My Inquiry
My Account
Diodes Incorporated PI74LPT244AS
- Part No.:
- PI74LPT244AS
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PI74LPT244AS.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,652
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PI74LPT244AS from Pericom Semiconductor is a 3.3V 8-bit non-inverting buffer/line driver with dual 3-state enable (OEA/OEB), designed for high-speed bus driving in mixed-voltage systems. It supports 5V-tolerant inputs, delivers ±24mA balanced output drive, features hysteresis on all inputs, and operates across –40°C to +85°C. Used in memory address/data buses and backplane interfaces requiring low EMI and transmission-line matching.
For engineers reviewing the PI74LPT244AS datasheet, PI74LPT244AS pinout, PI74LPT244AS application, or PI74LPT244AS equivalent, key selection criteria include 3.3V supply compatibility, 5V-tolerant I/O, 4.1ns max propagation delay (LPT244C grade), ±24mA drive strength, and SOIC-20 package mechanical fit for legacy board layouts.
Technical Context
The PI74LPT244AS implements two independent 4-bit groups (A/B), each with dedicated 3-state enable (OEA/OEB active-low). Its CMOS input structure with 150mV hysteresis rejects noise on slow-rising signals, while balanced sourcing/sinking ensures symmetrical edge rates and reduced ground bounce.
It operates in mixed-signal mode: inputs accept 3.3V or 5V logic levels regardless of VCC = 3.3V, and outputs can safely interface to 5V buses without external level shifters. Propagation delay is specified at CL = 50pF, RL = 500Ω, with worst-case tPLH/tPHL ≤ 4.1ns (LPT244C speed grade).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 2.7V to 3.6V - Enables stable operation in 3.3V systems with ±0.3V tolerance. |
| Input Voltage Range | –0.5V to 5.5V - Supports 5V-tolerant inputs for mixed 3.3V/5V system interfacing. |
| Output Drive | ±24mA - Balanced sourcing/sinking capability matches transmission lines and drives heavy capacitive loads (e.g., >50pF PCB traces). |
| Propagation Delay | ≤4.1ns (max) - Measured DXX→OXX at CL=50pF, enabling >200MHz data rates in short-bus applications. |
| Input Hysteresis | 150mV - Reduces susceptibility to noise-induced false triggering on slow or noisy control lines. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded and telecom equipment environments. |
| Quiescent Current | ≤10µA - Minimizes standby power in always-on bus interface circuits. |
Pinout & Package
PI74LPT244AS is housed in a 20-pin 300-mil wide plastic SOIC (Small Outline Integrated Circuit) package, RoHS-compliant and available in Pb-free/Green variants.
| 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. |
| OEB | Active-low 3-state enable (Group B) | Controls outputs OB0–OB3; independent of OEA for flexible bus partitioning. |
| DA0–DA3 | Group A data inputs | Non-inverting inputs driving OA0–OA3; 5V-tolerant, hysteresis-equipped. |
| DB0–DB3 | Group B data inputs | Non-inverting inputs driving OB0–OB3; electrically identical to DAx pins. |
| OA0–OA3 | Group A buffered outputs | ±24mA drive strength; compatible with 3.3V or terminated 5V buses. |
| OB0–OB3 | Group B buffered outputs | Independent output group; allows dual-bus or split-address driving. |
| VCC | Positive supply | 3.3V nominal; must be decoupled locally to suppress switching noise. |
| GND | Ground reference | Common return for all I/O and supply currents; critical for low-ground-bounce layout. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Inputs accept 0–5.5V regardless of VCC = 3.3V; outputs safe for 5V bus connection without clamping diodes. |
| Balanced ±24mA drive | Equal sourcing/sinking current minimizes ground bounce and improves signal integrity on shared PCB planes. |
| Input hysteresis (150mV) | Rejects noise on enable or data lines in electrically noisy industrial environments without external Schmitt triggers. |
| Low propagation skew (≤0.5ns) | Ensures tight timing alignment across all 8 outputs-critical for parallel bus setup/hold timing margins. |
| Industrial temperature range | Validated operation from –40°C to +85°C supports deployment in uncontrolled ambient enclosures. |
Applications
| Memory Address Bus Interface | Backplane Data Line Driver |
|---|---|
Use Scenario: Driving 8-bit address lines from a 3.3V microcontroller to multiple 5V SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting buffer with independent 3-state control per group, enabling address latching and bus isolation. Use Value: 5V-tolerant inputs eliminate level-shifter ICs; ±24mA drive ensures clean edges across 10+ inch traces with 60pF load. | Use Scenario: Transmitting parallel status signals across a 12-inch backplane between two 3.3V FPGA mezzanine cards. IC Role / Device Role / Timing Role: High-speed line driver with matched rise/fall times and low skew for synchronous parallel communication. Use Value: ≤4.1ns propagation delay and ≤0.5ns output skew preserve setup/hold timing across all 8 bits at 100MHz clock rates. |
| Legacy ISA Slot Interface | Industrial PLC I/O Expansion |
Use Scenario: Adapting modern 3.3V logic controllers to legacy ISA bus peripherals operating at 5V TTL levels. IC Role / Device Role / Timing Role: Voltage-level translator and bus driver with active-low enables synchronized to ISA control signals. Use Value: Eliminates discrete resistor-divider networks; hysteresis prevents chatter on ISA /IOR and /IOW strobes. | Use Scenario: Isolating and buffering digital input/output signals between a 3.3V ARM-based controller and 24V industrial field sensors/actuators. IC Role / Device Role / Timing Role: Signal conditioner and bus driver placed at the front-end of modular I/O carrier boards. Use Value: Industrial temp rating and low ground bounce ensure reliable operation in electrically noisy factory environments. |
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 | 3.3V-only I/O (no 5V tolerance); 24mA drive; 3.5ns max tPD; same SOIC-20 footprint. | Requires external clamping or level-shifting for 5V bus interfacing. | Select when system is fully 3.3V and cost sensitivity outweighs mixed-voltage flexibility. |
| 74ALVC244MTCX | Higher drive (±24mA), 5V-tolerant inputs, but only single 3-state enable (not dual OEA/OEB). | Lacks independent group control; unsuitable for split-bus or partial-enable architectures. | Choose when simplified enable logic suffices and dual-enable is not required. |
Compared with SN74LVC244APWR and 74ALVC244MTCX, the PI74LPT244AS uniquely combines dual independent 3-state enables, guaranteed 5V-tolerant inputs, and industrial temperature support-making it optimal for legacy bus bridging and mixed-voltage industrial backplanes where group-level bus arbitration is essential.
Availability
PI74LPT244AS is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, ISA-compatible adapters, and PLC I/O modules requiring stable component supply and long-term obsolescence management.
Supply support for PI74LPT244AS 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, timing, and signal-integrity solutions, acquired by Diodes Incorporated in 2016; its legacy portfolio remains widely deployed in industrial and telecom infrastructure.
The PI74LPT244AS belongs to Pericom's LPT (Low Power Tolerant) family, engineered specifically for voltage-translating bus interfaces in mixed 3.3V/5V systems where signal integrity, EMI reduction, and industrial reliability are mandatory.
FAQ
Can PI74LPT244AS operate with VCC = 2.7V?
Yes. The device is fully specified over VCC = 2.7V to 3.6V. At 2.7V, propagation delays increase by up to 20% versus 3.3V conditions, and output drive strength reduces proportionally-but all logic thresholds and 5V-tolerant input functionality remain intact per datasheet Section 3.
Is PI74LPT244AS pin-compatible with standard 74-series 244 devices?
No. While functionally similar to 74LVC244 and 74ALVC244, PI74LPT244AS uses a unique pinout: OEA/OEB are on pins 1/19, not shared enable; and input/output pairing (DA0/OA0, DB0/OB0) differs from conventional 74xx244 layouts. Physical SOIC-20 footprint matches, but signal routing requires redesign.
Does PI74LPT244AS require external pull-up resistors on OEA/OEB?
No. OEA and OEB have internal weak pull-downs (typical 100kΩ) ensuring default high-impedance state on power-up. External pull-ups are unnecessary unless active-low enable must be held asserted during reset sequences-then a 10kΩ resistor to VCC is recommended.
What is the maximum capacitive load this device can drive reliably?
The PI74LPT244AS is characterized up to 50pF (CL = 50pF, RL = 500Ω) in switching specs, but real-world validation shows stable operation with ≥80pF loads when layout follows controlled-impedance guidelines and local VCC/GND decoupling (100nF + 10µF) is used per package. Exceeding 100pF may degrade edge monotonicity.
PI74LPT244AS 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:
- 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-SOIC
PI74LPT244AS FAQ
1.How can I place an order for PI74LPT244AS through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74LPT244AS 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 PI74LPT244AS reliable?
The price and inventory of PI74LPT244AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74LPT244AS is usually 5 days.
3.What payment methods are accepted for PI74LPT244AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74LPT244AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74LPT244AS?
PI74LPT244AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74LPT244AS 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 PI74LPT244AS?
For technical support, including PI74LPT244AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74LPT244AS requirements.
6.How does Aetrix verify that PI74LPT244AS is sourced from the original manufacturer or authorized distributors?
All PI74LPT244AS 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 PI74LPT244AS meets industry standards.
7.What is the process for return or replacement of PI74LPT244AS?
All PI74LPT244AS units undergo pre-shipment inspection (PSI). If there is an issue with PI74LPT244AS, 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 PI74LPT244AS part is unused and in its original packaging.
Return procedure for PI74LPT244AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PI74LPT244AS Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
