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STMicroelectronics 74LCX74MTR
- Part No.:
- 74LCX74MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74LCX74MTR.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,501
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Product details
Overview
74LCX74MTR from STMicroelectronics is a low-voltage CMOS dual D-type flip-flop with asynchronous preset and clear, 5V-tolerant inputs, 2.0–3.6V operation, 150 MHz max clock frequency at VCC = 3V, and ±24 mA output drive. It serves as a synchronous edge-triggered storage element in 3.3V logic systems interfacing with legacy 5V buses, such as PCI.
For engineers reviewing the 74LCX74MTR datasheet, 74LCX74MTR pinout, 74LCX74MTR application, or 74LCX74MTR equivalent, key selection criteria include 5V input tolerance, symmetrical output drive (|IOH| = IOL ≥ 24 mA), balanced propagation delays (tPLH ≅ tPHL), latch-up immunity (>500 mA), and TSSOP-14 package compatibility with space-constrained PCB layouts.
Technical Context
This device implements two independent positive-edge-triggered D flip-flops, each with active-low asynchronous set (PR) and reset (CLR) inputs. All control signals operate independently of the clock, enabling immediate state override without clock dependency.
It uses sub-micron C2MOS technology to achieve AC/ACT-family speed at 3.3V while reducing power consumption. Input protection circuits ensure 2 kV HBM ESD immunity, and power-down protection maintains high-impedance behavior on inputs/outputs when VCC = 0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 3.6 V - Enables direct integration into 3.3V supply domains with 1.5V data retention during brownout. |
| fMAX | 150 MHz at VCC = 3V - Supports high-speed synchronous logic in timing-critical interfaces like PCI bus control. |
| IOL / IOH | ±24 mA at VCC = 3.0–3.6V - Drives standard 50 Ω transmission lines or multiple 74LCX loads without external buffers. |
| tPLH / tPHL | 1.5 ns to 8.0 ns (VCC = 2.7–3.6V, CL = 50 pF) - Ensures predictable setup/hold timing margins in multi-stage pipeline designs. |
| VIH / VIL | VIH = 2.0 V, VIL = 0.8 V at VCC = 2.7–3.6V - Guarantees reliable 5V-tolerant input recognition across industrial temperature range. |
| ESD Rating | HBM > 2000 V, MM > 200 V - Meets MIL-STD-883 requirements for handling robustness in automated assembly environments. |
| Latch-up Immunity | >500 mA per JESD17 - Prevents destructive parasitic SCR conduction during transient overvoltage events. |
Pinout & Package
TSSOP-14 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | 1CLR, 2CLR | Active-low asynchronous reset - Forces Q = L, Q̄ = H regardless of clock or D state. |
| 2, 12 | 1D, 2D | Data input - Captured at rising edge of corresponding clock; determines next-state Q value. |
| 3, 11 | 1CK, 2CK | Positive-edge clock - Synchronizes data transfer from D to Q; edge-sensitive, not level-sensitive. |
| 4, 10 | 1PR, 2PR | Active-low asynchronous preset - Forces Q = H, Q̄ = L independent of clock or D. |
| 5, 9 | 1Q, 2Q | True output - Complementary to Q̄; provides non-inverted stored data for downstream logic. |
| 6, 8 | 1Q̄, 2Q̄ | Inverted output - Provides logical complement of Q; enables direct connection to enable/disable logic. |
| 7 | GND | Ground reference - Return path for all internal current sinks; must be low-impedance for noise immunity. |
| 14 | VCC | Supply voltage - Powers internal logic; decoupling capacitor required within 1 cm for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant inputs | Accepts 0–5.5 V input signals while operating from 2.0–3.6 V supply - eliminates level-shifter ICs in mixed-voltage systems. |
| Symmetrical output drive | |IOH| = IOL ≥ 24 mA at VCC = 3V - Enables matched rise/fall times and reduced signal distortion on shared buses. |
| Balanced propagation delays | tPLH ≅ tPHL - Minimizes clock-to-output skew between true and complement outputs for clean differential signaling. |
| Power-down protection | Inputs and outputs remain high-impedance when VCC = 0V - prevents back-driving or contention in hot-swap or partial-power-down systems. |
| PCI bus compliance | Guaranteed 24 mA drive at PCI voltage levels - meets electrical specifications for add-in card interface logic without external drivers. |
Applications
| PCI Bus Interface Logic | Low-Power FPGA Configuration Latching |
|---|---|
|
Use Scenario: Latching address/data strobes and control signals on 32-bit 33 MHz PCI slots in embedded computing modules. IC Role / Device Role / Timing Role: Dual edge-triggered storage element synchronizing asynchronous host writes to local memory-mapped peripherals. Use Value: 5V-tolerant inputs accept native PCI signaling; ±24 mA drive meets PCI load requirements without buffer amplification. |
Use Scenario: Capturing configuration bitstream status flags and handshake signals during FPGA startup and reconfiguration cycles. IC Role / Device Role / Timing Role: Synchronous register holding INIT_B, DONE, or CCLK-ready states for system-level boot coordination. Use Value: 2.0–3.6V operation matches FPGA core voltage; low ICC (10 µA quiescent) minimizes standby power in battery-backed systems. |
| Industrial I/O Expansion Module | Automotive Body Control Unit Clock Domain Isolation |
|
Use Scenario: Debouncing and synchronizing mechanical switch inputs across isolated 3.3V microcontroller domains in PLC I/O cards. IC Role / Device Role / Timing Role: Dual DFF providing metastability-hardened sampling of asynchronous GPIO signals before software polling. Use Value: Asynchronous PR/CLR allows forced initialization on power-up; latch-up immunity (>500 mA) withstands field-induced transients. |
Use Scenario: Isolating CAN controller clock domain from microcontroller domain in body electronics modules operating across -40°C to 125°C. IC Role / Device Role / Timing Role: Edge-triggered register transferring wake-up event flags from low-power sleep domain to active processing domain. Use Value: Guaranteed operation down to -55°C; 150 MHz fMAX supports fast wake-up response; TSSOP-14 footprint fits tight automotive PCB constraints. |
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 |
|---|---|---|---|
| SN74LVC74APWR | Lower drive (±24 mA only at VCC = 3.3V); no 5V tolerance on outputs; 1.65–3.6V VCC range. | Requires external clamping for 5V input interfacing; unsuitable for direct PCI bus connection without level translation. | Select when full 5V input tolerance is unnecessary and cost sensitivity outweighs interface flexibility. |
| 74ALVC74D,118 | Higher speed (tPD = 2.5 ns typ), but narrower VCC range (2.3–3.6V); no guaranteed 5V input tolerance beyond 3.6V. | Not validated for PCI bus levels; lacks documented latch-up immunity >500 mA per JESD17. | Prefer for ultra-low-skew applications where absolute 5V tolerance and industrial robustness are secondary to raw speed. |
Compared with SN74LVC74APWR and 74ALVC74D,118, the 74LCX74MTR uniquely combines 5V-tolerant inputs, PCI-compliant drive, and JESD17-certified latch-up immunity - making it the only choice for legacy-bus interfacing in harsh industrial environments.
Availability
74LCX74MTR is available at Aetrix Electronics and suitable for PCI bus interface logic, low-power FPGA configuration latching, and industrial I/O expansion modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LCX74MTR 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, specializing in automotive, industrial, and power management solutions with broad analog, digital, and mixed-signal product portfolios.
The 74LCX logic family was engineered for high-speed, low-voltage 3.3V systems requiring interoperability with 5V TTL/CMOS environments - targeting PCI, embedded control, and portable electronics where power efficiency and signal integrity are critical.
FAQ
Can 74LCX74MTR operate safely with VCC = 1.8V?
No. The recommended operating VCC range is strictly 2.0 V to 3.6 V per STMicroelectronics datasheet Section 4. Below 2.0 V, DC parameters including VIH, VOL, and tPLH/tPHL are not guaranteed, and functionality may fail unpredictably. Data retention is specified only at 1.5 V, not operational mode.
Is the 74LCX74MTR pin-compatible with standard 74HC74 in SO-14 packages?
Yes - the 74LCX74MTR shares identical pin numbering and logic function mapping with 74HC74 and 74LS74 in dual D-flip-flop configuration. However, its TSSOP-14 package (74LCX74MTR) differs physically from SO-14 (74LCX74M), requiring PCB layout adaptation despite functional equivalence.
Does the device support hot insertion when VCC = 0V?
Yes - power-down protection ensures inputs and outputs enter high-impedance state when VCC = 0V, preventing back-current flow or bus contention during live insertion. This behavior is verified per datasheet Section "Power Down Protection on Inputs and Outputs" and supports hot-swap compliant system architectures.
What is the maximum capacitive load this device can drive reliably at 150 MHz?
Per AC Electrical Characteristics (Section 5), CL = 50 pF is the test condition for fMAX = 150 MHz. Driving higher capacitance degrades edge rate and increases propagation delay; sustained 150 MHz operation beyond 50 pF requires empirical validation with board-level signal integrity analysis and may necessitate series termination or driver buffering.
74LCX74MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LCX
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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:
- 150 MHz
- Max Propagation Delay @ V, Max CL:
- 7ns @ 3.3V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Current - Quiescent (Iq):
- 10 µA
- Input Capacitance:
- 6 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
74LCX74MTR FAQ
1.How can I place an order for 74LCX74MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX74MTR 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 74LCX74MTR reliable?
The price and inventory of 74LCX74MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX74MTR is usually 5 days.
3.What payment methods are accepted for 74LCX74MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX74MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX74MTR?
74LCX74MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX74MTR 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 74LCX74MTR?
For technical support, including 74LCX74MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX74MTR requirements.
6.How does Aetrix verify that 74LCX74MTR is sourced from the original manufacturer or authorized distributors?
All 74LCX74MTR 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 74LCX74MTR meets industry standards.
7.What is the process for return or replacement of 74LCX74MTR?
All 74LCX74MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX74MTR, 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 74LCX74MTR part is unused and in its original packaging.
Return procedure for 74LCX74MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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