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onsemi DM74ALS273N
- Part No.:
- DM74ALS273N
- Manufacturer:
- onsemi
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
DM74ALS273N.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,662
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Product details
Overview
DM74ALS273N from Fairchild Semiconductor is an octal D-type edge-triggered flip-flop with asynchronous clear, implemented in advanced oxide-isolated, ion-implanted Schottky TTL. It operates at 5 V, supports up to 35 MHz clock frequency, features 24 mA low-level output drive, and is packaged in a 20-lead PDIP (JEDEC MS-001). It is used in synchronous data latching and register applications within industrial control logic systems.
For engineers reviewing the DM74ALS273N datasheet, pinout, applications, or equivalent options, key selection considerations include positive-edge clock triggering, guaranteed switching over 0°C to +70°C, direct clear functionality, buffer-type outputs, and compatibility with legacy DM74LS273-based designs.
Technical Context
This device implements eight independent D-type flip-flops sharing a common clock and asynchronous clear input. Each stage transfers D-input data to Q-output on the positive edge of CLK, with setup time ≥10 ns and hold time ≥0 ns at VCC = 4.5–5.5 V.
It uses Schottky-clamped TTL circuitry for improved speed and noise immunity versus standard LS logic. The direct clear input forces all Q outputs LOW independently of clock state, and outputs are fully buffered to drive 50 pF loads with specified tPLH/tPHL propagation delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard TTL supply tolerances. |
| fCLK Max | 35 MHz - Supports high-speed synchronous data capture in register files and pipeline stages. |
| IOL | 24 mA - Drives multiple TTL inputs or moderate capacitive loads without external buffers. |
| tSU / tH | 10 ns / 0 ns - Enables tight timing margins in fast clock domains with minimal data setup overhead. |
| Propagation Delay | tPLH ≤12 ns, tPHL ≤18 ns - Guarantees predictable timing behavior under load (RL = 500 Ω, CL = 50 pF). |
| Operating Temp | 0°C to +70°C - Qualified for commercial-grade industrial control and instrumentation environments. |
Pinout & Package
DM74ALS273N is housed in a 20-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 inch wide, with through-hole mounting and standard 0.1-inch pin spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLR) | Asynchronous Clear Input | Active-LOW global reset: forces all eight Q outputs LOW regardless of clock state. |
| 2–9 (D1–D8) | Data Inputs | Eight independent D inputs; each latches its value on next positive clock edge if CLR is HIGH. |
| 10 (GND) | Ground Reference | Common return path for all internal logic and output drivers. |
| 11–18 (Q1–Q8) | True Outputs | Eight buffered, non-inverted outputs reflecting latched D-input states. |
| 19 (CLK) | Clock Input | Positive-edge-triggered master clock; sampling occurs only at rising transition. |
| 20 (VCC) | Power Supply | +5 V DC supply; decoupling capacitor required near pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered operation | Positive-clock-edge sampling ensures deterministic data capture synchronized to system clock edges. |
| Direct asynchronous clear | Single-pin global reset enables immediate register initialization without clock dependency. |
| Buffered outputs | High-drive capability (24 mA sink) and controlled rise/fall times reduce signal integrity risks in bus-loaded systems. |
| Pin-for-pin compatibility | Direct replacement for DM74LS273 in existing layouts, enabling performance upgrade without PCB revision. |
Applications
| Industrial PLC Register File | Digital Test Equipment Control |
|---|---|
Use Scenario: Storing I/O status bits and control word registers in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Octal latch providing synchronized, noise-immune storage of parallel control signals with global reset. Use Value: Enables deterministic scan-cycle updates at up to 35 MHz while maintaining compatibility with legacy LS-based firmware and layout. | Use Scenario: Capturing stimulus pattern data and configuring test vector sequencing in automated test equipment. IC Role / Device Role / Timing Role: Edge-triggered data register synchronizing test command words to system clock domain. Use Value: Provides reliable setup/hold timing (10 ns/0 ns) and 24 mA drive to interface directly with multiple TTL-level comparators and drivers. |
| Legacy System Data Bus Interface | Microprocessor Address Latch |
Use Scenario: Interfacing between microcontroller data buses and peripheral memory-mapped devices in retro-computing or embedded instrumentation. IC Role / Device Role / Timing Role: Synchronizing bidirectional data transfers using clocked D-flip-flop behavior with active-low clear for bus initialization. Use Value: Delivers guaranteed 35 MHz operation and buffered outputs to meet strict timing windows in 8-bit CPU bus cycles. | Use Scenario: Latching upper address bytes during multiplexed address/data bus cycles in 8085/8080-based systems. IC Role / Device Role / Timing Role: Positive-edge triggered address register holding A8–A15 during AD0–AD7 demultiplexing. Use Value: Meets critical setup time (10 ns) and provides robust 24 mA sink current to drive address decoder inputs reliably. |
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 | Identical electrical specs and pinout; manufactured by Texas Instruments under same ALS family spec. | No functional difference; validated in identical industrial control and test equipment roles. | Select when TI-sourced supply chain alignment or dual-sourcing strategy is required. |
| DM74LS273N | Slower max clock (30 MHz), lower output drive (8 mA), higher power consumption (ICC ≈ 24 mA vs. 19–29 mA). | Suitable for lower-speed legacy upgrades where timing margin is relaxed and power budget allows. | Choose only if cost sensitivity outweighs speed/power advantages of ALS variant. |
Compared with SN74ALS273N and DM74LS273N, the DM74ALS273N delivers superior speed (35 MHz vs. 30 MHz), stronger output drive (24 mA vs. 8 mA), and lower dynamic power-making it optimal for timing-critical register file and bus interface designs requiring drop-in ALS performance.
Availability
DM74ALS273N is available at Aetrix Electronics and suitable for industrial PLC register files, digital test equipment control logic, and legacy microprocessor address latching requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS273N 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 leading designer and manufacturer of analog and mixed-signal semiconductors, acquired by ON Semiconductor in 2016. Its legacy TTL and ALS logic families remain widely deployed in industrial and instrumentation systems.
The DM74ALS273N belongs to Fairchild's advanced Schottky TTL (ALS) logic product line, engineered for higher speed and lower power than standard LS logic while maintaining full compatibility with existing TTL infrastructure.
FAQ
What is the maximum clock frequency supported by the DM74ALS273N?
The DM74ALS273N supports a maximum clock frequency of 35 MHz across its recommended operating range (VCC = 4.5 V to 5.5 V, TA = 0°C to +70°C). This specification is guaranteed in the switching characteristics table and verified under 50 pF load conditions. The DM74ALS273N achieves this speed via its oxide-isolated, ion-implanted Schottky TTL process, distinguishing it from slower LS variants.
Does the DM74ALS273N have a synchronous or asynchronous clear function?
The DM74ALS273N features an asynchronous clear (CLR) input, active LOW. When asserted, it forces all eight Q outputs LOW immediately-regardless of clock state or timing. This behavior is confirmed in the function table and logic diagram. The DM74ALS273N does not require a clock edge to execute clear, making it suitable for immediate system initialization.
Is the DM74ALS273N pin-compatible with the DM74LS273N?
Yes, the DM74ALS273N is functionally and pin-for-pin compatible with the DM74LS273N, as explicitly stated in the datasheet features section. Both share identical pin assignments, logic behavior, and package options-including the N20A PDIP. This allows direct substitution in existing LS-based designs to improve speed and drive strength without layout changes.
What are the output drive capabilities of the DM74ALS273N?
The DM74ALS273N provides 24 mA low-level output current (IOL) and −2.6 mA high-level output current (IOH) at VCC = 4.5 V. These values are specified in the Electrical Characteristics table and enable direct interfacing with multiple TTL inputs or moderate capacitive loads. The DM74ALS273N's buffered outputs maintain signal integrity better than standard LS counterparts.
What temperature range is the DM74ALS273N rated for?
The DM74ALS273N is rated for operation from 0°C to +70°C (free-air temperature), per the Recommended Operating Conditions table. Its electrical specifications-including propagation delay, setup/hold time, and output drive-are guaranteed across this full commercial temperature range. The DM74ALS273N is not qualified for extended industrial (−40°C to +85°C) or automotive use.
DM74ALS273N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
DM74ALS273N FAQ
1.How can I place an order for DM74ALS273N through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS273N 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 DM74ALS273N reliable?
The price and inventory of DM74ALS273N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS273N is usually 5 days.
3.What payment methods are accepted for DM74ALS273N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS273N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS273N?
DM74ALS273N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS273N 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 DM74ALS273N?
For technical support, including DM74ALS273N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS273N requirements.
6.How does Aetrix verify that DM74ALS273N is sourced from the original manufacturer or authorized distributors?
All DM74ALS273N 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 DM74ALS273N meets industry standards.
7.What is the process for return or replacement of DM74ALS273N?
All DM74ALS273N units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS273N, 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 DM74ALS273N part is unused and in its original packaging.
Return procedure for DM74ALS273N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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