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Texas Instruments SN74AS175BD
- Part No.:
- SN74AS175BD
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AS175BD.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,081
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Product details
Overview
SN74AS175BD 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 clock and output stages. It operates at 5 V, supports 100 MHz clock frequency, delivers ±2 mA high-level and 20 mA low-level output drive, and is housed in a 16-pin SOIC (D) package for industrial logic control and register applications.
For engineers reviewing the SN74AS175BD datasheet, SN74AS175BD pinout, SN74AS175BD application, or SN74AS175BD equivalent, key selection criteria include its double-rail output architecture, TTL-compatible 5-V operation, fast 3–10 ns propagation delays, and suitability for synchronous storage, shift registers, and pattern generation in noise-sensitive digital systems.
Technical Context
The SN74AS175BD implements four independent D-type latches triggered on the positive edge of CLK, with each stage featuring true and complement outputs (Q, Q̅). Its direct-clear (CLR) input asynchronously resets all four outputs to low (Q = L, Q̅ = H), independent of clock state.
All inputs and outputs are fully buffered using AS-series TTL circuitry, providing high noise immunity and driving capability. The device is compatible with standard TTL logic families and requires no external pull-ups or termination for typical 50-pF load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AS (Advanced Schottky TTL) - enables high-speed operation with low power-delay product |
| Flip-Flop Count & Type | Quad D-type with complementary outputs - supports simultaneous access to true and inverted data per stage |
| Max Clock Frequency | 100 MHz - allows use in high-throughput synchronous logic and pipeline register stages |
| Propagation Delay (tPLH/tPHL) | 3–10 ns (CLK to Q/Q̅) - ensures tight timing margins in fast-counting and state-machine designs |
| Output Drive | IOL = 20 mA, IOH = –2 mA - directly drives multiple TTL loads or small-signal MOSFET gates without buffers |
| Supply Voltage Range | 4.5 V to 5.5 V - maintains stable operation across standard 5-V rail tolerances |
| Operating Temperature | 0°C to 70°C - certified for commercial-grade embedded and industrial control environments |
Pinout & Package
SN74AS175BD is supplied in a 16-pin SOIC (D) package (JEDEC MS-012AC, 3.9 mm body width, 1.27 mm pitch), optimized for surface-mount assembly and thermal performance (θJA = 73°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear - forces all Q outputs low and Q̅ high regardless of CLK or D state |
| 2 | 1D | Data input for first flip-flop - sampled on rising CLK edge |
| 3 | 1Q | True output of first flip-flop |
| 4 | 1Q̅ | Inverted output of first flip-flop - enables differential signaling or logic inversion without external gate |
| 5 | 2D | Data input for second flip-flop |
| 6 | 2Q | True output of second flip-flop |
| 7 | 2Q̅ | Inverted output of second flip-flop |
| 8 | GND | Ground reference - must be low-impedance connection for noise suppression |
| 9 | 3Q̅ | Inverted output of third flip-flop |
| 10 | 3Q | True output of third flip-flop |
| 11 | 3D | Data input for third flip-flop |
| 12 | 4Q̅ | Inverted output of fourth flip-flop |
| 13 | 4Q | True output of fourth flip-flop |
| 14 | 4D | Data input for fourth flip-flop |
| 15 | CLK | Positive-edge-triggered clock - transitions above ~1.3 V initiate sampling of D inputs |
| 16 | VCC | +5 V supply - bypass capacitor (0.1 µF) required near pin for transient current stability |
Key Features
| Feature | Design Value |
|---|---|
| Complementary outputs per stage | Eliminates need for external inverters in toggle, enable, or differential bus applications |
| Fully buffered I/O | Provides high noise margin (>0.4 V) and consistent drive strength across voltage/temperature |
| Direct-clear (CLR) input | Enables system-wide reset without clock dependency - critical for deterministic startup and fault recovery |
| 100 MHz maximum clock rate | Supports real-time data capture and high-speed counter chains in instrumentation and comms interfaces |
| TTL-compatible interface | Interoperates seamlessly with legacy 74LS/74F logic and microcontroller GPIO without level-shifting |
Applications
| Buffer/Storage Register | Shift Register |
|---|---|
Use Scenario: Holding parallel data from an ADC or microcontroller port between processing cycles. IC Role / Device Role / Timing Role: Synchronous data latch with independent Q/Q̅ outputs for bus isolation and read/write arbitration. Use Value: Eliminates external inverters and reduces PCB footprint versus discrete DFF + inverter solutions. | Use Scenario: Serial-to-parallel conversion in UART receiver front-ends or LED matrix drivers. IC Role / Device Role / Timing Role: Cascaded quad-stage shift element with shared CLK/CLR for precise bit alignment. Use Value: Complementary outputs allow direct driving of bidirectional shift control logic without added gates. |
| Pattern Generator | Digital Test Equipment |
Use Scenario: Generating repeating test vectors (e.g., PRBS, walking 1s) for IC validation. IC Role / Device Role / Timing Role: State-holding element in feedback-shift configurations with XOR feedback paths. Use Value: Q/Q̅ pairs simplify XOR/XNOR logic implementation for linear feedback shift registers (LFSRs). | Use Scenario: Synchronizing asynchronous trigger signals and capturing event timestamps in logic analyzers. IC Role / Device Role / Timing Role: Input synchronizer and metastability-hardened latch for high-frequency signal acquisition. Use Value: 100 MHz rating and sub-10 ns delays ensure accurate sampling of fast digital edges under jitter. |
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 |
|---|---|---|---|
| SN74ALS175N | Lower speed (50 MHz max), higher propagation delay (15 ns), ALS-family lower power (~9 mA ICC) | Suitable for cost-sensitive, lower-frequency control logic where timing margin is generous | Select when power efficiency > speed; not drop-in due to timing and drive differences |
| SN74AS174N | Hex (6-stage) single-rail output version; no Q̅ outputs; same speed and drive specs | Better for pure storage/register use without need for inverted outputs | Choose when board space permits larger PDIP and inverted outputs are unnecessary |
Compared with SN74ALS175N and SN74AS174N, the SN74AS175BD offers superior timing performance and built-in complementary outputs-making it optimal for high-speed, noise-immune register design where dual-rail access reduces component count and improves signal integrity.
Availability
SN74AS175BD is available at Aetrix Electronics and suitable for industrial control systems, test equipment design, and digital instrumentation requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for SN74AS175BD 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 technologies with over 50 years of innovation in industrial and automotive electronics.
The SN74AS175BD belongs to TI's 74AS advanced Schottky TTL logic family, engineered for high-speed digital systems demanding reliable 5-V operation, robust noise immunity, and compatibility with legacy TTL infrastructure.
FAQ
What is the function of the CLR pin on the SN74AS175BD?
The CLR (clear) pin on the SN74AS175BD is an asynchronous active-low input that forces all four Q outputs low and all Q̅ outputs high, regardless of clock or data states. This provides immediate, clock-independent reset capability essential for system initialization and fault recovery. The SN74AS175BD's CLR functionality is electrically identical across all temperature and voltage operating conditions specified in its datasheet.
Does the SN74AS175BD require external pull-up resistors on its outputs?
No, the SN74AS175BD does not require external pull-up resistors on its outputs. Its totem-pole (push-pull) output structure actively drives both high and low logic levels, delivering up to 20 mA sink and 2 mA source current. External pull-ups would interfere with proper logic level definition and are unnecessary for standard TTL or CMOS interfacing within its specified VCC range.
Can the SN74AS175BD operate reliably at 5.5 V supply?
Yes, the SN74AS175BD is rated for continuous operation from 4.5 V to 5.5 V, with all electrical characteristics-including propagation delay, output drive, and noise margins-guaranteed across this full range. At 5.5 V, the device maintains its 100 MHz maximum clock frequency and meets all switching and DC specifications per the SDAS207E datasheet revision.
How many flip-flops does the SN74AS175BD contain, and what is their output configuration?
The SN74AS175BD contains four independent D-type flip-flops, each with complementary (true and inverted) outputs (Q and Q̅). This differs from hex variants like SN74AS174, which provide six single-rail outputs. The dual-rail configuration of the SN74AS175BD eliminates external inverters in applications requiring both logic polarities, such as bus transceivers and differential clock distribution.
Is the SN74AS175BD pin-compatible with SN74ALS175DR?
Yes, the SN74AS175BD and SN74ALS175DR share identical 16-pin SOIC (D) package dimensions, pinout, and terminal functions-including CLR, CLK, D, Q, Q̅, VCC, and GND assignments. However, they differ in speed (100 MHz vs. 50 MHz), drive strength, and propagation delay; thus, while physically interchangeable, timing-critical designs must verify setup/hold and clock-to-output margins when substituting.
SN74AS175BD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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-SOIC
SN74AS175BD FAQ
1.How can I place an order for SN74AS175BD through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS175BD 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 SN74AS175BD reliable?
The price and inventory of SN74AS175BD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS175BD is usually 5 days.
3.What payment methods are accepted for SN74AS175BD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS175BD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS175BD?
SN74AS175BD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS175BD 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 SN74AS175BD?
For technical support, including SN74AS175BD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS175BD requirements.
6.How does Aetrix verify that SN74AS175BD is sourced from the original manufacturer or authorized distributors?
All SN74AS175BD 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 SN74AS175BD meets industry standards.
7.What is the process for return or replacement of SN74AS175BD?
All SN74AS175BD units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS175BD, 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 SN74AS175BD part is unused and in its original packaging.
Return procedure for SN74AS175BD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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