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Texas Instruments SN74LVTH273DBR
- Part No.:
- SN74LVTH273DBR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH273DBR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,957
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Product details
Overview
SN74LVTH273DBR from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with direct-clear input, designed for 3.3-V VCC operation while supporting 5-V TTL-level inputs and outputs. It features bus-hold circuitry on all data inputs, Ioff partial-power-down protection, and operates down to 2.7 V. It is used in mixed-voltage digital systems such as industrial control backplanes and legacy bus interface logic.
For engineers reviewing the SN74LVTH273DBR datasheet, SN74LVTH273DBR pinout, SN74LVTH273DBR application, or SN74LVTH273DBR equivalent, key selection criteria include its 20-pin SSOP package, 150-MHz maximum clock frequency, bus-hold functionality eliminating external resistors, and compatibility with both 3.3-V logic domains and 5-V signal environments.
Technical Context
This device implements eight independent D-type latches synchronized to the rising edge of CLK, with asynchronous active-low CLR controlling all Q outputs simultaneously. Each flip-flop accepts individual D inputs and drives corresponding Q outputs without internal feedback or enable gating.
It supports mixed-mode signaling via TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and rail-to-rail output swing (VOL ≤ 0.55 V at IOL = 64 mA, VOH ≥ 2.0 V at IOH = −32 mA), enabling interoperability between 3.3-V and 5-V subsystems without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery supply and brownout resilience in portable or industrial power rails. |
| Max Clock Frequency | 150 MHz - enables high-speed data capture in synchronous bus interfaces and state-machine control paths. |
| tsu / th | 2.3 ns setup / 0 ns hold - reduces timing margin requirements and simplifies PCB trace length matching. |
| Ioff | ±100 µA - prevents backflow current during partial power-down, protecting powered-down sections in modular systems. |
| Bus-Hold Current | ±750 µA max - actively maintains valid logic states on floating D inputs, removing need for external pullup/pulldown resistors. |
| Output Drive | 64 mA sink / 32 mA source - drives standard TTL loads directly, including multiple gate inputs or small LED indicators. |
| ESD Rating | 2000-V HBM - meets industrial-grade robustness requirements for handling and board-level reliability. |
Pinout & Package
SN74LVTH273DBR is housed in a 20-pin Small-Outline Shrink Plastic (SSOP) package (DB), 7.4 mm × 5.3 mm body size, 0.65 mm lead pitch, and 2.0 mm max height per JEDEC MO-150.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (D1–D8) | Asynchronous parallel data inputs with bus-hold; each independently latched on CLK↑. |
| 9 | Ground (GND) | Reference return path for all internal logic and output drivers. |
| 10, 11, 12, 13, 14, 15, 16, 17 | Q Outputs (Q1–Q8) | Registered complementary outputs; Qn reflects Dn sampled at previous CLK↑. |
| 18 | VCC | 3.3-V supply input; must be decoupled locally to suppress switching noise and ground bounce. |
| 19 | CLK | Positive-edge-triggered clock input; edge-sensitive only-level-insensitive to static D changes. |
| 20 | CLR | Active-low asynchronous clear; forces all Q outputs low regardless of CLK or D state. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | Accepts 5-V TTL inputs while operating from 3.3-V VCC, eliminating external level translators in hybrid logic systems. |
| Bus-hold circuitry | Eliminates need for external pullup/pulldown resistors on unused or unterminated D lines, reducing BOM count and layout area. |
| Ioff protection | Disables outputs during power-down, preventing damaging current flow when VCC = 0 but I/O pins remain biased. |
| Low ground bounce (VOLP) | <0.8 V typical at VCC = 3.3 V - minimizes noise coupling into adjacent signals and improves signal integrity in dense layouts. |
| Latch-up immunity | >500 mA per JESD 17 - ensures robust operation under transient overvoltage or ESD stress in harsh environments. |
Applications
| Industrial Backplane Interface | Legacy Bus Data Latching |
|---|---|
Use Scenario: Interfacing 5-V ISA or PCI legacy peripherals to modern 3.3-V microcontroller-based controllers. IC Role / Device Role / Timing Role: Synchronizes and isolates bidirectional data transfers using edge-triggered registration and level-tolerant I/O. Use Value: Enables drop-in replacement of older 74ACT/74ALS devices without redesigning voltage translation or termination networks. |
Use Scenario: Capturing address/data strobes in FPGA-based protocol bridges where timing margins are tight. IC Role / Device Role / Timing Role: Provides deterministic, single-cycle registration of parallel bus signals with minimal skew across all 8 bits. Use Value: Reduces setup/hold timing violations by guaranteeing 2.3 ns setup and zero hold time, easing PCB routing constraints. |
| Modular PLC I/O Expansion | Test Equipment Signal Conditioning |
Use Scenario: Isolating and buffering digital I/O modules in programmable logic controllers with mixed-voltage fieldbus interfaces. IC Role / Device Role / Timing Role: Acts as a voltage-level-agile latch bank for status reporting and command distribution across isolated power domains. Use Value: Supports safe hot-swap operation via Ioff, preventing backfeed during module insertion/removal under partial power. |
Use Scenario: Stabilizing floating digital inputs in automated test equipment (ATE) fixture interfaces. IC Role / Device Role / Timing Role: Holds open-circuit or high-impedance sensor outputs at valid logic levels during measurement cycles. Use Value: Removes false triggering caused by noise or leakage on unterminated lines, improving test repeatability and pass/fail accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC273PW | No bus-hold; requires external pull resistors; lower drive (24 mA); VCC-only I/O tolerance (no 5-V input support). | Suitable only in fully 3.3-V systems with controlled I/O termination; not interoperable with 5-V buses. | Select when cost and power are prioritized over mixed-voltage flexibility and board-level simplicity. |
| 74ALVC273MTCX | Higher speed (200 MHz fmax); no Ioff; no bus-hold; 3.3-V-only I/O; different pinout (TSSOP-20 but non-identical mapping). | Requires PCB redesign; lacks power-down safety and floating-input robustness needed in modular hardware. | Choose only if higher clock rate is mandatory and system-level design allows full revalidation. |
Compared with SN74LVTH273DBR, SN74LVC273PW sacrifices mixed-voltage interface and bus-hold for lower static current, while 74ALVC273MTCX trades Ioff and pin compatibility for raw speed-neither offers the same combination of 5-V input tolerance, floating-input immunity, and safe power-down behavior.
Availability
SN74LVTH273DBR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy bus interface designs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for SN74LVTH273DBR 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 experience in industrial-grade interface ICs and broad portfolio support.
The SN74LVTH273DBR belongs to TI's LVTH logic family, engineered specifically for mixed-signal interoperability between 3.3-V and 5-V systems in demanding industrial and communications infrastructure applications.
FAQ
What is the operating voltage range for SN74LVTH273DBR?
The SN74LVTH273DBR operates from 2.7 V to 3.6 V on VCC. Its inputs tolerate up to 5.5 V, enabling direct connection to 5-V TTL sources without level-shifting circuitry. This dual-voltage capability is intrinsic to the LVTH family architecture and confirmed in the recommended operating conditions table of the SCBS136M datasheet.
Does SN74LVTH273DBR require external pullup resistors on its data inputs?
No. SN74LVTH273DBR integrates bus-hold circuitry on all eight D inputs, actively maintaining valid logic states when inputs are floating or unterminated. The datasheet explicitly states that use of external pullup/pulldown resistors with bus-hold is not recommended, as it may interfere with the internal clamping action.
Can SN74LVTH273DBR be used in partial-power-down systems?
Yes. SN74LVTH273DBR includes Ioff circuitry that disables outputs when VCC = 0, limiting current to ±100 µA and preventing damaging backflow from live I/O lines into a powered-down device. This feature is fully characterized and specified in the electrical characteristics table of the official datasheet.
What is the maximum clock frequency supported by SN74LVTH273DBR?
SN74LVTH273DBR supports a maximum clock frequency of 150 MHz at VCC = 3.3 V ± 0.3 V, as verified in the timing requirements section of the SCBS136M datasheet. This value is guaranteed across the full operating temperature range (−40°C to +85°C) and applies to all eight flip-flops simultaneously.
Is SN74LVTH273DBR pin-compatible with other packages in the same family?
SN74LVTH273DBR uses the 20-pin SSOP (DB) package with standardized pinout per TI's logic family conventions. It shares identical pin functions and ordering with SN74LVTH273DW (SOIC), SN74LVTH273NSR (SOP), and SN74LVTH273PWR (TSSOP), though mechanical dimensions and thermal characteristics differ. Pin mapping is consistent across all variants.
SN74LVTH273DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 150 MHz
- Max Propagation Delay @ V, Max CL:
- 4.9ns @ 3.3V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Current - Quiescent (Iq):
- 190 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LVTH273DBR FAQ
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Please submit a Request for Quotation (RFQ) for SN74LVTH273DBR 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 SN74LVTH273DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH273DBR is usually 5 days.
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Once your SN74LVTH273DBR 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 SN74LVTH273DBR?
For technical support, including SN74LVTH273DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH273DBR requirements.
6.How does Aetrix verify that SN74LVTH273DBR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH273DBR 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 SN74LVTH273DBR meets industry standards.
7.What is the process for return or replacement of SN74LVTH273DBR?
All SN74LVTH273DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH273DBR, 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 SN74LVTH273DBR part is unused and in its original packaging.
Return procedure for SN74LVTH273DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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