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Texas Instruments SN74ALS273DB
- Part No.:
- SN74ALS273DB
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74ALS273DB.pdf
- Description:
- OCTAL D-TYPE POSITIVE-EDGE-TRIGG
- Quantity:
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Inventory:5,260
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Product details
Overview
SN74ALS273DB from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, implemented in ALS TTL logic. It features eight independent D inputs, a common buffered clock (CLK), and a shared direct-clear (CLR) input. Rated for 0°C to 70°C operation, it delivers 35 MHz maximum clock frequency, 12 mA low-level output drive, and 24 mA sink capability - suitable for synchronous data latching in industrial control registers and legacy bus interface circuits.
For engineers reviewing the SN74ALS273DB datasheet, SN74ALS273DB pinout, SN74ALS273DB application, or SN74ALS273DB equivalent, this device serves as a TTL-compatible edge-triggered storage element where deterministic setup/hold timing (10 ns tsu, 0 ns th), rail-to-rail single-ended outputs, and robust noise immunity are required in non-3-state register designs.
Technical Context
This device implements eight identical D-type flip-flops sharing one clock and one asynchronous clear line, with no output enable - all outputs are always active (non-tristate). Each flip-flop transfers its D-input value to Q on the positive-going edge of CLK, provided setup time (10 ns) is met and CLR remains high.
It uses bipolar ALS (Advanced Low-Power Schottky) TTL technology, delivering higher speed and lower power than standard LS TTL, with guaranteed VOH ≥ 2.4 V at IOL = 12 mA and VOL ≤ 0.4 V under same load - enabling reliable interfacing with other TTL and CMOS inputs across 4.5–5.5 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS TTL - enables interoperability with legacy 5 V TTL systems while reducing power vs. standard LS. |
| Clock Frequency | 35 MHz max - supports high-speed synchronous latching in data acquisition and address buffering. |
| Output Drive | 24 mA sink (IOL), –2.6 mA source (IOH) - drives multiple TTL loads without external buffers. |
| Setup/Hold Time | tsu = 10 ns, th = 0 ns - simplifies timing closure in fixed-frequency clock domains with minimal margining. |
| Supply Range | 4.5 V to 5.5 V - compatible with regulated 5 V rails; tolerates typical ±5% tolerance without derating. |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications. |
| Propagation Delay | tPLH/tPHL = 2–12 ns (CLK→Q) - ensures predictable, sub-15 ns output response for cycle-accurate sampling. |
Pinout & Package
SN74ALS273DB is packaged in a 20-pin SOIC (DW) body measuring 7.5 mm × 12.8 mm × 2.65 mm max height, with 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or dot; package complies with JEDEC MS-013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear - forces all Q outputs low regardless of CLK state; overrides D input. |
| 2–9 | 1D–8D | Independent data inputs - each controls corresponding flip-flop's next-state value on CLK edge. |
| 10 | GND | Ground reference - must be low-impedance connection to minimize switching noise coupling. |
| 11–18 | 1Q–8Q | Complementary Q outputs - non-inverting, totem-pole, rail-to-rail outputs with no 3-state capability. |
| 19 | CLK | Buffered positive-edge clock - triggers simultaneous transfer of all eight D inputs to Q outputs. |
| 20 | VCC | +5 V supply - requires local 0.1 µF ceramic decoupling adjacent to pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flops | Eight independent storage elements in one IC - reduces board space and interconnect count vs. discrete FFs. |
| Direct-clear (CLR) input | Asynchronous reset clears all outputs simultaneously - eliminates need for sequential software reset or external logic. |
| Buffered clock and clear | Internal buffering isolates inputs from capacitive loading - maintains timing integrity across full fanout. |
| ALS TTL process | 2x speed and ~50% lower power vs. LS TTL - extends thermal margin in dense logic arrays. |
| No output enable | Fixed-output architecture - simplifies control logic but requires external gating if bus sharing is needed. |
Applications
| Buffer/Storage Registers | Shift Registers |
|---|---|
|
Use Scenario: Holding parallel data from microcontroller ports or ADCs before serial transmission or processing. IC Role / Device Role / Timing Role: Synchronous latch capturing 8-bit parallel words on rising CLK edge with zero hold-time requirement. Use Value: Eliminates metastability risk during bus handoff and provides clean, jitter-free sampled data aligned to system clock. |
Use Scenario: Constructing 8-bit or cascaded shift registers for serial-to-parallel conversion in LED drivers or sensor interfaces. IC Role / Device Role / Timing Role: Edge-triggered stage in multi-chip shift chain; Q outputs feed D inputs of next stage via PCB trace. Use Value: Predictable 12 ns max propagation delay enables reliable 35 MHz shift rates without added timing margin. |
| Pattern Generators | Address Latching |
|
Use Scenario: Generating fixed test patterns (e.g., walking 1s, checkerboard) for digital circuit validation. IC Role / Device Role / Timing Role: State-holding element in combinational feedback loop; outputs fed back through gates to D inputs. Use Value: Guaranteed 10 ns setup time allows stable pattern cycling at 30+ MHz without external delay tuning. |
Use Scenario: Capturing microprocessor address bus values during memory-mapped I/O or peripheral access cycles. IC Role / Device Role / Timing Role: Address register holding upper/lower byte during multiplexed bus de-multiplexing (e.g., with 8080/8085). Use Value: Direct-clear enables fast address reset between transactions; 24 mA drive sustains signal integrity across long traces. |
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 |
|---|---|---|---|
| SN74LS273N | LS TTL family - 30 MHz max fCLK, higher ICC (29 mA ICCL), slower tPLH (15 ns typ) | Lower speed, higher power - acceptable where 35 MHz is not required and legacy LS compatibility is prioritized. | Choose SN74LS273N only if existing design uses LS-level drive/load specs and timing budget allows 5 MHz margin loss. |
| SN74HC273N | CMOS HC family - 5 V tolerant, 25 MHz max fCLK, rail-to-rail VOH/VOL, µA-level ICC | Lower power, wider VCC range (2–6 V), but incompatible TTL input thresholds and reduced noise margin at 5 V. | Choose SN74HC273N for battery-powered or mixed-voltage systems; avoid in pure 5 V TTL backplanes due to VIH/VIL mismatch. |
Compared with SN74ALS273DB, SN74LS273N trades speed and efficiency for broader legacy compatibility, while SN74HC273N offers ultra-low static power and voltage flexibility at the cost of TTL-level noise immunity and peak frequency - making SN74ALS273DB optimal for performance-critical 5 V TTL register applications.
Availability
SN74ALS273DB is available at Aetrix Electronics and suitable for industrial control systems, legacy instrumentation interfaces, and embedded data acquisition modules requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS273DB 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS273DB belongs to TI's legacy ALS TTL logic portfolio, designed specifically for high-reliability, medium-speed synchronous data storage in 5 V systems where compatibility with existing TTL infrastructure is essential.
FAQ
What is the maximum clock frequency supported by the SN74ALS273DB?
The SN74ALS273DB supports a maximum clock frequency of 35 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF, TA = 0°C to 70°C). This rating is verified per TI's SDAS218A datasheet and reflects guaranteed timing across temperature and voltage extremes - not a typical-only value. The SN74ALS273DB achieves this using ALS TTL process enhancements over standard LS.
Does the SN74ALS273DB have 3-state outputs?
No, the SN74ALS273DB does not feature 3-state outputs. All eight Q outputs are totem-pole, actively driven high or low at all times - there is no output-enable (OE) control. This means the SN74ALS273DB cannot share a common bus without external gating logic. Its design targets dedicated register or latch functions, not bus-oriented applications.
What are the absolute maximum ratings for SN74ALS273DB supply voltage and input voltage?
The absolute maximum supply voltage (VCC) for SN74ALS273DB is 7 V, and the absolute maximum input voltage (VI) is also 7 V - exceeding either risks permanent damage. These stress ratings are not operational limits; the device must be used within recommended conditions: VCC = 4.5 V to 5.5 V, with VIH ≥ 2 V and VIL ≤ 0.8 V. Operation beyond absolute maxima voids TI's warranty and may degrade reliability even if functional.
How does the SN74ALS273DB handle setup and hold timing requirements?
The SN74ALS273DB requires a minimum 10 ns setup time (tsu) for D inputs before the CLK rising edge and has zero hold time (th = 0 ns) - meaning D may change immediately after CLK transitions. This simplifies timing analysis in fixed-frequency systems. These values are guaranteed over full temperature and voltage ranges and are measured relative to the 1.3 V logic threshold, not signal edge crossing.
Is SN74ALS273DB pin-compatible with SN74LS273N?
Yes, SN74ALS273DB and SN74LS273N share identical 20-pin SOIC (DW) and PDIP (N) footprints, pin assignments, and functional block diagrams - including identical CLR, CLK, D, Q, VCC, and GND locations. However, SN74ALS273DB offers higher speed (35 MHz vs. 30 MHz) and lower power, so direct substitution is electrically valid but requires verification of timing margins in high-frequency designs.
SN74ALS273DB 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:
- -
SN74ALS273DB FAQ
1.How can I place an order for SN74ALS273DB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS273DB 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 SN74ALS273DB reliable?
The price and inventory of SN74ALS273DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS273DB is usually 5 days.
3.What payment methods are accepted for SN74ALS273DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS273DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS273DB?
SN74ALS273DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS273DB 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 SN74ALS273DB?
For technical support, including SN74ALS273DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS273DB requirements.
6.How does Aetrix verify that SN74ALS273DB is sourced from the original manufacturer or authorized distributors?
All SN74ALS273DB 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 SN74ALS273DB meets industry standards.
7.What is the process for return or replacement of SN74ALS273DB?
All SN74ALS273DB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS273DB, 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 SN74ALS273DB part is unused and in its original packaging.
Return procedure for SN74ALS273DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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