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Texas Instruments SN74LS175NE4
- Part No.:
- SN74LS175NE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LS175NE4.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,721
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Product details
Overview
SN74LS175NE4 from Texas Instruments is a quadruple positive-edge-triggered D-type flip-flop with asynchronous master clear, implemented in TTL logic, packaged in a 16-pin PDIP (N) housing, operating over 0°C to 70°C, and featuring typical propagation delay of 15 ns at VCC = 5 V. It serves as a synchronous data latch in digital control logic, state register banks, and clocked memory buffers.
For engineers reviewing the SN74LS175NE4 datasheet, SN74LS175NE4 pinout, SN74LS175NE4 application, or SN74LS175NE4 equivalent, key selection considerations include its 16-pin PDIP mechanical compatibility, TTL-level input thresholds, guaranteed 4-bit parallel storage per clock edge, and compatibility with legacy 74LS-series bus timing and drive requirements.
Technical Context
The SN74LS175NE4 implements four independent D-type latches sharing a common clock and asynchronous clear, with each stage sampling D inputs on the rising edge of CLK and updating Q outputs synchronously. Its TTL-compatible inputs accept standard 74LS logic thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), and outputs drive ±8 mA loads at VOH ≥ 2.7 V and VOL ≤ 0.5 V.
It operates strictly within the 4.75–5.25 V supply range and exhibits no internal Schmitt-triggering, metastability hardening, or power-down modes-consistent with classic 74LS architecture. The device lacks output enable or three-state capability, requiring external bus isolation in shared-data-path designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS TTL - ensures interoperability with legacy 74LS/74S systems and predictable fanout loading |
| Function | Quadruple D-type flip-flop with asynchronous clear - provides four independent 1-bit storage elements controlled by one clock and one reset |
| Propagation Delay | 15 ns max (tPLH/tPHL) - defines maximum clock-to-output timing for synchronous state updates |
| Supply Voltage | 4.75 V to 5.25 V - requires regulated 5 V rail; operation outside this range invalidates timing and DC specs |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade environments only; not suitable for industrial or extended-temp applications |
| Output Drive | 8 mA sink / 0.4 mA source - supports direct connection to other 74LS inputs without pull-up resistors |
| Package | PDIP-16 (N) - through-hole mounting compatible with standard 0.3" DIP sockets and wave-solder processes |
Pinout & Package
SN74LS175NE4 is housed in a 16-pin plastic dual in-line package (PDIP-N), 0.3" wide, with 0.1" pin pitch and standard DIP footprint. Pin 1 is located at the top-left corner when viewed from the top with notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLK | Positive-edge-triggered clock input - all four flip-flops sample D inputs simultaneously on rising edge |
| 2 | 1D | Data input for first flip-flop - sampled at next active CLK edge and appears at 1Q after tpd |
| 3 | 1Q | True output of first flip-flop - non-inverting, active-high storage node |
| 4 | 2Q | True output of second flip-flop - electrically isolated but clock- and clear-synchronized with others |
| 5 | 2D | Data input for second flip-flop - shares same timing constraints and loading as 1D |
| 6 | 3D | Data input for third flip-flop - no internal inter-stage dependency; fully independent path |
| 7 | 3Q | True output of third flip-flop - maintains static logic state until next CLK edge or CLR assertion |
| 8 | GND | Ground reference - must be low-impedance connection to minimize switching noise coupling |
| 9 | 4Q | True output of fourth flip-flop - completes the 4-bit parallel register set |
| 10 | 4D | Data input for fourth flip-flop - routed separately; no internal fan-in from other D inputs |
| 11 | CLR̅ | Asynchronous active-low clear - forces all Q outputs low regardless of CLK state |
| 12 | 3Q̅ | Complement output of third flip-flop - provided for convenience; not required for basic operation |
| 13 | 2Q̅ | Complement output of second flip-flop - enables direct use in differential or inverted logic paths |
| 14 | 1Q̅ | Complement output of first flip-flop - eliminates need for external inverters in many decode applications |
| 15 | VCC | +5 V power supply - must be decoupled locally with 0.1 µF ceramic capacitor |
| 16 | 4Q̅ | Complement output of fourth flip-flop - completes full true/complement output set for all stages |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous master clear | Immediate, clock-independent reset of all four Q outputs to logic low - essential for system initialization and fault recovery |
| Positive-edge clock triggering | State update occurs only on rising CLK transition - eliminates ambiguity from slow or noisy clock edges |
| True and complement outputs per stage | Each flip-flop provides both Q and Q̅ - reduces external gate count in combinational feedback or decoding logic |
| TTL-compatible input thresholds | VIL ≤ 0.8 V and VIH ≥ 2.0 V - ensures reliable interfacing with 74LS, 74S, and microcontroller GPIOs driving 5 V logic |
| Guaranteed 4-bit synchronization | All four stages share identical propagation delays and setup/hold timing - critical for parallel data capture integrity |
Applications
| Parallel Data Latching | Digital Counter Control |
|---|---|
Use Scenario: Capturing 4-bit status signals from sensors or switches synchronized to a system clock. IC Role / Device Role / Timing Role: SN74LS175NE4 acts as a clocked input register, holding stable values during processing cycles and updating only on defined clock edges. Use Value: Prevents metastability and glitches in downstream logic by eliminating asynchronous signal sampling. | Use Scenario: Managing carry and reset signals in cascaded 4-bit binary counters. IC Role / Device Role / Timing Role: SN74LS175NE4 stores intermediate counter states and enables synchronous load or reset under controller command. Use Value: Ensures deterministic counter behavior across clock domains and eliminates race conditions in multi-stage counting. |
| State Machine Registers | Legacy Bus Interface Buffering |
Use Scenario: Implementing finite-state machine registers in industrial PLC modules using discrete TTL logic. IC Role / Device Role / Timing Role: SN74LS175NE4 holds current state bits and updates them on each state-transition clock pulse. Use Value: Provides predictable, cycle-accurate state retention without software overhead or microcontroller dependency. | Use Scenario: Isolating and synchronizing address/data strobes between legacy 8-bit microprocessors and peripheral devices. IC Role / Device Role / Timing Role: SN74LS175NE4 buffers control lines such as ALE, RD̅, or WR̅ to meet timing margins and reduce bus loading. Use Value: Maintains signal integrity and timing compliance in mixed-generation digital systems with varying drive strengths. |
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 |
|---|---|---|---|
| SN74LS175N | Identical electrical and functional specification; differs only in packaging marking convention (no E4 suffix) | No functional difference - both are PDIP-16, commercial temperature, RoHS-compliant 74LS devices | Select SN74LS175N if sourcing from distributors listing that variant; SN74LS175NE4 is TI's standardized orderable part number with E4 marking |
| SN74LS174N | Hex D-type flip-flop (6-bit) with common clock and clear - differs in bit count and pinout; no Q̅ outputs | Suitable where higher bit density is needed and complement outputs are unnecessary; not drop-in replaceable | Choose SN74LS174N only when expanding register width beyond 4 bits and accepting loss of Q̅ signals per stage |
Compared with SN74LS175N, SN74LS175NE4 offers identical performance and form factor but reflects TI's updated packaging and traceability standards; versus SN74LS174N, it trades two extra bits for guaranteed Q/Q̅ pairs per stage-critical for applications requiring both polarities without added gates.
Availability
SN74LS175NE4 is available at Aetrix Electronics and suitable for industrial control panels, legacy instrumentation upgrades, and educational electronics labs requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS175NE4 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 ICs, embedded processors, and logic families with broad industrial and automotive reach.
SN74LS175NE4 belongs to the 74LS TTL logic family, designed specifically for robust, low-power, medium-speed digital control in cost-sensitive commercial systems where compatibility with decades-old designs remains essential.
FAQ
What is the maximum clock frequency supported by SN74LS175NE4?
The SN74LS175NE4 does not specify a maximum clock frequency in its datasheet; instead, timing is governed by minimum pulse widths and setup/hold requirements. With a typical propagation delay of 15 ns and minimum clock pulse width of 20 ns, practical operation is limited to approximately 25 MHz in well-designed layouts - though most legacy applications run below 10 MHz for margin.
Does SN74LS175NE4 support three-state outputs?
No, SN74LS175NE4 does not include output enable or three-state functionality. All outputs are permanently active push-pull drivers. To share outputs on a bus, external tri-state buffers or open-collector wired-OR configurations must be used - SN74LS175NE4 itself cannot be directly connected to a bidirectional data bus.
Can SN74LS175NE4 be operated at 3.3 V?
No, SN74LS175NE4 requires a nominal 5 V supply (4.75–5.25 V range) and is not characterized for 3.3 V operation. At 3.3 V, input thresholds become unreliable, propagation delays increase significantly, and output drive falls outside specification - use 74LVC or 74AUP series for 3.3 V-compatible D-flip-flops.
What is the purpose of the Q̅ outputs on SN74LS175NE4?
The Q̅ outputs on SN74LS175NE4 provide logically inverted versions of each flip-flop's stored state, enabling direct implementation of complementary logic functions - such as NAND-based state decoding or differential signaling - without adding external inverters, thereby reducing component count and propagation delay in timing-critical paths.
Is SN74LS175NE4 pin-compatible with SN74LS174N?
No, SN74LS175NE4 is not pin-compatible with SN74LS174N. While both are 16-pin PDIP devices, their pinouts differ: SN74LS175NE4 assigns pins 12–16 to Q̅ outputs and CLR̅, whereas SN74LS174N uses those pins for additional D inputs and Q outputs. PCB layout and wiring must be redesigned for substitution.
SN74LS175NE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 1
- Number of Bits per Element:
- 4
- Clock Frequency:
- 40 MHz
- Max Propagation Delay @ V, Max CL:
- 25ns @ 5V, 15pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 400µA, 8mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Iq):
- 18 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74LS175NE4 FAQ
1.How can I place an order for SN74LS175NE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS175NE4 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 SN74LS175NE4 reliable?
The price and inventory of SN74LS175NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS175NE4 is usually 5 days.
3.What payment methods are accepted for SN74LS175NE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS175NE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS175NE4?
SN74LS175NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS175NE4 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 SN74LS175NE4?
For technical support, including SN74LS175NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS175NE4 requirements.
6.How does Aetrix verify that SN74LS175NE4 is sourced from the original manufacturer or authorized distributors?
All SN74LS175NE4 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 SN74LS175NE4 meets industry standards.
7.What is the process for return or replacement of SN74LS175NE4?
All SN74LS175NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS175NE4, 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 SN74LS175NE4 part is unused and in its original packaging.
Return procedure for SN74LS175NE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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