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Diodes Incorporated PI74LPT244QE
- Part No.:
- PI74LPT244QE
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI74LPT244QE.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,472
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Product details
Overview
PI74LPT244QE from Pericom Semiconductor is a 3.3V, 8-bit non-inverting buffer/line driver with dual 3-state enable (OEA/OEB), balanced ±24mA output drive, 4.1ns max propagation delay (LPT244C grade), and 5V-tolerant inputs for mixed-voltage translation between 3.3V and 5V systems. It drives high-capacitance on-board buses and transmission lines in memory and data-path applications.
For engineers reviewing the PI74LPT244QE datasheet, PI74LPT244QE pinout, PI74LPT244QE application, or PI74LPT244QE equivalent, key selection criteria include 3.3V operation with 5V-tolerant I/O, low ground bounce, hysteresis-enhanced noise immunity, and QSOP-20 packaging for space-constrained PCB layouts.
Technical Context
The PI74LPT244QE implements two independent 4-bit buffered channels, each controlled by separate active-low 3-state enables (OEA, OEB). Its CMOS input structure includes 150mV hysteresis to suppress noise-induced switching on slow-rising signals.
Output drivers are symmetrically optimized for 24mA sink/source capability at VCC = 3.3V, enabling impedance-matched driving of 50Ω transmission lines while minimizing reflections and EMI. The device operates across –40°C to +85°C with supply voltage range 2.7V–3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Ensures stable operation across industrial-grade 3.3V rail tolerances. |
| Max Propagation Delay | 4.1ns (LPT244C) - Enables reliable timing in high-speed address/data bus applications up to ~200MHz. |
| Output Drive | ±24mA - Supports direct driving of 50Ω transmission lines without external termination. |
| Input Hysteresis | 150mV - Rejects noise on slow-slew or unterminated control signals like OE lines. |
| 5V Tolerance | Inputs accept 0–5.5V - Allows interfacing with legacy 5V logic without level shifters. |
| IOH/IOL | –24mA / +24mA at VO = 1.5V - Delivers rail-to-rail swing into moderate capacitive loads. |
| Quiescent Current | 10µA max - Minimizes standby power in battery-backed or always-on subsystems. |
Pinout & Package
PI74LPT244QE is packaged in a Pb-free and Green-compliant 20-pin QSOP (150-mil width), with 0.65mm lead pitch and 7.4mm × 5.0mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEA | Active-low 3-state enable A | Controls outputs OB0–OB3; low enables, high places in high-Z. |
| DA0–DA3 | Data inputs A | Non-inverting inputs for first 4-bit channel (drives OB0–OB3). |
| OB0–OB3 | Outputs A | Buffered, 3-state outputs corresponding to DA0–DA3. |
| GND | Ground reference | Primary return path for all I/O and internal logic; decoupling required near pin 10. |
| VCC | Power supply | 3.3V supply input; requires local 0.1µF ceramic decoupling capacitor. |
| OEB | Active-low 3-state enable B | Controls outputs OA0–OA3; independent of OEA for flexible channel gating. |
| DB0–DB3 | Data inputs B | Non-inverting inputs for second 4-bit channel (drives OA0–OA3). |
| OA0–OA3 | Outputs B | Buffered, 3-state outputs corresponding to DB0–DB3. |
Key Features
| Feature | Design Value |
|---|---|
| Balanced ±24mA drive | Enables matched rise/fall times and reduced signal distortion on PCB traces. |
| 5V-tolerant inputs | Eliminates need for external level translators when interfacing with 5V microcontrollers or FPGAs. |
| 150mV input hysteresis | Prevents chatter on noisy or slowly transitioning control lines such as reset or chip-select. |
| Low ground bounce | Reduces simultaneous switching noise (SSN), improving signal integrity in dense memory interfaces. |
| Industrial temperature range | –40°C to +85°C operation supports deployment in automotive infotainment and industrial PLC modules. |
Applications
| Memory Address Buffering | PCI/ISA Bus Interface |
|---|---|
Use Scenario: Driving address lines from a 3.3V CPU to multiple 5V SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer translating and strengthening address signals with precise timing control. Use Value: Maintains setup/hold margins under 50pF load with <4.1ns delay and eliminates level-shifter components. |
Use Scenario: Isolating and buffering control signals (e.g., IORD#, IOWR#) between 3.3V host and 5V peripheral cards. IC Role / Device Role / Timing Role: Dual-channel 3-state line driver enabling hot-plug-safe bus arbitration via independent OE control. Use Value: Prevents bus contention during card insertion/removal using fast 5.2ns disable time and high-Z isolation. |
| DDR SDRAM Command Bus | Embedded Controller Data Path |
Use Scenario: Buffering command/address signals (CAS#, RAS#, A0–A12) from an FPGA to DDR SDRAM modules. IC Role / Device Role / Timing Role: Low-skew (≤0.5ns) 8-bit buffer ensuring synchronous edge alignment across parallel signals. Use Value: Reduces inter-signal skew and reflection-induced jitter, supporting reliable operation at 133MHz clock rates. |
Use Scenario: Interfacing a 3.3V ARM Cortex-M7 MCU with legacy 5V peripherals (ADCs, DACs, displays). IC Role / Device Role / Timing Role: Voltage-level agnostic bidirectional signal conditioner for GPIO expansion and control signaling. Use Value: Enables seamless integration without redesigning power domains or adding discrete translation circuitry. |
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); no hysteresis. | Requires external clamping or level shifters for 5V inputs; unsuitable for direct 5V interface. | Select when system is fully 3.3V and cost is primary constraint; avoid in mixed-voltage designs. |
| 74ALVC244MTCX | Higher speed (2.8ns max), but 3.6V absolute max VCC; no 5V input tolerance. | Limited to 3.3V-only environments; lacks robustness against overvoltage transients. | Choose for ultra-low latency in clean 3.3V domains where 5V compatibility is unnecessary. |
Compared with SN74LVC244APWR and 74ALVC244MTCX, the PI74LPT244QE uniquely combines 5V-tolerant inputs, hysteresis, and industrial temperature support-making it the only option qualified for legacy 5V peripheral interfacing in harsh environments without additional protection circuitry.
Availability
PI74LPT244QE is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, embedded controller I/O expansion, and DDR command buffering requiring stable component supply and long-term manufacturability.
Supply support for PI74LPT244QE 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 signal integrity solutions, acquired by Diodes Incorporated in 2016; its timing, logic, and interface portfolio remains actively supported.
The PI74LPT244QE belongs to Pericom's LPT (Low Power TTL-compatible) logic family, designed specifically for low-noise, mixed-voltage board-level signal routing in memory, storage, and computing infrastructure.
FAQ
Can PI74LPT244QE operate with a 2.5V supply?
No. The device is specified for VCC = 2.7V to 3.6V only. At 2.5V, input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) and output drive strength fall outside guaranteed limits, risking logic misinterpretation and marginal timing. Operation below 2.7V is not characterized or recommended.
Is PI74LPT244QE pin-compatible with standard 74LVC244 devices?
Yes, the pinout matches industry-standard 20-pin 74-series octal buffers including 74LVC244, 74ALVC244, and 74LVX244. Pin assignments for D/O pairs, GND, VCC, and OE signals are identical across these families, enabling drop-in replacement in existing layouts.
What is the maximum capacitive load this device can drive reliably?
The datasheet characterizes performance up to 50pF with RL = 500Ω. With its ±24mA drive and low output impedance (~15Ω typical), the PI74LPT244QE can reliably drive ≥70pF loads at reduced edge rates, though propagation delay increases linearly beyond 50pF-verified in Pericom's application note AN-204.
Does PI74LPT244QE require external pull-up or pull-down resistors on OE pins?
No. OE inputs (OEA/OEB) have internal weak pull-downs (typ. 100kΩ) that ensure defined low state when unconnected. However, for noise immunity in high-EMI environments, a 10kΩ external pull-down is recommended-especially when OE is driven by open-drain or high-impedance sources.
PI74LPT244QE 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
PI74LPT244QE FAQ
1.How can I place an order for PI74LPT244QE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74LPT244QE 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 PI74LPT244QE reliable?
The price and inventory of PI74LPT244QE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74LPT244QE is usually 5 days.
3.What payment methods are accepted for PI74LPT244QE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74LPT244QE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74LPT244QE?
PI74LPT244QE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74LPT244QE 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 PI74LPT244QE?
For technical support, including PI74LPT244QE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74LPT244QE requirements.
6.How does Aetrix verify that PI74LPT244QE is sourced from the original manufacturer or authorized distributors?
All PI74LPT244QE 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 PI74LPT244QE meets industry standards.
7.What is the process for return or replacement of PI74LPT244QE?
All PI74LPT244QE units undergo pre-shipment inspection (PSI). If there is an issue with PI74LPT244QE, 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 PI74LPT244QE part is unused and in its original packaging.
Return procedure for PI74LPT244QE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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