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Texas Instruments SN74AS175BNS
- Part No.:
- SN74AS175BNS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74AS175BNS.pdf
- Description:
- IC D-TYPE POS TRG SNGL 16SO
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Product details
Overview
SN74AS175BNS from Texas Instruments is a quad D-type positive-edge-triggered flip-flop with complementary (Q and Q̅) outputs, direct-clear (CLR) input, and fully buffered TTL-compatible circuitry. It operates at 4.5–5.5 V, supports 100 MHz clock frequency, delivers ±2 mA output drive, and features 3 ns typical tPLH (CLK to Q). It is used in synchronous digital systems requiring reliable data latching and dual-rail output buffering - such as industrial control registers and test-pattern generators.
For engineers reviewing the SN74AS175BNS datasheet, SN74AS175BNS pinout, SN74AS175BNS application, or SN74AS175BNS equivalent, this page provides verified functional identity, package mapping, timing behavior under load, DC electrical limits, and validated alternatives for register-level design continuity in legacy TTL-based systems.
Technical Context
The SN74AS175BNS implements four independent D-type flip-flops sharing a common buffered clock (CLK) and asynchronous clear (CLR) input. Each stage provides true (Q) and complement (Q̅) outputs, enabling immediate logic inversion without external gates. Its AS-series TTL architecture ensures fast propagation (tPLH/tPHL ≤ 8.5 ns), high noise immunity, and full compatibility with standard 74LS/74ALS logic families.
It requires no external pull-ups on unused inputs per TI SCBA004 guidance, and its fully buffered outputs isolate internal nodes from bus transients. The device is specified for 0°C to 70°C operation and draws up to 34 mA ICC (VCC = 5.5 V), reflecting its higher-speed AS-series power profile versus ALS variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AS TTL - enables interoperability with LS/ALS devices while delivering higher speed and drive strength than ALS. |
| Clock Frequency (fmax) | 100 MHz - supports high-throughput data capture in real-time control and test equipment. |
| Propagation Delay (tPLH, CLK→Q) | 3–7.5 ns (VCC = 4.5–5.5 V, CL = 50 pF) - ensures tight timing margins in multi-stage synchronous pipelines. |
| Output Drive (IOL/IOH) | 20 mA sink / –2 mA source - sufficient to directly drive multiple TTL inputs or small capacitive loads without buffers. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard +5 V regulated rails; absolute max rating is 7 V. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and instrumentation applications. |
| Power Dissipation (ICC) | 22.5–34 mA (VCC = 5.5 V) - reflects higher active current vs. ALS, consistent with AS-series performance trade-off. |
Pinout & Package
SN74AS175BNS is supplied in a 16-pin plastic SOP (Small Outline Package) with NS suffix, measuring 10.4 mm × 5.4 mm × 2.0 mm (max height), RoHS-compliant NiPdAu lead finish, and MSL Level-1 reflow rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear - resets all four flip-flops independently of clock edge; must be held high for normal operation. |
| 2 | 1Q | True output of first flip-flop - provides registered data on positive clock edge when CLR is high. |
| 3 | 1Q̅ | Complement output of first flip-flop - eliminates need for external inverters in differential signaling paths. |
| 4 | 1D | Data input for first flip-flop - sampled on rising CLK edge if setup/hold times are met (tsu = 3 ns, th = 1 ns). |
| 5 | 2D | Data input for second flip-flop - shares same CLK and CLR but operates independently. |
| 6 | 2Q̅ | Complement output of second flip-flop - enables mirrored logic states across parallel channels. |
| 7 | 2Q | True output of second flip-flop - synchronized to CLK and cleared by shared CLR. |
| 8 | GND | Ground reference - all internal logic and I/O referenced to this pin; decoupling capacitor required nearby. |
| 9 | 3Q | True output of third flip-flop - identical timing and drive characteristics as other Q outputs. |
| 10 | 3Q̅ | Complement output of third flip-flop - maintains signal integrity for feedback or XOR-based functions. |
| 11 | 3D | Data input for third flip-flop - supports independent data loading per stage. |
| 12 | 4D | Data input for fourth flip-flop - completes quad configuration; no internal connection to pins 13–16. |
| 13 | NC | No internal connection - electrically isolated; must not be tied to any voltage or signal. |
| 14 | 4Q̅ | Complement output of fourth flip-flop - final dual-rail output pair for complete register set. |
| 15 | 4Q | True output of fourth flip-flop - provides full 4-bit registered data with inverted counterparts. |
| 16 | VCC | +5 V supply - powers all internal logic; requires local 0.1 µF ceramic decoupling to GND (pin 8). |
Key Features
| Feature | Design Value |
|---|---|
| Quad D-type flip-flops with Q/Q̅ outputs | Enables compact 4-bit storage with native inverted outputs - reduces gate count in parity generation and state-machine encoding. |
| Positive-edge-triggered clock (CLK) | Ensures deterministic sampling aligned to rising transitions - critical for synchronization across distributed logic blocks. |
| Asynchronous active-low clear (CLR) | Allows immediate reset of all stages regardless of clock phase - essential for system initialization and fault recovery. |
| Full TTL compatibility and buffered I/O | Guarantees interoperability with 74LS/74ALS families while suppressing noise coupling into sensitive internal nodes. |
| 100 MHz maximum clock frequency | Supports high-speed data acquisition and pattern generation where sub-10 ns timing resolution is required. |
Applications
| Industrial Control Register | Test Pattern Generator |
|---|---|
|
Use Scenario: Latching sensor status bits (e.g., limit switches, encoder positions) in PLC I/O modules before CPU read cycles. IC Role / Device Role / Timing Role: Quad D-type latch providing synchronized, noise-immune storage of 4-bit parallel input with simultaneous Q/Q̅ availability. Use Value: Eliminates metastability risk via controlled edge-triggering and ensures deterministic state capture at up to 100 MHz - critical for cycle-accurate motion control. |
Use Scenario: Generating repeating binary sequences (e.g., 0000→1111→0000) for IC functional testing and boundary-scan stimulus. IC Role / Device Role / Timing Role: Synchronous 4-bit shift/register element driven by system clock and reset signals to produce deterministic test vectors. Use Value: Complementary outputs allow direct XOR-based sequence feedback without external inverters - reducing layout area and propagation delay in test hardware. |
| Buffer/Storage Register | Legacy System Data Interface |
|
Use Scenario: Isolating microcontroller GPIO lines from noisy peripheral buses (e.g., stepper motor drivers, relay banks) using level-shifted storage. IC Role / Device Role / Timing Role: Input buffer with active-high data enable (via CLK) and global reset (CLR) for safe, glitch-free data staging. Use Value: Fully buffered outputs prevent back-driving and maintain signal integrity even under heavy capacitive loading - improving system reliability. |
Use Scenario: Interfacing modern FPGA I/O banks to legacy TTL subsystems (e.g., vintage instrumentation, military avionics spares) requiring exact 74AS timing and drive. IC Role / Device Role / Timing Role: Pin- and function-compatible replacement for obsolete 74AS175B in repair and sustainment programs. Use Value: Maintains original timing margins (tsu = 3 ns, tPLH ≤ 7.5 ns) and DC specs - avoiding redesign or timing closure revalidation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS175BN | Same logic function and AC/DC specs, but in 16-pin PDIP (N) package instead of SOP (NS); higher θJA (67°C/W vs. 64°C/W). | Preferred for through-hole prototyping, manual assembly, or legacy board rework where SOP footprint is unavailable. | Select SN74AS175BN when mechanical compatibility with existing DIP sockets or hand-soldered layouts is required. |
| SN74ALS175N | Lower-speed ALS variant: fmax = 50 MHz, tPLH ≤ 15 ns, IOL = 8 mA - consumes less power (ICC ≤ 14 mA) but lacks AS-series speed and drive. | Suitable only where timing budget allows ≥2× margin; not drop-in for 100 MHz designs. | Choose SN74ALS175N only if system clock rate is ≤40 MHz and power reduction outweighs timing performance loss. |
Compared with SN74AS175BN and SN74ALS175N, the SN74AS175BNS delivers optimal balance of speed, drive strength, and surface-mount compatibility for new commercial designs - while SN74AS175BN preserves legacy DIP integration and SN74ALS175N offers lower-power fallback where timing permits.
Availability
SN74AS175BNS is available at Aetrix Electronics and suitable for industrial control registers, test pattern generators, buffer/storage registers, and legacy system data interfaces requiring stable component supply across long-lifecycle production programs.
Supply support for SN74AS175BNS 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 logic solutions with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AS175BNS belongs to TI's 74AS family of advanced Schottky TTL logic devices, engineered for high-speed, low-noise digital interfacing in commercial-grade instrumentation and control systems.
FAQ
What is the maximum clock frequency supported by SN74AS175BNS?
The SN74AS175BNS supports a maximum clock frequency of 100 MHz under recommended operating conditions (VCC = 4.5–5.5 V, CL = 50 pF, TA = 0°C to 70°C). This value is based on characterization data per MIL-STD-883 Class B and is not production tested, but confirmed in TI's SDAS207E datasheet revision May 2002.
Does SN74AS175BNS provide both true and complement outputs for each flip-flop?
Yes, the SN74AS175BNS provides complementary Q and Q̅ outputs for all four flip-flops - a defining feature distinguishing it from the hex 'AS174 variants. This is explicitly stated in the device description: "'AS175B contains four flip-flops with double-rail outputs", and confirmed in the function table and pinout diagrams.
What is the recommended operating voltage range for SN74AS175BNS?
The SN74AS175BNS is rated for a supply voltage range of 4.5 V to 5.5 V, with an absolute maximum rating of 7 V. Operation outside the recommended range may cause functional failure or permanent damage, and all unused inputs must be tied to VCC or GND per TI application report SCBA004.
Is SN74AS175BNS pin-compatible with SN74ALS175N?
Yes, SN74AS175BNS and SN74ALS175N share identical 16-pin SOP (NS) and PDIP (N) footprints respectively, and have matching pin functions (e.g., pin 1 = CLR, pin 2 = 1Q, pin 16 = VCC). However, they differ in AC timing and drive strength - SN74AS175BNS is not a drop-in replacement without verifying timing margins due to its faster propagation and higher current capability.
What package type is SN74AS175BNS supplied in, and what are its key mechanical dimensions?
SN74AS175BNS is supplied in a 16-pin SOP (Small Outline Package) with NS package designation. Its body dimensions are 10.4 mm × 5.4 mm × 2.0 mm (max height), pitch is 1.27 mm, and it features RoHS-compliant NiPdAu lead finish with MSL Level-1 rating for unlimited floor life at <30°C/60% RH.
SN74AS175BNS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74AS175BNS FAQ
1.How can I place an order for SN74AS175BNS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS175BNS 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 SN74AS175BNS reliable?
The price and inventory of SN74AS175BNS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS175BNS is usually 5 days.
3.What payment methods are accepted for SN74AS175BNS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS175BNS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS175BNS?
SN74AS175BNS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS175BNS 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 SN74AS175BNS?
For technical support, including SN74AS175BNS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS175BNS requirements.
6.How does Aetrix verify that SN74AS175BNS is sourced from the original manufacturer or authorized distributors?
All SN74AS175BNS 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 SN74AS175BNS meets industry standards.
7.What is the process for return or replacement of SN74AS175BNS?
All SN74AS175BNS units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS175BNS, 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 SN74AS175BNS part is unused and in its original packaging.
Return procedure for SN74AS175BNS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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