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onsemi DM74ALS74AN
- Part No.:
- DM74ALS74AN
- Manufacturer:
- onsemi
- Category:
- Flip Flops
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
DM74ALS74AN.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,119
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Product details
Overview
DM74ALS74AN from Fairchild Semiconductor is a dual D-type positive-edge-triggered flip-flop with asynchronous preset and clear, implemented in advanced oxide-isolated Schottky TTL. It operates at 5 V, supports up to 34 MHz clock frequency, features 14.5 ns minimum pulse width, and delivers ±8 mA output drive in a 14-lead PDIP package for synchronous logic control in industrial timing circuits.
For engineers reviewing the DM74ALS74AN datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed AC performance over 0°C to +70°C, functional compatibility with LS74 and Schottky TTL families, and verified 14-lead PDIP (N14A) mechanical footprint compliance.
Technical Context
This device implements two independent edge-triggered storage elements with fully asynchronous active-low preset and clear inputs. Each section accepts D data on the rising edge of CLK and produces complementary Q/Q̅ outputs with propagation delays as low as 3 ns (preset→Q) and 5 ns (CLK→Q).
It uses ion-implanted Schottky TTL process technology to achieve improved speed-power trade-off versus standard LS TTL-delivering ~2× faster switching than LS74 while consuming approximately half the supply current (ICC = 2.4–4 mA typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures robust operation across standard TTL power rail tolerances |
| fMAX | 34 MHz - supports high-speed synchronous state machines in digital controllers |
| tPLH / tPHL | 3–18 ns - enables precise timing alignment in multi-stage pipeline designs |
| IOL / IOH | 8 mA / −0.4 mA - drives standard TTL loads without external buffering |
| tW(CLK) | 14.5 ns minimum HIGH/LOW - defines minimum clock duty cycle for reliable edge capture |
| VIH / VIL | 2.0 V / 0.8 V - compatible with standard TTL input thresholds for seamless system integration |
Pinout & Package
DM74ALS74AN is housed in a 14-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide (Package Number N14A), with through-hole mounting and industry-standard lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1CLR | Asynchronous active-low clear for first flip-flop - forces Q1 = LOW regardless of clock or D |
| 2 | 1D | Data input for first flip-flop - sampled on rising CLK edge |
| 3 | 1CLK | Clock input for first flip-flop - triggers transfer only on positive edge |
| 4 | 1PR | Asynchronous active-low preset for first flip-flop - forces Q1 = HIGH |
| 5 | 1Q | True output of first flip-flop - reflects stored D value after clock edge |
| 6 | 1Q̅ | Inverted output of first flip-flop - complements Q1 state |
| 7 | GND | Ground reference - common return path for all internal logic and I/O |
| 8 | 2Q̅ | Inverted output of second flip-flop - complements Q2 state |
| 9 | 2Q | True output of second flip-flop - reflects stored D value after clock edge |
| 10 | 2PR | Asynchronous active-low preset for second flip-flop - forces Q2 = HIGH |
| 11 | 2CLK | Clock input for second flip-flop - triggers transfer only on positive edge |
| 12 | 2D | Data input for second flip-flop - sampled on rising CLK edge |
| 13 | 2CLR | Asynchronous active-low clear for second flip-flop - forces Q2 = LOW |
| 14 | VCC | +5 V supply - powers both flip-flops and internal logic circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Positive-edge triggering | Ensures deterministic state update only on rising clock transitions, eliminating metastability risk from level-sensitive sampling |
| Asynchronous preset/clear | Allows immediate initialization or reset of each flip-flop independent of clock timing, critical for power-up sequencing and fault recovery |
| Pin-for-pin compatibility with LS74 | Enables drop-in replacement in legacy TTL designs without PCB modification or layout rework |
| Guaranteed AC specs over full temp/VCC range | Validates timing margins across 0°C to +70°C and 4.5–5.5 V, reducing need for derating in industrial environments |
| Advanced Schottky TTL process | Delivers 34 MHz max frequency with 2.4–4 mA ICC, achieving superior speed/power ratio vs. standard LS TTL |
Applications
| Digital Control Sequencing | Industrial PLC Input Latching |
|---|---|
Use Scenario: Capturing momentary sensor signals in programmable logic controllers to prevent contact bounce artifacts. IC Role / Device Role / Timing Role: Dual D flip-flop providing synchronized, debounced latching of two independent input channels. Use Value: Asynchronous clear enables hardware-initiated reset on fault detection; 34 MHz capability supports fast scan cycles in modern PLCs. | Use Scenario: Storing machine-state bits during power interruption or controller reboot sequences. IC Role / Device Role / Timing Role: Edge-triggered storage element preserving operational mode flags across transient brownouts. Use Value: Preset and clear inputs allow deterministic initialization at startup; PDIP package supports through-hole reliability in harsh factory environments. |
| Synchronous Counter Building Block | TTL-Level Clock Domain Interface |
Use Scenario: Constructing 4-bit binary counters using cascaded DFF stages with feedback logic. IC Role / Device Role / Timing Role: Fundamental storage cell enabling ripple or synchronous counter topologies in discrete logic systems. Use Value: 14.5 ns minimum clock pulse width and 3–18 ns propagation delays ensure stable carry propagation at 34 MHz maximum count rate. | Use Scenario: Bridging timing domains between legacy TTL microcontrollers and newer CMOS peripherals. IC Role / Device Role / Timing Role: Level-shifting and edge-synchronized interface buffer maintaining signal integrity across voltage-compatible logic families. Use Value: TTL-compatible VIH/VIL thresholds and ±8 mA drive strength enable direct connection to 74LS/74F series without level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS74AN | Identical electrical specs, same Fairchild ALS process, identical pinout and package (N14A) | No functional difference - direct second-source part with identical qualification and test flow | Select when requiring alternate sourcing under TI's manufacturing and traceability framework |
| DM74LS74AN | Slower max frequency (25 MHz), higher ICC (6–10 mA), same pinout and PDIP package | Acceptable where lower speed and higher power are tolerable; not suitable for 30+ MHz designs | Choose for cost-sensitive legacy systems where ALS speed/power advantage is unnecessary |
Compared with SN74ALS74AN, DM74ALS74AN offers identical performance and form factor but different supply chain provenance; versus DM74LS74AN, it delivers 36% higher clock rate and ~40% lower supply current-critical for thermally constrained or high-throughput logic designs.
Availability
DM74ALS74AN is available at Aetrix Electronics and suitable for industrial control panels, legacy TTL-based instrumentation, and repair/replacement programs requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS74AN 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, power management, and logic devices before its acquisition by ON Semiconductor in 2016.
The DM74ALS74AN belongs to Fairchild's Advanced Low-Power Schottky (ALS) TTL logic family, designed specifically to replace standard LS TTL in speed-critical, power-constrained industrial and computing applications.
FAQ
What is the maximum operating temperature range for DM74ALS74AN?
The DM74ALS74AN is rated for operation from 0°C to +70°C ambient temperature, as specified in the Recommended Operating Conditions table. This range applies to all electrical and switching characteristics, including 34 MHz maximum clock frequency and guaranteed propagation delays. Operation outside this range may result in parametric degradation or functional failure.
Does DM74ALS74AN support true dual independent operation?
Yes, DM74ALS74AN contains two completely independent D flip-flops, each with dedicated D, CLK, PR, CLR, Q, and Q̅ terminals. There is no shared internal logic or timing dependency between sections-enabling simultaneous, asynchronous control of separate data paths without crosstalk or timing interference.
Is DM74ALS74AN pin-compatible with standard 74LS74 devices?
Yes, DM74ALS74AN is functionally and pin-for-pin compatible with 74LS74 and other LS TTL dual D flip-flops. Its 14-lead PDIP (N14A) footprint matches JEDEC MS-001, and all terminal assignments-including dual sets of I/O and shared VCC/GND-align exactly with industry-standard 74xx74 layouts.
What is the purpose of the "↑" symbol in the DM74ALS74AN function table?
The "↑" symbol in the DM74ALS74AN function table explicitly denotes the positive-going edge of the clock signal as the sole valid trigger event for data transfer from D to Q. It confirms that the device is edge-triggered-not level-sensitive-and ignores D input changes occurring outside the rising transition, ensuring deterministic state updates.
Can DM74ALS74AN be used in new designs despite its 1986 datasheet revision date?
Yes, DM74ALS74AN remains viable for new designs where TTL-level logic, through-hole assembly, and proven reliability are prioritized. Its specifications are fully characterized and supported by ON Semiconductor (post-Fairchild acquisition), and Aetrix Electronics maintains active inventory with full traceability and extended lifecycle support.
DM74ALS74AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALS
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 34 MHz
- Max Propagation Delay @ V, Max CL:
- 18ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 400µA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-MDIP
DM74ALS74AN FAQ
1.How can I place an order for DM74ALS74AN through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS74AN 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 DM74ALS74AN reliable?
The price and inventory of DM74ALS74AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS74AN is usually 5 days.
3.What payment methods are accepted for DM74ALS74AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS74AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS74AN?
DM74ALS74AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS74AN 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 DM74ALS74AN?
For technical support, including DM74ALS74AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS74AN requirements.
6.How does Aetrix verify that DM74ALS74AN is sourced from the original manufacturer or authorized distributors?
All DM74ALS74AN 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 DM74ALS74AN meets industry standards.
7.What is the process for return or replacement of DM74ALS74AN?
All DM74ALS74AN units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS74AN, 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 DM74ALS74AN part is unused and in its original packaging.
Return procedure for DM74ALS74AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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