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Texas Instruments SN74AS175BNSR
- Part No.:
- SN74AS175BNSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AS175BNSR.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,796
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Product details
Overview
SN74AS175BNSR from Texas Instruments is a quad D-type flip-flop with complementary (Q and Q̅) outputs, direct-clear input, and positive-edge clock triggering. It operates at 5 V, supports 100 MHz maximum clock frequency, delivers ±2 mA high-level/20 mA low-level output drive, and is housed in a 16-pin SOP-NS package. It serves as a synchronous storage element in digital control logic and data path buffering.
For engineers reviewing the SN74AS175BNSR datasheet, SN74AS175BNSR pinout, SN74AS175BNSR application, or SN74AS175BNSR equivalent, key selection criteria include its double-rail output architecture, 3 ns minimum CLK-to-Q propagation delay, TTL-compatible input thresholds, and guaranteed operation across 0°C to 70°C industrial temperature range.
Technical Context
The SN74AS175BNSR implements four independent edge-triggered D flip-flops using advanced Schottky (AS) TTL circuitry. Each stage features buffered clock and clear inputs, fully buffered outputs for noise immunity, and complementary Q/Q̅ outputs enabling immediate access to inverted logic states without external inverters.
It requires setup time of 3 ns (data before CLK↑) and hold time of 1 ns (data after CLK↑), with pulse width requirements of 4 ns for CLK high/low and 5 ns for CLR low. Its logic behavior follows standard D-type timing: data stable at D inputs transfers to Q on the positive clock edge, while active-low CLR asynchronously forces both Q and Q̅ to defined states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AS TTL - provides higher speed and lower power than standard 74LS, with compatible voltage thresholds. |
| Flip-Flop Count | 4 independent D-type flip-flops - enables compact implementation of 4-bit registers or parallel load paths. |
| Output Type | Complementary (Q and Q̅) per stage - eliminates need for external inverters in feedback or differential logic paths. |
| Max Clock Frequency | 100 MHz - supports high-speed synchronous logic in industrial controllers and test equipment. |
| Propagation Delay (CLK→Q) | 3–7.5 ns (typ/max) - ensures tight timing margins in pipelined or cascaded register stages. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL bus systems and regulated power rails. |
| Output Drive | –2 mA (IOH), 20 mA (IOL) - sufficient to drive multiple TTL inputs or small capacitive loads directly. |
Pinout & Package
SN74AS175BNSR is supplied in a 16-pin SOP (Small Outline Package) with NS suffix, measuring 10.4 mm × 5.3 mm, 1.27 mm pitch, and 2.00 mm max height. Pin 1 is located at the top-left corner with notch or mark indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Active-low asynchronous clear - resets all four Q outputs to LOW and Q̅ to HIGH regardless of clock state. |
| 2 | 1D | Data input for Flip-Flop 1 - sampled on positive clock edge and transferred to 1Q/1Q̅. |
| 3 | 1Q | True output of Flip-Flop 1 - reflects stored D value after clock edge. |
| 4 | 1Q̅ | Inverted output of Flip-Flop 1 - complements 1Q; no external inverter needed. |
| 5 | 2D | Data input for Flip-Flop 2 - independent channel with identical timing behavior. |
| 6 | 2Q | True output of Flip-Flop 2. |
| 7 | 2Q̅ | Inverted output of Flip-Flop 2. |
| 8 | GND | Ground reference - must be connected to system common return plane. |
| 9 | 3Q̅ | Inverted output of Flip-Flop 3. |
| 10 | 3Q | True output of Flip-Flop 3. |
| 11 | 3D | Data input for Flip-Flop 3. |
| 12 | 4Q̅ | Inverted output of Flip-Flop 4. |
| 13 | 4Q | True output of Flip-Flop 4. |
| 14 | 4D | Data input for Flip-Flop 4. |
| 15 | CLK | Positive-edge-triggered clock - all four flip-flops sample D inputs simultaneously on rising edge. |
| 16 | VCC | +5 V supply - powers internal TTL circuitry; decoupling capacitor recommended near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary Q/Q̅ outputs | Enables direct use in differential signaling, toggle-mode counters, or logic inversion without added gates. |
| 100 MHz operation | Supports high-throughput data latching in real-time instrumentation and digital signal routing. |
| 3 ns min CLK→Q delay | Reduces critical path latency in multi-stage synchronous pipelines and state machines. |
| Full TTL compatibility | Interoperates seamlessly with legacy 74LS, 74F, and other TTL families without level-shifting. |
| Industrial temperature range | Rated for 0°C to 70°C operation - suitable for commercial and industrial embedded control environments. |
Applications
| Industrial PLC I/O Modules | Digital Test Equipment |
|---|---|
|
Use Scenario: Latching sensor status signals (e.g., limit switches, encoder quadrature edges) in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Synchronous register capturing parallel input states on system clock edge; Q/Q̅ outputs feed downstream comparators and interrupt logic. Use Value: Eliminates metastability risk via controlled edge-triggered sampling and provides immediate access to both logic polarities for fault detection. |
Use Scenario: Capturing and holding measurement results (e.g., ADC output words, counter values) during automated test sequence execution. IC Role / Device Role / Timing Role: 4-bit parallel latch synchronizing data from high-speed analog front-end into slower control processor bus. Use Value: 100 MHz clock tolerance allows alignment with fast sampling clocks; complementary outputs simplify bus arbitration and parity generation. |
| Legacy Bus Interface Logic | Real-Time Control State Machines |
|
Use Scenario: Adapting legacy TTL-based address/data bus handshaking between microcontrollers and peripheral ASICs. IC Role / Device Role / Timing Role: Edge-triggered register buffering control strobes (e.g., WR, RD) and status flags across clock domain boundaries. Use Value: Direct TTL compatibility avoids translation ICs; 20 mA sink capability drives LED indicators or optocoupler inputs directly. |
Use Scenario: Implementing finite-state machine registers in motor drive controllers where precise timing and deterministic reset are required. IC Role / Device Role / Timing Role: Storing current state bits with simultaneous asynchronous reset via shared CLR line. Use Value: Single-pin global clear ensures atomic state initialization; Q/Q̅ outputs enable dual-edge transition detection in commutation logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS175NSR | Lower speed (50 MHz max), higher ICC (9–14 mA), ALS family - reduced drive (4–8 mA IOL), longer delays (3–15 ns). | Suitable for cost-sensitive, lower-frequency designs where power and noise immunity are prioritized over speed. | Select when operating frequency ≤50 MHz and system loading is light; verify setup/hold timing margins due to slower edges. |
| SN74AS174NSR | Hex (6-stage) configuration, single-rail outputs only (no Q̅), identical AS speed and drive specs. | Better suited for pure storage register applications requiring more bits but no complementary outputs. | Choose when six D-flip-flops are needed and inverted outputs are unnecessary - saves board space versus two SN74AS175BNSR units. |
Compared with SN74ALS175NSR, SN74AS175BNSR delivers twice the clock frequency and stronger output drive at higher static current; compared with SN74AS174NSR, it trades two extra flip-flops for built-in Q̅ outputs - simplifying designs requiring both polarities per bit.
Availability
SN74AS175BNSR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, digital test equipment, and legacy bus interface logic requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74AS175BNSR 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 decades of heritage in TTL and advanced logic families.
The SN74AS175BNSR belongs to TI's 74AS advanced Schottky TTL logic series, designed for high-speed, noise-immune digital control in industrial, test, and legacy-compatibility applications.
FAQ
What is the function of the CLR pin on the SN74AS175BNSR?
The CLR (clear) pin on the SN74AS175BNSR is an active-low asynchronous input that immediately forces all four Q outputs LOW and all four Q̅ outputs HIGH, independent of the clock signal. This provides deterministic reset capability for system initialization or fault recovery in the SN74AS175BNSR, ensuring synchronized state clearing across all flip-flop stages without waiting for a clock edge.
Does the SN74AS175BNSR require external pull-up resistors on its outputs?
No, the SN74AS175BNSR features totem-pole (push-pull) outputs with active drive in both HIGH and LOW states, eliminating the need for external pull-up resistors. Its IOH of –2 mA and IOL of 20 mA allow direct interfacing with TTL and CMOS inputs, and it meets standard TTL voltage thresholds (VIH = 2 V, VIL = 0.8 V) without additional biasing components in the SN74AS175BNSR application.
Can the SN74AS175BNSR operate reliably at 5.5 V supply?
Yes, the SN74AS175BNSR is rated for VCC from 4.5 V to 5.5 V per its recommended operating conditions, and absolute maximum rating is 7 V. At 5.5 V, it maintains full timing compliance (100 MHz fmax, 3 ns tPLH), though ICC increases to 34 mA typical. System designers should ensure adequate decoupling and thermal margin when operating the SN74AS175BNSR at the upper end of its supply range.
How does the SN74AS175BNSR differ from the SN74AS174NSR in terms of pin compatibility?
The SN74AS175BNSR and SN74AS174NSR share identical 16-pin SOP-NS packages and pinouts for power (VCC, GND), clock (CLK), and clear (CLR), but differ in data/output mapping: SN74AS175BNSR provides four D inputs and eight outputs (Q/Q̅ per stage), while SN74AS174NSR offers six D inputs and six Q outputs only. They are not pin-compatible replacements; PCB layout must match the specific output architecture required by the SN74AS175BNSR or SN74AS174NSR.
Is the SN74AS175BNSR suitable for use in new industrial designs despite its legacy TTL technology?
Yes, the SN74AS175BNSR remains actively produced by Texas Instruments with documented availability through 2026, RoHS-compliant packaging (NIPDAU finish), and full specification support. Its deterministic timing, robust noise immunity, and compatibility with existing 5 V TTL infrastructure make it a reliable choice for new industrial control, test, and retrofit designs where the SN74AS175BNSR's complementary outputs and 100 MHz performance deliver tangible system-level advantages.
SN74AS175BNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 1
- Number of Bits per Element:
- 4
- Clock Frequency:
- 100 MHz
- Max Propagation Delay @ V, Max CL:
- 10ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2mA, 20mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 34 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74AS175BNSR FAQ
1.How can I place an order for SN74AS175BNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS175BNSR 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 SN74AS175BNSR reliable?
The price and inventory of SN74AS175BNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS175BNSR is usually 5 days.
3.What payment methods are accepted for SN74AS175BNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS175BNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS175BNSR?
SN74AS175BNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS175BNSR 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 SN74AS175BNSR?
For technical support, including SN74AS175BNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS175BNSR requirements.
6.How does Aetrix verify that SN74AS175BNSR is sourced from the original manufacturer or authorized distributors?
All SN74AS175BNSR 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 SN74AS175BNSR meets industry standards.
7.What is the process for return or replacement of SN74AS175BNSR?
All SN74AS175BNSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS175BNSR, 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 SN74AS175BNSR part is unused and in its original packaging.
Return procedure for SN74AS175BNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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