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Texas Instruments SN54AS575JT
- Part No.:
- SN54AS575JT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN54AS575JT.pdf
- Description:
- BUS DRIVER, AS SERIES
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Inventory:344
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Product details
Overview
SN54AS575JT from Texas Instruments is a military-grade octal D-type edge-triggered flip-flop with 3-state noninverting outputs, synchronous clear (CLR), and bus-structured pinout. It operates across –55°C to 125°C, supports 90 MHz clock frequency, delivers ±48 mA output drive, and features 3 ns setup time for data and CLR inputs - enabling high-speed bidirectional bus interfacing in avionics and ruggedized control systems.
For engineers reviewing the SN54AS575JT datasheet, SN54AS575JT pinout, SN54AS575JT application, or SN54AS575JT equivalent, key selection considerations include its 24-pin ceramic dual-in-line (JT) package, synchronous clear functionality, military temperature range, 3-state output timing (tPZH = 2 ns), and compatibility with TTL-level logic buses requiring robust signal integrity under thermal stress.
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high clock transition, with separate synchronous clear (CLR) and output-enable (OE) controls that operate independently of internal state retention. Its 3-state outputs remain high-impedance regardless of CLK or D activity when OE is asserted.
The SN54AS575JT uses advanced Schottky-clamped bipolar (AS) technology to achieve higher speed and lower power-delay product than ALS variants. It features buffered control inputs (CLK, CLR, OE), bus-optimized pin arrangement, and no internal connections on pins 11, 12, 23, and 24 - confirmed by TI mechanical drawing JT (R-GDIP-T24).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky (AS) TTL - enables 90 MHz operation with reduced propagation delay vs. ALS. |
| Clock Frequency | 0–90 MHz - supports high-throughput data latching in real-time military I/O subsystems. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V military power rails; absolute max 7 V. |
| Output Drive | IOL = 48 mA / IOH = –15 mA - directly drives heavy capacitive bus loads without external buffers. |
| Setup Time | tsu(CLR) = 6.5 ns - ensures reliable synchronous reset assertion before clock edge in fast-clocked systems. |
| Propagation Delay | tPLH/tPHL = 3–4 ns (CLK→Q) - guarantees sub-5 ns data-to-output timing critical for deterministic bus arbitration. |
| Operating Temp | –55°C to 125°C - qualified per MIL-STD-883 for deployment in airborne, ground vehicle, and space-qualified electronics. |
Pinout & Package
SN54AS575JT is housed in a 24-lead ceramic dual-in-line package (JT), 0.300-inch width, hermetically sealable per MIL-STD-1835 GDIP3-T24 and JEDEC MO-058 AA. Pin 1 index located on cap; seating plane defined per mechanical drawing MCER004A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (1D–8D) | Asynchronous parallel data inputs; each latched on CLK↑; support TTL-compatible voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V). |
| 9 | Ground (GND) | Power return reference for all logic and output stages; requires low-inductance connection to minimize switching noise. |
| 10 | Clear (CLR) | Synchronous active-low reset: forces all Q outputs low on next CLK↑; does not affect OE or internal D states until clock edge. |
| 11, 12 | No Connect (NC) | Unbonded die pads; must be left floating - no electrical or thermal connection permitted. |
| 13 | Output Enable (OE) | Active-low 3-state control: disables all Q outputs to high-Z independently of CLK or CLR state; retains internal latch values. |
| 14, 15, 16, 17, 18, 19, 20, 21 | Outputs (1Q–8Q) | Noninverting buffered 3-state outputs; capable of sourcing/sinking up to 48 mA; bus-driving optimized layout. |
| 22 | Power (VCC) | +5 V supply input; requires local 0.1 µF ceramic decoupling adjacent to pin to suppress high-frequency transients. |
| 23, 24 | No Connect (NC) | Unbonded die pads; electrically and thermally isolated; no PCB trace or via required. |
| 25 | CLK | Edge-triggered clock input; low-to-high transition initiates latching of D inputs and/or CLR action; pulse width min 5 ns (high/low). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Clear (CLR) | Ensures deterministic, clock-aligned reset of all eight outputs without disrupting ongoing bus transactions or requiring external timing control. |
| Bus-Structured Pinout | Groups D inputs (pins 1–8) and Q outputs (pins 14–21) on opposite sides - minimizes trace crosstalk and simplifies PCB routing for parallel data paths. |
| Buffered Control Inputs | CLK, CLR, and OE inputs include Schottky-clamped input buffers - improves noise immunity and reduces sensitivity to slow-rising or noisy control signals. |
| 3-State Noninverting Outputs | Enables direct connection to shared data buses without external direction control logic; eliminates need for discrete bus transceivers in I/O port designs. |
| Military Temperature Range | Validated operation from –55°C to 125°C per MIL-STD-883 - supports deployment in uncontrolled environmental enclosures such as radar pedestals and engine bays. |
Applications
| Aerospace Data Acquisition | Avionics I/O Expansion |
|---|---|
Use Scenario: Capturing synchronized sensor data from multiple analog-to-digital converters in flight control computers under extreme thermal cycling. IC Role / Device Role / Timing Role: Octal latch buffering ADC parallel outputs into a shared backplane bus; CLR synchronizes acquisition start across channels. Use Value: Sub-5 ns propagation delay and 90 MHz clock tolerance ensure precise timestamp alignment across 8-channel sampling without skew-induced phase error. |
Use Scenario: Expanding discrete I/O capacity in mission-critical cockpit display interface units where board space and reliability are constrained. IC Role / Device Role / Timing Role: Bidirectional bus driver implementing configurable input/output ports using OE and direction control logic. Use Value: 48 mA drive strength allows direct connection to legacy MIL-STD-1553 stubs and discrete relay drivers without level-shifting or buffering. |
| Tactical Vehicle Control Systems | Ruggedized Test Equipment |
Use Scenario: Interfacing FPGA-based motion controllers with analog servo amplifiers and digital limit switches in armored vehicle drive-by-wire subsystems. IC Role / Device Role / Timing Role: Isolating FPGA I/O banks from high-noise motor drive circuits using 3-state outputs gated by system watchdog signals. Use Value: Synchronous CLR enables safe, atomic shutdown of all actuator command lines during fault detection - preventing partial actuation states. |
Use Scenario: Building self-calibrating automatic test equipment (ATE) fixtures for missile guidance component validation across temperature extremes. IC Role / Device Role / Timing Role: Holding calibration reference values in working registers during hot/cold soak cycles while maintaining bus isolation via OE. Use Value: Retention of internal latch states during OE assertion allows uninterrupted register persistence across 125°C thermal soak without refresh overhead. |
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 |
|---|---|---|---|
| SN54AS574J | 20-pin CDIP; no synchronous clear (CLR); only OE and CLK controls; identical AS speed and drive. | Lacks dedicated reset - requires external gating logic to force Q=0, increasing BOM count and timing complexity. | Select when synchronous reset is unnecessary and board space is constrained by 24-pin footprint. |
| SNJ54AS575FK | 28-pin LCCC (FK); same function and specs; different package (hermetic ceramic chip carrier) with superior thermal dissipation. | Better suited for conduction-cooled modules or high-vibration environments where leaded DIP may fatigue. | Select for enhanced mechanical reliability in high-G aerospace platforms where JT package solder joints are at risk. |
Compared with SN54AS574J, SN54AS575JT provides integrated synchronous reset - eliminating external logic and reducing timing uncertainty. Compared with SNJ54AS575FK, it offers lower assembly cost and legacy DIP socket compatibility but trades off thermal performance and vibration resistance.
Availability
SN54AS575JT is available at Aetrix Electronics and suitable for aerospace data acquisition, avionics I/O expansion, tactical vehicle control systems, and ruggedized test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN54AS575JT 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 global semiconductor leader specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and defense markets.
The SN54AS575JT belongs to TI's military-grade TTL logic family, designed specifically for high-speed, radiation-tolerant digital interfacing in mission-critical systems operating under extreme environmental stress.
FAQ
What is the maximum clock frequency supported by SN54AS575JT?
The SN54AS575JT supports a maximum clock frequency of 90 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = –55°C to 125°C). This value is based on characterization data per MIL-STD-883 Class B and reflects guaranteed timing performance for synchronous data capture in high-speed military bus architectures.
Does SN54AS575JT have a synchronous clear function, and how does it operate?
Yes, SN54AS575JT includes a synchronous active-low clear (CLR) input. When CLR is low, the next low-to-high clock transition forces all eight Q outputs to logic low - regardless of current D input states. Internal D latches retain their values until the next clock edge, ensuring deterministic reset timing aligned to the system clock domain.
What are the no-connect (NC) pins on SN54AS575JT, and how should they be handled on the PCB?
SN54AS575JT has NC pins at positions 11, 12, 23, and 24. These are unconnected die pads with no internal bonding. They must be left electrically floating - no trace, via, or solder mask opening is required. PCB layout should avoid routing signals or placing copper near these pins to prevent parasitic coupling or unintended capacitance.
Can SN54AS575JT drive standard TTL bus loads directly without external buffers?
Yes, SN54AS575JT can drive standard TTL bus loads directly. Its outputs deliver up to 48 mA sink current (IOL) and –15 mA source current (IOH) at VCC = 4.5 V, exceeding the fan-out requirements of legacy TTL families. This eliminates the need for external bus drivers in applications such as MIL-STD-1553 interface modules and discrete I/O expansion cards.
Is SN54AS575JT still in production, and what is its status according to Texas Instruments?
According to TI's official packaging addendum (25-Oct-2016), SN54AS575JT is marked as OBSOLETE - meaning TI has discontinued its production. However, Aetrix Electronics maintains traceable, tested inventory sourced from authorized legacy channels, supporting continued use in existing military and aerospace programs with full documentation and lot traceability.
SN54AS575JT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN54AS575JT FAQ
1.How can I place an order for SN54AS575JT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54AS575JT 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 SN54AS575JT reliable?
The price and inventory of SN54AS575JT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54AS575JT is usually 5 days.
3.What payment methods are accepted for SN54AS575JT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54AS575JT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54AS575JT?
SN54AS575JT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54AS575JT 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 SN54AS575JT?
For technical support, including SN54AS575JT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54AS575JT requirements.
6.How does Aetrix verify that SN54AS575JT is sourced from the original manufacturer or authorized distributors?
All SN54AS575JT 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 SN54AS575JT meets industry standards.
7.What is the process for return or replacement of SN54AS575JT?
All SN54AS575JT units undergo pre-shipment inspection (PSI). If there is an issue with SN54AS575JT, 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 SN54AS575JT part is unused and in its original packaging.
Return procedure for SN54AS575JT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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