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Texas Instruments SN74HCT377DWR
- Part No.:
- SN74HCT377DWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT377DWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,116
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Product details
Overview
SN74HCT377DWR from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with latched clock enable (CLKEN), operating at 4.5 V to 5.5 V, delivering 12 ns typical propagation delay, ±4-mA output drive at 5 V, and low 80-µA max ICC. It serves as a storage register in synchronous digital systems requiring edge-triggered data capture with glitch-immune clock gating.
For engineers reviewing the SN74HCT377DWR datasheet, SN74HCT377DWR pinout, SN74HCT377DWR application, or SN74HCT377DWR equivalent, key selection criteria include TTL-compatible inputs, single-rail outputs, latched CLKEN architecture for false-clocking immunity, and SOIC-20 packaging suitable for industrial control and data acquisition PCBs.
Technical Context
The SN74HCT377DWR implements eight independent D-type flip-flops sharing a common clock (CLK) and latched clock-enable (CLKEN) input. Each flip-flop transfers data from D to Q on the positive-going edge of CLK only when CLKEN is low, with CLKEN sampled and held to prevent metastability-induced spurious triggering.
Its HCT logic family ensures TTL-voltage compatibility (VIH = 2 V, VIL = 0.8 V) while maintaining CMOS power efficiency. Input clamp current is ±20 mA, output drive supports up to 10 LSTTL loads, and timing parameters are specified for CL = 50 pF across –40°C to 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across standard 5-V rail tolerances without level-shifting. |
| Propagation Delay (tpd) | 12 ns typical at 5.5 V - Enables reliable 22-MHz clock operation in high-speed register applications. |
| Output Drive | ±4 mA at 5 V - Directly interfaces with 10 LSTTL loads without buffer amplification. |
| Input Current | 1 µA max - Minimizes loading on upstream logic and reduces static power in large fan-out networks. |
| Logic Family | HCT - Provides TTL-input thresholds with CMOS power efficiency and noise immunity. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control and instrumentation environments. |
| Power Consumption (ICC) | 80 µA max - Supports low-quiescent-power system design without sacrificing speed. |
Pinout & Package
SN74HCT377DWR is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, 2.65 mm max height, RoHS-compliant with NIPDAU lead finish and JEDEC MS-013 registration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKEN | Latched clock-enable input; must be stable before CLK edge to avoid false triggering. |
| 2–9, 11–18 | D1–D8 / Q1–Q8 | Eight independent data inputs and complementary single-rail outputs (no Q̅). |
| 10 | GND | Ground reference for all internal circuitry and I/O. |
| 20 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor required within 10 mm. |
| 19 | CLK | Positive-edge-triggered clock input; timing critical for setup/hold compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Latched CLKEN | Eliminates sensitivity to CLKEN glitches during clock transitions, enabling robust clock gating in noisy environments. |
| TTL-Compatible Inputs | Accepts standard TTL voltage levels (VIH ≥ 2 V, VIL ≤ 0.8 V) without external biasing or level shifters. |
| Single-Rail Outputs | Provides only true Q outputs (no inverted Q̅), simplifying PCB routing and reducing trace count in register files. |
| Low ICC | 80 µA maximum quiescent current enables use in power-constrained industrial modules with multiple register stages. |
| 10-LSTTL Load Drive | Supports direct fan-out to legacy TTL logic families, avoiding intermediate buffers in mixed-technology systems. |
Applications
| Industrial PLC I/O Expansion | Data Acquisition Buffering |
|---|---|
|
Use Scenario: Capturing parallel sensor readings from analog front-end multiplexers before serial transmission to a microcontroller. IC Role / Device Role / Timing Role: Synchronous data latch holding 8-bit samples aligned to a system clock edge with gated enable per acquisition cycle. Use Value: Prevents metastability and sampling skew across channels using a single shared CLK and latched CLKEN for deterministic capture windows. |
Use Scenario: Isolating high-speed ADC output buses from processor bus contention during burst reads. IC Role / Device Role / Timing Role: Output register buffering digitized samples to decouple ADC timing from CPU read cycles. Use Value: Enables asynchronous interface between 22-MHz sampling clocks and slower processor bus timing via edge-triggered hold. |
| Programmable Logic Control Registers | Legacy Bus Interface Latching |
|
Use Scenario: Holding configuration bits for FPGA or CPLD I/O banks controlled by a host microcontroller over a parallel control bus. IC Role / Device Role / Timing Role: Non-volatile storage register updated only when CLKEN is asserted, preventing accidental reconfiguration. Use Value: Latched CLKEN ensures register updates occur exclusively during intentional write windows, eliminating spurious changes from noise. |
Use Scenario: Interfacing modern microcontrollers with legacy 8-bit ISA or parallel printer ports requiring strobed data capture. IC Role / Device Role / Timing Role: Edge-triggered latch capturing 8-bit data on STB# assertion synchronized to system clock. Use Value: TTL-compatible inputs and 12-ns tpd meet tight setup/hold requirements of legacy bus protocols without added timing margin. |
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 |
|---|---|---|---|
| SN74HCT273DWR | Includes asynchronous master clear (CLR̅); no latched CLKEN - uses simple active-low clock enable. | Requires external gating for clock-enable functionality; less immune to CLKEN noise. | Select when system-level reset coordination is needed and CLKEN noise immunity is secondary. |
| 74ACT377SCX | ACT family: higher speed (25 MHz max), 5-V only, ±24-mA drive, but higher ICC (2 µA typ) and no latched CLKEN. | Not drop-in compatible due to different input thresholds (VIH = 3.5 V) and absence of CLKEN latching. | Choose for higher-speed designs where TTL compatibility is not required and layout allows discrete CLKEN filtering. |
Compared with SN74HCT273DWR and 74ACT377SCX, the SN74HCT377DWR uniquely combines latched clock-enable architecture with TTL input compatibility and industrial temperature range - making it optimal for noise-prone control register applications where false-clocking must be eliminated at the device level.
Availability
SN74HCT377DWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, data acquisition buffering, programmable logic control registers, and legacy bus interface latching requiring stable component supply and long-term production continuity.
Supply support for SN74HCT377DWR 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications portfolio coverage.
The SN74HCT377DWR belongs to TI's HCT logic family, designed specifically for 5-V systems requiring TTL-compatible interfacing with CMOS power efficiency and robust noise immunity in industrial control and instrumentation.
FAQ
What is the maximum clock frequency supported by the SN74HCT377DWR?
The SN74HCT377DWR supports a maximum clock frequency of 22 MHz at VCC = 5.5 V and TA = 25°C, with guaranteed minimum operation up to 20 MHz across its full –40°C to +85°C industrial temperature range. This is derived from the specified tpd (12 ns typical) and pulse width requirements (tw ≥ 23 ns at 5.5 V), ensuring reliable edge-triggered operation in synchronous register applications.
Does the SN74HCT377DWR have complementary Q̅ outputs?
No, the SN74HCT377DWR provides only true Q outputs (Q1–Q8) with no complementary (Q̅) outputs. Its logic diagram and pinout confirm single-rail output structure, distinguishing it from dual-output flip-flops like the SN74HCT574. This simplifies PCB routing in applications where inverted outputs are unnecessary or generated externally.
How does the latched CLKEN function differ from a standard clock-enable input?
The SN74HCT377DWR's CLKEN input is internally latched on the preceding CLK edge, meaning its state is sampled and held before the next clock transition. This prevents false triggering caused by CLKEN glitches coinciding with CLK edges - a key reliability feature absent in non-latched alternatives like the SN74HCT273. The latch ensures only stable CLKEN states affect clock gating behavior.
Is the SN74HCT377DWR pin-compatible with the SN74HCT273DWR?
No, the SN74HCT377DWR is not pin-compatible with the SN74HCT273DWR. While both are 20-pin SOIC octal D-flip-flops, SN74HCT273DWR allocates Pin 1 to CLR̅ (asynchronous clear), whereas SN74HCT377DWR uses Pin 1 for CLKEN. Their pin functions and logic behavior differ fundamentally, requiring PCB layout revision for substitution.
What is the recommended decoupling for the SN74HCT377DWR?
A 0.1-µF ceramic capacitor placed within 10 mm of Pin 20 (VCC) and Pin 10 (GND) is recommended for the SN74HCT377DWR. This mitigates switching noise from simultaneous output transitions and maintains stable 5-V rail integrity, especially critical given its 12-ns tpd and ±4-mA drive capability. Additional bulk capacitance (e.g., 4.7 µF) may be added at the board level for multi-device supplies.
SN74HCT377DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 37 MHz
- Max Propagation Delay @ V, Max CL:
- 28ns @ 5.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HCT377DWR FAQ
1.How can I place an order for SN74HCT377DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT377DWR 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 SN74HCT377DWR reliable?
The price and inventory of SN74HCT377DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT377DWR is usually 5 days.
3.What payment methods are accepted for SN74HCT377DWR?
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SN74HCT377DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT377DWR 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 SN74HCT377DWR?
For technical support, including SN74HCT377DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT377DWR requirements.
6.How does Aetrix verify that SN74HCT377DWR is sourced from the original manufacturer or authorized distributors?
All SN74HCT377DWR 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 SN74HCT377DWR meets industry standards.
7.What is the process for return or replacement of SN74HCT377DWR?
All SN74HCT377DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT377DWR, 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 SN74HCT377DWR part is unused and in its original packaging.
Return procedure for SN74HCT377DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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