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STMicroelectronics M74HC74TTR
- Part No.:
- M74HC74TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
M74HC74TTR.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,616
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Product details
Overview
M74HC74TTR from STMicroelectronics is a high-speed CMOS dual D-type flip-flop with independent asynchronous preset and clear, edge-triggered on the rising clock transition, operating from 2V to 6V supply, with tPLH/tPHL ≤ 26 ns (VCC = 6V), IOH/IOL ≥ 4 mA, and fMAX = 67 MHz (typ.) - used in synchronous logic control, clock domain synchronization, and data latching in industrial PLC I/O modules.
For engineers reviewing the M74HC74TTR datasheet, M74HC74TTR pinout, M74HC74TTR application, or M74HC74TTR equivalent, key selection criteria include propagation delay symmetry, rail-to-rail input noise immunity (VNIH/VNIL = 28% VCC min), guaranteed 4 mA drive strength at 6V, and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The M74HC74TTR implements two independent edge-triggered D flip-flops using silicon gate C2MOS technology, each with separate asynchronous active-low preset (PR) and clear (CLR) inputs that override clock and data. Its symmetrical output impedance ensures matched rise/fall times (tTLH ≈ tTHL) and balanced propagation delays (tPLH ≅ tPHL).
It supports wide-voltage operation (2–6 V), delivers rail-compatible input thresholds (VIH = 3.15 V @ 4.5 V, VIL = 1.35 V @ 4.5 V), and maintains low quiescent current (ICC = 2 µA max @ TA = 25°C), enabling use in battery-backed or low-power control subsystems without sacrificing speed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V logic families without level shifters |
| fMAX | 67 MHz (typ. @ VCC = 6 V) - supports high-speed state machine clocking up to ~15 ns cycle time |
| tPLH / tPHL | 13 ns / 13 ns (typ. @ VCC = 6 V, CL = 50 pF) - ensures deterministic setup/hold timing in synchronous pipelines |
| IOH / IOL | –4.0 mA / +4.0 mA (min. @ VCC = 4.5 V) - drives standard TTL loads or multiple 74HC inputs directly |
| VNIH / VNIL | 28 % VCC (min.) - provides robust noise margin against EMI in industrial control environments |
| ICC (Quiescent) | 2 µA (max. @ TA = 25°C) - suitable for always-on monitoring circuits with µA-level power budgets |
Pinout & Package
TSSOP-14 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free, moisture sensitivity level 1 (MSL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | 1CLR, 2CLR | Asynchronous active-low reset - forces Q = 0, Q̅ = 1 regardless of clock or D state |
| 2, 12 | 1D, 2D | Data input - sampled on rising edge of corresponding clock; determines next-state Q output |
| 3, 11 | 1CK, 2CK | Positive-edge-triggered clock - initiates state update only on LOW→HIGH transition |
| 4, 10 | 1PR, 2PR | Asynchronous active-low preset - forces Q = 1, Q̅ = 0 independently of clock or D |
| 5, 9 | 1Q, 2Q | True output - reflects stored D value after clock edge or asynchronous PR/CLR assertion |
| 6, 8 | 1Q̅, 2Q̅ | Inverted output - complementary to Q; usable as feedback or differential signaling pair |
| 7 | GND | Ground reference - return path for all internal logic and I/O currents |
| 14 | VCC | Positive supply - powers all gates and output drivers; must be decoupled locally |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical output drive | |IOH| = IOL = 4 mA min - eliminates skew between rising/falling edges in bus-driving applications |
| Balanced propagation delays | tPLH ≅ tPHL (≤ 26 ns diff @ 6 V) - critical for glitch-free sampling in dual-edge-sensitive systems |
| High noise immunity | VNIH = VNIL = 28 % VCC min - rejects >1 V peak noise on 5 V rails without false triggering |
| Wide voltage operation | 2–6 V supply range - interoperable across legacy 5 V and modern 3.3 V microcontroller I/O domains |
Applications
| Industrial PLC Input Latching | Serial-to-Parallel Data Capture |
|---|---|
Use Scenario: Capturing momentary sensor signals (e.g., limit switches, photoelectric triggers) in noisy factory environments. IC Role / Device Role / Timing Role: Dual D flip-flop latches synchronized to system clock, holding input state until CPU read cycle. Use Value: Asynchronous CLR/PR allows hardware-initiated reset on fault detection; 28% VCC noise margin prevents spurious toggling. | Use Scenario: Converting serial bitstream from UART or SPI peripheral into parallel byte for MCU GPIO read. IC Role / Device Role / Timing Role: Two-stage shift register stage - first FF captures bit, second FF holds stable byte-aligned output. Use Value: Matched tPLH/tPHL ensures clean byte boundary alignment; 4 mA drive supports direct connection to 8-bit MCU port pins. |
| Motor Control State Synchronization | Power Sequencing Logic |
Use Scenario: Aligning enable/disable commands between isolated MCU and gate driver ICs across different supply domains. IC Role / Device Role / Timing Role: Synchronizer for asynchronous control signals crossing clock domains (e.g., 100 MHz MCU → 10 MHz motor PWM timer). Use Value: Dual FF structure provides metastability hardening; 67 MHz fMAX accommodates fast handshake protocols. | Use Scenario: Generating sequenced enable signals for multi-rail power supplies (e.g., 12 V → 5 V → 3.3 V → 1.8 V). IC Role / Device Role / Timing Role: Edge-triggered storage element in discrete sequencing logic, replacing microcontroller-based soft sequencing. Use Value: Asynchronous PR/CLR allows manual override or fault-induced shutdown; 2 µA ICC enables always-on sequencing monitor. |
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 |
|---|---|---|---|
| SN74HC74DR | Same logic function, SOIC-14 package (3.9 × 8.7 mm), higher ICC (40 µA max @ –55°C to 125°C) | Less suitable for ultra-low-power designs; better thermal dissipation in high-ambient environments | Select when board space permits larger SOIC and long-term reliability under thermal cycling is prioritized |
| 74LVC74ABQ | 3.3 V only (1.65–3.6 V), lower VCC range, faster tPD (2.5 ns typ. @ 3.3 V), smaller XSON-14 package | Not compatible with 5 V systems; requires level translation if interfacing with legacy 5 V peripherals | Select for compact, high-speed 3.3 V-only designs where 5 V tolerance is unnecessary |
Compared with SN74HC74DR and 74LVC74ABQ, the M74HC74TTR uniquely balances 2–6 V interoperability, TSSOP-14 footprint efficiency, and sub-µA static current - making it optimal for mixed-voltage industrial control boards needing layout density and supply flexibility.
Availability
M74HC74TTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, motor control sequencers, serial-to-parallel data converters, and power supply sequencing logic requiring stable component supply across extended temperature ranges (–55°C to +125°C).
Supply support for M74HC74TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The M74HC74TTR belongs to the 74HC logic family - engineered for high-speed, low-power, pin-compatible replacement of legacy 74LS devices in industrial automation, test equipment, and programmable logic interfaces.
FAQ
Is M74HC74TTR compatible with 5 V TTL inputs?
Yes - its VIH threshold is 3.15 V (min.) at VCC = 4.5 V and 4.2 V (min.) at VCC = 6 V, exceeding TTL's 2.0 V high-level requirement. It accepts standard 5 V TTL outputs directly without level shifting, provided VCC is set to 5 V or 6 V.
What is the minimum pulse width required on CLR and PR inputs?
At VCC = 6 V, the minimum pulse width for CLR and PR is 6 ns (typ.) and 16 ns (max.) over –55°C to +125°C. This ensures reliable asynchronous assertion even in fast transient conditions, verified per AC electrical characteristics table on page 5 of the official datasheet.
Does M74HC74TTR support hot insertion or live insertion?
No - it lacks Ioff protection or power-off isolation. Applying input signals while VCC is unpowered may cause latch-up or excessive ICC due to internal diode conduction. Always power VCC before applying logic signals, per Absolute Maximum Ratings (VI = –0.5 V to VCC + 0.5 V).
Can both Q and Q̅ outputs drive separate loads simultaneously?
Yes - each output is fully buffered and rated for ±4 mA (min.) at VCC = 4.5 V. Driving independent loads (e.g., one to MCU input, one to LED indicator) is supported, but total capacitive load per output should remain ≤ 50 pF to maintain specified tPLH/tPHL and avoid ringing.
M74HC74TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 67 MHz
- Max Propagation Delay @ V, Max CL:
- 26ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 2 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
M74HC74TTR FAQ
1.How can I place an order for M74HC74TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC74TTR 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 M74HC74TTR reliable?
The price and inventory of M74HC74TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC74TTR is usually 5 days.
3.What payment methods are accepted for M74HC74TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC74TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC74TTR?
M74HC74TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC74TTR 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 M74HC74TTR?
For technical support, including M74HC74TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC74TTR requirements.
6.How does Aetrix verify that M74HC74TTR is sourced from the original manufacturer or authorized distributors?
All M74HC74TTR 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 M74HC74TTR meets industry standards.
7.What is the process for return or replacement of M74HC74TTR?
All M74HC74TTR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC74TTR, 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 M74HC74TTR part is unused and in its original packaging.
Return procedure for M74HC74TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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