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STMicroelectronics M74HC76M1R
- Part No.:
- M74HC76M1R
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC76M1R.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 16SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,019
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Product details
Overview
M74HC76M1R from STMicroelectronics is a high-speed CMOS dual J-K flip-flop with independent asynchronous preset (PR) and clear (CLR), edge-triggered on the negative-going clock transition, operating from 2V to 6V, delivering tPLH/tPHL ≈ 21 ns (typ.) at VCC = 6V and fMAX = 67 MHz (typ.), used in synchronous logic control and state machine design within industrial timing circuits.
For engineers reviewing the M74HC76M1R datasheet, M74HC76M1R pinout, M74HC76M1R application, or M74HC76M1R equivalent, key selection factors include dual independent J-K functionality with active-low asynchronous controls, symmetrical 4 mA output drive, ±25 mA DC output current rating, and guaranteed operation across –55°C to +125°C.
Technical Context
The M74HC76M1R implements two identical, electrically isolated J-K flip-flops in a single SO-16 package, each with separate J, K, CLK, PR, CLR, Q, and Q̅ terminals. Its C2MOS silicon gate process enables low ICC = 2 µA (max) at TA = 25°C and high noise immunity (VNIH/VNIL = 28% VCC min).
It operates as a negative-edge-triggered sequential logic device: state changes occur only on the falling edge of CK, while PR and CLR override clock action asynchronously. Propagation delays are balanced (tPLH ≅ tPHL), and input rise/fall times are specified up to 400 ns at VCC = 6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2 V to 6 V - supports mixed-voltage system interfacing and battery-powered logic designs |
| fMAX (Typ.) | 67 MHz at VCC = 6 V - enables high-speed counter and register applications in digital control systems |
| tPLH / tPHL (Typ.) | 21 ns at VCC = 6 V - ensures precise timing alignment between dual flip-flops in pipeline stages |
| IOL / IOH (Min.) | 4 mA - drives standard TTL loads or multiple 74HC inputs without buffering |
| VIH / VIL Thresholds | VIL = 1.8 V, VIH = 4.2 V at VCC = 6 V - provides 40% noise margin for robust signal integrity |
| ICC (Max.) | 40 µA over –55°C to +125°C - enables ultra-low-power hold-state operation in always-on logic |
| Operating Temperature | –55°C to +125°C - qualified for automotive under-hood and industrial motor-control environments |
Pinout & Package
Package: SO-16 (Small Outline, 150 mil width), JEDEC MS-012AC compliant, surface-mount, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 6 | 1CK, 2CK | Negative-edge clock inputs - trigger state update only on falling transition; require clean edges ≤400 ns rise/fall |
| 2, 7 | 1PR, 2PR | Active-low preset - forces Q = H, Q̅ = L asynchronously, overriding clock and data |
| 3, 8 | 1CLR, 2CLR | Active-low clear - forces Q = L, Q̅ = H asynchronously, independent of clock phase |
| 4, 9 | 1J, 2J | Data inputs controlling set behavior on next clock edge when K = L |
| 10, 14 | 1Q̅, 2Q̅ | Inverted outputs - provide complementary logic states for differential signaling or feedback paths |
| 11, 15 | 1Q, 2Q | True outputs - deliver registered logic state synchronized to CK falling edge |
| 12, 16 | 1K, 2K | Data inputs controlling reset behavior on next clock edge when J = L |
| 5 | VCC | Positive supply rail - must be decoupled locally with ≥100 nF ceramic capacitor |
| 13 | GND | Digital ground reference - shared return path for both flip-flops; requires low-impedance PCB routing |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent J-K flip-flops | Enables compact implementation of 2-bit counters, shift registers, or state machines without inter-device skew |
| Asynchronous active-low PR/CLR | Allows immediate initialization or fault recovery without waiting for clock edge or data setup |
| Symmetrical output drive (|IOH| = IOL = 4 mA) | Eliminates need for external pull-ups/downs in bus-driven or wired-OR configurations |
| High noise immunity (28% VCC) | Reduces susceptibility to crosstalk and EMI in dense PCB layouts with mixed analog/digital sections |
| Wide temperature range (–55°C to +125°C) | Supports deployment in engine control units, power inverters, and outdoor industrial controllers |
Applications
| Industrial PLC Counter Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Counting encoder pulses in real-time motion control loops requiring deterministic state updates. IC Role / Device Role / Timing Role: Dual J-K flip-flop acts as synchronous 2-bit binary counter with asynchronous reset for emergency stop recovery. Use Value: Balanced tPLH/tPHL (21 ns typ.) ensures cycle-accurate counting at 67 MHz clock rates, minimizing jitter in position tracking. |
Use Scenario: Managing window lift/lower sequencing with direction and limit-switch feedback. IC Role / Device Role / Timing Role: Implements edge-sensitive latching logic for push-button commands and status flag storage. Use Value: Active-low PR/CLR allows direct connection to microcontroller GPIOs without level-shifting, reducing BOM count. |
| Medical Infusion Pump Controller | Energy Meter Pulse Accumulator |
|
Use Scenario: Capturing and debouncing mechanical switch inputs in safety-critical drug delivery sequencing. IC Role / Device Role / Timing Role: Provides metastability-hardened input synchronization using dual-stage J-K sampling. Use Value: Guaranteed operation down to –55°C enables reliable cold-storage transport mode monitoring without recalibration. |
Use Scenario: Accumulating kWh pulse outputs from metrology ICs in smart electricity meters. IC Role / Device Role / Timing Role: Forms 2-bit ripple counter stage feeding into larger accumulator logic. Use Value: Low ICC = 2 µA (max) extends battery life in tamper-proof, long-life utility meter designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual J-K flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC76DR | TI part; identical pinout and AC specs, but wider VCC range (2–6 V vs. TI's 2–6 V), same –40°C to +85°C temp grade | Limited to commercial temperature range; not rated for extended –55°C to +125°C operation | Select when cost sensitivity outweighs extended temperature requirement and TI supply chain preference applies |
| 74VHC76M | ON Semiconductor part; 3.3 V optimized (fMAX = 115 MHz at VCC = 3.3 V), but reduced noise margin (20% VCC) | Better speed at 3.3 V, but lower noise immunity limits use in noisy motor-drive environments | Prefer for high-speed 3.3 V systems where board-level noise is tightly controlled |
Compared with SN74HC76DR and 74VHC76M, the M74HC76M1R uniquely combines extended temperature support (–55°C to +125°C), high noise immunity (28% VCC), and proven industrial reliability-making it optimal for harsh-environment control logic where thermal stability and EMI resilience are non-negotiable.
Availability
M74HC76M1R is available at Aetrix Electronics and suitable for industrial PLC counter modules, automotive body control units, medical infusion pump controllers, and energy meter pulse accumulators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for M74HC76M1R 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, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and discrete components for industrial, automotive, and consumer markets.
The M74HC76 belongs to ST's legacy HC logic family, engineered for pin- and function-compatibility with industry-standard 74-series logic while delivering enhanced speed, noise immunity, and wide-voltage operation for industrial control and instrumentation.
FAQ
Is M74HC76M1R compatible with 5 V TTL logic levels?
Yes - at VCC = 5 V, the M74HC76M1R guarantees VIH = 3.15 V (min) and VIL = 1.35 V (max), exceeding standard TTL thresholds (2.0 V VIH, 0.8 V VIL). Its 4 mA output drive can directly interface with 74LS loads, though series termination may be needed for fast edges on long traces.
Can PR and CLR be tied together for synchronous reset functionality?
No - PR and CLR are asynchronous and active-low; tying them does not create synchronous behavior. To achieve clock-synchronized reset, J and K must both be held HIGH while applying a clock edge, leveraging the TOGGLE function per truth table. External gating logic is required for true synchronous reset.
What is the maximum capacitive load this device can drive reliably?
Driving CL > 50 pF degrades tPLH/tPHL and increases propagation delay variation. The datasheet specifies AC characteristics at CL = 50 pF; for loads up to 100 pF, derate fMAX by ~25% and verify timing margins with worst-case VCC/temperature corners using the CPD = 38 pF value in power calculations.
Does M74HC76M1R support hot insertion or live insertion into powered systems?
No - the device lacks hot-swap protection circuitry. Applying VCC before GND, or connecting inputs before supply stabilization, risks latch-up due to internal diode conduction. Always follow proper power sequencing: GND first, then VCC, then signals - and use series resistors on all inputs if live insertion is unavoidable.
M74HC76M1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Set(Preset) and Reset
- Type:
- JK Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 67 MHz
- Max Propagation Delay @ V, Max CL:
- 21ns @ 6V, 50pF
- Trigger Type:
- Negative 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:
- Through Hole
- Supplier Device Package:
- 14-DIP
M74HC76M1R FAQ
1.How can I place an order for M74HC76M1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC76M1R 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 M74HC76M1R reliable?
The price and inventory of M74HC76M1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC76M1R is usually 5 days.
3.What payment methods are accepted for M74HC76M1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC76M1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC76M1R?
M74HC76M1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC76M1R 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 M74HC76M1R?
For technical support, including M74HC76M1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC76M1R requirements.
6.How does Aetrix verify that M74HC76M1R is sourced from the original manufacturer or authorized distributors?
All M74HC76M1R 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 M74HC76M1R meets industry standards.
7.What is the process for return or replacement of M74HC76M1R?
All M74HC76M1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC76M1R, 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 M74HC76M1R part is unused and in its original packaging.
Return procedure for M74HC76M1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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