My Inquiry
My Account
Texas Instruments SN74ALS577ANT
- Part No.:
- SN74ALS577ANT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ALS577ANT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,056
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ALS577ANT from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state inverting outputs, designed for bus driving in TTL-compatible digital systems. It features synchronous clear (CLR), buffered control inputs, and operates from 0°C to 70°C at 4.5–5.5 V supply. Its bus-structured pinout enables direct connection to data buses in I/O ports and working registers.
For engineers reviewing the SN74ALS577ANT datasheet, SN74ALS577ANT pinout, SN74ALS577ANT application, or SN74ALS577ANT equivalent, this device is selected for high-reliability 8-bit latched bus interface where controlled output enable, clock-edge registration, and legacy TTL-level compatibility are required.
Technical Context
This device implements eight independent D-type flip-flops, each triggered on the low-to-high transition of CLK. Internal synchronous clear (CLR) resets all Q outputs to high level (inverted logic) when asserted low, independent of clock edge timing.
Output-enable (OE) controls 3-state output drivers without affecting internal register state-data can be retained or updated while outputs remain high-impedance. The architecture supports bidirectional bus operation via external OE coordination and avoids bus contention during state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS) TTL - ensures compatibility with legacy 74LS/74S systems and lower power than standard TTL. |
| Supply Voltage Range | 4.5 V to 5.5 V - supports stable operation across industrial-grade 5 V rail tolerances. |
| Max Clock Frequency | 30 MHz - enables reliable 33.3 ns minimum clock period for high-speed register transfer in vintage computing and control backplanes. |
| Output Drive Capability | IOL = 24 mA / IOH = −2.6 mA - sufficient to drive 10+ 74ALS loads or terminate unterminated PCB traces up to 15 cm. |
| Propagation Delay (tPLH/tPHL) | 4–14 ns - guarantees sub-15 ns register-to-bus latency critical for cycle-accurate timing in synchronous bus protocols. |
| Setup/Hold Time (tsu/th) | 15 ns / 0 ns - requires data stability 15 ns before CLK↑; no hold constraint simplifies timing margining in static-data bus environments. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial embedded control applications, not extended/military range. |
Pinout & Package
SN74ALS577ANT uses a 24-pin plastic dual in-line package (PDIP-NT), 300-mil width, with standard through-hole mounting and bus-structured pin layout optimized for parallel data routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low 3-state control; disables all Q outputs to high impedance without altering internal register state. |
| 2–9 | 1D–8D | Data inputs for eight D-type flip-flops; sampled on rising CLK edge. |
| 10 | GND | Ground reference for all logic and output stages. |
| 11–18 | 1Q–8Q | Inverting 3-state outputs; reflect registered D values when OE is low. |
| 19 | VCC | +5 V supply pin; decoupling capacitor placement near this pin is mandatory for noise immunity. |
| 20 | CLK | Common clock input; rising-edge sensitive for simultaneous 8-bit capture. |
| 21 | CLR | Synchronous clear input; low-active reset that forces all Q outputs high (inverted) on next CLK↑. |
| 22–24 | NC | No internal connection; must be left unconnected per TI specification. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type with synchronous clear | Enables atomic reset of all 8 bits on clock edge-critical for pipeline initialization and error recovery in bus controllers. |
| 3-state inverting outputs | Allows direct connection to shared data buses without external inverters; OE gating prevents contention during read/write arbitration. |
| Bus-structured pinout | Groups D inputs (pins 2–9) and Q outputs (pins 11–18) contiguously-reduces PCB trace crosstalk and simplifies layout in 8-bit data paths. |
| Buffered control inputs (OE, CLR, CLK) | Improves noise immunity and fan-out capability; supports reliable operation with long traces or multiple gate loads. |
| ALS logic family performance | Delivers 30 MHz operation with 24 mA sink current at <15 mW per flip-flop-optimized for power-constrained legacy system upgrades. |
Applications
| Industrial PLC Backplane Interface | Legacy Computer I/O Expansion |
|---|---|
|
Use Scenario: Interfacing microprocessor address/data buses to isolated I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Acts as an 8-bit latched transceiver buffer with synchronized clear, isolating CPU bus from field-side peripherals. Use Value: Prevents bus contention during module hot-swap via OE-controlled high-Z state and ensures deterministic reset behavior across all channels using shared CLR. |
Use Scenario: Adding parallel printer or floppy disk controller interfaces to 1980s-era 8-bit computers (e.g., IBM PC/XT, Apple II). IC Role / Device Role / Timing Role: Serves as bidirectional data latch and bus driver, registering outbound commands and buffering inbound status signals. Use Value: Matches original system timing budgets (≤30 MHz clock, ≤15 ns setup) and provides TTL-compatible voltage levels required by vintage peripheral ASICs. |
| Test Equipment Digital Pattern Generator | Avionics Data Acquisition Module |
|
Use Scenario: Generating precise, synchronized 8-bit stimulus patterns for IC functional testing in ATE systems. IC Role / Device Role / Timing Role: Functions as a clocked pattern register with glitch-free output enable, ensuring clean signal edges at test head connectors. Use Value: Sub-15 ns propagation delay and zero hold time simplify timing generator design; NC pins allow mechanical keying for board-level orientation verification. |
Use Scenario: Capturing sensor data from analog-to-digital converters in airborne flight control subsystems. IC Role / Device Role / Timing Role: Latches ADC output words into a buffered holding register prior to serial transmission over ARINC 429 or MIL-STD-1553 buses. Use Value: Synchronous CLR allows coordinated reset across multiple SN74ALS577ANT devices during system power-up or fault recovery sequences. |
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 |
|---|---|---|---|
| SN74ALS576BN | Lacks synchronous clear (CLR); uses asynchronous master reset tied to VCC/GND. | Suitable only where global reset is handled externally or via power-on sequencing-not for cycle-synchronized recovery. | Select SN74ALS576BN if CLR functionality is unnecessary and cost minimization is prioritized. |
| SN74AS576N | Faster (125 MHz max clock), higher drive (48 mA sink), but consumes ~5× more ICC (125 mA vs 24 mA typical). | Better for high-speed test fixtures; less suitable for thermally constrained or battery-backed systems. | Choose SN74AS576N only when timing margins demand >30 MHz operation and power budget permits. |
Compared with SN74ALS577ANT, SN74ALS576BN omits synchronous reset-limiting use in fault-tolerant designs-while SN74AS576N trades power efficiency for speed, making it incompatible in thermally dense legacy chassis layouts.
Availability
SN74ALS577ANT is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, legacy computer I/O expansion, test equipment digital pattern generation, and avionics data acquisition modules requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS577ANT 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and aerospace heritage.
SN74ALS577ANT belongs to TI's legacy 74ALS logic family, engineered for high-speed, low-power bus interfacing in commercial and industrial control systems requiring TTL compatibility and robust timing margins.
FAQ
What is the function of the CLR pin on the SN74ALS577ANT?
The CLR (Clear) pin on the SN74ALS577ANT is a synchronous active-low input that forces all eight Q outputs to a high level (due to inverting output structure) on the next rising edge of CLK. It does not affect the internal D-input sampling path outside of that clock edge, enabling deterministic multi-bit reset aligned to system timing.
Does the SN74ALS577ANT support hot-swapping on a live bus?
The SN74ALS577ANT supports controlled bus disconnection via its OE pin, which places outputs in high-impedance state without disturbing internal register contents. However, it lacks built-in bus-fault protection or power-up/down sequencing logic, so external current-limiting resistors and staggered power application are recommended for true hot-swap operation.
Can the SN74ALS577ANT be used with 3.3 V logic systems?
No, the SN74ALS577ANT is specified only for 4.5 V to 5.5 V operation and requires TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). Direct connection to 3.3 V systems risks undervoltage lockout and unreliable switching; level-shifting circuitry is required for interoperability.
What is the significance of the "NT" suffix in SN74ALS577ANT?
The "NT" suffix in SN74ALS577ANT denotes a plastic dual in-line package (PDIP) with 300-mil body width and standard lead spacing, manufactured using Texas Instruments' legacy NT process line. It is functionally identical to the N-suffix variant but reflects specific mold compound, leadframe, and screening history per TI's historical packaging nomenclature.
How does the SN74ALS577ANT differ from the SN74ALS577A in DW package?
The SN74ALS577ANT (PDIP-NT) and SN74ALS577ADWR (SOIC-DW) share identical logic functionality, AC/DC specifications, and timing parameters. The difference lies solely in package type: NT is through-hole PDIP for prototyping and legacy repair; DW is surface-mount SOIC for automated assembly and space-constrained boards.
SN74ALS577ANT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Master Reset
- 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:
- 24-PDIP
SN74ALS577ANT FAQ
1.How can I place an order for SN74ALS577ANT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS577ANT 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 SN74ALS577ANT reliable?
The price and inventory of SN74ALS577ANT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS577ANT is usually 5 days.
3.What payment methods are accepted for SN74ALS577ANT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS577ANT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS577ANT?
SN74ALS577ANT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS577ANT 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 SN74ALS577ANT?
For technical support, including SN74ALS577ANT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS577ANT requirements.
6.How does Aetrix verify that SN74ALS577ANT is sourced from the original manufacturer or authorized distributors?
All SN74ALS577ANT 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 SN74ALS577ANT meets industry standards.
7.What is the process for return or replacement of SN74ALS577ANT?
All SN74ALS577ANT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS577ANT, 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 SN74ALS577ANT part is unused and in its original packaging.
Return procedure for SN74ALS577ANT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ALS577ANT 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
