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Texas Instruments SN74ALS175N
- Part No.:
- SN74ALS175N
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ALS175N.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:263
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Product details
Overview
SN74ALS175N from Texas Instruments is a quad D-type positive-edge-triggered flip-flop with individual complementary outputs (Q and Q̅) per stage, direct-clear (CLR) input, and buffered clock. It operates at 5 V, supports 50 MHz max clock frequency, delivers ±4 mA output drive, and is housed in a 16-pin PDIP package for legacy TTL-based register and shift-register applications.
For engineers reviewing the SN74ALS175N datasheet, SN74ALS175N pinout, SN74ALS175N application, or SN74ALS175N equivalent, this device is selected for synchronous data latching in industrial control logic, buffer/shift register design, and pattern generation where double-rail output availability and TTL compatibility are required.
Technical Context
The SN74ALS175N implements four independent D-type latches using bipolar ALS (Advanced Low-Power Schottky) TTL circuitry. Each stage features fully buffered CLK and CLR inputs, enabling clean edge-triggering and noise-immune asynchronous reset without external gating.
It provides true/complement outputs (Q/Q̅) on all four channels, eliminating need for external inverters in toggle or differential signaling paths. Setup time is 10 ns, hold time is 0 ns, and propagation delays range from 3 ns (tPLH) to 18 ns (tPHL) under standard load conditions (VCC = 4.5–5.5 V, CL = 50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) TTL - balances speed and power vs. standard TTL |
| Function | Quad D-type flip-flop with complementary outputs and asynchronous clear |
| Max Clock Frequency | 50 MHz - enables high-speed synchronous logic in legacy 74-series systems |
| Output Drive | IOL = 8 mA / IOH = –0.4 mA - sufficient to drive multiple TTL inputs directly |
| Supply Voltage | VCC = 4.5–5.5 V - compatible with standard 5 V TTL rails and tolerates nominal supply variation |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for non-military embedded and industrial equipment |
| Propagation Delay | tPLH/tPHL = 3–18 ns - ensures tight timing margins in multi-stage register chains |
Pinout & Package
SN74ALS175N is supplied in a 16-pin plastic dual in-line package (PDIP-N), 0.3-inch body width, with standard through-hole mounting and industry-compatible footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Active-low asynchronous clear input - resets all four Q outputs to low regardless of clock state |
| 2 | 1Q | True output of first flip-flop - used for primary data path or feedback |
| 3 | 1Q̅ | Complementary output of first flip-flop - enables differential signaling or inverted logic without external inverter |
| 4 | 1D | Data input for first flip-flop - sampled on rising edge of CLK |
| 5 | 2D | Data input for second flip-flop - independent of other stages |
| 6 | 2Q̅ | Complementary output of second flip-flop - matches pin 3 functionality for channel 2 |
| 7 | 2Q | True output of second flip-flop - aligned with pin 2 for consistent layout |
| 8 | GND | Ground reference - must be connected to system common for stable operation |
| 9 | 3Q | True output of third flip-flop - continues sequential output mapping |
| 10 | 3Q̅ | Complementary output of third flip-flop - maintains full Q/Q̅ pairing across all four stages |
| 11 | 3D | Data input for third flip-flop - completes first half of quad structure |
| 12 | 4D | Data input for fourth flip-flop - final data input in the group |
| 13 | 4Q̅ | Complementary output of fourth flip-flop - ensures symmetry with pins 3, 6, and 10 |
| 14 | 4Q | True output of fourth flip-flop - last output in sequence, aligns with pin 2/7/9 |
| 15 | CLK | Buffered clock input - triggers all four stages simultaneously on rising edge |
| 16 | VCC | +5 V supply - powers internal TTL circuitry; decoupling capacitor recommended near pin |
Key Features
| Feature | Design Value |
|---|---|
| Complementary outputs per stage | Eliminates need for external inverters in toggle, XOR, or differential bus applications |
| Buffered clock and clear inputs | Reduces fan-out loading and improves noise immunity versus unbuffered TTL variants |
| ALS technology | Delivers 50 MHz operation with ~9 mA typical ICC - 30% lower power than standard LS at same speed |
| Standard 16-pin PDIP footprint | Enables drop-in replacement in existing 74-series PCB layouts without redesign |
| TTL-compatible voltage thresholds | VIH = 2.0 V / VIL = 0.8 V - interoperable with 74LS, 74F, and earlier 74xx families |
Applications
| Industrial Control Registers | Serial-to-Parallel Shift Registers |
|---|---|
Use Scenario: Latching sensor status bits (e.g., limit switches, encoder states) into a microcontroller's parallel input port. IC Role / Device Role / Timing Role: Synchronous data capture element with simultaneous 4-bit storage on rising CLK edge; CLR used for system-wide reset. Use Value: Provides deterministic, glitch-free sampling of asynchronous industrial signals with hardware-level synchronization. | Use Scenario: Converting serial data streams from UART or SPI peripherals into parallel byte-wide format for display drivers or memory interfaces. IC Role / Device Role / Timing Role: Four-stage shift register building block; cascaded with additional SN74ALS175N units to achieve 8/12/16-bit conversion. Use Value: Enables compact, low-power serial-to-parallel conversion without FPGA or microcontroller overhead. |
| Pattern Generators | State Machine Controllers |
Use Scenario: Generating fixed test patterns (e.g., walking 1s, checkerboard) for digital circuit validation or LED matrix sequencing. IC Role / Device Role / Timing Role: Deterministic state sequencer; Q/Q̅ outputs drive combinational logic or discrete loads directly. Use Value: Delivers repeatable, jitter-free waveform generation with minimal external components due to built-in complement outputs. | Use Scenario: Implementing finite-state logic for motor sequencing, relay coordination, or protocol handshaking in standalone hardware. IC Role / Device Role / Timing Role: State register holding current machine state; CLK synchronized to system timing, CLR for error recovery. Use Value: Reduces firmware dependency by offloading critical real-time state transitions to deterministic hardware logic. |
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 |
|---|---|---|---|
| SN74ALS174N | Six single-rail outputs (no Q̅); identical ALS speed/power; same PDIP-16 package | Requires external inverters for complemented logic; better suited for pure storage registers without differential needs | Select when only true outputs are needed and board space allows added inversion logic |
| SN74AS175BN | Faster AS family: 100 MHz fmax, lower tPLH/tPHL (3–7.5 ns), higher ICC (~34 mA) | Higher speed enables tighter timing in advanced designs but increases power and noise sensitivity | Select when >50 MHz operation is required and thermal/power budget permits |
Compared with SN74ALS175N, SN74ALS174N offers more flip-flops but lacks complementary outputs, while SN74AS175BN doubles clock speed at the cost of 3.8× higher supply current - making SN74ALS175N optimal for balanced speed, power, and functional density in legacy TTL systems.
Availability
SN74ALS175N is available at Aetrix Electronics and suitable for industrial control registers, serial-to-parallel shift registers, pattern generators, and state machine controllers requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS175N 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.
The SN74ALS175N belongs to TI's legacy 74ALS logic family, designed specifically for high-reliability, medium-speed TTL-compatible digital systems where power efficiency and noise immunity are prioritized over maximum frequency.
FAQ
What is the function of the CLR pin on the SN74ALS175N?
The CLR (Clear) pin on the SN74ALS175N is an active-low asynchronous input that forces all four Q outputs to logic low and all Q̅ outputs to logic high, independently of the clock signal. This allows immediate, deterministic reset of the entire register without waiting for the next clock edge - a critical feature for system initialization and fault recovery in the SN74ALS175N.
Does the SN74ALS175N support 3.3 V operation?
No, the SN74ALS175N is specified only for 4.5 V to 5.5 V supply operation and is not 3.3 V tolerant. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and internal ALS TTL circuitry require a nominal 5 V rail. Using it with 3.3 V may result in undefined logic states or failure to meet timing specifications - always power the SN74ALS175N from a regulated 5 V source.
How many flip-flops does the SN74ALS175N contain, and what type are they?
The SN74ALS175N contains four independent D-type positive-edge-triggered flip-flops. Each stage has separate D input, CLK input, asynchronous CLR input, and complementary Q and Q̅ outputs - totaling eight output pins (four true, four complemented). This architecture makes the SN74ALS175N ideal for applications requiring both polarities of stored data without external inversion.
Can the SN74ALS175N be used in place of the SN74LS175?
Yes, the SN74ALS175N is a direct functional and pin-compatible upgrade to the SN74LS175, offering improved speed (50 MHz vs. 30 MHz), lower power consumption (~9 mA ICC vs. ~14 mA), and enhanced noise immunity due to buffered inputs. All pin functions, electrical characteristics, and timing parameters are backward-compatible - making the SN74ALS175N a seamless drop-in replacement in existing SN74LS175 designs.
What is the maximum clock frequency supported by the SN74ALS175N?
The SN74ALS175N supports a maximum clock frequency of 50 MHz under recommended operating conditions (VCC = 4.5–5.5 V, TA = 0°C to +70°C, CL = 50 pF). This value is guaranteed by characterization and reflects the highest rate at which reliable setup/hold and propagation timing can be maintained across all four flip-flop stages in the SN74ALS175N.
SN74ALS175N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 17ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 400µA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 14 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74ALS175N FAQ
1.How can I place an order for SN74ALS175N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS175N 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 SN74ALS175N reliable?
The price and inventory of SN74ALS175N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS175N is usually 5 days.
3.What payment methods are accepted for SN74ALS175N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS175N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS175N?
SN74ALS175N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS175N 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 SN74ALS175N?
For technical support, including SN74ALS175N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS175N requirements.
6.How does Aetrix verify that SN74ALS175N is sourced from the original manufacturer or authorized distributors?
All SN74ALS175N 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 SN74ALS175N meets industry standards.
7.What is the process for return or replacement of SN74ALS175N?
All SN74ALS175N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS175N, 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 SN74ALS175N part is unused and in its original packaging.
Return procedure for SN74ALS175N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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