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Texas Instruments CD74HCT74M
- Part No.:
- CD74HCT74M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT74M.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,091
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Product details
Overview
CD74HCT74M from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with independent asynchronous clear and preset inputs per channel, operating across 4.5 V to 5.5 V supply voltage, supporting clock frequencies up to 25 MHz at 25°C, and rated for –55°C to +125°C industrial/military temperature range - used in synchronous logic control, clock division, and momentary-to-toggle switch conversion.
For engineers reviewing the CD74HCT74M datasheet, CD74HCT74M pinout, CD74HCT74M application, or CD74HCT74M equivalent, key selection criteria include guaranteed 5-V TTL-compatible input thresholds, propagation delay ≤44 ns (CL = 50 pF), dual-channel independence, SOIC-14 package footprint, and full support for asynchronous reset/preset functionality in harsh-temperature environments.
Technical Context
The CD74HCT74M implements two electrically isolated D-type flip-flop cells, each triggered on the rising edge of its dedicated CLK input and controlled by separate active-low CLR and PRE signals. Its HCT logic family ensures TTL-level input compatibility while maintaining CMOS output drive strength and low static current.
Each channel features buffered inputs with defined VIH/VIL thresholds (2.0 V/0.8 V at VCC = 5 V), supports fanout of ≥10 LSTTL loads, and guarantees setup/hold times of 15 ns/3 ns respectively under recommended operating conditions - enabling reliable operation in mixed-logic systems and noise-prone industrial timing circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS outputs, enables direct interface with legacy 5-V TTL systems without level-shifting |
| Supply Voltage Range | 4.5 V to 5.5 V - tightly regulated 5-V operation only; not functional below 4.5 V or above 5.5 V |
| Max Clock Frequency | 25 MHz at TA = –40°C to +85°C - guaranteed minimum toggle rate per channel under commercial temperature conditions |
| Propagation Delay (tpd) | 44 ns max (CL = 50 pF) - determines maximum achievable system timing margin for synchronous state transitions |
| Input Thresholds (VIH/VIL) | 2.0 V / 0.8 V at VCC = 5 V - matches standard TTL logic levels, eliminating need for external translators |
| Operating Temperature | –55°C to +125°C - qualified for extended-temperature military, aerospace, and under-hood automotive applications |
| Output Drive (IOH/IOL) | –4 mA / +4 mA - sufficient to directly drive multiple LSTTL inputs or small capacitive loads without buffering |
Pinout & Package
CD74HCT74M is housed in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm with standard 1.27-mm pitch, optimized for automated surface-mount assembly and thermal performance in high-reliability PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | Channel 1 & 2 Clear (Active Low) | Asynchronous reset: forces Q = LOW regardless of clock or data state; overrides all other inputs |
| 2, 12 | Channel 1 & 2 Data (D) | Stores applied logic level on next rising clock edge; defines next-state output value |
| 3, 11 | Channel 1 & 2 Clock (CLK) | Rising-edge sensitive trigger: samples D input and updates Q/Q outputs synchronously |
| 4, 10 | Channel 1 & 2 Preset (Active Low) | Asynchronous set: forces Q = HIGH regardless of clock or data state; independent of CLR |
| 5, 9 | Channel 1 & 2 True Output (Q) | Primary registered output; reflects stored D value after clock edge, unless overridden by PRE/CLR |
| 6, 8 | Channel 1 & 2 Complement Output (Q̅) | Inverted registered output; always opposite logic state of corresponding Q pin |
| 7 | Ground (GND) | Reference return path for all internal circuitry and I/O; must be low-impedance connection |
| 14 | Positive Supply (VCC) | 5-V power rail; requires local 0.1-μF bypass capacitor placed adjacent to pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | Guaranteed VIH = 2.0 V, VIL = 0.8 V at VCC = 5 V - eliminates level-shifters when interfacing with 74LS/74ALS families |
| Asynchronous Control | Dual independent PRE/CLR per channel - enables immediate state override without waiting for clock edge |
| Wide Temperature Range | –55°C to +125°C operation - validated for deployment in avionics, downhole tools, and engine-control modules |
| Low Static Power | ICC ≤ 40 µA at VCC = 6 V - reduces standby current in battery-backed or low-power monitoring systems |
| Controlled Edge Rates | Input transition time ≤500 ns (VCC = 4.5 V) - prevents metastability and shoot-through current in noisy environments |
Applications
| Toggle Switch Emulation | Divide-by-2 Clock Generation |
|---|---|
Use Scenario: Replacing mechanical toggle switches with momentary pushbuttons in space-constrained front panels or sealed enclosures. IC Role / Device Role / Timing Role: D flip-flop configured as T flip-flop (D tied to Q̅); converts single button press into stable, debounced output state toggle. Use Value: Eliminates mechanical wear, reduces BOM cost, and improves long-term reliability in industrial HMI and test equipment. | Use Scenario: Generating a precise 50% duty-cycle clock signal at half the frequency of a master oscillator in digital counters or serial interfaces. IC Role / Device Role / Timing Role: First-stage divider using one channel's Q output fed back to its own D input; CLK input driven by source clock. Use Value: Provides deterministic, edge-aligned halving without jitter accumulation or external feedback components. |
| State Synchronization | Power-On Reset Sequencing |
Use Scenario: Aligning asynchronous control signals (e.g., interrupt requests or sensor triggers) to a system clock domain before processing. IC Role / Device Role / Timing Role: Dual-channel usage: first stage captures async event, second stage re-samples output to eliminate metastability. Use Value: Ensures glitch-free synchronization with <10⁻⁹ probability of failure per million cycles at 25 MHz. | Use Scenario: Establishing known initial states for downstream logic during cold start or brownout recovery in embedded controllers. IC Role / Device Role / Timing Role: PRE/CLR pins driven by RC-based power-on reset circuit; forces both Q outputs LOW at power-up. Use Value: Guarantees deterministic startup behavior without software initialization delay or external sequencer IC. |
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 |
|---|---|---|---|
| SN74HCT74DR | Same HCT logic family, identical pinout, but offered in SOIC-14 with tape-and-reel packaging and active production status | Direct replacement where long-term supply continuity and RoHS compliance are required | Select SN74HCT74DR for new designs requiring guaranteed availability and TI's current manufacturing baseline |
| MC74HC74ADTR2G | HC-family variant: CMOS-input thresholds (VIH = 3.15 V), wider 2–6 V supply range, but no TTL compatibility | Suitable for pure-CMOS systems or battery-powered designs needing flexible VCC, not mixed TTL/CMOS | Choose MC74HC74ADTR2G only if interfacing exclusively with HC/HCT or 3.3-V logic; avoid when driving legacy TTL loads |
Compared with CD74HCT74M, SN74HCT74DR offers assured long-term sourcing and identical electrical behavior, while MC74HC74ADTR2G trades TTL compatibility for broader supply flexibility - making the former ideal for drop-in upgrades and the latter appropriate only in fully CMOS-designed systems.
Availability
CD74HCT74M is available at Aetrix Electronics and suitable for industrial control panels, aerospace avionics modules, and automotive engine management systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74HCT74M 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 over 90 years of innovation in high-reliability electronic components.
The CD74HCT74M belongs to TI's legacy HCT logic portfolio designed specifically for seamless integration between TTL-based legacy systems and modern CMOS-based subsystems in mission-critical applications.
FAQ
What is the supply voltage range supported by the CD74HCT74M?
The CD74HCT74M operates strictly within 4.5 V to 5.5 V. It is not rated for 3.3-V operation or for voltages exceeding 5.5 V. This narrow range ensures TTL-compatible input thresholds and robust noise immunity in 5-V systems. Operating outside this window may cause undefined logic states or damage. Always verify VCC stability within ±5% tolerance during design validation of the CD74HCT74M.
Does the CD74HCT74M support asynchronous preset and clear functions?
Yes, the CD74HCT74M provides fully independent asynchronous preset (PRE) and clear (CLR) inputs for each of its two D-type flip-flop channels. Both are active-low and take immediate effect - overriding clock and data inputs to force Q = HIGH (PRE) or Q = LOW (CLR). These functions remain operational across the full –55°C to +125°C temperature range, making the CD74HCT74M suitable for fail-safe control in safety-critical hardware.
What is the maximum clock frequency guaranteed for the CD74HCT74M?
The CD74HCT74M guarantees a maximum clock frequency of 25 MHz over the commercial temperature range (–40°C to +85°C) and 20 MHz over the full –55°C to +125°C range, as specified in the switching characteristics table. This rating assumes CL = 50 pF load and proper bypassing. Exceeding these limits risks setup/hold violations and metastability. System timing margins must be verified using the published tsu = 15 ns and th = 3 ns values for the CD74HCT74M.
Can the CD74HCT74M be used as a divide-by-2 counter?
Yes, the CD74HCT74M can function as a divide-by-2 counter by connecting the Q̅ output of one channel to its D input and applying the input clock to CLK. Each rising edge toggles Q, producing a 50% duty-cycle square wave at half the input frequency. This configuration is explicitly validated in TI's application notes and leverages the CD74HCT74M's precise edge-triggered behavior and low propagation skew between Q and Q̅ outputs.
Is the CD74HCT74M pin-compatible with the CD74HC74M?
No, the CD74HCT74M and CD74HC74M are not pin-compatible replacements. While both use SOIC-14 packages and share identical pin numbering and functions, their input threshold specifications differ fundamentally: CD74HCT74M has TTL-compatible VIH/VIL (2.0 V/0.8 V), whereas CD74HC74M uses CMOS thresholds (3.15 V/1.35 V at VCC = 4.5 V). Interchanging them without verifying driver compatibility may result in logic errors. Always validate signal levels when substituting the CD74HCT74M for any HC-series device.
CD74HCT74M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 35ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
CD74HCT74M FAQ
1.How can I place an order for CD74HCT74M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT74M 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 CD74HCT74M reliable?
The price and inventory of CD74HCT74M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT74M is usually 5 days.
3.What payment methods are accepted for CD74HCT74M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT74M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT74M?
CD74HCT74M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT74M 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 CD74HCT74M?
For technical support, including CD74HCT74M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT74M requirements.
6.How does Aetrix verify that CD74HCT74M is sourced from the original manufacturer or authorized distributors?
All CD74HCT74M 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 CD74HCT74M meets industry standards.
7.What is the process for return or replacement of CD74HCT74M?
All CD74HCT74M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT74M, 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 CD74HCT74M part is unused and in its original packaging.
Return procedure for CD74HCT74M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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