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Texas Instruments CD74HCT175EE4
- Part No.:
- CD74HCT175EE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HCT175EE4.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,215
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Product details
Overview
CD74HCT175EE4 from Texas Instruments is a high-speed CMOS quad D-type flip-flop with asynchronous master reset, operating at 4.5V–5.5V, delivering 50ns max propagation delay (CL = 50pF), complementary Q/Q̅ outputs per stage, and guaranteed operation from –55°C to +125°C. It serves as a synchronous data latch in digital control logic, state machines, and register files within industrial PLCs and test equipment.
For engineers reviewing the CD74HCT175EE4 datasheet, CD74HCT175EE4 pinout, CD74HCT175EE4 application, or CD74HCT175EE4 equivalent, key selection criteria include LSTTL-compatible input thresholds (VIH ≥ 2V, VIL ≤ 0.8V), common clock/reset architecture, fanout of 10 LSTTL loads, and PDIP-16 packaging for through-hole prototyping and legacy board replacement.
Technical Context
This device implements four edge-triggered D-type flip-flops sharing one clock (CP) and one active-low asynchronous master reset (MR). Data at each Dn input transfers to corresponding Qn and Q̅n outputs on the rising edge of CP; MR forces all Qn = 0 and Q̅n = 1 independently of CP timing.
It uses silicon-gate CMOS technology with TTL-compatible input circuitry, enabling direct interface with 5V LSTTL logic without level shifters. Input leakage remains ≤ ±1 µA across temperature, and output drive capability supports standard CMOS and TTL loads under full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - Ensures compatibility with standard 5V TTL/LSTTL systems and stable operation under rail variation. |
| Propagation Delay (CP→Q) | 50 ns max (CL = 50pF, TA = –55°C to +125°C) - Enables reliable operation up to 16 MHz in worst-case industrial environments. |
| Input Thresholds | VIH ≥ 2.0V, VIL ≤ 0.8V - Guarantees noise-immune interfacing with legacy 5V TTL families without external biasing. |
| Fanout Capability | 10 LSTTL loads - Supports direct driving of multiple downstream TTL inputs without buffer amplification. |
| Operating Temperature | –55°C to +125°C - Qualified for aerospace, military, and harsh-environment industrial control applications. |
| Output Drive | ±4 mA (VOH/VOL @ VCC = 4.5V, IO = ±4 mA) - Sufficient for driving PCB traces and moderate capacitive loads in dense logic designs. |
| Power Dissipation | CPD = 67 pF - Enables accurate dynamic power estimation (PD = VCC² × fi × CPD) for thermal design in sealed enclosures. |
Pinout & Package
CD74HCT175EE4 is housed in a 16-pin plastic dual in-line package (PDIP), with 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner when the notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Master Reset (active low) | Asynchronously clears all four Q outputs to logic 0; overrides clock and holds Q̅ high regardless of CP state. |
| 2 (Q0) | Complementary Output 0 | Inverted latched value of D0; used for feedback paths, toggle configurations, or differential signaling pairs. |
| 3 (Q0) | True Output 0 | Latched value of D0 on rising CP edge; primary data output for register chaining or bus loading. |
| 4 (D0) | Data Input 0 | Sampled on rising CP edge; must be stable for ≥20 ns before and ≥5 ns after CP transition (tSU/tH). |
| 5 (D1) | Data Input 1 | Independent data path synchronized to same CP/MR; enables parallel 4-bit storage without inter-stage dependency. |
| 6 (Q1) | True Output 1 | Matches Q0 timing and drive strength; allows simultaneous readout of multi-bit state with matched skew. |
| 7 (Q1) | Complementary Output 1 | Provides inverted copy of Q1 for XOR-based counters or enable logic requiring both polarities. |
| 8 (GND) | Ground Reference | Return path for all internal logic and output currents; requires low-impedance connection to minimize ground bounce. |
| 9 (Q3) | True Output 3 | Final stage output; commonly used as MSB in 4-bit registers or feedback into control logic loops. |
| 10 (Q3) | Complementary Output 3 | Enables dual-rail sampling or differential clock enable generation without external inverters. |
| 11 (D3) | Data Input 3 | Accepts parallel load data; timing identical to D0–D2, supporting synchronous 4-bit write operations. |
| 12 (D2) | Data Input 2 | Mid-register input; maintains consistent setup/hold margins across all four stages for deterministic timing closure. |
| 13 (Q2) | True Output 2 | Intermediate register output; often routed to status indicators or interrupt condition logic in embedded sequencers. |
| 14 (Q2) | Complementary Output 2 | Supports active-low enable signals or complements Q2 for arithmetic overflow detection circuits. |
| 15 (CP) | Common Clock Input | Rising-edge sensitive; all four flip-flops update simultaneously, ensuring zero inter-stage skew in synchronous designs. |
| 16 (VCC) | Positive Supply | Must be decoupled locally with 0.1 µF ceramic capacitor; voltage ripple < 100 mV peak-to-peak ensures timing margin integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Master Reset | Single MR pin clears all Q outputs to 0 regardless of clock phase - critical for system initialization and fault recovery. |
| Complementary Outputs per Stage | Each flip-flop provides true (Qn) and inverted (Q̅n) outputs - eliminates need for external inverters in toggle, counter, or enable logic. |
| LSTTL-Compatible Inputs | VIH ≥ 2.0V and VIL ≤ 0.8V at VCC = 4.5V–5.5V - enables direct connection to 74LS/74ALS families without level-shifting components. |
| High Noise Immunity | NIL/NIL = 30% of VCC - suppresses false triggering from EMI or crosstalk in noisy industrial cabinet environments. |
| Wide Temperature Range | Specified from –55°C to +125°C - supports deployment in avionics, downhole tools, and engine-control modules without derating. |
| Low Dynamic Power | CPD = 67 pF - reduces switching current vs. bipolar TTL, lowering heat generation in densely packed logic arrays. |
Applications
| Industrial Control Sequencing | Test Equipment Pattern Generation |
|---|---|
|
Use Scenario: Storing and advancing step sequences in programmable logic controllers managing conveyor belt motion profiles. IC Role / Device Role / Timing Role: Quad D-type flip-flop acting as a 4-bit synchronous register that captures sensor-triggered commands and clocks them into actuator control lines. Use Value: Common clock/reset simplifies timing coordination across four independent control bits; complementary outputs drive both solenoid ON/OFF and indicator LEDs from single stage. |
Use Scenario: Generating deterministic stimulus patterns for IC functional testing using automated test equipment (ATE) platforms. IC Role / Device Role / Timing Role: Edge-triggered data latch synchronizing pattern vectors from microcontroller GPIO to high-speed digital I/O channels. Use Value: 50 ns max propagation delay ensures sub-20 MHz pattern rates meet ATE timing windows; PDIP-16 facilitates socket-based board-level reconfiguration. |
| Legacy System Register Replacement | Avionics Status Monitoring |
|
Use Scenario: Upgrading obsolete 74LS175-based register banks in field-deployed instrumentation without PCB redesign. IC Role / Device Role / Timing Role: Pin-compatible CMOS replacement providing identical functionality with lower power and wider temperature margin. Use Value: Direct LSTTL input compatibility eliminates need for pull-up resistors or interface buffers; same 16-pin PDIP footprint allows drop-in replacement. |
Use Scenario: Capturing and holding real-time health-monitoring signals (voltage, temp, pressure) in airborne flight management units. IC Role / Device Role / Timing Role: Radiation-tolerant (per CD54HCT175 heritage) data latch capturing analog-to-digital converter outputs for periodic telemetry upload. Use Value: –55°C to +125°C rating meets DO-160 environmental requirements; asynchronous MR enables rapid system-wide reset during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad D-type flip-flop with reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT175N | Same HCT logic family, identical pinout and AC/DC specs; TI's current-production catalog version with updated process and RoHS compliance. | Preferred for new designs requiring long-term availability and TI's latest quality assurance protocols. | Select SN74HCT175N for new designs where lifecycle support and modern manufacturing traceability are required. |
| CD74HC175EE4 | HC variant: 2V–6V supply, VIH/VIL referenced to VCC (not fixed TTL thresholds); higher propagation delay (265 ns max at 2V). | Suitable for mixed-voltage systems or battery-powered logic where 5V-only operation is not mandatory. | Choose CD74HC175EE4 only when supply flexibility or ultra-low static current (<1 µA) outweighs need for TTL compatibility. |
Compared with CD74HCT175EE4, SN74HCT175N offers identical functionality with enhanced long-term supply assurance, while CD74HC175EE4 trades TTL compatibility for wider voltage range and higher delay - making the former ideal for new 5V industrial designs and the latter for multi-rail or low-power legacy upgrades.
Availability
CD74HCT175EE4 is available at Aetrix Electronics and suitable for industrial control sequencing, test equipment pattern generation, and legacy system register replacement requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT175EE4 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 experience in high-reliability industrial and aerospace components.
CD74HCT175EE4 belongs to TI's legacy High-Speed CMOS Logic (HCT) product line, designed specifically for seamless migration from bipolar TTL systems while delivering CMOS power efficiency and robustness.
FAQ
What is the maximum clock frequency supported by CD74HCT175EE4 across its full temperature range?
The CD74HCT175EE4 supports a maximum clock frequency of 16 MHz over the full –55°C to +125°C operating range, as verified by worst-case propagation delay (50 ns max CP→Q) and setup/hold timing constraints. This rating applies under CL = 50 pF load and VCC = 4.5V–5.5V, making CD74HCT175EE4 suitable for deterministic real-time control loops in industrial automation hardware.
Does CD74HCT175EE4 require external pull-up resistors on its inputs when interfacing with open-collector TTL devices?
No, CD74HCT175EE4 does not require external pull-up resistors on its inputs when interfacing with open-collector TTL devices because its HCT inputs are fully compatible with standard TTL voltage thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V at VCC = 5V). The internal input structure actively interprets TTL logic levels without external biasing, preserving signal integrity and reducing BOM count in CD74HCT175EE4-based designs.
Can CD74HCT175EE4 be used in place of a 74LS175 in an existing design without modifications?
Yes, CD74HCT175EE4 is a direct functional and pinout replacement for 74LS175 in 5V systems, offering identical 16-pin PDIP packaging, matching truth table behavior, and LSTTL-compatible input thresholds. Its lower power consumption, improved noise immunity, and extended temperature range make CD74HCT175EE4 a validated upgrade path for legacy 74LS175 deployments without layout or firmware changes.
What is the purpose of the complementary Q and Q̅ outputs on each flip-flop stage of CD74HCT175EE4?
The complementary Q and Q̅ outputs on each stage of CD74HCT175EE4 provide both true and inverted latched data simultaneously, eliminating the need for external inverters in applications such as toggle-mode counters, set-reset latches, or differential bus drivers. This feature reduces component count, improves timing alignment between related signals, and enhances reliability in CD74HCT175EE4-based synchronous logic designs.
How does the asynchronous master reset (MR) function behave relative to the clock input in CD74HCT175EE4?
In CD74HCT175EE4, the asynchronous master reset (MR) operates independently of the clock (CP) signal: asserting MR low immediately forces all four Q outputs to logic 0 and all four Q̅ outputs to logic 1, regardless of CP state or timing. This behavior enables deterministic system initialization, emergency shutdown, and fault recovery without waiting for a clock edge - a critical capability in safety-critical CD74HCT175EE4 implementations.
CD74HCT175EE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 25 MHz
- Max Propagation Delay @ V, Max CL:
- 33ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74HCT175EE4 FAQ
1.How can I place an order for CD74HCT175EE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT175EE4 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 CD74HCT175EE4 reliable?
The price and inventory of CD74HCT175EE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT175EE4 is usually 5 days.
3.What payment methods are accepted for CD74HCT175EE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT175EE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT175EE4?
CD74HCT175EE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT175EE4 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 CD74HCT175EE4?
For technical support, including CD74HCT175EE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT175EE4 requirements.
6.How does Aetrix verify that CD74HCT175EE4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT175EE4 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 CD74HCT175EE4 meets industry standards.
7.What is the process for return or replacement of CD74HCT175EE4?
All CD74HCT175EE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT175EE4, 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 CD74HCT175EE4 part is unused and in its original packaging.
Return procedure for CD74HCT175EE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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