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Texas Instruments SN74LVCZ244ADBR
- Part No.:
- SN74LVCZ244ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVCZ244ADBR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,301
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Product details
Overview
SN74LVCZ244ADBR from Texas Instruments is an octal 3-state buffer/driver IC configured as two independent 4-bit banks, each controlled by a dedicated active-low output enable pin. It operates from 2.7V to 3.6V, supports 5.5V-tolerant inputs, delivers ≤5.9ns propagation delay at 3.3V, and enables mixed-mode interfacing (e.g., 5V signals with 3.3V VCC) in high-speed memory and bus interface applications.
For engineers reviewing the SN74LVCZ244ADBR datasheet, SN74LVCZ244ADBR pinout, SN74LVCZ244ADBR application, or SN74LVCZ244ADBR equivalent, this page provides verified functional roles, bank-level 3-state control behavior, overvoltage-tolerant input capability, thermal metrics for SSOP-20, and real-world signal integrity guidance for trace lengths >12 cm.
Technical Context
The SN74LVCZ244ADBR implements two electrically isolated 4-bit buffer banks (Bank 1: A1–A4 → Y1–Y4; Bank 2: B1–B4 → Y1–Y4), each with independent active-low OE control (OE1, OE2). Its balanced CMOS 3-state outputs drive high, low, or enter high-impedance-enabling bidirectional bus sharing without contention.
It features Ioff protection for live insertion and partial power-down, standard CMOS inputs with ≤3.5pF capacitance, and clamp diodes on all I/O pins for ESD robustness (2500V HBM, 4000V CDM). The device maintains valid logic levels across –40°C to 125°C with guaranteed VOL ≤0.55V and VOH ≥2.2V at 24mA drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Enables direct integration into 3.3V systems without level-shifting. |
| Input Voltage Tolerance | Up to 5.5V - Allows safe interfacing with 5V logic sources while powered at 3.3V. |
| Max Propagation Delay | 5.9ns at VCC = 3.3V - Supports >100MHz bus operation with tight timing margins. |
| Output Drive Strength | ±24mA at VCC = 3V - Sustains signal integrity over PCB traces up to 12 cm without external termination. |
| Ioff Current | ±5μA at VI/VO = 5.5V - Prevents back-driving and leakage during hot-swap or power sequencing. |
| Operating Temperature | –40°C to 125°C - Qualified for industrial and networking equipment with extended thermal range. |
| ESD Rating | 2500V HBM, 4000V CDM - Meets JEDEC standards for robust handling in automated assembly. |
Pinout & Package
SN74LVCZ244ADBR uses the SSOP-20 (DB) package: 7.2mm × 7.8mm body size, 20-pin surface-mount with gull-wing leads. Thermal resistance RθJA = 97.7°C/W enables reliable operation at full drive under industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19OE | Active-low bank enable inputs | Independent control of Bank 1 (pins 2,3,4,5 → 18,17,16,15) and Bank 2 (pins 12,13,14,15 → 8,9,10,11); both must be low for output drive. |
| 1A1–1A4, 2A1–2A4 | Input terminals (8 total) | CMOS-compatible inputs tolerant to 5.5V; no external pull-ups required when driven. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state output terminals (8 total) | Drive high/low or float to high-Z; output impedance >100kΩ in disabled state per Electrical Characteristics. |
| VCC (Pin 20), GND (Pin 10) | Power supply connections | Requires local 0.1μF bypass capacitor placed adjacent to Pin 20 and connected to Pin 10 with minimal trace length. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5V-tolerant inputs allow connection to legacy 5V buses while VCC = 3.3V, eliminating external level shifters. |
| Ioff partial-power-down protection | Outputs remain high-impedance and draw <5μA even if VCC = 0V, enabling safe hot-plug in modular systems. |
| Balanced CMOS 3-state outputs | Symmetric ±24mA drive ensures matched rise/fall times and reduces ground bounce (<0.8V typical VOLP). |
| Low propagation delay | 5.9ns max at 3.3V enables use in DDR memory data paths and high-speed peripheral interfaces. |
| Latch-up immunity | Exceeds 100mA per JESD78 Class II - prevents destructive latch-up during transient overvoltage events. |
Applications
| Memory Bus Interface | Network Switch Backplane |
|---|---|
Use Scenario: Driving address/data lines between a 3.3V FPGA and 5V SRAM modules in embedded computing systems. IC Role / Device Role / Timing Role: Octal buffer isolates voltage domains and provides 24mA drive to meet setup/hold timing across 10 cm PCB traces. Use Value: Eliminates need for discrete level translators while maintaining <5.9ns tpd for synchronous access cycles. |
Use Scenario: Buffering control signals between line cards and switch fabric ASICs operating at different supply voltages. IC Role / Device Role / Timing Role: Dual-bank 3-state architecture allows dynamic bus arbitration without contention during card insertion/removal. Use Value: Ioff protection ensures zero back-drive current during hot-swap, preventing system reset or data corruption. |
| Server DIMM Slot Interface | Industrial PC Expansion Bus |
Use Scenario: Isolating SMBus or SPD signals between motherboard and DDR4/DDR5 memory modules. IC Role / Device Role / Timing Role: Low-capacitance inputs (3.5pF) and outputs (5.5pF) minimize signal degradation on multi-drop I²C buses. Use Value: Guaranteed VOL ≤0.4V at 12mA ensures noise margin compliance across temperature and voltage corners. |
Use Scenario: Interfacing ISA or LPC bus peripherals (e.g., Super I/O chips) to modern 3.3V host controllers. IC Role / Device Role / Timing Role: Two independent OE pins enable selective enabling of legacy vs. new peripheral groups on shared address/data lines. Use Value: 125°C rating supports operation in sealed industrial enclosures without forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APW | TSSOP-20 package (6.5mm × 6.4mm); RθJA = 120.3°C/W - higher thermal resistance than DB package. | Same electrical specs but lower power dissipation margin in high-density layouts; requires tighter layout control for thermal management. | Prefer SN74LVCZ244ADBR for space-constrained boards needing better thermal performance; choose PW only if footprint compatibility with existing TSSOP designs is required. |
| 74LVC244ADB | Same SSOP-20 package and pinout, but lacks Z-series features: no 5.5V input tolerance, max tpd = 6.7ns at 3.3V, no Ioff. | Not suitable for mixed-voltage systems or hot-swap applications; limited to single-supply 3.3V environments. | Select SN74LVCZ244ADBR when interfacing with 5V peripherals or requiring live insertion support; avoid 74LVC244ADB in new designs with voltage translation needs. |
Compared with SN74LVC244APW and 74LVC244ADB, the SN74LVCZ244ADBR uniquely combines 5.5V input tolerance, Ioff protection, and SSOP-20 thermal performance-making it the only option qualified for industrial hot-swap and mixed-voltage bus buffering without external components.
Availability
SN74LVCZ244ADBR is available at Aetrix Electronics and suitable for server backplanes, network switch control planes, and industrial PC expansion buses requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74LVCZ244ADBR 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 SN74LVCZ244ADBR belongs to TI's LVCZ advanced logic family, designed specifically for robust voltage-translating buffer applications in networking, computing, and industrial infrastructure where mixed-supply interoperability and hot-swap resilience are critical.
FAQ
What is the maximum input voltage the SN74LVCZ244ADBR can tolerate?
The SN74LVCZ244ADBR accepts input voltages up to 5.5V regardless of VCC level, enabling direct connection to 5V logic sources while operating from a 3.3V supply. This overvoltage tolerance is specified in the Recommended Operating Conditions table and validated across –40°C to 125°C, making SN74LVCZ244ADBR suitable for mixed-voltage system interfacing without external level shifters.
Does the SN74LVCZ244ADBR support hot-swap or live insertion?
Yes, the SN74LVCZ244ADBR supports live insertion via its Ioff feature: when VCC = 0V, all outputs enter high-impedance and draw less than ±5μA, preventing back-driving of powered circuitry. This behavior is tested per JESD78 Class II and documented in the Electrical Characteristics table, confirming safe operation during hot-plug events in modular server or telecom chassis.
What is the propagation delay of the SN74LVCZ244ADBR at 3.3V?
The maximum propagation delay (tpd) of the SN74LVCZ244ADBR is 5.9ns at VCC = 3.3V and TA = 25°C, as specified in the Switching Characteristics table. This value holds across –40°C to 85°C; at –40°C to 125°C, max tpd increases to 6.4ns. The low delay enables use in high-speed memory and peripheral interfaces where timing budgets are tight.
Can the SN74LVCZ244ADBR drive long PCB traces without signal integrity issues?
Yes-the SN74LVCZ244ADBR's ±24mA drive strength and balanced CMOS outputs support clean signal edges on traces up to 12 cm. Layout guidelines in the datasheet recommend source termination with a series damping resistor for longer traces, and the device's low output capacitance (5.5pF) minimizes loading effects. Simulated waveforms in Figure 8-2 confirm stable eye diagrams with Rd = 22Ω for 15 cm traces.
What package does the SN74LVCZ244ADBR use, and what are its thermal characteristics?
The SN74LVCZ244ADBR uses the SSOP-20 (DB) package with 7.2mm × 7.8mm body size. Its thermal resistance is RθJA = 97.7°C/W, RθJC = 59.4°C/W, and RθJB = 52.9°C/W. These values-listed in Section 5.4-are measured per JEDEC standards and enable reliable operation at full output drive in industrial ambient temperatures up to 85°C without forced airflow.
SN74LVCZ244ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCZ
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- 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:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LVCZ244ADBR FAQ
1.How can I place an order for SN74LVCZ244ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCZ244ADBR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74LVCZ244ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCZ244ADBR is usually 5 days.
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Once your SN74LVCZ244ADBR 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 SN74LVCZ244ADBR?
For technical support, including SN74LVCZ244ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCZ244ADBR requirements.
6.How does Aetrix verify that SN74LVCZ244ADBR is sourced from the original manufacturer or authorized distributors?
All SN74LVCZ244ADBR 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 SN74LVCZ244ADBR meets industry standards.
7.What is the process for return or replacement of SN74LVCZ244ADBR?
All SN74LVCZ244ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCZ244ADBR, 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 SN74LVCZ244ADBR part is unused and in its original packaging.
Return procedure for SN74LVCZ244ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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