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Texas Instruments CD74HCT377M
- Part No.:
- CD74HCT377M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT377M.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:575
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Product details
Overview
CD74HCT377M from Texas Instruments is an octal D-type flip-flop with buffered common clock and data enable, operating at 4.5V–5.5V supply. It features 16 ns typical propagation delay (CL = 15 pF, VCC = 5 V, TA = 25 °C), ±25 mA output drive, and -55 °C to +125 °C temperature range-used in synchronous data latching for industrial control logic and bus interface timing circuits.
For engineers reviewing the CD74HCT377M datasheet, CD74HCT377M pinout, CD74HCT377M application, or CD74HCT377M equivalent, key selection factors include its HCT-family LSTTL-compatible inputs (VIH ≥ 2 V, VIL ≤ 0.8 V), simultaneous edge-triggered loading of eight bits, and SOIC-20 package suitability for high-reliability embedded timing systems.
Technical Context
The CD74HCT377M implements eight independent D-type flip-flops sharing a single buffered clock (CP) and a common active-low Data Enable (E). All outputs update synchronously on the rising edge of CP when E is low; otherwise, outputs hold state regardless of input changes or clock transitions.
Its HCT logic family ensures direct compatibility with legacy LSTTL signal levels while delivering CMOS power efficiency. Input thresholds are fixed (VIH min = 2 V, VIL max = 0.8 V), and output drive meets ±25 mA per pin under VCC = 4.5–5.5 V, supporting direct fanout to 10 LSTTL loads over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - enables direct interfacing with LSTTL outputs without level shifters |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V TTL/CMOS system rails |
| Propagation Delay (tPLH/tPHL) | 16 ns typical at CL = 15 pF, VCC = 5 V - supports up to 50 MHz clock operation in real-world loads |
| Operating Temperature | -55 °C to +125 °C - qualified for aerospace, automotive under-hood, and industrial environments |
| Output Drive Capability | ±25 mA per pin - sufficient to drive multiple LSTTL inputs or small capacitive loads directly |
| Input Compatibility | LSTTL-compatible VIH ≥ 2 V, VIL ≤ 0.8 V - eliminates need for external pull-ups or translators |
| Maximum Clock Frequency | 50 MHz at CL = 15 pF, VCC = 5 V - enables high-speed parallel data capture in control registers |
Pinout & Package
CD74HCT377M is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm footprint, 2.65 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1, tape-and-reel packaging (2000 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Data Enable (active low) | Enables simultaneous loading of all eight D inputs on next CP rising edge; high = hold state |
| 2–9 (D0–D7) | Data inputs | Asynchronous inputs latched only when E = low and CP rises; no internal pull-ups |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic; must be low-impedance connection |
| 11–18 (Q0–Q7) | True outputs | Edge-triggered registered outputs; retain state when E is high or CP is static |
| 19 (CP) | Clock input | Buffered rising-edge-sensitive clock; all flip-flops share this single synchronized trigger |
| 20 (VCC) | Power supply | 4.5–5.5 V DC supply; decoupling capacitor (0.1 µF) required near pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Buffered common clock (CP) | Reduces clock skew across all eight flip-flops, ensuring deterministic setup/hold timing margins |
| Active-low data enable (E) | Allows global gating of data flow without disabling clock distribution or requiring external AND logic |
| LSTTL-compatible input thresholds | Eliminates level-shifting components when interfacing with legacy 5 V TTL peripherals or microcontrollers |
| High noise immunity (NIL/NIH = 30% of VCC) | Ensures reliable operation in electrically noisy industrial environments with minimal false triggering |
| Wide temperature range (-55 °C to +125 °C) | Supports deployment in extended-range applications including avionics, motor drives, and downhole equipment |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Capturing parallel sensor status (e.g., door switches, seatbelt sensors) into a microcontroller's data bus. IC Role / Device Role / Timing Role: Synchronous latching register that freezes 8-bit status on rising edge of system clock when enable is asserted. Use Value: Prevents metastability during asynchronous switch bounce by enforcing strict edge-triggered sampling aligned to MCU clock domain. | Use Scenario: Isolating and buffering headlight, wiper, and HVAC control signals from a central body controller. IC Role / Device Role / Timing Role: Output register holding command states until next update cycle, decoupling slow software updates from real-time actuator timing. Use Value: Enables glitch-free output transitions and eliminates race conditions between software writes and hardware response timing. |
| Test Equipment Digital Pattern Generator | Avionics Data Acquisition Interface |
Use Scenario: Generating precise 8-bit stimulus patterns synchronized to a master test clock in ATE systems. IC Role / Device Role / Timing Role: Parallel pattern latch stage feeding FPGA or DAC interface, triggered by programmable clock edges. Use Value: Provides deterministic, low-jitter data alignment critical for timing-margin validation of DUT digital interfaces. | Use Scenario: Consolidating discrete analog-to-digital converter outputs (e.g., pressure, temperature) into a time-stamped digital word before transmission via ARINC 429. IC Role / Device Role / Timing Role: High-reliability data capture register meeting DO-254 design assurance requirements for airborne systems. Use Value: Delivers radiation-tolerant, wide-temperature operation without derating, supporting certified flight-critical subsystems. |
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 |
|---|---|---|---|
| SN74HCT377N | Same logic function and pinout; PDIP-20 package instead of SOIC-20; higher θJA (69 °C/W vs. 58 °C/W) | Better suited for prototyping or through-hole assembly; less suitable for high-density PCBs or automated SMT lines | Select SN74HCT377N only when manual soldering or socket-based testing is required. |
| 74ACT377SCX | Faster propagation (8 ns typ), wider VCC range (4.5–5.5 V), but higher ICC (max 80 µA vs. 160 µA at 125 °C) and no military temp rating | Optimized for speed-critical commercial systems; lacks -55 °C capability and MIL-qualified variants | Choose 74ACT377SCX where >50 MHz operation is needed and extended temperature is not required. |
Compared with SN74HCT377N and 74ACT377SCX, CD74HCT377M uniquely combines SOIC-20 surface-mount compatibility, full -55 °C to +125 °C qualification, and proven reliability in safety-critical industrial deployments-making it the preferred choice for long-lifecycle, high-availability systems.
Availability
CD74HCT377M is available at Aetrix Electronics and suitable for industrial automation, avionics data acquisition, and automotive body control applications requiring stable component supply across extended product lifecycles.
Supply support for CD74HCT377M 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 specializing in analog, embedded processing, and logic solutions for industrial, automotive, and aerospace markets.
The CD74HCT377M belongs to TI's legacy High-Speed CMOS Logic (HCT) portfolio, designed specifically for drop-in replacement of obsolete 74LS377 in mission-critical 5 V systems demanding wide temperature operation and LSTTL compatibility.
FAQ
What is the maximum clock frequency supported by CD74HCT377M?
The CD74HCT377M supports a maximum clock frequency of 50 MHz when loaded with 15 pF and operated at VCC = 5 V and TA = 25 °C. At full temperature range (-55 °C to +125 °C), the guaranteed minimum fMAX is 16 MHz per datasheet specifications, making CD74HCT377M suitable for robust timing-critical control applications across extreme environmental conditions.
Does CD74HCT377M require external pull-up resistors on its inputs?
No, CD74HCT377M does not require external pull-up resistors on its inputs. Its HCT-family inputs are designed for direct LSTTL compatibility with VIH ≥ 2 V and VIL ≤ 0.8 V, and input leakage current is limited to ±1 µA. Unused inputs should be tied to VCC or GND to prevent floating nodes, but no pull-up resistors are necessary for functional operation of CD74HCT377M.
Can CD74HCT377M operate at 3.3 V supply voltage?
No, CD74HCT377M cannot operate reliably at 3.3 V. Its specified supply range is strictly 4.5 V to 5.5 V per the HCT family definition. Attempting to power CD74HCT377M at 3.3 V will result in undefined logic behavior, failure to meet VIH/VIL thresholds, and potential output instability. For 3.3 V systems, consider TI's SN74LVC377A or similar LVC-family alternatives.
What is the meaning of the "M96.A" suffix in CD74HCT377M96.A?
The "M96.A" suffix in CD74HCT377M96.A indicates a SOIC-20 package (M), tape-and-reel packaging with 2000 units per reel (96), and a revision or manufacturing code denoted by "A". This ordering variant is active and RoHS-compliant, with NIPDAU lead finish and MSL Level-1 rating-ensuring CD74HCT377M96.A is optimized for high-volume automated SMT assembly without moisture sensitivity concerns.
How does the Data Enable (E) pin function in CD74HCT377M?
The Data Enable (E) pin on CD74HCT377M is an active-low control that gates the transfer of D0–D7 inputs to Q0–Q7 outputs. When E is low, all eight flip-flops load their respective D inputs on the next rising edge of CP. When E is high, outputs retain their current state regardless of D-input changes or CP activity-enabling synchronous data freeze without disrupting clock distribution in CD74HCT377M-based systems.
CD74HCT377M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 38ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74HCT377M FAQ
1.How can I place an order for CD74HCT377M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT377M 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 CD74HCT377M reliable?
The price and inventory of CD74HCT377M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT377M is usually 5 days.
3.What payment methods are accepted for CD74HCT377M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT377M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT377M?
CD74HCT377M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT377M 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 CD74HCT377M?
For technical support, including CD74HCT377M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT377M requirements.
6.How does Aetrix verify that CD74HCT377M is sourced from the original manufacturer or authorized distributors?
All CD74HCT377M 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 CD74HCT377M meets industry standards.
7.What is the process for return or replacement of CD74HCT377M?
All CD74HCT377M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT377M, 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 CD74HCT377M part is unused and in its original packaging.
Return procedure for CD74HCT377M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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