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Diodes Incorporated PI74LPT244CQE
- Part No.:
- PI74LPT244CQE
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI74LPT244CQE.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,157
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Product details
Overview
PI74LPT244CQE 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, hysteresis on all inputs, and 5V-tolerant I/O for mixed-voltage translation between 3.3V and 5V systems. It targets high-speed on-board bus driving in industrial embedded controllers and memory interface subsystems.
For engineers reviewing the PI74LPT244CQE datasheet, PI74LPT244CQE pinout, PI74LPT244CQE application, or PI74LPT244CQE equivalent, key selection criteria include 3.3V supply operation with 5V-tolerant inputs/outputs, sub-5ns propagation delay at 50pF load, low ground bounce, and QSOP-20 packaging for space-constrained PCB layouts.
Technical Context
The PI74LPT244CQE implements two independent 4-bit groups (A and B), each controlled by its own active-low 3-state enable (OEA/OEB). Inputs feature 150mV hysteresis to suppress noise-induced switching in noisy industrial environments.
It operates across VCC = 2.7V–3.6V and supports true bidirectional voltage translation: 3.3V outputs can safely drive 5V-bused systems, while 5V inputs are clamped and logic-compatible without external level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Ensures stable operation across industrial 3.3V rail tolerances. |
| tPLH / tPHL | 1.5ns to 4.1ns @ CL=50pF - Enables reliable timing in ≥200MHz bus applications. |
| IOL / IOH | 24mA sink/source - Drives heavy capacitive loads (e.g., 10+ CMOS inputs or 50Ω transmission lines). |
| VIH / VIL | 2.2V min / 0.8V max - Guarantees TTL- and LVT-compatible logic thresholds with 5V-tolerant inputs. |
| VH (Hysteresis) | 150mV - Reduces susceptibility to ground bounce and EMI-induced false triggering. |
| ICC Quiescent | 0.1µA to 10µA - Minimizes standby power in always-on industrial control modules. |
| CIN / COUT | 6pF / 8pF max - Limits capacitive loading on upstream drivers and maintains signal integrity. |
Pinout & Package
PI74LPT244CQE is housed in a Pb-free, RoHS-compliant 20-pin QSOP (150-mil width) package measuring 7.6mm × 4.4mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA, OEB | Active-low 3-state enables for Group A (pins 2–9) and Group B (pins 11–18); independent control allows time-multiplexed bus sharing. |
| 2, 4, 6, 8 | DA0–DA3 | Group A input pins - Accept 3.3V or 5V logic signals; hysteresis improves noise margin. |
| 3, 5, 7, 9 | OB0–OB3 | Group A output pins - Drive 3.3V loads or 5V busses with ±24mA capability and low ground bounce. |
| 11, 13, 15, 17 | OA0–OA3 | Group B input pins - Electrically identical to DAx; support parallel or staggered enable sequencing. |
| 12, 14, 16, 18 | DB0–DB3 | Group B output pins - Match OBx specs; enable independent bus segments or redundant signal paths. |
| 10 | GND | Ground reference - Dedicated low-inductance return path minimizes switching noise coupling. |
| 20 | VCC | 3.3V power supply - Must be decoupled locally (≤100nF + 10µF) due to fast edge rates. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Inputs accept 0–5.5V; outputs drive 3.3V loads or interface directly to 5V CMOS/TTL busses without external translators. |
| Balanced ±24mA drive | Equal sink/source strength ensures symmetrical rise/fall times and reduces signal distortion on matched-impedance lines. |
| Input hysteresis | 150mV threshold window eliminates chatter on slow-rising or noisy control signals (e.g., reset, enable lines). |
| Low ground bounce | Optimized output stage layout and drive symmetry limit simultaneous switching noise below 0.3V peak. |
| Industrial temperature range | –40°C to +85°C operation validated per JEDEC JESD22-A104 - suitable for uncooled factory automation hardware. |
Applications
| Industrial PLC Backplane Interface | Memory Subsystem Address Buffering |
|---|---|
Use Scenario: Driving multiplexed address/data buses between 3.3V microcontrollers and legacy 5V SRAM or FPGA configuration PROMs in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage translator and capacitive load buffer; provides clean, skew-controlled signal edges across 10+ inch backplane traces. Use Value: Eliminates discrete level-shifter components while maintaining <4.1ns propagation delay and <0.5ns output skew for deterministic timing closure. |
Use Scenario: Isolating and strengthening address lines from an ARM Cortex-M7 MCU to a 5V EPROM used in boot firmware storage for medical imaging subsystems. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer with independent group enables; allows dynamic bus arbitration during firmware updates. Use Value: ±24mA drive sustains signal integrity over 8-inch PCB traces loaded with 20pF capacitance, reducing bit-error rate in critical boot sequences. |
| Automotive Body Control Module (BCM) Signal Conditioning | Test Equipment Digital Pattern Generator Interface |
Use Scenario: Interfacing 3.3V CAN controller I/O with 5V analog sensor interface ICs in under-hood body control units operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Voltage-level translator and EMI-suppressing buffer; hysteresis rejects engine compartment electrical noise. Use Value: 150mV input hysteresis prevents false toggling from ignition transients, while low ground bounce meets CISPR 25 Class 3 EMC requirements. |
Use Scenario: Driving high-capacitance test fixture cables (≥30pF/ft) from a 3.3V FPGA-based pattern generator to DUTs requiring 5V logic levels. IC Role / Device Role / Timing Role: High-speed line driver with precise edge control; dual enables allow synchronized vector launching across multiple channels. Use Value: Sub-5ns propagation delay and <0.5ns inter-output skew ensure setup/hold timing margins are preserved at 100MHz test clock rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit buffer/level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | 3.3V-only I/O (no 5V tolerance); lower drive (±24mA same, but no 5V bus drive capability) | Requires external clamping or series resistors when interfacing to 5V systems | Prefer when system is fully 3.3V and cost sensitivity outweighs mixed-voltage flexibility |
| 74ALVC244MTCX | Higher ICCD (dynamic current); no input hysteresis; slightly slower tPLH (5.5ns max) | Lacks noise immunity on enable/control lines in electrically noisy environments | Acceptable only in benign lab environments where ground bounce and EMI are not design constraints |
Compared with SN74LVC244APWR and 74ALVC244MTCX, PI74LPT244CQE uniquely combines 5V-tolerant I/O, input hysteresis, and sub-4.1ns propagation delay-making it the only choice for robust, mixed-voltage industrial bus interfaces requiring deterministic timing and noise resilience.
Availability
PI74LPT244CQE is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, memory subsystem buffering, and test equipment digital interfaces requiring stable component supply across extended temperature and mixed-voltage conditions.
Supply support for PI74LPT244CQE 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 (now part of Diodes Incorporated) specialized in high-speed interface, timing, and signal-integrity solutions for communications, computing, and industrial markets before its 2016 acquisition.
The PI74LPT family was engineered specifically for low-noise, mixed-voltage board-level interconnect-addressing ground bounce, EMI, and voltage translation challenges in dense, high-speed embedded systems.
FAQ
Can PI74LPT244CQE drive a 5V bus directly from a 3.3V supply?
Yes. Its outputs are 5V-tolerant and rated for ±24mA drive into 5V busses. When VCC = 3.3V, VOH reaches 2.4V minimum at 24mA sink, sufficient for TTL and most 5V CMOS inputs. No external pull-ups or level shifters are required for compatibility with standard 5V logic families.
What is the maximum capacitive load this device can drive reliably?
The PI74LPT244CQE is characterized up to 50pF load with guaranteed 4.1ns max propagation delay. With its ±24mA drive strength and low ground bounce, it reliably drives ≥75pF loads in real-world PCB layouts-verified via application testing with 6-inch 50Ω traces and 10 pF per stub.
Does the hysteresis apply to both input and enable pins?
Yes. All inputs-including OEA, OEB, and data pins (DAx/OAx)-feature 150mV hysteresis. This ensures noise immunity on control signals like chip enables or reset lines, preventing metastability or unintended bus activation in electrically noisy industrial settings.
Is thermal derating required for continuous 24mA output current at +85°C?
No. The device's 1.0W absolute maximum power dissipation and 24mA rating are specified over the full –40°C to +85°C range. At TA = +85°C and VCC = 3.6V, total worst-case power (quiescent + dynamic) remains ≤0.85W with 8-bit toggling at 10MHz, well within safe thermal limits for QSOP-20.
PI74LPT244CQE 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
PI74LPT244CQE FAQ
1.How can I place an order for PI74LPT244CQE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74LPT244CQE 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 PI74LPT244CQE reliable?
The price and inventory of PI74LPT244CQE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74LPT244CQE is usually 5 days.
3.What payment methods are accepted for PI74LPT244CQE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74LPT244CQE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74LPT244CQE?
PI74LPT244CQE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74LPT244CQE 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 PI74LPT244CQE?
For technical support, including PI74LPT244CQE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74LPT244CQE requirements.
6.How does Aetrix verify that PI74LPT244CQE is sourced from the original manufacturer or authorized distributors?
All PI74LPT244CQE 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 PI74LPT244CQE meets industry standards.
7.What is the process for return or replacement of PI74LPT244CQE?
All PI74LPT244CQE units undergo pre-shipment inspection (PSI). If there is an issue with PI74LPT244CQE, 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 PI74LPT244CQE part is unused and in its original packaging.
Return procedure for PI74LPT244CQE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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