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Texas Instruments CD74HCT377ME4
- Part No.:
- CD74HCT377ME4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT377ME4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,378
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Product details
Overview
CD74HCT377ME4 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 operating temperature range. It is used in synchronous data latching and register applications within industrial control logic and instrumentation systems.
For engineers reviewing the CD74HCT377ME4 datasheet, CD74HCT377ME4 pinout, CD74HCT377ME4 application, or CD74HCT377ME4 equivalent, key selection criteria include its LSTTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), simultaneous positive-edge-triggered loading of eight outputs, and robust operation across extended temperature extremes without derating.
Technical Context
The CD74HCT377ME4 implements eight edge-triggered D-type flip-flops sharing a single buffered clock (CP) and a common active-low data enable (E). All Q outputs update synchronously on the rising edge of CP only when E is low - enabling precise parallel data capture in timing-critical control paths.
Its HCT logic family ensures direct compatibility with legacy TTL signal levels while delivering CMOS power efficiency. Input leakage remains ≤ ±1 µA, quiescent ICC is ≤ 160 µA over full temperature range, and it supports up to 10 LSTTL loads per output - making it suitable for bus-interface and register-file staging in mixed-logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS power efficiency, 4.5–5.5 V operation |
| Propagation Delay (tPLH/tPHL) | 16 ns typical at CL = 15 pF, VCC = 5 V - enables reliable 50 MHz clocking in register chains |
| Operating Temperature Range | -55 °C to +125 °C - qualified for aerospace, military, and under-hood automotive use |
| Output Drive Capability | ±25 mA per pin - sufficient to directly drive multiple LSTTL inputs or small capacitive loads |
| Input Thresholds | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) - ensures noise-immune interfacing with 5 V TTL sources |
| Supply Current (ICC) | ≤ 160 µA max at -55 °C to +125 °C - supports low-static-power system design |
| Set-up/Hold Times | tSU = 18 ns, tH = 3 ns (data to CP) - defines minimum data stability window before clock edge |
Pinout & Package
CD74HCT377ME4 is supplied in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.2 mm max height, with 0.65 mm lead pitch and RoHS-compliant NiPdAu finish. Moisture sensitivity level is Level-1 (unlimited floor life at <30 °C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Data Enable (active low) | Enables simultaneous loading of all eight D inputs to Q outputs on next CP rising edge |
| 2–9 (D0–D7) | Data Inputs | Asynchronous parallel data inputs; sampled only when E = low and CP rises |
| 10 (GND) | Ground Reference | Primary return path for logic and output current; must be low-impedance |
| 11–18 (Q0–Q7) | Registered Outputs | Octal edge-triggered outputs; retain state when E = high or CP inactive |
| 19 (CP) | Buffered Clock Input | Positive-edge-triggered global clock; internal buffering reduces skew across flip-flops |
| 20 (VCC) | Power Supply | 4.5–5.5 V CMOS supply; decoupling capacitor required near pin for switching noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Buffered Common Clock (CP) | Reduces clock distribution skew and improves timing margin across all eight flip-flops |
| Simultaneous Data Loading | All eight Q outputs update in one cycle when E = low - eliminates staggered register updates |
| LSTTL Input Compatibility | Accepts standard TTL voltage levels without level-shifting, simplifying interface with legacy controllers |
| Extended Temperature Operation | Guaranteed functionality from -55 °C to +125 °C - supports deployment in harsh environments |
| Low Power Consumption | Quiescent ICC ≤ 160 µA over full temp range - ideal for battery-backed or thermally constrained systems |
Applications
| Industrial PLC I/O Expansion | Automotive Engine Control Unit (ECU) Register Staging |
|---|---|
Use Scenario: Capturing sensor status bits from multiplexed analog front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronous parallel latch for 8-bit status word, synchronized to main controller clock domain. Use Value: Ensures deterministic sampling window and eliminates metastability risk via guaranteed setup/hold margins at 50 MHz operation. |
Use Scenario: Holding calibrated lookup table addresses during real-time fuel injection timing calculations. IC Role / Device Role / Timing Role: Edge-triggered register staging intermediate address values between computation and memory access stages. Use Value: Provides glitch-free address hold with 16 ns propagation delay, supporting sub-microsecond timing resolution in safety-critical engine cycles. |
| Aerospace Avionics Data Buffering | Test Equipment Digital Pattern Generation |
Use Scenario: Isolating and latching telemetry data streams from radiation-hardened ADCs prior to serial transmission. IC Role / Device Role / Timing Role: Radiation-tolerant octal latch providing single-cycle data capture aligned to system sync pulse. Use Value: Extended -55 °C to +125 °C rating and 10 LSTTL fanout support direct connection to downstream bus drivers without buffers. |
Use Scenario: Generating stable 8-bit stimulus patterns for IC functional testing under automated test equipment (ATE) control. IC Role / Device Role / Timing Role: Programmable pattern register updated synchronously with ATE clock edges for repeatable vector delivery. Use Value: Buffered CP input and tight propagation delay matching (±1 ns typical) ensure minimal inter-channel skew across all eight outputs. |
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, identical pinout, but in 20-pin PDIP (N) package; higher θJA (69 °C/W) limits high-frequency thermal performance | Suitable for prototyping and low-volume through-hole assembly; not rated for extended temperature operation beyond -40 °C to +85 °C | Select when hand-soldering or breadboarding is required; avoid in high-reliability or wide-temp deployments |
| CD74HC377M96 | Same SOIC-20 footprint but HC family: 2–6 V operation, VIH/VIL thresholds differ (VIH ≥ 3.15 V @ 4.5 V); 14 ns propagation delay | Requires level translation when interfacing with TTL sources; better suited for mixed-voltage systems with 3.3 V or 5 V domains | Choose for lower power or wider supply flexibility; verify input compatibility with driving logic before substitution |
Compared with CD74HCT377ME4, SN74HCT377N trades thermal robustness and extended temperature capability for ease of manual assembly, while CD74HC377M96 offers broader voltage operation at the cost of TTL-level input compatibility - requiring careful signal-level validation in existing designs.
Availability
CD74HCT377ME4 is available at Aetrix Electronics and suitable for industrial automation, aerospace avionics, and automotive ECU applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT377ME4 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 heritage in high-reliability logic families.
CD74HCT377ME4 belongs to TI's High-Speed CMOS Logic (HCT) product line, designed specifically for seamless integration into legacy TTL-based systems while delivering CMOS efficiency and extended environmental resilience.
FAQ
What is the maximum clock frequency supported by CD74HCT377ME4?
The CD74HCT377ME4 supports a maximum clock frequency of 25 MHz at 25 °C (VCC = 4.5–5.5 V, CL = 15 pF), derating to 16 MHz over the full -55 °C to +125 °C operating range. This is confirmed in the Switching Specifications table of the official TI datasheet SCHS184C, where fMAX is specified as 25 MHz (25 °C), 20 MHz (-40 °C to +85 °C), and 16 MHz (-55 °C to +125 °C).
Does CD74HCT377ME4 require external pull-up or pull-down resistors on its inputs?
No, CD74HCT377ME4 does not require external pull-up or pull-down resistors on its inputs. Its CMOS inputs exhibit ≤ ±1 µA leakage current (II), and the HCT family guarantees valid logic states for VI ≤ 0.8 V (low) and VI ≥ 2.0 V (high). Unused inputs should be tied to VCC or GND - not left floating - to prevent noise-induced switching and increased ICC.
Can CD74HCT377ME4 drive LED indicators directly?
CD74HCT377ME4 can drive low-current LEDs (≤ 10 mA) in sink configuration (cathode to output, anode to VCC via current-limiting resistor), leveraging its -25 mA output sink capability. However, for higher-brightness or multi-LED loads, a dedicated buffer or transistor stage is recommended to maintain output voltage compliance and avoid exceeding total ICC limits.
Is CD74HCT377ME4 pin-compatible with CD74HC377M96?
Yes, CD74HCT377ME4 and CD74HC377M96 share identical 20-pin SOIC (DW) packaging, pin assignment, and mechanical footprint. However, they are not functionally interchangeable without circuit review: CD74HC377M96 uses HC logic thresholds (VIH ≥ 3.15 V @ 4.5 V), whereas CD74HCT377ME4 accepts TTL-level inputs (VIH ≥ 2.0 V). Substitution requires verification of driving source compatibility.
What is the meaning of the "E4" suffix in CD74HCT377ME4?
The "E4" suffix in CD74HCT377ME4 is a Texas Instruments packaging and revision code indicating the device is supplied in a 20-pin SOIC (DW) package with NiPdAu lead finish, RoHS-compliant, and assembled in a TI facility meeting JESD22-A110 reliability standards. It is not a temperature grade or speed bin - the full temperature range (-55 °C to +125 °C) is defined by the base part number and is validated per the CD74HCT377M96 ordering addendum.
CD74HCT377ME4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
CD74HCT377ME4 FAQ
1.How can I place an order for CD74HCT377ME4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT377ME4 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 CD74HCT377ME4 reliable?
The price and inventory of CD74HCT377ME4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT377ME4 is usually 5 days.
3.What payment methods are accepted for CD74HCT377ME4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT377ME4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT377ME4?
CD74HCT377ME4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT377ME4 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 CD74HCT377ME4?
For technical support, including CD74HCT377ME4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT377ME4 requirements.
6.How does Aetrix verify that CD74HCT377ME4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT377ME4 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 CD74HCT377ME4 meets industry standards.
7.What is the process for return or replacement of CD74HCT377ME4?
All CD74HCT377ME4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT377ME4, 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 CD74HCT377ME4 part is unused and in its original packaging.
Return procedure for CD74HCT377ME4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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