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Texas Instruments SN74LVCH244ADB
- Part No.:
- SN74LVCH244ADB
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVCH244ADB.pdf
- Description:
- BUS DRIVER, LVC/LCX/Z SERIES
- Quantity:
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Inventory:10,290
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Product details
Overview
SN74LVCH244ADB from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V VCC operation. It features bus-hold circuitry on all data inputs, Ioff partial-power-down support, and mixed-mode signal operation-accepting 5.5-V inputs while powered at 3.3 V or lower. It is used in bidirectional data buffering between 3.3-V microcontrollers and 5-V legacy peripherals.
For engineers reviewing the SN74LVCH244ADB datasheet, SN74LVCH244ADB pinout, SN74LVCH244ADB application, or SN74LVCH244ADB equivalent, key selection criteria include its 20-pin SSOP (DB) package, 5.9-ns max propagation delay at 3.3 V, ±24-mA output drive capability, bus-hold input retention, and Ioff-enabled power-down isolation.
Technical Context
This device implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable (OE) control. Each section passes A→Y when OE is low; outputs enter high-impedance state when OE is high. Bus-hold circuitry actively maintains valid logic levels on undriven inputs without external resistors.
The SN74LVCH244ADB supports mixed-voltage interfacing: inputs tolerate up to 5.5 V regardless of VCC, enabling direct connection to 5-V TTL outputs while operating from 1.65–3.6 V supplies. Its Ioff specification ensures no backflow current during partial power-down, critical for hot-swap and power-gating systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables compatibility with 1.8-V, 2.5-V, and 3.3-V logic domains. |
| Max tpd | 5.9 ns at VCC = 3.3 V - Supports high-speed data transfer in memory interfaces and FPGA I/O expansion. |
| IOL/IOH | ±24 mA at VCC = 3.0 V - Drives heavy capacitive loads or multiple CMOS inputs without external buffers. |
| Input Voltage Tolerance | 0 V to 5.5 V - Allows direct interfacing with 5-V logic families without level-shifting components. |
| Bus-Hold Current | ±75 µA at VCC = 3.0 V - Eliminates need for external pullup/pulldown resistors on unused data lines. |
| Ioff | ±10 µA at VCC = 0 V - Prevents damaging back-current during system power sequencing or partial shutdown. |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade robustness requirements for board-level handling. |
Pinout & Package
SN74LVCH244ADB uses a 20-pin SSOP (Shrink Small-Outline Package), JEDEC MO-150 compliant, with 0.65-mm lead pitch and body dimensions 7.5 mm × 5.3 mm × 1.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs (active-low) | Independent enable for Group 1 (pins 1A1–1A4 → 1Y1–1Y4) and Group 2 (2A1–2A4 → 2Y1–2Y4). |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight buffered inputs with bus-hold; accept 0–5.5 V regardless of VCC. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Noninverting outputs capable of sinking/sourcing ±24 mA; high-Z when respective OE is high. |
| VCC (Pin 20) | Power supply | Single supply rail for entire device; range 1.65–3.6 V. |
| GND (Pin 10) | Ground reference | Common return path for all I/O and internal circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | 5-V-tolerant inputs enable seamless interface between 3.3-V SoCs and legacy 5-V peripherals without external translators. |
| Active bus-hold circuitry | Eliminates external pullup/pulldown resistors on floating data lines, reducing BOM count and PCB area. |
| Ioff partial-power-down protection | Prevents current backflow when VCC is off or ramping, supporting safe hot-plug and power-gated subsystems. |
| Low dynamic ground bounce | VOLP < 0.8 V at VCC = 3.3 V ensures stable noise margins in high-speed switching environments. |
| High ESD immunity | 2000-V HBM rating meets IPC/JEDEC JESD22-A114 reliability standards for industrial assembly and field use. |
Applications
| Industrial PLC I/O Expansion | Embedded Microcontroller Bus Buffering |
|---|---|
|
Use Scenario: Isolating and driving 8-bit parallel data between a 3.3-V ARM Cortex-M microcontroller and legacy 5-V digital I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing voltage-level translation, fanout amplification, and controlled bus release via OE signals. Use Value: Eliminates discrete level shifters and pull resistors while maintaining timing integrity (5.9 ns tpd) across temperature (-40°C to +85°C). |
Use Scenario: Expanding GPIO count on a space-constrained embedded design by buffering address/data lines between MCU and external SRAM or FPGA configuration memory. IC Role / Device Role / Timing Role: Octal driver with bus-hold ensuring stable inputs during reset or low-power modes; OE enables dynamic bus sharing. Use Value: Reduces risk of floating inputs causing spurious reads/writes; ±24-mA drive sustains signal integrity over 10-cm PCB traces. |
| Automotive Body Control Module Interface | Test Equipment Digital Pattern Generator |
|
Use Scenario: Interfacing a 3.3-V automotive MCU to 5-V sensor signal conditioners and actuator drivers in body control units. IC Role / Device Role / Timing Role: Voltage-tolerant buffer enabling interoperability across mixed-supply domains while meeting AEC-Q100 stress requirements (via SN74LVCH244A-Q1 variant lineage). Use Value: Simplifies compliance with ISO 11898-3 EMC requirements due to low ground bounce and controlled edge rates. |
Use Scenario: Driving multiple DUT inputs simultaneously from a pattern generator's limited-drive FPGA I/O bank in automated test equipment. IC Role / Device Role / Timing Role: Fanout buffer with precise 5.9-ns propagation delay matching and tight skew control across all eight channels. Use Value: Enables deterministic timing alignment across parallel test vectors; 3-state outputs allow shared bus reconfiguration without hardware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APW | No bus-hold circuitry; identical VCC range and pinout but requires external pull resistors on unused inputs. | Suitable where input states are always driven; not recommended for systems with intermittent or floating buses. | Choose SN74LVC244APW only if cost sensitivity outweighs design simplicity and floating-input risk. |
| 74ALVC244MTCX | Higher speed (tpd = 3.3 ns @ 3.3 V), same 20-pin TSSOP package, but lacks Ioff and bus-hold features. | Better for ultra-low-latency paths but requires additional power sequencing safeguards and external biasing. | Select 74ALVC244MTCX only when sub-4-ns delay is mandatory and system-level power management is fully controlled. |
Compared with SN74LVC244APW and 74ALVC244MTCX, the SN74LVCH244ADB uniquely combines bus-hold, Ioff, and 5-V-tolerant inputs in a single 20-pin SSOP device-reducing component count, improving robustness against floating nodes, and simplifying power-down sequencing in mixed-voltage systems.
Availability
SN74LVCH244ADB is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded microcontroller bus buffering, and automotive body control module interface requiring stable component supply and long-term lifecycle support.
Supply support for SN74LVCH244ADB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability interface ICs.
The SN74LVCH244ADB belongs to TI's LVC/LVCH logic family, engineered for low-voltage, mixed-signal interfacing in industrial, automotive, and communications systems where voltage translation, power sequencing, and noise immunity are critical.
FAQ
What is the maximum input voltage the SN74LVCH244ADB can tolerate?
The SN74LVCH244ADB accepts input voltages from 0 V to 5.5 V on all A-input pins, regardless of VCC level. This allows direct connection to 5-V logic sources while operating from as low as 1.65 V, making SN74LVCH244ADB ideal for mixed-voltage system interfacing without external level shifters.
Does the SN74LVCH244ADB require external pullup or pulldown resistors on its inputs?
No. The SN74LVCH244ADB integrates active bus-hold circuitry on all eight data inputs, which maintains valid logic states on undriven or floating inputs. Using external resistors with SN74LVCH244ADB is not recommended and may interfere with bus-hold functionality.
Can the SN74LVCH244ADB be used in partial-power-down applications?
Yes. The SN74LVCH244ADB includes Ioff circuitry that disables outputs and limits leakage to ±10 µA when VCC = 0 V, preventing damaging current backflow. This makes SN74LVCH244ADB suitable for hot-swap, power-gated subsystems, and systems with staggered supply sequencing.
What is the propagation delay of the SN74LVCH244ADB at 3.3 V?
At VCC = 3.3 V and TA = 25°C, the SN74LVCH244ADB has a maximum propagation delay (tpd) of 5.9 ns from A-input to Y-output. This value is guaranteed across the full operating temperature range (-40°C to +85°C) and supports high-speed parallel data transfer in real-time control systems.
Is the SN74LVCH244ADB pin-compatible with other packages in the LVCH244A family?
Yes. The SN74LVCH244ADB shares identical pinout and function with all 20-pin variants of the SN74LVCH244A family-including DBQ, DW, NS, PW, DGV, and RGY packages. Signal assignments (e.g., 1OE, 1A1–1A4, 1Y1–1Y4, GND, VCC) are consistent across these packages, enabling drop-in substitution based on board layout and thermal requirements.
SN74LVCH244ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVCH244ADB FAQ
1.How can I place an order for SN74LVCH244ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH244ADB 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 SN74LVCH244ADB reliable?
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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 SN74LVCH244ADB?
For technical support, including SN74LVCH244ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH244ADB requirements.
6.How does Aetrix verify that SN74LVCH244ADB is sourced from the original manufacturer or authorized distributors?
All SN74LVCH244ADB 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 SN74LVCH244ADB meets industry standards.
7.What is the process for return or replacement of SN74LVCH244ADB?
All SN74LVCH244ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH244ADB, 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 SN74LVCH244ADB part is unused and in its original packaging.
Return procedure for SN74LVCH244ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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