface or industrial I/O module. IC Role / Device Role / Timing Role: Voltage-level translator with directionless, non-inverting signal conditioning and bus hold capability. Use Value: Eliminates discrete resistor-divider networks; hysteresis prevents metastability on asynchronous control lines. |
| Backplane Signal Buffer | Industrial Control Bus Isolator |
Use Scenario: Re-driving clock and data signals across long PCB traces (>10cm) in modular PLC backplanes. IC Role / Device Role / Timing Role: Transmission-line-matched buffer minimizing reflections and maintaining signal integrity at 100+ MHz. Use Value: Low ground bounce and matched drive reduce jitter accumulation; tPLH/tPHL ≤ 4.8ns supports >200MHz data rates. |
Use Scenario: Isolating fieldbus communication lines (e.g., RS-485 control signals) from MCU GPIOs in factory automation controllers. IC Role / Device Role / Timing Role: 3-state-enabled signal conditioner that decouples MCU I/O from noisy industrial bus transceivers. Use Value: Independent OEA/OEB allows dynamic segment enable/disable; industrial temp rating ensures reliability in uncooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower drive (±24mA same), but only 3.3V-tolerant inputs (not 5V-tolerant); no input hysteresis. | Requires external pull-ups or Schmitt triggers for noisy enable lines; unsuitable for direct 5V input interfacing. | Select only if system uses exclusively 3.3V logic and noise environment is controlled. |
| 74ALVC244MTCX | Higher speed (tPD ≤ 3.3ns), same 5V-tolerant I/O, but no guaranteed hysteresis spec; lower ICCD (40µA/MHz). | Marginally better timing margin but lacks hysteresis assurance-requires board-level noise mitigation. | Prefer when maximum speed is critical and enable signal integrity is ensured externally. |
Compared with SN74LVC244APWR and 74ALVC244MTCX, PI74LPT244AQ uniquely combines guaranteed 150mV hysteresis, full 5V input tolerance at 3.3V VCC, and balanced drive-making it optimal for mixed-voltage industrial bus interfaces where noise and voltage translation coexist.
Availability
PI74LPT244AQ is available at Aetrix Electronics and suitable for memory bus driving, industrial control bus isolation, and mixed-voltage level translation requiring stable component supply and long-term lifecycle support.
Supply support for PI74LPT244AQ 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-speed interface and timing solutions, acquired by Diodes Incorporated in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.
The PI74LPT family targets low-power, high-speed bus buffering in mixed-voltage systems, emphasizing noise immunity, translation capability, and transmission-line signal integrity for embedded memory and control applications.
FAQ
Can PI74LPT244AQ operate with a 5V supply?
No. PI74LPT244AQ is specified only for VCC = 2.7V–3.6V. Its internal circuitry is optimized for 3.3V operation; applying 5V to VCC exceeds absolute maximum ratings and risks permanent damage. However, its inputs tolerate up to 5.5V regardless of VCC, enabling safe interfacing with 5V signal sources.
What is the function of the two enable pins (OEA and OEB)?
OEA controls the 3-state output buffer for OA0–OA3; OEB controls OB0–OB3. Both are active-low. When asserted low, their respective 4-bit output groups drive; when high, outputs enter high-impedance state. This allows independent segmentation of an 8-bit bus-for example, isolating upper/lower nibbles during DMA transfers.
Does PI74LPT244AQ require external pull-up or pull-down resistors on inputs?
No-inputs include built-in Schmitt-trigger hysteresis (150mV), eliminating need for external biasing on control lines like OEA/OEB. For data inputs (DAx/DBx), pull-ups are unnecessary unless the driving source floats during reset; hysteresis ensures clean transitions even with slow-rising signals.
How does PI74LPT244AQ compare to standard LVT or LCX family buffers?
PI74LPT244AQ is pin- and function-compatible with LCX/LVT families but adds 5V-tolerant inputs and guaranteed hysteresis-features absent in baseline LCX/LVT parts. It also achieves lower ground bounce via balanced drive, making it superior for high-density PCBs where signal integrity and EMI are critical.
PI74LPT244AQ 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:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
PI74LPT244AQ FAQ
1.How can I place an order for PI74LPT244AQ through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74LPT244AQ 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 PI74LPT244AQ reliable?
The price and inventory of PI74LPT244AQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74LPT244AQ is usually 5 days.
3.What payment methods are accepted for PI74LPT244AQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74LPT244AQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74LPT244AQ?
PI74LPT244AQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74LPT244AQ 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 PI74LPT244AQ?
For technical support, including PI74LPT244AQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74LPT244AQ requirements.
6.How does Aetrix verify that PI74LPT244AQ is sourced from the original manufacturer or authorized distributors?
All PI74LPT244AQ 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 PI74LPT244AQ meets industry standards.
7.What is the process for return or replacement of PI74LPT244AQ?
All PI74LPT244AQ units undergo pre-shipment inspection (PSI). If there is an issue with PI74LPT244AQ, 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 PI74LPT244AQ part is unused and in its original packaging.
Return procedure for PI74LPT244AQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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