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Texas Instruments SN74HC74DRG4
- Part No.:
- SN74HC74DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HC74DRG4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,988
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Product details
Overview
SN74HC74DRG4 from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with independent asynchronous preset and clear inputs per channel, operating from 2 V to 6 V supply voltage, supporting clock frequencies up to 36 MHz at 6 V, and rated for -40°C to +85°C industrial temperature range - used in digital logic control, clock division, and switch debouncing circuits.
For engineers reviewing the SN74HC74DRG4 datasheet, SN74HC74DRG4 pinout, SN74HC74DRG4 application, or SN74HC74DRG4 equivalent, key selection criteria include its dual-channel edge-triggered behavior, asynchronous set/reset capability, CMOS-compatible input/output drive strength, propagation delay of 15–49 ns (VCC = 6 V), and SOIC-14 package compatibility with standard PCB layouts.
Technical Context
The SN74HC74DRG4 implements two fully independent D-type latches synchronized to the rising edge of CLK, each with dedicated active-low PRE and CLR pins enabling immediate state override without clock dependency. Its balanced CMOS push-pull outputs source/sink up to ±4 mA (VCC = 4.5 V) and support fanout of 10 LSTTL loads.
Input structure uses standard high-impedance CMOS with ≤10 pF input capacitance and ±1 µA leakage at 6 V; timing parameters are strictly defined across 2–6 V supply and full temperature range, including setup time as low as 4 ns (VCC = 6 V) and minimum pulse width of 14 ns for CLK and control inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (74HC), compatible with TTL input thresholds and offering lower power than LSTTL |
| Supply Voltage Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V systems without level translation |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
| Max Clock Frequency | 36 MHz at VCC = 6 V - supports high-speed data sampling and clock division in timing-critical logic |
| Propagation Delay | 15 ns (CLK→Q, VCC = 6 V) - ensures predictable timing margins in synchronous state machines |
| Output Drive | ±4 mA (VOH/VOL @ VCC = 4.5 V) - sufficient to drive multiple CMOS inputs or small capacitive loads directly |
| Input Capacitance | ≤10 pF - minimizes loading on upstream drivers and preserves signal integrity in high-frequency routing |
Pinout & Package
SN74HC74DRG4 is housed in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm with standard 1.27 mm pitch. Pin functions are validated per TI SCLS094F Rev F (June 2021).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous Clear Input | Active-low reset for Channel 1/2; forces Q = LOW, Q = HIGH independent of clock |
| 1PRE, 2PRE | Asynchronous Preset Input | Active-low set for Channel 1/2; forces Q = HIGH, Q = LOW independent of clock |
| 1D, 2D | Data Input | Loads value into flip-flop on next positive CLK edge; held stable during setup/hold windows |
| 1CLK, 2CLK | Clock Input | Rising-edge sensitive trigger; initiates sampling of D and updating of Q/Q outputs |
| 1Q, 2Q | True Output | Complementary registered output; toggles only on valid CLK edges when PRE/CLR inactive |
| 1Q, 2Q | Inverted Output | Logic complement of Q; provides both polarities for feedback or differential signaling |
| VCC, GND | Power Supply | Single-supply operation; requires local 0.1 µF bypass capacitor at VCC pin per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent channels | Enables compact implementation of two separate synchronous storage elements in one IC - reduces board space vs discrete solutions |
| Asynchronous preset/clear | Allows deterministic initialization or emergency reset without waiting for clock edge - critical for power-on sequencing and fault recovery |
| Buffered inputs | Improves noise immunity and reduces sensitivity to slow-rising signals - eliminates need for external Schmitt triggers in many applications |
| Low dynamic power consumption | ICC ≤ 40 µA at 6 V (TA = 85°C) - extends battery life in portable logic and reduces thermal load in dense PCB layouts |
| Wide voltage operation | Functional across 2–6 V - supports mixed-voltage system integration and brown-out tolerant designs |
Applications
| Toggle Switch Emulation | Clock Division |
|---|---|
Use Scenario: Replacing mechanical toggle switches with momentary push buttons in user interfaces, power controls, or configuration settings. IC Role / Device Role / Timing Role: SN74HC74DRG4 acts as a synchronous toggle latch: D tied to Q, CLK driven by debounced button signal, PRE/CLR used for power-on reset. Use Value: Eliminates mechanical wear, reduces BOM cost and board area, and enables reliable single-pole switching in space-constrained devices. | Use Scenario: Generating sub-harmonic clocks for microcontroller peripherals, LED dimming, or sensor sampling synchronization. IC Role / Device Role / Timing Role: SN74HC74DRG4 configured as a divide-by-2 counter: Q fed back to D, CLK receives master clock, Q delivers half-frequency square wave. Use Value: Provides precise 50% duty-cycle output with zero additional components - avoids jitter and phase drift inherent in RC-based dividers. |
| State Machine Control | Glitch-Free Signal Synchronization |
Use Scenario: Implementing finite-state logic in industrial controllers, protocol translators, or test equipment sequencers. IC Role / Device Role / Timing Role: SN74HC74DRG4 stores current state bits; PRE/CLR manage mode entry/exit; CLK aligns transitions to system timing reference. Use Value: Ensures metastability-free state transitions and deterministic behavior under varying load conditions - critical for safety-related logic. | Use Scenario: Synchronizing asynchronous control signals (e.g., interrupt requests, reset pulses) across clock domains in multi-clock SoCs or FPGA interfaces. IC Role / Device Role / Timing Role: SN74HC74DRG4 used as a two-stage synchronizer: first stage captures async signal, second stage removes metastability before feeding downstream logic. Use Value: Reduces probability of metastable failure to <1e-9 per cycle using proven dual-flop technique - meets IEC 61508 SIL-2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC74HC74ADTR2G | Identical logic function and pinout; rated for -55°C to +125°C extended temperature range; slightly higher ICC (max 100 µA) | Suitable for automotive under-hood or military environments where extended temp is mandatory | Select MC74HC74ADTR2G only if operating beyond -40°C to +85°C is required; otherwise SN74HC74DRG4 offers better cost and availability for industrial use |
| 74AHC74PW,118 | Faster propagation delay (2.5 ns typical at 5 V); higher drive strength (±8 mA); narrower supply range (2–5.5 V) | Better suited for high-speed FPGA glue logic or low-voltage portable systems needing minimal skew | Choose 74AHC74PW,118 when >25 MHz operation or tighter timing budgets exist; SN74HC74DRG4 remains optimal for general-purpose 5 V/3.3 V logic interfacing |
Compared with MC74HC74ADTR2G and 74AHC74PW,118, the SN74HC74DRG4 delivers best-in-class balance of industrial temperature compliance, wide supply flexibility (2–6 V), and proven reliability in cost-sensitive embedded systems - making it the default choice unless extended temp or ultra-high speed are primary requirements.
Availability
SN74HC74DRG4 is available at Aetrix Electronics and suitable for industrial control panels, consumer electronics power management, and test equipment requiring stable component supply over multi-year production cycles.
Supply support for SN74HC74DRG4 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The SN74HC74DRG4 belongs to TI's 74HC logic family, designed specifically for low-power, high-noise-immunity digital control in resource-constrained embedded systems - emphasizing robustness, wide voltage operation, and long-term manufacturability.
FAQ
What is the maximum clock frequency supported by SN74HC74DRG4?
The SN74HC74DRG4 supports a maximum clock frequency of 36 MHz when operated at VCC = 6 V and TA = 25°C, dropping to 29 MHz across the full -40°C to +85°C industrial temperature range. This specification is verified per TI SCLS094F Section 6.7 and applies to clean, monotonic clock edges meeting the specified input transition rate (≤400 ns rise/fall at 6 V). Exceeding this limit may result in setup/hold violations or metastability.
Does SN74HC74DRG4 require external pull-up or pull-down resistors on unused inputs?
Yes, all unused inputs on SN74HC74DRG4 must be terminated to either VCC or GND to prevent floating states that cause excessive current draw, oscillation, or undefined outputs. TI recommends 10-kΩ resistors for unused PRE, CLR, D, or CLK pins - connecting PRE/CLR to VCC (inactive high) and D/CLK to GND or VCC depending on desired default logic level. Leaving inputs unconnected violates absolute maximum ratings and risks device malfunction.
Can SN74HC74DRG4 drive LED indicators directly?
No, SN74HC74DRG4 should not drive LEDs directly. Its output drive capability is limited to ±4 mA at VCC = 4.5 V (per Section 6.5), insufficient for typical 2–20 mA LED forward currents. Attempting direct LED drive risks exceeding absolute maximum output current (±25 mA) and damaging the output stage. Use a discrete transistor or dedicated LED driver IC - such as the TLC59108 - to interface SN74HC74DRG4 outputs with LEDs safely.
Is SN74HC74DRG4 pin-compatible with older 74LS74 devices?
No, SN74HC74DRG4 is not pin-compatible with 74LS74 despite identical pin count and function mapping. Key differences include incompatible input voltage thresholds (TTL vs CMOS), different output drive characteristics (push-pull vs totem-pole), and absence of internal pull-downs on LS-series PRE/CLR pins. Substituting SN74HC74DRG4 for 74LS74 requires verification of signal levels, fanout, and timing margins - especially for legacy 5 V TTL systems.
What decoupling capacitor value is recommended for SN74HC74DRG4?
Texas Instruments specifies a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin of SN74HC74DRG4, with short, low-inductance traces to GND. This value is validated in Section 10 and Figure 11-1 of SCLS094F to suppress high-frequency supply noise generated during output switching. For systems with significant broadband noise, paralleling a 1 µF capacitor is acceptable - but the 0.1 µF unit must remain physically adjacent to the IC.
SN74HC74DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 60 MHz
- Max Propagation Delay @ V, Max CL:
- 30ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74HC74DRG4 FAQ
1.How can I place an order for SN74HC74DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC74DRG4 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 SN74HC74DRG4 reliable?
The price and inventory of SN74HC74DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC74DRG4 is usually 5 days.
3.What payment methods are accepted for SN74HC74DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC74DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC74DRG4?
SN74HC74DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC74DRG4 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 SN74HC74DRG4?
For technical support, including SN74HC74DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC74DRG4 requirements.
6.How does Aetrix verify that SN74HC74DRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC74DRG4 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 SN74HC74DRG4 meets industry standards.
7.What is the process for return or replacement of SN74HC74DRG4?
All SN74HC74DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC74DRG4, 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 SN74HC74DRG4 part is unused and in its original packaging.
Return procedure for SN74HC74DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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