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Diodes Incorporated 74LVCH244AQ20-13
- Part No.:
- 74LVCH244AQ20-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74LVCH244AQ20-13.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 20DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
74LVCH244AQ20-13 from Diodes Incorporated is an octal non-inverting buffer/line driver with bus-hold and 3-state outputs in a 20-pin V-QFN4525 package. It operates from 1.65V to 3.6V, supports 5.5V-tolerant inputs, delivers ±24mA drive at 3.0V, and features IOFF for partial power-down protection-used in mixed-voltage bus interfacing on notebook and peripheral PCBs.
For engineers reviewing the 74LVCH244AQ20-13 datasheet, 74LVCH244AQ20-13 pinout, 74LVCH244AQ20-13 application, or 74LVCH244AQ20-13 equivalent, key selection criteria include 3.3V-compatible output drive strength, bus-hold input retention without external resistors, IOFF-enabled isolation during power sequencing, and thermal performance in space-constrained QFN layouts.
Technical Context
This device implements two independent 4-bit non-inverting buffers, each controlled by a dedicated OE input (Pin 1 and Pin 19), enabling selective 3-state output control per group. Bus-hold circuitry actively maintains logic state on un-driven inputs using internal feedback, eliminating need for external pull resistors.
IOFF functionality disables output drivers when VCC = 0V, blocking reverse current flow from live buses into powered-down sections. Schmitt-trigger inputs provide noise immunity across the full 1.65–3.6V supply range, while 5.5V input tolerance allows direct interfacing with legacy 5V logic without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65V to 3.6V - Enables operation across 1.8V, 2.5V, and 3.3V system rails with guaranteed timing and drive. |
| Output Drive Strength | ±24mA at VCC = 3.0V - Sustains robust signal integrity driving 50Ω transmission lines or multiple CMOS loads. |
| Input Voltage Tolerance | Up to 5.5V - Permits direct connection to 5V peripherals without external level translation circuitry. |
| Propagation Delay | 3.9ns typical at VCC = 3.3V - Supports >100MHz data rates in high-speed address/data bus applications. |
| IOFF Leakage Current | ±10μA max at VI/VO = 0V or 5.5V - Prevents backfeed current during partial power-down, protecting downstream ICs. |
| Bus-Hold Input Current | ±75μA at VCC = 3.0V - Actively retains logic state on floating inputs, reducing board-level noise susceptibility. |
| ESD Protection | 2kV HBM, 1kV CDM, 200V MM - Meets industrial-grade ESD robustness requirements without external protection diodes. |
Pinout & Package
V-QFN4525-20 package: 2.5mm × 4.5mm × 0.95mm body, 0.50mm lead pitch, exposed thermal pad (Pin 20 = VCC, Pin 10 = GND). JEDEC-compliant footprint per AP02001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low enable inputs controlling Y-group outputs; high = high-impedance state, low = pass-through mode. |
| 2, 4, 6, 8, 11, 13, 15, 17 | A1–A4, B1–B4 | Eight buffered data inputs (two groups of four); accept 5.5V-tolerant logic signals regardless of VCC. |
| 3, 5, 7, 9, 12, 14, 16, 18 | Y1–Y4, Z1–Z4 | Eight 3-state outputs with bus-hold; driven low/high when OE active, high-Z otherwise. |
| 10 | GND | Ground reference for all I/O and internal circuitry; must be connected to system ground plane. |
| 20 | VCC | Primary power supply input (1.65–3.6V); powers internal logic, drivers, and bus-hold circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-Hold Inputs | Maintains stable logic state on unused or unterminated inputs without external pull-up/down resistors-reducing BOM count and layout area. |
| IOFF Partial Power-Down | Disables output drivers and blocks reverse current flow when VCC = 0V-enabling safe hot-swap and multi-rail power sequencing. |
| Schmitt-Trigger Inputs | Provides hysteresis (typ. 0.3V) on all inputs-rejecting noise on slow-rising/falling signals in noisy industrial environments. |
| 5.5V-Tolerant Inputs | Accepts 5V logic levels while operating at 1.8V/2.5V/3.3V VCC-eliminating need for discrete level translators in mixed-voltage systems. |
| Low Dynamic Ground Bounce | VOLP < 0.8V at VCC = 3.3V-minimizes switching noise coupling into shared ground planes in dense digital PCBs. |
Applications
| PC & Notebook Memory Expansion | Hard Disk Drive Interface Buffering |
|---|---|
|
Use Scenario: Isolating and driving DDR address/control lines between SoC and memory modules in ultrabooks. IC Role / Device Role / Timing Role: Non-inverting buffer with bus-hold retaining valid states during memory power-down sequences. Use Value: Eliminates need for external pull resistors on address lines, reduces PCB layer count, and ensures deterministic startup behavior after sleep/resume cycles. |
Use Scenario: Level-shifting and buffering SATA/IDE control signals between 3.3V host controller and 5V drive electronics. IC Role / Device Role / Timing Role: 5.5V-tolerant input buffer enabling direct interface without discrete translators; IOFF prevents backfeed during drive spin-down. Use Value: Reduces component count by 3+ parts per interface, lowers signal propagation delay vs. resistor-based solutions, and improves ESD robustness on external connectors. |
| Set-Top Box HDMI CEC Bus Isolation | Industrial PLC I/O Module Signal Conditioning |
|
Use Scenario: Driving CEC (Consumer Electronics Control) bus signals across multiple HDMI-connected devices in TV ecosystems. IC Role / Device Role / Timing Role: 3-state driver enabling bidirectional arbitration on shared open-drain bus; bus-hold maintains last-known state during idle periods. Use Value: Guarantees reliable bus recovery after cable disconnection/reconnection without firmware intervention or external biasing. |
Use Scenario: Buffering isolated digital I/O signals between microcontroller and field-side optocouplers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-noise-immunity buffer with Schmitt-trigger inputs rejecting EMI from motor drives and solenoids. Use Value: Increases system uptime by preventing false triggering on long I/O traces, reduces need for external RC filtering, and simplifies EMC compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Same logic function but TSSOP-20 package (6.5mm × 6.4mm); no bus-hold; IOFF not specified. | Lacks bus-hold and IOFF-requires external pull resistors and cannot safely isolate powered-down subsystems. | Select when board space permits larger TSSOP and bus-hold/IOFF are not required for system architecture. |
| 74LVC244ABQX | Nexperia QFN20 variant; includes bus-hold but no IOFF; slightly higher ICC (15μA typ vs. 10μA). | Supports bus-hold but lacks IOFF-unsuitable for partial power-down scenarios where reverse current must be blocked. | Choose only if IOFF is not needed and Nexperia's qualification profile aligns with end-equipment requirements. |
Compared with SN74LVC244APWR and 74LVC244ABQX, the 74LVCH244AQ20-13 uniquely combines bus-hold, IOFF, and 5.5V-tolerant inputs in a compact 2.5×4.5mm QFN-making it optimal for space-constrained, multi-rail embedded systems requiring robust power sequencing and noise immunity.
Availability
74LVCH244AQ20-13 is available at Aetrix Electronics and suitable for notebook motherboard design, HDD interface conditioning, and set-top box CEC bus management requiring stable component supply and RoHS-compliant packaging.
Supply support for 74LVCH244AQ20-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, low-power, and mixed-signal solutions for computing, consumer, and industrial markets.
The 74LVCH244A belongs to Diodes' LVC logic family-designed specifically for low-voltage, high-speed bus interfacing in portable and energy-sensitive applications with strict thermal and footprint constraints.
FAQ
Does the 74LVCH244AQ20-13 require external pull-up or pull-down resistors on its inputs?
No. The integrated bus-hold circuitry actively maintains the last valid logic state on un-driven inputs, eliminating the need for external resistors. This reduces BOM cost, saves PCB area, and avoids potential signal integrity issues caused by resistor parasitics or mismatched values.
Can the 74LVCH244AQ20-13 safely interface between a 3.3V microcontroller and a 5V peripheral?
Yes. Its inputs tolerate up to 5.5V regardless of VCC voltage (1.65–3.6V), allowing direct connection to 5V outputs without level shifters. Outputs swing rail-to-rail within the VCC range, so a 3.3V-powered device drives 3.3V-compatible peripherals directly.
What is the thermal performance advantage of the QFN package over TSSOP for this device?
The V-QFN4525-20 package has θJA = 67°C/W versus 74°C/W for TSSOP-20 under identical 4-layer board conditions. This 10% lower junction-to-ambient resistance enables higher sustained drive current or operation in thermally constrained enclosures without derating.
How does IOFF protect the system during partial power-down sequences?
When VCC drops to 0V, IOFF disables the output drivers and increases output impedance beyond 10⁹Ω, preventing current from flowing backward from live 5V or 3.3V buses into the unpowered IC. This avoids latch-up risk and protects upstream drivers from damage or unpredictable behavior.
74LVCH244AQ20-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74LVCH
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- V-QFN4525-20
74LVCH244AQ20-13 FAQ
1.How can I place an order for 74LVCH244AQ20-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVCH244AQ20-13 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 74LVCH244AQ20-13 reliable?
The price and inventory of 74LVCH244AQ20-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVCH244AQ20-13 is usually 5 days.
3.What payment methods are accepted for 74LVCH244AQ20-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVCH244AQ20-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVCH244AQ20-13?
74LVCH244AQ20-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVCH244AQ20-13 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 74LVCH244AQ20-13?
For technical support, including 74LVCH244AQ20-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVCH244AQ20-13 requirements.
6.How does Aetrix verify that 74LVCH244AQ20-13 is sourced from the original manufacturer or authorized distributors?
All 74LVCH244AQ20-13 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 74LVCH244AQ20-13 meets industry standards.
7.What is the process for return or replacement of 74LVCH244AQ20-13?
All 74LVCH244AQ20-13 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVCH244AQ20-13, 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 74LVCH244AQ20-13 part is unused and in its original packaging.
Return procedure for 74LVCH244AQ20-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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