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Texas Instruments SN74ALS273DWRG4
- Part No.:
- SN74ALS273DWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS273DWRG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,193
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Product details
Overview
SN74ALS273DWRG4 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, operating at 5 V with 35 MHz max clock frequency and ±24 mA output drive. It is used in synchronous digital systems for data latching, register storage, and pattern generation.
For engineers reviewing the SN74ALS273DWRG4 datasheet, SN74ALS273DWRG4 pinout, SN74ALS273DWRG4 application, or SN74ALS273DWRG4 equivalent, this device serves as a legacy-compatible, high-speed, single-rail storage element in industrial control logic, test equipment registers, and legacy bus interface designs requiring TTL-level timing and drive strength.
Technical Context
This device implements eight identical D-type flip-flops sharing one clock and one asynchronous clear signal. Each flip-flop transfers its D-input to the Q-output on the positive-going edge of CLK, provided setup (10 ns) and hold (0 ns) timing requirements are met. The CLR input forces all Q outputs low asynchronously, independent of CLK state.
It uses bipolar ALS (Advanced Low-Power Schottky) TTL technology, delivering 24 mA sink current and 2.6 mA source current at VCC = 5 V, with propagation delays as low as 2 ns (tPLH) and 3 ns (tPHL) under loaded conditions. Its operation is specified over 0°C to 70°C and requires 4.5 V–5.5 V supply voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS TTL - enables interoperability with legacy 74-series TTL systems and provides higher speed than standard LS. |
| Max Clock Frequency | 35 MHz - supports high-speed synchronous data capture in register files and shift register chains. |
| Output Drive | 24 mA sink / 2.6 mA source - sufficient to directly drive multiple TTL inputs or small LED indicators without buffering. |
| Propagation Delay | 2–15 ns (CLK→Q) - ensures tight timing margins in pipeline stages and state-machine control paths. |
| Supply Voltage Range | 4.5 V–5.5 V - compatible with standard 5 V regulated power rails and tolerant of typical board-level ripple. |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial ambient environments, not extended or automotive grade. |
| Setup Time | 10 ns - defines minimum D-input stability window before CLK edge; critical for reliable latch timing in synchronous designs. |
Pinout & Package
SN74ALS273DWRG4 is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, with 1.27 mm pitch and 2.65 mm max height. Pin 1 is marked by a beveled corner or notch; the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear - forces all eight Q outputs low regardless of CLK state; must be pulled high via 4.7 kΩ for normal operation. |
| 2–9 | 1D–8D | Eight independent data inputs - each controls the corresponding flip-flop's next-state value on CLK edge. |
| 10 | GND | Ground reference - connects to system 0 V plane; decoupling capacitor (0.1 µF) required adjacent to pin. |
| 11–18 | 1Q–8Q | Eight non-inverted registered outputs - reflect stored D values after CLK edge; capable of driving up to 20 TTL loads. |
| 19 | CLK | Buffered positive-edge clock - triggers simultaneous latching across all eight flip-flops; edge-sensitive, not level-sensitive. |
| 20 | VCC | +5 V supply - must be filtered and stabilized; ICCL = 29 mA max ensures adequate rail capacity for full-output switching. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type architecture | Enables compact 8-bit register implementation in a single 20-pin package, reducing PCB footprint vs. discrete flip-flop solutions. |
| Direct-clear (CLR) input | Allows system-wide reset of all stored bits without requiring sequential clocking or external logic, simplifying initialization sequences. |
| Buffered clock and clear | Reduces fan-out loading on upstream drivers and improves noise immunity on critical control signals in noisy industrial environments. |
| Single-rail TTL outputs | Eliminates need for pull-up resistors or level translators when interfacing with other 5 V TTL or CMOS inputs (74HC/HCT). |
| ALS process technology | Delivers 2× speed and 50% lower power than standard LS TTL, enabling faster throughput in legacy-compatible logic designs. |
Applications
| Industrial Control Registers | Test Equipment Pattern Generators |
|---|---|
Use Scenario: Storing I/O configuration bits and status flags in programmable logic controllers (PLCs) with fixed 5 V backplane power. IC Role / Device Role / Timing Role: Acts as an 8-bit parallel-load register holding control word states synchronized to system clock edges. Use Value: Provides deterministic, glitch-free bit storage with guaranteed 10 ns setup margin-critical for safe I/O state transitions in safety-critical loops. |
Use Scenario: Generating repeatable stimulus waveforms for automated test fixtures validating digital ASICs and FPGAs. IC Role / Device Role / Timing Role: Serves as a programmable pattern register clocked by test sequencer, feeding parallel data to DUT input pins. Use Value: Delivers 35 MHz update rate and 24 mA drive per output-enabling direct connection to DUT inputs without additional buffers or level-shifting. |
| Legacy Bus Interface Latches | LED Display Row Drivers |
Use Scenario: Capturing address/data bus contents during memory-mapped peripheral access in 8-bit microcontroller systems (e.g., Z80, 8085). IC Role / Device Role / Timing Role: Functions as a transparent latch for bus arbitration, isolating transient bus activity from downstream logic. Use Value: ALS TTL compatibility ensures seamless integration with vintage bus timing budgets and eliminates level-conversion overhead. |
Use Scenario: Driving 8-segment common-anode LED displays in instrumentation panels where microcontroller GPIO is limited. IC Role / Device Role / Timing Role: Acts as a static output latch, holding display row data while column scanning occurs. Use Value: 24 mA sink capability allows direct driving of standard LEDs at full brightness without external transistors or current-limiting resistors per segment. |
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 |
|---|---|---|---|
| SN74ALS273N | Same ALS TTL core, but in 20-pin PDIP (N) package; no tape-and-reel, larger footprint, through-hole mounting. | Suitable for prototyping, repair, or legacy through-hole PCBs; lacks MSL-1 reflow compatibility and automated placement support. | Select SN74ALS273N only if manual assembly or socket-based design is required; SN74ALS273DWRG4 preferred for SMT production. |
| SN74LS273N | LS TTL version - slower (30 MHz max), higher power (ICCL = 42 mA), and lower output drive (8 mA sink) than ALS variant. | Acceptable in low-speed, cost-sensitive legacy systems where timing margin is relaxed and power dissipation is less constrained. | Choose SN74LS273N only when backward compatibility with existing LS-based schematics is mandatory; SN74ALS273DWRG4 offers superior speed/power trade-off. |
Compared with SN74ALS273N and SN74LS273N, SN74ALS273DWRG4 delivers the highest clock frequency and lowest power-delay product in the 273 family while supporting modern SMT assembly-making it optimal for volume-manufactured industrial electronics requiring legacy TTL interoperability.
Availability
SN74ALS273DWRG4 is available at Aetrix Electronics and suitable for industrial control registers, test equipment pattern generators, legacy bus interface latches, and LED display row drivers requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS273DWRG4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.
SN74ALS273DWRG4 belongs to TI's legacy 74ALS logic family, designed specifically to extend the performance of TTL-based digital systems with improved speed-power efficiency while maintaining pin and functional compatibility with earlier 74-series devices.
FAQ
What is the maximum clock frequency supported by SN74ALS273DWRG4?
The SN74ALS273DWRG4 supports a maximum clock frequency of 35 MHz under recommended operating conditions (VCC = 4.5 V–5.5 V, CL = 50 pF, TA = 0°C to 70°C). This specification is verified in the official Texas Instruments SDAS218A datasheet, Table 4, and reflects the highest guaranteed toggle rate for reliable edge-triggered operation across all eight flip-flops simultaneously.
Does SN74ALS273DWRG4 have 3-state outputs?
No, SN74ALS273DWRG4 does not feature 3-state outputs. It provides standard totem-pole TTL outputs with active-high and active-low drive capability (24 mA sink, 2.6 mA source). The device lacks output-enable (OE) control, so outputs remain continuously driven-making it unsuitable for bus-sharing applications without external isolation logic.
What is the function of the CLR pin on SN74ALS273DWRG4?
The CLR (pin 1) on SN74ALS273DWRG4 is an asynchronous active-low clear input that forces all eight Q outputs low immediately, regardless of CLK state or timing. When held high (≥2 V), the flip-flops operate normally; when pulled low (≤0.8 V), Q outputs go low within 24 ns (tPHL), overriding any pending clock event. This enables system-wide reset without clock dependency.
Can SN74ALS273DWRG4 operate at 3.3 V?
No, SN74ALS273DWRG4 is not rated for 3.3 V operation. Its absolute maximum VCC is 7 V, but the recommended operating range is strictly 4.5 V–5.5 V. At 3.3 V, the ALS TTL circuitry fails to meet VIH/VIL thresholds, resulting in undefined logic states, increased propagation delay, and potential metastability. Use 74LVC or 74AUP series for 3.3 V–compatible octal D-flip-flops.
What package type is SN74ALS273DWRG4 supplied in?
SN74ALS273DWRG4 is supplied in a 20-pin SOIC (DW) package, measuring 7.5 mm × 12.8 mm with 1.27 mm lead pitch and 2.65 mm max height. It is RoHS-compliant, features NiPdAu lead finish, and carries MSL Level-1 (unlimited floor life), making it suitable for standard reflow soldering processes without dry-pack requirements.
SN74ALS273DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 35 MHz
- Max Propagation Delay @ V, Max CL:
- 15ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 20 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS273DWRG4 FAQ
1.How can I place an order for SN74ALS273DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS273DWRG4 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 SN74ALS273DWRG4 reliable?
The price and inventory of SN74ALS273DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS273DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74ALS273DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS273DWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS273DWRG4?
SN74ALS273DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS273DWRG4 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 SN74ALS273DWRG4?
For technical support, including SN74ALS273DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS273DWRG4 requirements.
6.How does Aetrix verify that SN74ALS273DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS273DWRG4 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 SN74ALS273DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74ALS273DWRG4?
All SN74ALS273DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS273DWRG4, 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 SN74ALS273DWRG4 part is unused and in its original packaging.
Return procedure for SN74ALS273DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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