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Texas Instruments SN74LVTH273NS
- Part No.:
- SN74LVTH273NS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74LVTH273NS.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:10,920
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Product details
Overview
SN74LVTH273NS from Fairchild Semiconductor is a low-voltage, positive-edge-triggered octal D-type flip-flop with asynchronous clear, designed for 3.3V VCC operation while interfacing to 5V TTL systems. It features bushold inputs (eliminating external pull-ups), ±32mA/64mA output drive, and operates across –40°C to +85°C in industrial control logic and data latching applications.
For engineers reviewing the SN74LVTH273NS datasheet, SN74LVTH273NS pinout, SN74LVTH273NS application, or SN74LVTH273NS equivalent, key selection criteria include its 150MHz max clock frequency, 2.3ns setup time, bushold input capability, and 20-pin SOIC (NS) package compatibility with legacy 74-series timing and storage functions.
Technical Context
The SN74LVTH273NS implements eight independent D-type latches sharing a common buffered clock (CP) and active-low asynchronous clear (CLR). Each flip-flop captures the state of its Dn input on the LOW-to-HIGH transition of CP, provided setup (2.3ns) and hold (0ns) timing requirements are met.
Its BiCMOS process enables high-speed operation (tPLH/tPHL ≤ 5.5ns) with low power consumption (ICCL = 5mA typical), while bushold circuitry maintains valid logic levels on unconnected D inputs without external biasing - critical for robustness in partial-configuration digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V–3.6V - Ensures stable operation in 3.3V systems with ±0.3V tolerance |
| Max Clock Frequency | 150MHz - Supports high-throughput data capture in synchronous logic chains |
| Output Drive | –32mA (HIGH), +64mA (LOW) - Drives heavy capacitive loads or multiple TTL inputs directly |
| Setup Time (tS) | 2.3ns - Enables tight timing margins in fast clock domains |
| Propagation Delay | tPLH/tPHL ≤ 5.5ns - Minimizes latency between clock edge and output update |
| Bushold Current | ±75µA at 3.0V - Maintains valid logic state on floating inputs without external components |
| Operating Temp | –40°C to +85°C - Qualified for industrial ambient environments |
Pinout & Package
SN74LVTH273NS is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (package code NS), with standard 1.27mm lead pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Data Inputs | Individual asynchronous data sources for each of eight flip-flops |
| CP | Clock Pulse Input | Positive-edge-triggered global clock controlling all eight latches simultaneously |
| CLR | Asynchronous Clear | Active-low signal forcing all Q outputs LOW regardless of clock state |
| O0–O7 | Outputs | Registered outputs reflecting D-input states sampled at prior CP rising edge |
| VCC, GND | Power Supply | Single 3.3V supply with dedicated power/ground pins for noise isolation |
Key Features
| Feature | Design Value |
|---|---|
| Bushold Inputs | Eliminates need for external pull-up resistors on unused D inputs, reducing BOM count and board space |
| 5V-TTL Interface Capability | Accepts 5V logic inputs while operating at 3.3V VCC, enabling mixed-voltage system interconnect |
| High-Drive Outputs | –32mA/64mA drive supports fan-out to ≥10 LVTTL loads or direct connection to legacy 5V TTL inputs |
| Low-Power BiCMOS Process | Delivers ABT-class speed (150MHz) with sub-5mA quiescent current in LOW-output state |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Latching parallel sensor data from 8-bit analog input modules before serial transmission to a controller. IC Role / Device Role / Timing Role: Octal D flip-flop providing synchronized, glitch-free registration of real-time analog channel readings. Use Value: Bushold inputs prevent floating states during module hot-swap; 150MHz clock margin ensures timing compliance even with PCB trace skew. | Use Scenario: Bridging a modern 3.3V microcontroller to an older 5V ISA bus data latch interface. IC Role / Device Role / Timing Role: Level-translating data register that accepts 5V address/data signals and presents clean 3.3V-compatible outputs. Use Value: Native 5V-tolerant inputs eliminate discrete level shifters; ±32mA/64mA drive ensures reliable signaling into bus capacitance. |
| Test Equipment Pattern Generator | Programmable Logic Control Sequencer |
Use Scenario: Holding fixed test vectors in automated boundary-scan or functional test fixtures. IC Role / Device Role / Timing Role: Static pattern storage element triggered by precision clock edges for repeatable stimulus generation. Use Value: 2.3ns setup time allows tight synchronization with high-frequency pattern clocks; CLR enables deterministic reset between test cycles. | Use Scenario: Storing machine-state bits in a stepper motor controller where outputs drive discrete power stages. IC Role / Device Role / Timing Role: Synchronized state-holding register feeding combinational logic for motion sequencing. Use Value: Asynchronous CLR provides immediate emergency stop response; 64mA sink capability drives opto-isolator LEDs directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with clear applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC273PW | No bushold; lower drive (–24mA/+24mA); 1.65V–3.6V VCC | Lacks input hold capability; requires external pull-ups on unused pins | Preferred when cost sensitivity outweighs bushold benefit and load drive is ≤24mA |
| 74ALVC273MTCX | Higher speed (tPD ≤ 3.5ns); no bushold; 1.65V–3.6V VCC | Optimized for minimal propagation delay but lacks input retention | Select when maximum timing performance is required and all inputs are actively driven |
Compared with SN74LVTH273NS, SN74LVC273PW offers wider voltage range but sacrifices bushold and output strength, while 74ALVC273MTCX improves speed at the cost of input robustness - making SN74LVTH273NS uniquely suited for partial-configuration, mixed-voltage, and high-drive industrial latching.
Availability
SN74LVTH273NS is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, and test equipment pattern generators requiring stable component supply, long-term lifecycle support, and guaranteed SOIC-20 packaging consistency.
Supply support for SN74LVTH273NS 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The LVTH family was engineered for 3.3V systems needing seamless interoperability with 5V TTL buses, combining high-speed BiCMOS performance with robust input handling and industrial temperature resilience - precisely embodied by SN74LVTH273NS.
FAQ
What is the maximum clock frequency supported by SN74LVTH273NS?
The SN74LVTH273NS supports a maximum clock frequency of 150MHz under recommended operating conditions (VCC = 3.3V, TA = –40°C to +85°C, CL = 50pF). This rating is guaranteed across temperature and voltage ranges and reflects the device's ability to reliably capture data on every rising clock edge without metastability or timing violation.
Does SN74LVTH273NS require external pull-up resistors on unused D inputs?
No, SN74LVTH273NS does not require external pull-up resistors on unused D inputs due to integrated bushold circuitry. This feature actively maintains the last valid logic state on each D input, preventing floating nodes and eliminating risk of undefined outputs - a key reliability advantage in modular or field-configurable systems where inputs may be left unconnected.
What package type is used for SN74LVTH273NS?
SN74LVTH273NS uses a 20-pin Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide, with package code NS. Its dimensions, lead pitch (1.27mm), and gull-wing lead form are fully compatible with standard SOIC-20 footprints and automated assembly processes.
Can SN74LVTH273NS interface directly with 5V logic systems?
Yes, SN74LVTH273NS can interface directly with 5V logic systems: its inputs tolerate up to 5.5V DC, allowing connection to 5V TTL outputs without level-shifting circuitry, while its 3.3V VCC supply and bushold-enabled inputs make it ideal for bridging voltage domains in mixed-signal industrial controllers.
What is the purpose of the CLR pin on SN74LVTH273NS?
The CLR (Clear) pin on SN74LVTH273NS is an active-low asynchronous reset that forces all eight Q outputs LOW immediately upon assertion, independent of the clock signal. This enables deterministic initialization, emergency shutdown, or state clearing in safety-critical or time-sensitive control sequences without waiting for the next clock edge.
SN74LVTH273NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVTH273NS FAQ
1.How can I place an order for SN74LVTH273NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH273NS 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 SN74LVTH273NS reliable?
The price and inventory of SN74LVTH273NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH273NS is usually 5 days.
3.What payment methods are accepted for SN74LVTH273NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH273NS transactions.
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4.How is shipping managed for SN74LVTH273NS?
SN74LVTH273NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH273NS 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 SN74LVTH273NS?
For technical support, including SN74LVTH273NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH273NS requirements.
6.How does Aetrix verify that SN74LVTH273NS is sourced from the original manufacturer or authorized distributors?
All SN74LVTH273NS 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 SN74LVTH273NS meets industry standards.
7.What is the process for return or replacement of SN74LVTH273NS?
All SN74LVTH273NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH273NS, 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 SN74LVTH273NS part is unused and in its original packaging.
Return procedure for SN74LVTH273NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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