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Texas Instruments SN74ALVCH374DWRE4
- Part No.:
- SN74ALVCH374DWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVCH374DWRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,730
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Product details
Overview
SN74ALVCH374DWRE4 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 SN74ALVCH374DWRE4 datasheet, SN74ALVCH374DWRE4 pinout, SN74ALVCH374DWRE4 application, or SN74ALVCH374DWRE4 equivalent, key selection criteria include its 20-pin SOIC (DW) package, 3-state output control via OE, edge-triggered latch behavior, and compatibility with mixed-voltage I/O interfaces in industrial and embedded logic designs.
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 in high-impedance mode without affecting internal latch state retention.
Bus-hold circuitry actively maintains valid logic levels on undriven D inputs, eliminating external pullup/pulldown resistors. The design supports hot-swap capability when OE is pulled up to VCC during power sequencing, ensuring outputs remain high-Z until supply stabilizes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 3.6 V - Enables interoperability with 1.8-V, 2.5-V, and 3.3-V logic domains |
| Max Propagation Delay (tpd) | 3.6 ns at 3.3 V - Supports clock frequencies up to 150 MHz in timing-critical paths |
| Output Drive Strength | ±24 mA at 3.3 V - Sufficient to directly drive multiple LVTTL or ALVC loads without buffers |
| Input Bus-Hold Current | ±25 µA to ±75 µA depending on VCC - Maintains stable logic states on floating D inputs without external resistors |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and automation applications |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets JESD22 standards for robust board-level handling |
| Latch-Up Immunity | >100 mA per JESD78 Class II - Ensures reliability under transient overvoltage conditions |
Pinout & Package
SN74ALVCH374DWRE4 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body size, 2.65 mm max height, with 1.27 mm lead pitch and gull-wing leads. RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control for all eight outputs; asserts high-impedance state when high |
| 2–9 | 1D–8D | Data inputs sampled on CLK rising edge; feature integrated bus-hold circuitry |
| 10 | GND | Ground reference for logic and power domains |
| 11 | VCC | Primary supply rail (1.65 V–3.6 V); decoupling required near pin |
| 12–19 | 1Q–8Q | 3-state outputs reflecting latched D values; drive strength configurable by VCC |
| 20 | CLK | Global positive-edge clock input; synchronizes all eight flip-flops simultaneously |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 1.65 V–3.6 V operation enables direct interface between 1.8-V microcontrollers and 3.3-V peripherals |
| Bus-Hold Inputs | Eliminates need for external pullup/pulldown resistors on D lines, reducing BOM count and PCB area |
| High-Drive Outputs | ±24-mA drive at 3.3 V supports fanout of ≥10 LVTTL loads without signal degradation |
| Hot-Swap Ready | OE-controlled high-Z outputs prevent bus contention during power-up/down sequences |
| Low Dynamic Power | Typical ICC = 10 µA at 3.6 V; ∆ICC = 750 µA per switching input - minimizes standby and active power |
Applications
| Industrial PLC I/O Expansion | Low-Voltage FPGA Interface Buffer |
|---|---|
Use Scenario: Isolating and latching sensor input signals in programmable logic controller backplanes operating at 2.5 V or 3.3 V. IC Role / Device Role / Timing Role: Acts as an octal input register, capturing parallel sensor data on CLK edge and presenting it to the PLC CPU via 3-state outputs. Use Value: Bus-hold inputs prevent floating states from unconnected channels; 3-state outputs allow shared data bus access among multiple modules. |
Use Scenario: Providing level-shifted, edge-aligned data staging between a 1.8-V FPGA I/O bank and 3.3-V peripheral memory or ADC interface. IC Role / Device Role / Timing Role: Functions as a voltage-tolerant D-flip-flop array, synchronizing asynchronous peripheral data into the FPGA clock domain. Use Value: Single-supply operation eliminates level translators; ±24-mA drive ensures clean signal integrity across 10-cm PCB traces. |
| Embedded Microcontroller Parallel Port Extender | Legacy Bus Signal Regeneration |
Use Scenario: Expanding GPIO count on resource-constrained ARM Cortex-M microcontrollers using parallel address/data multiplexing. IC Role / Device Role / Timing Role: Serves as an output latch for driving external peripherals (e.g., LCD controllers, LED matrices) with precise timing control via OE and CLK. Use Value: OE allows dynamic bus sharing; fast 3.6 ns tpd preserves setup/hold margins in high-speed parallel transfers. |
Use Scenario: Re-timing and regenerating degraded signals on aging ISA or PC/104 bus segments exposed to noise and trace loss. IC Role / Device Role / Timing Role: Operates as a clean, low-jitter octal register that restores signal edges and drives long stubs with strong current sourcing/sinking. Use Value: High drive strength and tight propagation delay matching (≤0.5 ns skew across Q outputs) reduce intersymbol interference. |
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; degrades to ±12 mA at 1.8 V), no bus-hold | Requires external pullups on unused D inputs; less suitable for sparse-bus or hot-swap use cases | Preferred where cost sensitivity outweighs bus-hold convenience and mixed-voltage flexibility |
| 74AVC374PW | Wider VCC range (1.2 V–3.6 V), higher speed (2.1 ns tpd at 3.3 V), but no bus-hold | Supports 1.2-V core logic interfacing; lacks passive input stabilization for intermittent connections | Best for ultra-low-voltage, high-frequency designs where external biasing is acceptable |
Compared with SN74ALVCH374DWRE4, SN74LVC374APWR offers lower cost but requires external biasing and has reduced drive below 3.3 V, while 74AVC374PW delivers faster timing and broader voltage support but removes bus-hold - making SN74ALVCH374DWRE4 optimal for robust, maintenance-free industrial I/O expansion.
Availability
SN74ALVCH374DWRE4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, low-voltage FPGA interface buffering, and embedded microcontroller parallel port extension requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74ALVCH374DWRE4 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 logic solutions, with decades of expertise in high-reliability industrial and automotive IC design.
SN74ALVCH374DWRE4 belongs to TI's ALVCH advanced low-voltage CMOS logic family, engineered for low-power, high-speed, mixed-voltage digital interfacing in space-constrained industrial and communications equipment.
FAQ
What is the recommended power-up sequence for SN74ALVCH374DWRE4?
TI recommends tying OE to VCC through a pullup resistor during power-up to ensure outputs remain in high-impedance state until VCC stabilizes. For SN74ALVCH374DWRE4, a 10-kΩ resistor suffices given its OE input leakage of ±5 µA at 3.6 V. This prevents bus contention before system clocks and controllers are active.
Does SN74ALVCH374DWRE4 support hot-swap insertion into a live backplane?
Yes - SN74ALVCH374DWRE4 supports hot-swap operation when OE is held high during insertion. Its bus-hold inputs maintain valid logic states on unconnected D pins, and 3-state outputs avoid driving the bus until OE is asserted low. TI confirms this behavior in Application Report SCBA004 for slow/floating CMOS inputs.
Can SN74ALVCH374DWRE4 operate reliably at 1.65 V with full timing specifications?
Yes - SN74ALVCH374DWRE4 is fully characterized down to 1.65 V. At this minimum VCC, tpd is 6.4 ns (max), fmax is 100 MHz, and output drive remains ±4 mA (IOL/IOH). All AC and DC parameters in the datasheet SCES118G are guaranteed across the full 1.65 V–3.6 V range.
How does the bus-hold circuitry in SN74ALVCH374DWRE4 affect input threshold voltage?
The bus-hold circuitry in SN74ALVCH374DWRE4 does not alter nominal VIH/VIL thresholds - they remain VCC-dependent (e.g., VIH = 0.65×VCC at 1.65 V). Instead, it provides weak feedback (~25–75 µA) to retain the last valid logic state. TI explicitly warns against combining bus-hold with external pullups, as competing currents may cause metastability.
Is SN74ALVCH374DWRE4 pin-compatible with older SN74ALS374 or SN74AS374 devices?
No - SN74ALVCH374DWRE4 is not pin-compatible with SN74ALS374 or SN74AS374. While all are 20-pin octal D-flip-flops, ALS/AS versions use different pinouts (e.g., CLK on Pin 11 vs. Pin 20) and lack OE on Pin 1. SN74ALVCH374DWRE4 follows the modern ALVC/ALVCH layout with OE on Pin 1 and CLK on Pin 20, as shown in the DW package top view.
SN74ALVCH374DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
SN74ALVCH374DWRE4 FAQ
1.How can I place an order for SN74ALVCH374DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH374DWRE4 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 SN74ALVCH374DWRE4 reliable?
The price and inventory of SN74ALVCH374DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH374DWRE4 is usually 5 days.
3.What payment methods are accepted for SN74ALVCH374DWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH374DWRE4 transactions.
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4.How is shipping managed for SN74ALVCH374DWRE4?
SN74ALVCH374DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH374DWRE4 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 SN74ALVCH374DWRE4?
For technical support, including SN74ALVCH374DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH374DWRE4 requirements.
6.How does Aetrix verify that SN74ALVCH374DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH374DWRE4 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 SN74ALVCH374DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74ALVCH374DWRE4?
All SN74ALVCH374DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH374DWRE4, 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 SN74ALVCH374DWRE4 part is unused and in its original packaging.
Return procedure for SN74ALVCH374DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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