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Texas Instruments SN74ALS175DR
- Part No.:
- SN74ALS175DR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ALS175DR.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,925
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Product details
Overview
SN74ALS175DR from Texas Instruments is a quad D-type positive-edge-triggered flip-flop with complementary (Q and Q̅) outputs, direct-clear (CLR) input, and buffered clock. It operates at 5 V, supports 50 MHz maximum clock frequency, delivers ±8 mA output drive, and features 15 ns setup time and 0 ns hold time. It is used in synchronous digital logic circuits such as buffer registers and pattern generators in industrial control and legacy computing systems.
For engineers reviewing the SN74ALS175DR datasheet, SN74ALS175DR pinout, SN74ALS175DR application, or SN74ALS175DR equivalent, key selection criteria include its TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V), double-rail output capability, SOIC-16 package footprint, and guaranteed operation across 0°C to 70°C ambient temperature.
Technical Context
This device implements four independent D-type latches using bipolar ALS (Advanced Low-Power Schottky) TTL circuitry. Each flip-flop samples data on the rising edge of CLK and transfers it to Q/Q̅ outputs only when CLR is high; asserting CLR forces both outputs low regardless of clock or data state.
It features fully buffered inputs and outputs for noise immunity, no internal connection (NC) pins at positions 3 and 12, and is designed for direct interfacing with standard TTL families without level-shifting. Its propagation delays (tPLH/tPHL ≤ 15 ns) and pulse-width requirements (CLK high/low ≥ 10 ns) are specified under CL = 50 pF load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS TTL - ensures compatibility with legacy 74-series TTL systems and predictable DC noise margins |
| Flip-Flop Count | 4 independent channels - enables compact implementation of 4-bit storage or shift register stages |
| Output Type | Complementary (Q and Q̅) - eliminates need for external inverters in differential logic paths |
| Max Clock Frequency | 50 MHz - supports high-speed synchronous logic in mid-1980s–2000s digital designs |
| Supply Voltage | 4.5 V to 5.5 V - tolerates typical TTL rail variation; not rated for 3.3 V operation |
| Output Drive | IOL = 8 mA, IOH = –0.4 mA - sufficient to drive 10 standard TTL loads directly |
| Setup/Hold Time | tsu = 10 ns, th = 0 ns - simplifies timing closure in non-critical synchronous paths |
Pinout & Package
SN74ALS175DR is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package, 3.9 mm wide, with 1.27 mm pitch and RoHS-compliant NiPdAu lead finish. Pin 1 is located at the top-left corner (quadrant Q1) per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Active-low asynchronous reset - forces all Q outputs low immediately, overriding clock and data |
| 2 | 1D | Data input for first flip-flop - sampled on next CLK↑ edge if CLR is high |
| 3 | NC | No internal connection - must be left unconnected or tied to GND/VCC per layout best practice |
| 4 | 1Q | True output of first flip-flop - reflects stored D value after CLK↑ |
| 5 | 2D | Data input for second flip-flop |
| 6 | 2Q | True output of second flip-flop |
| 7 | 3D | Data input for third flip-flop |
| 8 | 3Q | True output of third flip-flop |
| 9 | 4Q | Complement output of fourth flip-flop - paired with pin 10 (4Q) |
| 10 | 4Q | True output of fourth flip-flop |
| 11 | 4D | Data input for fourth flip-flop |
| 12 | NC | No internal connection |
| 13 | GND | Ground reference - must be connected to system 0 V plane with low-inductance path |
| 14 | VCC | Positive supply - requires local 0.1 µF ceramic decoupling capacitor |
| 15 | CLK | Buffered clock input - triggers all four flip-flops simultaneously on rising edge |
| 16 | 1Q | Complement output of first flip-flop - matches pin 4 (1Q) polarity inversion |
Key Features
| Feature | Design Value |
|---|---|
| Double-rail outputs per stage | Provides true and complement outputs without external inverters - reduces component count in bus drivers and state machines |
| Direct-clear (CLR) input | Asynchronous reset active at any time - enables deterministic initialization before clocking begins |
| Buffered clock and data inputs | Minimizes capacitive loading effects and improves noise rejection on critical timing signals |
| TTL-compatible voltage thresholds | VIH = 2 V, VIL = 0.8 V - ensures reliable interfacing with standard 74LS/74F/74ALS logic families |
| SOIC-16 packaging | Surface-mount footprint compatible with automated assembly and reflow processes - supports high-density PCB layouts |
Applications
| Buffer/Storage Registers | Shift Registers |
|---|---|
Use Scenario: Holding parallel data between processing stages in microcontroller peripheral interfaces or data acquisition subsystems. IC Role / Device Role / Timing Role: Quad D-flip-flop acting as a 4-bit latch synchronized to system clock edges. Use Value: Eliminates metastability risk during data handoff by enforcing strict setup/hold timing and providing glitch-free output transitions. | Use Scenario: Implementing serial-to-parallel conversion in communication controllers or LED display drivers. IC Role / Device Role / Timing Role: Cascaded stage in a 4-bit shift register, where Q outputs feed D inputs of adjacent devices. Use Value: Complementary outputs simplify feedback logic for ring counters or Johnson counters without added gates. |
| Pattern Generators | Industrial Control Logic |
Use Scenario: Generating fixed test sequences for digital signal verification or hardware diagnostics. IC Role / Device Role / Timing Role: State element in a finite-state machine that cycles through predefined output combinations. Use Value: Direct-clear allows immediate reset to known initial state (e.g., all zeros), enabling repeatable test vector execution. | Use Scenario: Synchronizing sensor inputs or actuator commands in programmable logic controllers (PLCs) and motor drives. IC Role / Device Role / Timing Role: Input synchronizer that aligns asynchronous external signals to the internal clock domain. Use Value: Buffered inputs reject EMI-induced glitches common in factory-floor environments, improving system reliability. |
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 | Same logic function and electrical specs, but in 16-pin PDIP package with through-hole mounting | Suitable for prototyping, breadboarding, or legacy through-hole production lines | Select SN74ALS175N when manual assembly or socket-based testing is required |
| SN74AS175BD | Faster propagation delay (≤10 ns vs. ≤15 ns) and higher drive (IOL = 20 mA), but consumes more power (ICC ≈ 34 mA vs. 14 mA) | Better suited for high-speed timing-critical paths where ALS speed is insufficient | Choose SN74AS175BD only when 100 MHz clock support and stronger fanout are mandatory |
Compared with SN74ALS175N and SN74AS175BD, the SN74ALS175DR offers optimal balance of speed, power efficiency, and surface-mount manufacturability for cost-sensitive industrial and embedded applications requiring proven TTL compatibility.
Availability
SN74ALS175DR is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment repair, and embedded instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS175DR 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 U.S.-based semiconductor company founded in 1930, specializing in analog and embedded processing technologies with broad industrial, automotive, and aerospace product portfolios.
The SN74ALS175DR 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 were prioritized over raw speed.
FAQ
What is the operating temperature range for SN74ALS175DR?
The SN74ALS175DR is rated for commercial operation from 0°C to +70°C ambient temperature. This range is defined in the recommended operating conditions table of the SDAS207E datasheet and applies to all SOIC-packaged 74ALS175 variants including SN74ALS175DR. Operation outside this range may result in undefined timing or logic behavior.
Does SN74ALS175DR support 3.3 V logic levels?
No, SN74ALS175DR does not support 3.3 V logic levels. It requires a nominal 5 V supply (4.5 V to 5.5 V) and defines VIH = 2 V and VIL = 0.8 V - thresholds aligned with 5 V TTL, not 3.3 V CMOS. Interfacing with 3.3 V systems requires level translation, as direct connection risks incorrect logic interpretation or excessive input current.
How many flip-flops are integrated in SN74ALS175DR, and what outputs do they provide?
The SN74ALS175DR integrates four independent D-type flip-flops. Each provides complementary outputs (Q and Q̅), resulting in eight total output terminals (pins 4, 6, 8, 10, 16, 15, 14, and 13 are not all outputs - see pinout). Specifically, pins 4/16 = 1Q/1Q̅, pins 6/15 = 2Q/2Q̅, pins 8/14 = 3Q/3Q̅, and pins 10/9 = 4Q/4Q̅.
Can unused inputs on SN74ALS175DR be left floating?
No, unused inputs on SN74ALS175DR must not be left floating. Per TI application report SCBA004, all unused inputs - including CLK, D, and CLR - must be tied to either VCC or GND to prevent oscillation, increased power consumption, or erratic output behavior caused by TTL input sensitivity to noise and slow edge rates.
Is SN74ALS175DR pin-compatible with SN74AS175BD?
Yes, SN74ALS175DR and SN74AS175BD share identical SOIC-16 pinouts, including matching assignments for CLR, CLK, D inputs, Q/Q̅ outputs, VCC, and GND. However, they differ electrically: SN74AS175BD operates faster (100 MHz max) and draws more current, so direct substitution requires validation of timing margins and power delivery in the target design.
SN74ALS175DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74ALS175DR FAQ
1.How can I place an order for SN74ALS175DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS175DR 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 SN74ALS175DR reliable?
The price and inventory of SN74ALS175DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS175DR is usually 5 days.
3.What payment methods are accepted for SN74ALS175DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS175DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS175DR?
SN74ALS175DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS175DR 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 SN74ALS175DR?
For technical support, including SN74ALS175DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS175DR requirements.
6.How does Aetrix verify that SN74ALS175DR is sourced from the original manufacturer or authorized distributors?
All SN74ALS175DR 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 SN74ALS175DR meets industry standards.
7.What is the process for return or replacement of SN74ALS175DR?
All SN74ALS175DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS175DR, 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 SN74ALS175DR part is unused and in its original packaging.
Return procedure for SN74ALS175DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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