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Texas Instruments SN74ALVCH374DBR
- Part No.:
- SN74ALVCH374DBR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALVCH374DBR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,649
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Product details
Overview
SN74ALVCH374DBR from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with 3-state outputs, designed for 1.65 V to 3.6 V operation. It features ±24-mA output drive at 3.3 V, 3.6 ns max propagation delay, bus-hold circuitry on data inputs, and operates across –40°C to 85°C. It serves as a buffer register or bidirectional bus driver in low-voltage digital systems.
For engineers reviewing the SN74ALVCH374DBR datasheet, SN74ALVCH374DBR pinout, SN74ALVCH374DBR application, or SN74ALVCH374DBR equivalent, key selection criteria include voltage compatibility (1.65–3.6 V), edge-triggered timing behavior, 3-state output control via OE, and bus-hold functionality eliminating external biasing.
Technical Context
This device implements eight independent D-type latches synchronized to the rising edge of CLK, with asynchronous 3-state control via OE. Each output can be driven high, low, or placed into high-impedance - independent of internal latch state.
Bus-hold circuitry actively maintains valid logic levels on undriven D inputs without external resistors, and latch-up performance exceeds 100 mA per JESD 78 Class II. ESD protection meets JESD 22 standards including 2000-V HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65 V to 3.6 V - supports mixed-voltage interfacing between 1.8 V, 2.5 V, and 3.3 V logic domains |
| Max Propagation Delay | 3.6 ns at 3.3 V - enables reliable operation up to 150 MHz clock frequency |
| Output Drive Strength | ±24 mA at 3.3 V - sufficient to directly drive multiple CMOS loads or short PCB traces without buffers |
| Input Bus-Hold | Integrated on all D inputs - eliminates need for external pullup/pulldown resistors and prevents floating-input glitches |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
| 3-State Enable Logic | Active-low OE - allows simultaneous high-impedance control of all eight outputs without affecting internal latch states |
Pinout & Package
SN74ALVCH374DBR is housed in a 20-pin SSOP (Shrink Small-Outline Package) with 0.65 mm lead pitch, 6.6 mm × 4.5 mm body size, and 1.2 mm max height. The package is RoHS-compliant, moisture sensitivity level 1, and rated for reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low output enable - controls all eight Q outputs simultaneously; high-impedance when high |
| 2–9 | 1D–8D | Data inputs - sampled on rising CLK edge; each has integrated bus-hold |
| 10 | GND | Ground reference - must be connected to system ground plane for noise immunity and stable operation |
| 11 | VCC | Power supply - decoupling capacitor (0.1 µF ceramic) required within 1 cm of this pin |
| 12–19 | 1Q–8Q | 3-state outputs - reflect corresponding D inputs after CLK↑; high-Z when OE = high |
| 20 | CLK | Clock input - positive-edge-triggered; requires monotonic transition and ≤2.5 ns rise/fall time at 3.3 V |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 1.65 V to 3.6 V operation enables interoperability across 1.8 V, 2.5 V, and 3.3 V subsystems without level shifters |
| High-Speed Timing | 3.6 ns tpd at 3.3 V supports 150 MHz clocking - suitable for high-throughput data buffering in FPGAs and microcontrollers |
| Integrated Bus-Hold | Eliminates external biasing components on D inputs, reducing BOM count and PCB area while preventing metastability from floating nodes |
| Robust Output Drive | ±24 mA per output at 3.3 V allows direct connection to multiple downstream CMOS gates or termination-resistor networks |
| Latch-Up Immunity | Exceeds 100 mA per JESD 78 Class II - ensures reliability in noisy industrial environments with transient coupling |
Applications
| Industrial PLC I/O Expansion | FPGA Configuration Interface |
|---|---|
Use Scenario: Expanding discrete I/O points on programmable logic controllers using parallel bus architecture. IC Role / Device Role / Timing Role: Acts as an octal output latch and input buffer, synchronizing field-side signals to the PLC's internal clock domain. Use Value: Enables deterministic sampling of sensor/actuator lines with precise edge-triggered capture and 3-state isolation during bus arbitration. |
Use Scenario: Providing configuration data and status feedback between FPGA and host controller during boot and runtime reconfiguration. IC Role / Device Role / Timing Role: Serves as a bidirectional data register - latching configuration bits from host and buffering status flags to host. Use Value: Supports hot-swap-safe communication via 3-state outputs and bus-hold inputs, preventing glitches during partial power-up sequences. |
| Memory-Mapped Peripheral Interface | Low-Voltage Bus Transceiver |
Use Scenario: Interfacing microcontroller GPIO ports to legacy parallel peripherals such as LCD controllers or ADCs with shared address/data buses. IC Role / Device Role / Timing Role: Functions as a memory-mapped I/O port expander - decoding address lines to enable OE and latching data on CLK↑. Use Value: Provides clean signal integrity across mixed-voltage interfaces (e.g., 3.3 V MCU to 2.5 V peripheral) without external level translation. |
Use Scenario: Isolating and driving bidirectional data buses between low-power SoCs and higher-drive peripherals in portable instrumentation. IC Role / Device Role / Timing Role: Operates as a direction-controlled bus driver - using OE to switch between transmit/receive modes on a single 8-bit bus. Use Value: Delivers ±24 mA drive strength at 1.8 V–3.3 V while maintaining sub-4 ns propagation, enabling compact, low-noise bus designs without external drivers. |
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 |
|---|---|---|---|
| SN74LVC374APWR | Lower drive (±24 mA only at 3.3 V; drops to ±12 mA at 1.8 V); no bus-hold; identical 20-pin TSSOP package | Requires external pullups on unused D inputs; less robust in unterminated or long-trace bus environments | Preferred where cost optimization outweighs bus-hold requirement and supply is fixed at 3.3 V |
| 74AVC374PW | Wider voltage range (1.2 V to 3.6 V); higher speed (2.4 ns tpd at 3.3 V); no bus-hold; same pinout but different marking and thermal resistance | Supports ultra-low-voltage domains (1.2 V core logic); lacks bus-hold, increasing risk of floating-input faults in sparse layouts | Chosen when interfacing with sub-1.65 V logic or requiring tighter timing margins than SN74ALVCH374DBR provides |
Compared with SN74ALVCH374DBR, SN74LVC374APWR offers lower cost but removes bus-hold protection, while 74AVC374PW extends voltage support downward to 1.2 V and improves speed - both retain pin compatibility but require layout validation for thermal and signal-integrity impact.
Availability
SN74ALVCH374DBR is available at Aetrix Electronics and suitable for industrial automation, FPGA interface design, and low-voltage bus transceiver applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74ALVCH374DBR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in high-reliability IC design and manufacturing.
The SN74ALVCH374DBR belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for high-speed, low-power, mixed-voltage digital interfacing in industrial, communications, and computing systems.
FAQ
What is the recommended power supply decoupling for SN74ALVCH374DBR?
Each SN74ALVCH374DBR requires a 0.1 µF ceramic capacitor placed within 1 cm of the VCC pin and connected to the nearest GND pin. For systems with multiple devices, add a bulk 4.7 µF tantalum or aluminum electrolytic capacitor per 5–10 ICs. This minimizes switching noise and ensures stable 3.3 V operation under ±24 mA dynamic load transitions.
Does SN74ALVCH374DBR support hot insertion or live bus connection?
SN74ALVCH374DBR supports controlled hot insertion when OE is held high (3-state) during power-up, and VCC ramps monotonically. Its absolute maximum ratings allow VI and VO to reach –0.5 V to VCC + 0.5 V, and bus-hold circuitry prevents undefined states on unconnected D inputs - making it suitable for backplane and modular I/O applications where cards are inserted under partial power.
How does the bus-hold feature affect timing parameters of SN74ALVCH374DBR?
The bus-hold circuitry on SN74ALVCH374DBR adds no measurable delay to setup/hold times (tsu = 1.8 ns, th = 0.5 ns at 3.3 V) because it operates independently of the D-input path to the latch. It draws ≤75 µA per input at 3 V and does not load the input node beyond specified Ci = 6 pF, preserving signal integrity and timing margin in high-speed routing.
Can SN74ALVCH374DBR drive standard 50 Ω transmission lines directly?
No - SN74ALVCH374DBR is not designed for 50 Ω line driving. Its output structure targets CMOS fanout (e.g., ≥10 LVTTL loads), not controlled-impedance signaling. Driving 50 Ω lines would exceed its ±24 mA rating under typical 3.3 V swing and cause excessive voltage droop and timing skew. Use dedicated line drivers (e.g., SN65LVDSxx) for such applications.
What is the maximum clock frequency supported by SN74ALVCH374DBR at 1.8 V supply?
At 1.8 V supply, SN74ALVCH374DBR supports a maximum clock frequency of 100 MHz, as confirmed by timing characterization (fclock min = 100 MHz, tw = 3.8 ns). This is limited by increased propagation delay (tpd = 6.4 ns) and reduced output drive strength (±4 mA), which affects signal rise/fall times and noise margin in dense layouts.
SN74ALVCH374DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 150 MHz
- Max Propagation Delay @ V, Max CL:
- 3.6ns @ 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:
- 5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74ALVCH374DBR FAQ
1.How can I place an order for SN74ALVCH374DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH374DBR 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 SN74ALVCH374DBR reliable?
The price and inventory of SN74ALVCH374DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH374DBR is usually 5 days.
3.What payment methods are accepted for SN74ALVCH374DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH374DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVCH374DBR?
SN74ALVCH374DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH374DBR 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 SN74ALVCH374DBR?
For technical support, including SN74ALVCH374DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH374DBR requirements.
6.How does Aetrix verify that SN74ALVCH374DBR is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH374DBR 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 SN74ALVCH374DBR meets industry standards.
7.What is the process for return or replacement of SN74ALVCH374DBR?
All SN74ALVCH374DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH374DBR, 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 SN74ALVCH374DBR part is unused and in its original packaging.
Return procedure for SN74ALVCH374DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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