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STMicroelectronics 74LVC374ATTR
- Part No.:
- 74LVC374ATTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVC374ATTR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,412
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Product details
Overview
74LVC374ATTR from STMicroelectronics is an octal D-type flip-flop with 3-state non-inverting outputs, designed for voltage-level translation between 5 V and 3.3 V systems. It features 1.65–3.6 V operating supply, 6.8 ns max propagation delay at 3 V, ±24 mA output drive, and 5 V-tolerant inputs - used in bus interface, data latching, and memory address registration in industrial control and embedded peripherals.
For engineers reviewing the 74LVC374ATTR datasheet, 74LVC374ATTR pinout, 74LVC374ATTR application, or 74LVC374ATTR equivalent, key selection criteria include 3-state output timing control, input voltage tolerance across mixed-supply domains, symmetrical drive strength, and latch-up immunity exceeding 500 mA per JESD17.
Technical Context
This device implements eight edge-triggered D-type latches synchronized to the rising edge of CK, with independent 3-state control via active-low OE. Internal operation continues regardless of OE state - enabling data retention or update while outputs are high-impedance.
Its sub-micron C2MOS process delivers balanced tPLH ≅ tPHL propagation delays, 2 kV HBM ESD protection, and power-down input/output protection allowing 0–7 V input voltages irrespective of VCC - critical for hot-swap and mixed-voltage board interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 3.6 V - supports single-supply operation in 1.8 V, 2.5 V, and 3.3 V logic domains |
| Max Propagation Delay | 6.8 ns at VCC = 3.0 V - enables reliable 100+ MHz clock domain interfacing |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - drives standard PCI-bus loads and multiple CMOS inputs |
| Input Voltage Tolerance | 0 V to 5.5 V - allows direct connection to 5 V TTL/CMOS without level shifters |
| Latch-Up Immunity | >500 mA per JESD17 - ensures robustness against transient ground bounce or supply faults |
| ESD Protection | HBM >2000 V, MM >200 V - meets industrial IEC 61000-4-2 system-level surge requirements |
Pinout & Package
TSSOP-20 package (6.5 mm × 4.4 mm, 0.65 mm pitch), thin shrink small outline with exposed pad not present; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low 3-state output enable | Asserting low enables Q0–Q7; high places all outputs in high-impedance - decouples bus loading during arbitration |
| 2,5,6,9,12,15,16,19 (Q0–Q7) | Non-inverting 3-state outputs | Reflect D-input state on CK rising edge; high-Z when OE high - prevents bus contention |
| 3,4,7,8,13,14,17,18 (D0–D7) | Data inputs | Sampled on CK rising edge; 5 V tolerant - accepts upstream 5 V logic without clamping diodes |
| 11 (CK) | Clock input | Rising-edge triggered; Schmitt-triggered input not specified - requires clean monotonic edges |
| 10 (GND) | Ground reference | Primary return path for all I/O and core logic; separate from VCC decoupling plane |
| 20 (VCC) | Positive supply | Supplies internal logic and output drivers; must be bypassed locally with ≤100 nF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-tolerant inputs | Accepts 0–5.5 V signals at D, CK, and OE while powered from 1.65–3.6 V - eliminates external level translators in mixed-voltage backplanes |
| Symmetrical output drive | |IOH| = IOL = 24 mA minimum at 3.0 V - ensures matched rise/fall times and reduced signal skew across all eight outputs |
| Power-down protection | Inputs and outputs remain protected at VCC = 0 V - prevents back-driving or latch-up during power sequencing |
| Balanced propagation delays | tPLH ≅ tPHL - minimizes duty-cycle distortion in clocked data paths and simplifies timing closure |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Address Latch |
|---|---|
Use Scenario: Isolating 5 V legacy I/O modules from a 3.3 V ARM-based controller in programmable logic controllers. IC Role / Device Role / Timing Role: Octal D-flip-flop acting as bidirectional data latch and bus buffer, synchronizing asynchronous module reads/writes to the CPU clock domain. Use Value: 5 V-tolerant inputs eliminate discrete level-shifter ICs; 3-state outputs prevent contention during multi-master arbitration on shared data bus. | Use Scenario: Capturing 8-bit address segments from a microcontroller's multiplexed AD bus before accessing external SRAM or peripheral registers. IC Role / Device Role / Timing Role: Edge-triggered address latch holding stable A0–A7 during memory access cycles, controlled by ALE or similar strobe. Use Value: 6.8 ns max tPD ensures setup time margin for ≥100 MHz MCU buses; symmetrical drive maintains signal integrity across PCB traces. |
| PCI-Compatible Peripheral Bridge | Test Equipment Digital Pattern Generator |
Use Scenario: Interfacing a 3.3 V FPGA to legacy 5 V PCI slots in instrumentation chassis where strict 24 mA drive compliance is required. IC Role / Device Role / Timing Role: Level-translating octal latch providing PCI bus-level signaling (VIH/VIL, VOH/VOL) while meeting PCI electrical specs. Use Value: Guaranteed 24 mA drive at 3.0 V satisfies PCI bus loading requirements; balanced tPLH/tPHL reduces jitter in address/data strobes. | Use Scenario: Generating synchronized 8-bit digital stimulus waveforms in automated test equipment with precise timing control and channel isolation. IC Role / Device Role / Timing Role: Clock-domain synchronizer capturing parallel pattern data from a high-speed DAC or waveform memory, gated by system trigger. Use Value: Independent OE control allows dynamic channel masking; high-impedance outputs prevent loading of downstream comparators or DUT inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch with 3-state outputs applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC374APWR | TI part; identical pinout and AC specs, but IOH/IOL = ±24 mA guaranteed only at VCC ≥ 2.7 V (vs. ST's 1.65 V min guarantee) | Less suitable for 1.8 V operation; same 5 V input tolerance and latch-up rating | Select if sourcing from TI-authorized channels; verify 1.8 V timing margins in final design |
| 74ALVC374MTCX | ON Semiconductor part; faster tPD = 4.2 ns typical at 3.3 V, but lower ESD rating (HBM = 2 kV vs. ST's >2 kV) and no JESD17 latch-up data published | Better for high-speed timing-critical paths; less validated for harsh industrial environments | Prefer for consumer-grade high-frequency designs where ESD/latch-up robustness is secondary |
Compared with SN74LVC374APWR and 74ALVC374MTCX, the 74LVC374ATTR provides broader voltage-range assurance (1.65 V min), documented JESD17 latch-up immunity, and consistent 5 V-tolerant behavior across full temperature range - making it preferred for industrial power-up sequencing and mixed-voltage reliability.
Availability
74LVC374ATTR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, embedded microcontroller address latching, and PCI-compatible peripheral bridging requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for 74LVC374ATTR 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, delivering silicon solutions for automotive, industrial, and embedded applications with emphasis on reliability and longevity.
The 74LVC series targets low-voltage, high-speed logic interoperability across mixed-supply systems - specifically engineered for voltage translation, bus buffering, and data synchronization in industrial control and communications infrastructure.
FAQ
Can 74LVC374ATTR operate reliably at 1.65 V supply?
Yes - the datasheet guarantees full functionality including tPD ≤ 7.8 ns, VIH/VIL thresholds, and ±4 mA output drive at VCC = 1.65 V. All DC and AC parameters are specified down to this minimum, and power-down protection remains active even at 0 V supply, supporting robust low-voltage startup sequences.
What is the maximum clock frequency supported?
The device does not specify a maximum clock frequency directly, but with 6.8 ns max tPD at 3.0 V and setup/hold times of 2 ns and 1.5 ns respectively, it supports reliable operation up to approximately 100 MHz in well-terminated, low-skew layouts - confirmed by AC characterization at fIN = 10 MHz and waveform testing up to 100 MHz.
Is the 74LVC374ATTR pin-compatible with standard 74HC374?
Yes - it is pin- and function-compatible with 74-series 374 devices including 74HC374 and 74HCT374, sharing identical TSSOP-20 pinout, D/Q/OE/CK assignments, and truth table behavior. However, it differs in supply range (1.65–3.6 V vs. 2–6 V) and 5 V input tolerance - enabling drop-in replacement where voltage scaling is needed.
Does OE affect internal latch state during high-impedance mode?
No - OE controls only output driver enablement and has no effect on internal flip-flop operation. Data can be updated on each CK rising edge or retained indefinitely while OE is high; Q outputs go high-Z, but stored state remains intact and immediately visible when OE is reasserted low.
74LVC374ATTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
- Max Propagation Delay @ V, Max CL:
- 8.2ns @ 3.3V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Current - Quiescent (Iq):
- 10 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVC374ATTR FAQ
1.How can I place an order for 74LVC374ATTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC374ATTR 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 74LVC374ATTR reliable?
The price and inventory of 74LVC374ATTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC374ATTR is usually 5 days.
3.What payment methods are accepted for 74LVC374ATTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC374ATTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVC374ATTR?
74LVC374ATTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC374ATTR 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 74LVC374ATTR?
For technical support, including 74LVC374ATTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC374ATTR requirements.
6.How does Aetrix verify that 74LVC374ATTR is sourced from the original manufacturer or authorized distributors?
All 74LVC374ATTR 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 74LVC374ATTR meets industry standards.
7.What is the process for return or replacement of 74LVC374ATTR?
All 74LVC374ATTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC374ATTR, 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 74LVC374ATTR part is unused and in its original packaging.
Return procedure for 74LVC374ATTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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