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STMicroelectronics 74LCX374MTR
- Part No.:
- 74LCX374MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LCX374MTR.pdf
- Description:
- IC FLIP FLOP OCTAL D 3ST 20-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,524
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Product details
Overview
74LCX374MTR from STMicroelectronics is an octal non-inverting D-type flip-flop with 3-state outputs, 5V-tolerant I/O, and operation from 2.0V to 3.6V. It delivers 150 MHz minimum clock frequency at 3V, ±24 mA output drive, balanced tPLH/tPHL propagation delays, and supports PCI bus levels at 24 mA. It is used in 3.3V system bus interfaces requiring level translation and output isolation.
For engineers reviewing the 74LCX374MTR datasheet, 74LCX374MTR pinout, 74LCX374MTR application, or 74LCX374MTR equivalent, key selection criteria include 5V-tolerant input/output compatibility, 3-state enable timing (tPZL/tPHZ), symmetrical output drive strength, latch-up immunity (>500 mA), and SO-20 package thermal performance under industrial temperature range (-55°C to +125°C).
Technical Context
The 74LCX374 implements edge-triggered storage with a single positive-edge clock (CK) and active-low 3-state output enable (OE). Its internal flip-flops retain data independently of OE state, enabling concurrent data latching and bus release.
Designed using sub-micron C2MOS technology, it achieves AC/ACT-family speed at 3.3V while consuming significantly less power. Input and output protection circuits ensure 2 kV HBM ESD immunity and robust operation across mixed-voltage environments (3.3V core with 5V signal interfacing).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2.0 V to 3.6 V - Enables direct integration into 3.3V logic systems with 1.5V data retention during sleep |
| fMAX (min) | 150 MHz at VCC = 3.0 V - Supports high-speed data capture in memory address latches and pipeline registers |
| IOL / IOH (min) | ±24 mA at VCC = 3.0–3.6 V - Drives standard PCI loads without external buffers |
| tPLH / tPHL (max) | 8.5 ns at VCC = 3.0–3.6 V - Ensures tight timing margin for synchronous bus handshaking |
| tPZL / tPZH (max) | 8.5 ns - Guarantees fast bus turnaround when toggling OE in shared-data-path applications |
| VI / VO Tolerance | 0 V to 5.5 V - Allows safe connection to legacy 5V peripherals without level shifters |
| Latch-up Immunity | >500 mA per JESD17 - Prevents destructive latch-up during hot-swap or supply sequencing events |
Pinout & Package
74LCX374MTR is supplied in a 20-pin SOIC (Small Outline Integrated Circuit) package, designated SO-20 per STMicroelectronics mechanical drawing PO13L, with 1.27 mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low 3-state output enable | Controls all eight Q outputs simultaneously; high = high-impedance, low = functional logic state |
| 2,5,6,9,12,15,16,19 (Q0–Q7) | Non-inverting 3-state outputs | Reflect D-input states on CK rising edge; tri-stated when OE is high |
| 3,4,7,8,13,14,17,18 (D0–D7) | Data inputs | Synchronously latched on rising edge of CK; 5V-tolerant, no external clamping required |
| 11 (CK) | Positive-edge clock input | Edge-triggered control signal; setup/hold times defined at 2.5 ns (min) |
| 10 (GND) | Ground reference | 0 V return path for all I/O and internal logic; decoupling recommended near pin |
| 20 (VCC) | Positive supply | Primary power rail for logic core and output drivers; operates from 2.0–3.6 V |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Inputs and outputs withstand 0–5.5 V regardless of VCC, eliminating level-shifter components in mixed-voltage designs |
| Symmetrical output drive | |IOH| = IOL ≥ 24 mA ensures matched rise/fall times and reduced signal distortion on bidirectional buses |
| Power-down protection | Input and output pins remain high-impedance and non-latching when VCC = 0 V, preventing back-driving of powered subsystems |
| Low dynamic power | CPD = 32 pF enables predictable ICC(opr) calculation: ICC = CPD × VCC × fIN + ICC/8, simplifying thermal budgeting |
| Industrial temperature range | Specified from –55 °C to +125 °C ambient, supporting deployment in automotive engine control and industrial PLC modules |
Applications
| PCI Bus Interface | Memory Address Latching |
|---|---|
Use Scenario: Interfacing a 3.3V microcontroller to a 5V PCI slot for add-in card control logic. IC Role / Device Role / Timing Role: Acts as a voltage-tolerant, edge-triggered register that captures address/data strobes and isolates the host bus during idle cycles. Use Value: Eliminates discrete level shifters while meeting PCI 2.2 DC loading requirements (24 mA sink/source) and timing skew limits (<1 ns). | Use Scenario: Latching 8-bit address segments in a 16-bit microprocessor-based embedded controller with external SRAM. IC Role / Device Role / Timing Role: Serves as a synchronous address buffer synchronized to the CPU's ALE or clock signal, holding stable addresses during memory read/write windows. Use Value: Provides guaranteed tS = 2.5 ns setup and th = 1.5 ns hold time at 3.3V, enabling reliable access to 15 ns SRAM devices. |
| Hot-Swappable I/O Expansion | Digital Signal Processor (DSP) Data Path |
Use Scenario: Managing isolated peripheral I/O lines in a modular industrial I/O rack where modules may be inserted or removed under power. IC Role / Device Role / Timing Role: Functions as a fault-isolated interface register with OE-controlled bus disconnection and latch-up immunity >500 mA. Use Value: Prevents back-current injection during hot insertion and maintains data integrity via independent D-to-Q storage unaffected by OE transitions. | Use Scenario: Buffering parallel data between a 3.3V DSP and external ADC/DAC with 5V-tolerant digital control lines. IC Role / Device Role / Timing Role: Provides synchronized, glitch-free sampling of control signals (e.g., CONVST, RD) with precise edge alignment to the DSP clock domain. Use Value: Achieves 150 MHz fMAX and <1 ns output skew, ensuring deterministic timing for real-time signal acquisition pipelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC374APW,118 | Lower VCC range (1.65–3.6 V); 24 mA drive at 3.3 V; identical SO-20 pinout | Not rated for –55 °C operation; lacks explicit PCI-level guarantee at 24 mA | Preferred for cost-sensitive consumer designs operating strictly within commercial temperature range |
| SN74LVCH16374ADGG | 16-bit, dual-rail (1.65–3.6 V), higher channel count; TSSOP-48 package | Requires PCB redesign; supports 1.8V I/O but not 5V-tolerant inputs | Selected when expanding bus width beyond 8 bits and migrating to 1.8V/3.3V mixed I/O systems |
Compared with 74LVC374APW and SN74LVCH16374ADGG, the 74LCX374MTR uniquely combines extended industrial temperature support, explicit PCI-compliant 24 mA drive, and full 5V tolerance-making it the only choice for legacy-compatible, ruggedized 3.3V bus interface designs.
Availability
74LCX374MTR is available at Aetrix Electronics and suitable for PCI bus interface design, memory address latching, hot-swappable I/O expansion, and DSP data path synchronization requiring stable component supply across extended temperature and mixed-voltage conditions.
Supply support for 74LCX374MTR 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 ICs with vertical manufacturing capabilities and broad analog/mixed-signal portfolio.
The 74LCX logic family was engineered for high-speed, low-voltage 3.3V systems requiring interoperability with 5V TTL/CMOS environments-targeting communications infrastructure, industrial control, and embedded computing applications.
FAQ
Can 74LCX374MTR operate with VCC = 1.8 V?
No. The recommended operating VCC range is 2.0 V to 3.6 V, with data retention down to 1.5 V. At 1.8 V, DC parameters including VIH/VIL thresholds and output drive fall outside specification, and AC performance (e.g., fMAX, tPLH) is not guaranteed. For 1.8 V systems, consider the 74LVC374 series instead.
Is the 74LCX374MTR pinout compatible with standard 74HC374?
Yes-pin-for-pin and functionally compatible with industry-standard 74x374 devices in SO-20 package. All signal names (D0–D7, Q0–Q7, CK, OE, VCC, GND), pin positions, and truth table behavior match. However, 74LCX374MTR adds 5V-tolerant I/O and enhanced speed/power characteristics not present in HC variants.
What is the maximum capacitive load this device can drive reliably?
The AC specifications (tPLH, tPHL, fMAX) are characterized with CL = 50 pF and RL = 500 Ω. While the outputs can source/sink ±24 mA, driving loads >50 pF increases propagation delay and may cause signal integrity issues unless compensated with series termination or reduced edge rates. For >100 pF loads, verify timing margins using actual board parasitics.
Does OE affect internal flip-flop state retention?
No. The OE signal controls only the output drivers' high-impedance state and has no effect on internal latch operation. Data at D inputs is captured on each CK rising edge regardless of OE level, and previously stored values remain intact-even while outputs are tri-stated-enabling seamless bus arbitration and multi-cycle data staging.
74LCX374MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 140 MHz
- Max Propagation Delay @ V, Max CL:
- -
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74LCX374MTR FAQ
1.How can I place an order for 74LCX374MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX374MTR 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 74LCX374MTR reliable?
The price and inventory of 74LCX374MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX374MTR is usually 5 days.
3.What payment methods are accepted for 74LCX374MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX374MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX374MTR?
74LCX374MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX374MTR 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 74LCX374MTR?
For technical support, including 74LCX374MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX374MTR requirements.
6.How does Aetrix verify that 74LCX374MTR is sourced from the original manufacturer or authorized distributors?
All 74LCX374MTR 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 74LCX374MTR meets industry standards.
7.What is the process for return or replacement of 74LCX374MTR?
All 74LCX374MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX374MTR, 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 74LCX374MTR part is unused and in its original packaging.
Return procedure for 74LCX374MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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