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Texas Instruments SN74LVCZ244ANSR
- Part No.:
- SN74LVCZ244ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVCZ244ANSR.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,667
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Product details
Overview
SN74LVCZ244ANSR 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, accepts 5.5V-tolerant inputs, delivers ≤5.9ns propagation delay at 3.3V, and supports mixed-mode signaling (5V I/O with 3.3V VCC) in server memory bus interface applications.
For engineers reviewing the SN74LVCZ244ANSR datasheet, SN74LVCZ244ANSR pinout, SN74LVCZ244ANSR application, or SN74LVCZ244ANSR equivalent, key selection criteria include 3-state drive capability, Ioff-enabled live insertion, ground bounce (VOLP < 0.8V) and undershoot (VOHV > 2V) performance, and thermal metrics for TSSOP-20 packaging.
Technical Context
The SN74LVCZ244ANSR implements dual-bank CMOS buffer logic (xYn = xAn), where each bank's four outputs are simultaneously enabled or disabled via its respective OE pin. Its balanced 3-state outputs provide matched sourcing/sinking capability up to ±24mA at 3V, enabling robust driving of light- to medium-capacitive loads on PCB traces up to 12cm.
It integrates partial-power-down protection (Ioff) that disables all outputs when VCC = 0V, preventing back-drive current and supporting hot-plug operation. Input clamping diodes (negative only) and JESD78 Class II latch-up immunity (>100mA) ensure reliability in noisy or mixed-voltage system environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V–3.6V - Enables direct integration into 3.3V systems without level-shifting. |
| Input Voltage Range | 0V–5.5V - Supports 5V-tolerant inputs for seamless interfacing with legacy or mixed-voltage buses. |
| Max Propagation Delay | 5.9ns at 3.3V - Ensures timing-critical signal integrity in high-speed memory and data-path buffering. |
| Output Drive Strength | ±24mA at 3V - Sustains clean edge rates into typical PCB trace loads without external termination. |
| VOLP / VOHV | <0.8V / >2V at 3.3V - Limits ground bounce and output undershoot to maintain noise margin in dense layouts. |
| Ioff Current | ±5μA max - Prevents damaging back-drive current during partial power-down or live insertion. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and extended-temperature embedded computing environments. |
Pinout & Package
SN74LVCZ244ANSR is supplied in a 20-pin TSSOP package (PW), measuring 6.5mm × 6.4mm (including pins) with a 6.5mm × 4.4mm body size. The package features a standard 0.65mm pitch and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19OE | Bank 1 & 2 Output Enable (active low) | Independent control of two 4-bit buffers; pulling high places corresponding outputs in high-impedance state. |
| 1A1–1A4, 2A1–2A4 | Input channels (8 total) | Non-inverting inputs mapped one-to-one to outputs; tolerant to 5.5V regardless of VCC. |
| 1Y1–1Y4, 2Y1–2Y4 | Output channels (8 total) | 3-state CMOS outputs with balanced drive; high-impedance when OE is high. |
| 10 GND, 20 VCC | Power supply terminals | Dual power/ground pair minimizes switching noise; requires local 0.1μF bypass capacitor per VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode I/O support | 5V input/output voltage compatibility with 3.3V VCC enables direct connection to 5V peripherals without external translators. |
| Ioff partial-power-down | Prevents current flow between powered and unpowered sections, allowing safe live insertion in modular backplane systems. |
| Balanced CMOS 3-state outputs | Matched sourcing/sinking ensures consistent rise/fall times and reduces signal asymmetry on shared buses. |
| Low ground bounce (VOLP) | <0.8V at 3.3V suppresses simultaneous switching noise that could corrupt adjacent digital signals. |
| JESD78 Class II latch-up immunity | Exceeds 100mA - guarantees robustness against transient overcurrent events in high-density server boards. |
Applications
| Server Memory Bus Interface | Network Switch Data Path Buffering |
|---|---|
Use Scenario: Driving address/data lines between CPU and DDR4 memory modules in 1U rack servers. IC Role / Device Role / Timing Role: Octal 3-state buffer isolating memory controller outputs; dual OE pins allow staggered bank enable for reduced peak current. Use Value: 5.9ns tpd and 5.5V-tolerant inputs eliminate need for discrete level shifters while maintaining JEDEC timing margins. | Use Scenario: Isolating and strengthening control signals between switch fabric ASIC and management microcontroller. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent bank control for configuration register access and status reporting. Use Value: Ioff protection prevents back-drive damage during hot-swap of management daughterboards. |
| Industrial PC Expansion Slot Interface | Embedded Storage Controller Signal Conditioning |
Use Scenario: Buffering PCIe configuration space reads/writes across a mezzanine connector in ruggedized IPCs. IC Role / Device Role / Timing Role: Low-skew octal driver translating between 3.3V host logic and 5V peripheral logic on expansion bus. Use Value: Mixed-mode operation eliminates external voltage translators, reducing BOM count and layout area. | Use Scenario: Driving SATA LED indicators and reset signals from SoC GPIOs to front-panel connectors in NAS enclosures. IC Role / Device Role / Timing Role: High-drive 3-state buffer ensuring reliable LED turn-on and clean reset assertion under varying load conditions. Use Value: ±24mA output drive sustains full brightness across long ribbon cables without added drivers. |
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 |
|---|---|---|---|
| SN74LVC244APWR | No Z-series enhanced noise suppression; higher VOLP (1.2V typical) and lower VOHV (1.5V typical). | Lacks optimized ground bounce/undershoot performance for ultra-dense routing. | Select when cost sensitivity outweighs signal integrity requirements in non-critical paths. |
| 74LVC244ADTR2G | Same electrical specs but in SOIC-20 package; no thermal pad; RθJA = 77.9°C/W vs. 120.3°C/W for TSSOP. | Lower thermal resistance suits higher ambient temperature or continuous drive scenarios. | Choose for legacy board compatibility or improved thermal dissipation in fixed-layout designs. |
Compared with SN74LVC244APWR, SN74LVCZ244ANSR provides superior noise immunity for high-speed bus interfaces; compared with 74LVC244ADTR2G, it offers smaller footprint and better high-frequency EMI control, though with higher junction-to-ambient thermal resistance.
Availability
SN74LVCZ244ANSR is available at Aetrix Electronics and suitable for server memory subsystems, network switch data paths, industrial PC expansion interfaces, embedded storage controllers, and high-reliability backplane interconnects requiring stable component supply across extended temperature ranges.
Supply support for SN74LVCZ244ANSR 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The SN74LVCZ244ANSR belongs to TI's LVCZ logic family, engineered specifically for high-speed, low-noise 3-state buffering in mixed-voltage computing infrastructure where signal integrity and live-insertion safety are critical.
FAQ
What is the maximum operating temperature range for the SN74LVCZ244ANSR?
The SN74LVCZ244ANSR is rated for operation from –40°C to +125°C. This extended temperature range is validated per TI's Recommended Operating Conditions and supports deployment in industrial-grade server motherboards, network equipment, and embedded controllers exposed to elevated ambient temperatures.
Does the SN74LVCZ244ANSR support 5V inputs while powered at 3.3V?
Yes, the SN74LVCZ244ANSR supports input voltages up to 5.5V regardless of VCC level (2.7V–3.6V). This mixed-mode capability allows direct interfacing with 5V peripherals without external level shifters, and is explicitly confirmed in the Recommended Operating Conditions table of the official datasheet.
What is the purpose of the Ioff feature in the SN74LVCZ244ANSR?
The Ioff feature in the SN74LVCZ244ANSR disables all outputs when VCC = 0V, preventing back-drive current from live-inserted boards into unpowered sections. This protects downstream circuitry and enables safe hot-plug operation in modular systems such as blade servers and telecom line cards.
Can the SN74LVCZ244ANSR be used as a drop-in replacement for SN74LVC244A devices?
No - the SN74LVCZ244ANSR is not a drop-in replacement for standard SN74LVC244A variants. While pin-compatible, it features enhanced noise-suppression characteristics (lower VOLP, higher VOHV) and tighter switching specifications. System validation is required before substitution, particularly in timing-critical or EMI-sensitive designs.
What bypass capacitor value is recommended for the SN74LVCZ244ANSR?
A 0.1μF ceramic capacitor is recommended per VCC pin of the SN74LVCZ244ANSR, placed as close as possible to the pin with a low-inductance ground return path. TI's layout guidelines also permit paralleling with a 1μF capacitor to improve broadband noise suppression across switching frequencies.
SN74LVCZ244ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCZ
- Package/Case:
- 20-SOIC (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-SO
SN74LVCZ244ANSR FAQ
1.How can I place an order for SN74LVCZ244ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCZ244ANSR 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 SN74LVCZ244ANSR reliable?
The price and inventory of SN74LVCZ244ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCZ244ANSR is usually 5 days.
3.What payment methods are accepted for SN74LVCZ244ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVCZ244ANSR transactions.
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4.How is shipping managed for SN74LVCZ244ANSR?
SN74LVCZ244ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCZ244ANSR 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 SN74LVCZ244ANSR?
For technical support, including SN74LVCZ244ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCZ244ANSR requirements.
6.How does Aetrix verify that SN74LVCZ244ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LVCZ244ANSR 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 SN74LVCZ244ANSR meets industry standards.
7.What is the process for return or replacement of SN74LVCZ244ANSR?
All SN74LVCZ244ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCZ244ANSR, 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 SN74LVCZ244ANSR part is unused and in its original packaging.
Return procedure for SN74LVCZ244ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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