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Texas Instruments SN74ALVCH374N
- Part No.:
- SN74ALVCH374N
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ALVCH374N.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,446
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Product details
Overview
SN74ALVCH374N 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 inputs eliminating external resistors, and latch-up immunity exceeding 100 mA per JESD 78 Class II - ideal for bidirectional bus driving and I/O port buffering in low-voltage digital systems.
For engineers reviewing the SN74ALVCH374N datasheet, SN74ALVCH374N pinout, SN74ALVCH374N application, or SN74ALVCH374N equivalent, key selection considerations include its 20-pin PDIP package, 3-state output control via OE, positive-edge clocking behavior, bus-hold functionality, and compatibility with mixed-voltage 1.8 V/2.5 V/3.3 V system interfaces.
Technical Context
This device implements eight independent D-type latches synchronized to the rising edge of CLK, with each Q output reflecting the corresponding D input state after clock transition. Internal bus-hold circuitry actively maintains valid logic levels on undriven data inputs without external components.
The buffered OE input controls all eight outputs simultaneously, placing them in high-impedance (Z) state without affecting internal latch operation - enabling concurrent data retention or update while outputs are disabled. Timing parameters are fully characterized across 1.65 V–3.6 V supply range, with tpd as low as 3.6 ns at 3.3 V and setup/hold times down to 1.8 ns/0.5 ns respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65 V to 3.6 V - supports direct interface with 1.8 V, 2.5 V, and 3.3 V logic families without level shifters. |
| Max Propagation Delay | 3.6 ns at 3.3 V - enables reliable operation up to 150 MHz clock frequency in high-speed data paths. |
| Output Drive Strength | ±24 mA at 3.3 V - sufficient to drive multiple LVTTL loads or terminate short PCB traces without external buffers. |
| Bus-Hold Current | ±75 µA at 3 V - actively retains input state during floating conditions, removing need for pullup/pulldown resistors. |
| Latch-Up Immunity | >100 mA per JESD 78 Class II - ensures robustness against transient current injection in noisy industrial environments. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets stringent electrostatic discharge requirements for handling and assembly. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and communications equipment. |
Pinout & Package
SN74ALVCH374N uses a 20-pin plastic dual in-line package (PDIP-N), 6.35 mm pitch, 24.2 mm body length, 6.9 mm body width, and 4.57 mm maximum height per TI package drawing N020A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control for all eight 3-state outputs; high-impedance when asserted (low), normal logic state when deasserted (high). |
| 2–9 | 1Q–8Q (Outputs) | Octal registered outputs; each reflects corresponding D input sampled on CLK rising edge when OE is inactive. |
| 10 | GND | Ground reference for all internal circuitry and output drivers. |
| 11 | VCC | Primary power supply (1.65–3.6 V); powers logic core and output drivers. |
| 12–19 | 1D–8D (Data Inputs) | Eight asynchronous data inputs with integrated bus-hold; retain last valid logic state when un-driven. |
| 20 | CLK | Clock input triggering register update on rising edge; synchronous sampling point for all eight D inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 1.65 V–3.6 V operation enables seamless integration into mixed-voltage systems without voltage translation. |
| Bus-Hold Inputs | Eliminates external pullup/pulldown resistors on D inputs, reducing BOM count and board space in bus-interface applications. |
| High-Drive 3-State Outputs | ±24 mA drive capability at 3.3 V supports direct connection to heavily loaded data buses or backplane traces. |
| Low Propagation Delay | 3.6 ns max tpd at 3.3 V allows use in timing-critical register stages up to 150 MHz clock rates. |
| Latch-Up Immunity | Exceeds 100 mA per JESD 78 Class II, ensuring reliability in electrically noisy industrial control and instrumentation systems. |
Applications
| Industrial PLC I/O Modules | Memory Interface Buffers |
|---|---|
|
Use Scenario: Isolating microcontroller GPIO from ruggedized field I/O lines subject to EMI and voltage transients. IC Role / Device Role / Timing Role: Octal D-flip-flop acting as synchronized output latch and 3-state bus driver between MCU and opto-isolated relay/digital input banks. Use Value: Bus-hold prevents floating inputs during hot-swap events; ±24 mA drive directly drives LED indicators and small solenoid loads without buffer ICs. |
Use Scenario: Interfacing FPGA memory controllers to parallel SRAM or flash devices with shared address/data buses. IC Role / Device Role / Timing Role: Registered bus transceiver providing edge-aligned data capture and controlled bus release via OE during read/write cycles. Use Value: 3.6 ns tpd ensures setup/hold timing margins at 100+ MHz bus speeds; 3-state outputs prevent contention during memory access arbitration. |
| Automotive Body Control Units | Test Equipment Digital Pattern Generators |
|
Use Scenario: Managing discrete sensor inputs and actuator outputs in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Input register capturing switch states on CLK edge, with OE-controlled output staging to PWM dimming circuits or CAN transceiver enable lines. Use Value: −40°C to +85°C rating matches automotive under-hood temperature range; latch-up immunity protects against load-dump induced faults. |
Use Scenario: Generating precise, synchronized digital stimulus waveforms for IC functional testing and boundary-scan validation. IC Role / Device Role / Timing Role: Clock-domain synchronizer and pattern storage element feeding high-speed DACs or FPGA-based waveform engines. Use Value: Sub-4 ns propagation delay enables nanosecond-level timing resolution; bus-hold preserves test vector integrity during signal transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC374APW | Lower drive (±24 mA only at 3.3 V, reduced at 1.8 V); no bus-hold; 1.65–3.6 V range identical. | Requires external pullups on unused inputs; less suitable for floating-bus environments like hot-pluggable modules. | Preferred where cost optimization outweighs bus-hold requirement and layout allows discrete resistors. |
| 74AVC374PW | Higher speed (2.3 ns tpd at 3.3 V); same bus-hold and voltage range; slightly higher ICC (15 µA vs 10 µA). | Better suited for ultra-high-speed test fixtures or FPGA interconnect where sub-3 ns timing is critical. | Select when minimum propagation delay is prioritized over quiescent current in high-frequency digital test systems. |
Compared with SN74LVC374APW and 74AVC374PW, the SN74ALVCH374N uniquely combines bus-hold functionality, industrial temperature range, and robust latch-up immunity - making it optimal for noise-prone embedded control applications where input stability and fault tolerance are non-negotiable.
Availability
SN74ALVCH374N is available at Aetrix Electronics and suitable for industrial PLC I/O modules, memory interface buffers, automotive body control units, and digital test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74ALVCH374N 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 decades of experience in high-reliability logic and interface solutions.
The SN74ALVCH374N belongs to TI's ALVC/ALVCH advanced low-voltage CMOS logic family, engineered for high-speed, low-power, mixed-voltage system interfacing in industrial, automotive, and communications infrastructure.
FAQ
What is the recommended power-up sequence for SN74ALVCH374N to ensure outputs remain in high-impedance state?
To guarantee high-impedance outputs during power-up, tie OE to VCC through a pullup resistor. TI specifies minimum resistance based on driver sink capability - typically 10 kΩ suffices for most applications. This prevents bus contention before system firmware initializes the clock and data lines. The SN74ALVCH374N does not include internal power-on reset, so external OE biasing is mandatory for fail-safe startup behavior in the SN74ALVCH374N.
Does SN74ALVCH374N support hot-swap operation on live data buses?
Yes - the SN74ALVCH374N supports hot-swap due to its bus-hold inputs, which maintain valid logic states on undriven D pins, and its 3-state outputs controllable independently of internal register activity via OE. Combined with ±100 mA latch-up immunity and 2000-V HBM ESD rating, the SN74ALVCH374N safely withstands insertion into powered-backplane systems without disrupting adjacent devices or corrupting bus data.
Can SN74ALVCH374N operate reliably at 1.65 V supply while driving 24 mA loads?
No - output drive strength scales with VCC. At 1.65 V, SN74ALVCH374N delivers ±4 mA (IOL/IOH), not ±24 mA. The ±24 mA specification applies only at VCC = 3.0 V or 3.3 V. For 1.65 V operation, consult the Electrical Characteristics table: IOH = –4 mA at 1.65 V yields VOH ≥ 1.2 V, confirming functional compatibility with 1.8 V logic thresholds but not full-drive capability. Always verify VOL/VOH margins against receiver VIH/VIL at actual operating VCC in the SN74ALVCH374N design.
How does bus-hold functionality interact with externally pulled inputs on SN74ALVCH374N?
Texas Instruments explicitly advises against using pullup or pulldown resistors with bus-hold enabled - doing so creates contention and increases static current. The SN74ALVCH374N bus-hold circuitry provides ~75 µA holding current at 3 V, sufficient to override typical leakage but insufficient to overcome standard 10 kΩ resistors. If external biasing is required, disable bus-hold by selecting a variant without it (e.g., SN74LVC374A), as mixing both on the same input degrades noise margin and increases power in the SN74ALVCH374N.
Is SN74ALVCH374N pin-compatible with other 20-pin octal D-flip-flops like SN74ACT374N?
No - while both are 20-pin PDIP octal D-flip-flops with 3-state outputs, SN74ALVCH374N and SN74ACT374N differ in pin mapping: SN74ACT374N places CLK on pin 11 and VCC on pin 20, whereas SN74ALVCH374N has VCC on pin 11 and CLK on pin 20. This inversion makes them incompatible without PCB redesign. Always verify pinout diagrams from official TI datasheets before substitution - the SN74ALVCH374N pin assignment is fixed per SCES118G Figure 1.
SN74ALVCH374N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ALVCH374N FAQ
1.How can I place an order for SN74ALVCH374N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH374N 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 SN74ALVCH374N reliable?
The price and inventory of SN74ALVCH374N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH374N is usually 5 days.
3.What payment methods are accepted for SN74ALVCH374N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH374N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVCH374N?
SN74ALVCH374N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH374N 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 SN74ALVCH374N?
For technical support, including SN74ALVCH374N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH374N requirements.
6.How does Aetrix verify that SN74ALVCH374N is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH374N 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 SN74ALVCH374N meets industry standards.
7.What is the process for return or replacement of SN74ALVCH374N?
All SN74ALVCH374N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH374N, 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 SN74ALVCH374N part is unused and in its original packaging.
Return procedure for SN74ALVCH374N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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