My Inquiry
My Account
onsemi DM74ALS74AM
- Part No.:
- DM74ALS74AM
- Manufacturer:
- onsemi
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DM74ALS74AM.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,678
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DM74ALS74AM from Fairchild Semiconductor is a dual D-type positive-edge-triggered flip-flop with asynchronous preset and clear, used for synchronous data latching and state storage in TTL-based digital logic systems. It operates at 5 V, supports up to 34 MHz clock frequency, features 14.5 ns minimum clock pulse width, and delivers ±8 mA output drive capability.
For engineers reviewing the DM74ALS74AM datasheet, pinout, applications, or equivalent options, key selection considerations include its SOIC-14 package, guaranteed AC performance across 0°C to +70°C, compatibility with LS/Schottky TTL logic families, and low-power ALS process advantages over standard LS74.
Technical Context
The DM74ALS74AM implements two independent edge-triggered storage elements, each with dedicated D, CLK, PR, and CLR inputs plus complementary Q and Q̅ outputs. Its clock triggering responds to voltage threshold crossing-not transition rate-ensuring robust timing behavior under varying slew conditions.
Asynchronous preset and clear operate at active-low logic levels and override clocked operation regardless of CLK state. The device uses oxide-isolated, ion-implanted Schottky TTL technology, delivering improved speed–power trade-offs versus LS-series predecessors while maintaining full functional and pin compatibility.
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 | 34 MHz - defines maximum synchronous data rate per flip-flop stage |
| tPLH / tPHL | 3–18 ns - propagation delay range determines worst-case setup margin in high-speed counters |
| IOL / IOH | 8 mA / −0.4 mA - output drive strength supports direct fan-out to ≥10 standard TTL loads |
| tW(CLK) | 14.5 ns minimum HIGH/LOW pulse width - constrains minimum clock duty cycle for reliable edge detection |
| Operating Temp | 0°C to +70°C - specifies commercial-grade ambient range for industrial control and instrumentation use |
Pinout & Package
DM74ALS74AM is housed in a 14-lead SOIC package (JEDEC MS-012, 0.150" narrow body), with 1.27 mm lead pitch and gull-wing terminations suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1CLR | Asynchronous clear input for first flip-flop; active-low, overrides clocked operation |
| 2 | 1D | Data input for first flip-flop; sampled on rising clock edge |
| 3 | 1CLK | Clock input for first flip-flop; positive-edge-triggered, voltage-threshold sensitive |
| 4 | 1PR | Asynchronous preset input for first flip-flop; active-low, forces Q = HIGH |
| 5 | 1Q | True output of first flip-flop |
| 6 | 1Q̅ | Inverted output of first flip-flop |
| 7 | GND | Ground reference for all internal circuitry and I/O |
| 8 | 2Q̅ | Inverted output of second flip-flop |
| 9 | 2Q | True output of second flip-flop |
| 10 | 2PR | Asynchronous preset input for second flip-flop; active-low |
| 11 | 2CLK | Clock input for second flip-flop; independent positive-edge trigger |
| 12 | 2D | Data input for second flip-flop; sampled on rising edge of 2CLK |
| 13 | 2CLR | Asynchronous clear input for second flip-flop; active-low |
| 14 | VCC | +5 V power supply connection |
Key Features
| Feature | Design Value |
|---|---|
| Positive-edge clocking | Triggering based on input voltage threshold-not edge rate-improves noise immunity in noisy clock environments |
| Asynchronous preset/clear | Dedicated active-low PR/CLR per flip-flop enables immediate state initialization without waiting for clock edge |
| ALS Schottky process | Delivers ~2× speed improvement over LS74 at ~50% lower power consumption (4 mA typical ICC vs LS74's ~8 mA) |
| Pin-for-pin compatibility | Direct replacement for DM74LS74A and 74S74 in existing PCB layouts without redesign |
| Guaranteed AC specs | Switching parameters validated across full temperature and supply range (0°C to +70°C, 4.5–5.5 V) |
Applications
| Serial Data Synchronization | Asynchronous Reset Circuits |
|---|---|
Use Scenario: Aligning incoming serial bit streams to local system clock domains in UART interfaces or shift register controllers. IC Role / Device Role / Timing Role: Dual D flip-flop acting as synchronized input latch, capturing data on rising CLK edge while suppressing metastability via setup/hold compliance. Use Value: Enables reliable sampling of asynchronous signals with 15 ns data setup time and 0 ns hold time, reducing bit error rates in legacy communication links. | Use Scenario: Initializing microcontroller peripheral registers or FPGA configuration states during power-up or fault recovery. IC Role / Device Role / Timing Role: Providing hardware-level reset assertion to downstream logic blocks using active-low CLR inputs tied to system reset net. Use Value: Guarantees deterministic Q = LOW state within 13 ns of CLR activation, independent of clock presence-critical for fail-safe startup sequencing. |
| Frequency Division (÷2) | State Machine Registers |
Use Scenario: Building binary counters or clock dividers in digital signal generators and timing synthesizers. IC Role / Device Role / Timing Role: Configured as toggle flip-flop (D fed from Q̅) to halve input clock frequency with precise 50% duty cycle output. Use Value: Achieves 34 MHz maximum divide frequency with <18 ns propagation skew between Q and Q̅, preserving timing integrity in PLL feedback paths. | Use Scenario: Storing current state bits in finite-state machines for industrial PLCs and protocol decoders. IC Role / Device Role / Timing Role: Serving as edge-triggered state register where D inputs reflect next-state logic and CLK advances machine on system timing edge. Use Value: Supports multi-stage pipeline designs with 16 ns max tPHL, enabling >25 MHz state transition rates in combinatorial control logic. |
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 | Same ALS process, identical AC/DC specs, but in PDIP-14 (N14A) package instead of SOIC-14 | Preferred for through-hole prototyping or legacy board repair where SOIC footprint is unavailable | Select SN74ALS74AN when manual soldering or socket-based testing is required |
| MC74AC74DG | CMOS-based (74AC), higher speed (125 MHz fMAX), wider VCC range (2–6 V), but different input thresholds and no guaranteed ALS TTL compatibility | Suitable for mixed-voltage systems or low-power battery-operated designs where TTL-level interoperability is not mandatory | Choose MC74AC74DG only after verifying level-shifting or interface conditioning for legacy TTL bus connections |
Compared with SN74ALS74AN and MC74AC74DG, the DM74ALS74AM uniquely balances proven TTL compatibility, SOIC surface-mount readiness, and commercial-temperature reliability-making it optimal for volume-manufactured industrial control boards requiring drop-in LS74 upgrades without layout change.
Availability
DM74ALS74AM is available at Aetrix Electronics and suitable for industrial automation controllers, legacy test equipment refurbishment, and embedded timing subsystems requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS74AM 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 manufacturer specializing in analog and discrete power products, acquired by ON Semiconductor in 2016.
The DM74ALS74AM belongs to Fairchild's advanced low-power Schottky (ALS) TTL logic family, designed specifically to replace standard LS TTL devices with superior speed–power efficiency in commercial-grade digital systems.
FAQ
What is the maximum clock frequency supported by the DM74ALS74AM?
The DM74ALS74AM supports a maximum clock frequency of 34 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to +70°C). This value is guaranteed by the manufacturer's switching characteristics table and reflects the highest rate at which reliable positive-edge-triggered data transfer occurs between D and Q outputs. Exceeding this limit may result in setup/hold violations or metastability.
Does the DM74ALS74AM require external pull-up resistors on preset and clear inputs?
No, the DM74ALS74AM does not require external pull-up resistors on PR or CLR inputs because these pins are internally biased to recognize a valid HIGH level at ≥2.0 V (VIH specification). However, in floating-input scenarios, external 10 kΩ pull-ups to VCC are recommended to prevent unintended low-level assertion due to noise or leakage, especially in high-impedance PCB traces.
Is the DM74ALS74AM pin-compatible with the standard 74LS74?
Yes, the DM74ALS74AM is functionally and pin-for-pin compatible with the 74LS74 and other LS/Schottky TTL dual D flip-flops. Its pinout matches JEDEC-standard 14-lead configurations, allowing direct substitution in existing designs. Electrical differences-such as lower ICC and faster tPLH/tPHL-are enhancements, not incompatibilities, and do not affect PCB layout or interconnect.
What is the meaning of "ALS" in DM74ALS74AM?
"ALS" stands for Advanced Low-Power Schottky, denoting Fairchild's proprietary bipolar logic process that combines Schottky diode clamping for speed with optimized transistor sizing and isolation to reduce power consumption. Compared to standard LS TTL, the ALS process delivers approximately double the speed at half the supply current-evident in the DM74ALS74AM's 34 MHz fMAX and 4 mA typical ICC versus LS74's ~17 MHz and ~8 mA.
Can the DM74ALS74AM operate at 3.3 V supply voltage?
No, the DM74ALS74AM is not rated for 3.3 V operation. Its recommended VCC range is strictly 4.5 V to 5.5 V, and absolute maximum rating is 7 V. At 3.3 V, internal transistor biasing fails, resulting in undefined output states, excessive propagation delay, or complete functional failure. For 3.3 V systems, consider CMOS alternatives like 74AC74 or level-shifted interface solutions.
DM74ALS74AM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALS
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
DM74ALS74AM FAQ
1.How can I place an order for DM74ALS74AM through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS74AM 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 DM74ALS74AM reliable?
The price and inventory of DM74ALS74AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS74AM is usually 5 days.
3.What payment methods are accepted for DM74ALS74AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS74AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS74AM?
DM74ALS74AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS74AM 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 DM74ALS74AM?
For technical support, including DM74ALS74AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS74AM requirements.
6.How does Aetrix verify that DM74ALS74AM is sourced from the original manufacturer or authorized distributors?
All DM74ALS74AM 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 DM74ALS74AM meets industry standards.
7.What is the process for return or replacement of DM74ALS74AM?
All DM74ALS74AM units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS74AM, 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 DM74ALS74AM part is unused and in its original packaging.
Return procedure for DM74ALS74AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DM74ALS74AM Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
