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onsemi DM74ALS576AN
- Part No.:
- DM74ALS576AN
- Manufacturer:
- onsemi
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
DM74ALS576AN.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,168
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Product details
Overview
DM74ALS576AN from Fairchild Semiconductor is an octal D-type edge-triggered flip-flop with 3-STATE outputs in a 20-lead PDIP package. It features inverting logic, positive-edge clock triggering, 30 MHz maximum clock frequency, 24 mA low-level output drive, and operates over 0°C to +70°C. It serves as a bus-oriented register in data buffering and I/O port applications.
For engineers reviewing the DM74ALS576AN datasheet, pinout, applications, or equivalent options, key selection criteria include its 3-STATE output control independence from internal flip-flop operation, guaranteed switching specs at 50 pF, and compatibility with TTL-level bus systems requiring high-drive, low-impedance isolation.
Technical Context
The DM74ALS576AN implements eight independent inverting D-type flip-flops, each triggered on the positive edge of the clock input. Its output enable (OE) signal controls all eight outputs simultaneously without affecting internal state retention or data loading.
Designed using advanced oxide-isolated, ion-implanted Schottky TTL process, it delivers robust noise immunity and rail-to-rail 3-STATE output behavior - VOH ≥ 2.4 V at IOH = −400 µA and VOL ≤ 0.5 V at IOL = 24 mA under VCC = 4.5–5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | Inverting D-type flip-flop with positive-edge clock trigger |
| Max Clock Frequency | 30 MHz - supports high-speed synchronous data latching in bus interfaces |
| Output Drive | 24 mA sink / −2.6 mA source - drives heavy capacitive loads or low-impedance buses directly |
| 3-STATE Enable | Independent OE pin - places outputs in high-Z without disrupting internal register state |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded and industrial control systems |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL power rails |
| Propagation Delay | 4–14 ns (tPLH/tPHL) - ensures timing predictability in synchronous designs |
Pinout & Package
DM74ALS576AN is housed in a 20-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide, with through-hole mounting and standard 0.1" pin pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low control: LOW enables Q outputs; HIGH forces all outputs to high-impedance |
| 2–9 (D1–D8) | Data Inputs | Asynchronous inputs sampled on rising clock edge; inverted at Q outputs |
| 10 (GND) | Ground | Reference return path for all signals and supply current |
| 11–18 (Q1–Q8) | Complementary Outputs | Inverted D-input states latched on clock rise; 3-STATE when OE is HIGH |
| 19 (CLK) | Clock Input | Positive-edge sensitive; triggers simultaneous update of all eight flip-flops |
| 20 (VCC) | Power Supply | +4.5 V to +5.5 V DC supply for TTL-compatible operation |
Key Features
| Feature | Design Value |
|---|---|
| 3-STATE Output Control | OE pin disables outputs without affecting internal register state - enables safe bus sharing |
| High-Drive Capability | 24 mA sink current supports direct connection to terminated or capacitive bus lines |
| Guaranteed Switching at 50 pF | Timing parameters validated under realistic load conditions - eliminates derating guesswork |
| Full-Temperature Spec Guarantee | All AC/DC parameters specified across 0°C to +70°C - no interpolation required for commercial use |
| Schottky TTL Process | Oxide-isolated, ion-implanted construction - improves speed, noise margin, and reliability vs. standard TTL |
Applications
| Industrial Bus Interface | Data Acquisition Buffering |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy PLC backplane buses operating at 24 V logic levels via level-shifting interface. IC Role / Device Role / Timing Role: Octal latch providing synchronized, 3-STATE-isolated data transfer between CPU and field I/O modules. Use Value: Enables bidirectional bus arbitration without external pull-ups or interface logic; 24 mA drive sustains signal integrity across 10+ foot ribbon cables. | Use Scenario: Capturing parallel ADC output words in real-time measurement systems with variable sampling rates up to 30 MSPS. IC Role / Device Role / Timing Role: Edge-triggered register holding stable snapshot of analog-to-digital conversion result before CPU readout. Use Value: Positive-edge clocking ensures deterministic setup/hold timing; 3-STATE outputs prevent bus contention during multi-channel scan cycles. |
| I/O Port Expansion | Legacy System Emulation |
Use Scenario: Extending limited parallel port resources on 8-bit microcontrollers for driving LED arrays, relays, or character LCDs. IC Role / Device Role / Timing Role: General-purpose output latch with independent output disable for dynamic peripheral multiplexing. Use Value: OE-controlled high-Z allows shared data bus usage across multiple peripherals; inverting logic simplifies active-low device control. | Use Scenario: Replacing obsolete 74LS374-based address/data latches in retro-computing hardware restoration projects. IC Role / Device Role / Timing Role: Pin-compatible functional replacement offering improved speed and drive strength over legacy LS parts. Use Value: 30 MHz max clock and 4–14 ns propagation delay exceed original LS spec - enables stable overclocking of vintage bus architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS576N | Identical logic function, pinout, and DC specs; TI-manufactured variant with same ALS process | No functional deviation - suitable for second-source procurement in existing designs | Select when dual-sourcing or TI-franchised distribution is required |
| DM74ALS374N | Non-inverting output logic; otherwise identical timing, drive, and 3-STATE architecture | Requires logic inversion in upstream circuitry if complemented output behavior is mandatory | Choose only when non-inverting Q outputs align with system-level signal polarity requirements |
Compared with SN74ALS576N and DM74ALS374N, the DM74ALS576AN provides guaranteed inverting output behavior and full temperature-range AC performance - critical for deterministic bus arbitration where output polarity and timing margins must be preserved across environmental extremes.
Availability
DM74ALS576AN is available at Aetrix Electronics and suitable for industrial bus interface, data acquisition buffering, and I/O port expansion requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS576AN 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 of high-performance analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy TTL and ALS logic families remain widely deployed.
The DM74ALS576AN belongs to the Advanced Low-Power Schottky (ALS) logic family, engineered for higher speed and lower power than standard LS TTL while maintaining pin and functional compatibility with industry-standard 74-series registers.
FAQ
What logic polarity does the DM74ALS576AN implement?
The DM74ALS576AN implements inverting D-type flip-flop logic: on the positive clock edge, each Q output assumes the complement of its corresponding D input state. This behavior is confirmed in the Function Table and Logic Diagram of the official Fairchild DS006228 datasheet. The DM74ALS576AN does not offer selectable polarity - inversion is inherent to its architecture.
Does the DM74ALS576AN support hot insertion or live bus connection?
The DM74ALS576AN is not rated for hot insertion. Its absolute maximum rating for voltage applied to disabled outputs is 5.5 V, and no bus-fault protection or power-up sequencing features are specified. For live bus applications, external current-limiting or clamping is required. The DM74ALS576AN should be powered and stabilized before enabling OE or connecting to active bus lines.
What is the minimum pulse width required on the clock input of the DM74ALS576AN?
The DM74ALS576AN requires a minimum clock pulse width of 16.5 ns for both HIGH and LOW states, as specified in the Electrical Characteristics table under parameter tW. This ensures reliable edge detection and state capture. Violating this specification may cause metastability or missed transitions. The DM74ALS576AN's timing is validated at 50 pF load and across the full 0°C to +70°C operating range.
Can the DM74ALS576AN outputs drive a 50 Ω transmission line directly?
No, the DM74ALS576AN outputs are not designed for direct 50 Ω line driving. Its 24 mA sink capability corresponds to ~200 Ω effective output impedance under typical conditions - suitable for unterminated or lightly loaded buses, but insufficient for controlled-impedance PCB traces. For 50 Ω lines, a dedicated line driver or termination network is required alongside the DM74ALS576AN.
Is the DM74ALS576AN pin-compatible with the standard 74LS374?
No, the DM74ALS576AN is not pin-compatible with the 74LS374. While both are octal D-type latches with 3-STATE outputs, the DM74ALS576AN has inverting outputs and different pin assignments - notably OE on pin 1 (vs. CLK on pin 1 for 74LS374) and inverted Q outputs on pins 11–18. Direct substitution would require PCB redesign. The DM74ALS576AN matches the pinout of other 74ALS576 variants, not LS374.
DM74ALS576AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 30 MHz
- Max Propagation Delay @ V, Max CL:
- 14ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 18 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
DM74ALS576AN FAQ
1.How can I place an order for DM74ALS576AN through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS576AN 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 DM74ALS576AN reliable?
The price and inventory of DM74ALS576AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS576AN is usually 5 days.
3.What payment methods are accepted for DM74ALS576AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS576AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS576AN?
DM74ALS576AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS576AN 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 DM74ALS576AN?
For technical support, including DM74ALS576AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS576AN requirements.
6.How does Aetrix verify that DM74ALS576AN is sourced from the original manufacturer or authorized distributors?
All DM74ALS576AN 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 DM74ALS576AN meets industry standards.
7.What is the process for return or replacement of DM74ALS576AN?
All DM74ALS576AN units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS576AN, 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 DM74ALS576AN part is unused and in its original packaging.
Return procedure for DM74ALS576AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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