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Texas Instruments CD74HCT377E
- Part No.:
- CD74HCT377E
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HCT377E.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:383
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Product details
Overview
CD74HCT377E 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 per pin, and -55 °C to +125 °C operating temperature range. It is used in synchronous data latching and register staging within industrial control logic and test equipment.
For engineers reviewing the CD74HCT377E datasheet, CD74HCT377E pinout, CD74HCT377E application, or CD74HCT377E equivalent, this page delivers verified electrical specs, validated PDIP-20 pin mapping, real-world timing constraints (tSU = 12 ns, tH = 3 ns), and two confirmed drop-in alternatives for legacy board refresh or supply continuity planning.
Technical Context
The CD74HCT377E implements eight edge-triggered D flip-flops sharing a single buffered clock (CP) input and a common active-low Data Enable (E) control. All Q outputs update synchronously on the rising edge of CP when E is low; otherwise, outputs hold state regardless of D input changes.
Its HCT logic family ensures direct compatibility with LSTTL inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) while delivering CMOS-level noise immunity and quiescent current (ICC ≤ 160 µA over full temperature range). Input loading is specified as 1.5 unit loads on E, 0.5 on CP, and 0.25 per Dn pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible input thresholds, CMOS power efficiency, 4.5–5.5 V operation |
| Propagation Delay (CP→Q) | 16 ns typical at 5 V, CL = 15 pF - determines maximum synchronous data throughput |
| Setup Time (D/E to CP) | 12 ns min at 25 °C - constrains minimum clock period in high-speed latch designs |
| Output Drive Capability | ±25 mA per pin - supports direct interfacing to 10 LSTTL loads without buffers |
| Operating Temperature | -55 °C to +125 °C - qualified for extended industrial and military-grade environments |
| Input Leakage Current | ±1 µA max at 5.5 V - negligible loading on upstream drivers or pull-up networks |
| Power Dissipation Capacitance | 35 pF - enables accurate dynamic power calculation: PD = VCC² × fi × (CPD + CL) |
Pinout & Package
CD74HCT377E is supplied in a 20-pin Plastic Dual In-line Package (PDIP), with 0.3-inch body width, 2.54 mm lead pitch, and JEDEC MS-001 compliant footprint. Thermal resistance θJA is 69 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Data Enable (active low) | Global enable controlling simultaneous load of all eight D inputs to Q outputs on next CP rise |
| 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 currents; must be low-impedance for noise control |
| 11–18 (Q0–Q7) | Registered Outputs | Edge-triggered latched outputs; retain state when E = high or CP stable |
| 19 (CP) | Buffered Clock Input | Rising-edge sensitive; internal buffer isolates clock net from capacitive loading of D/Q nets |
| 20 (VCC) | Positive Supply | 4.5–5.5 V DC; bypassing with 0.1 µF ceramic capacitor near pin required for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Buffered Common Clock (CP) | Reduces skew and fanout burden on system clock distribution network |
| Simultaneous Load Control (E) | Enables atomic 8-bit register updates without individual gating or timing mismatches |
| LSTTL-Compatible Inputs | Accepts standard TTL voltage levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) without level-shifting circuitry |
| Balanced Propagation & Transition Times | Minimizes output pulse distortion and setup/hold margin erosion in cascaded logic |
| Wide Temperature Range Support | Validated operation from -55 °C to +125 °C enables use in under-hood automotive and downhole instrumentation |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Capturing sensor status bits (e.g., door open/closed, seatbelt fastened) across multiple CAN nodes before aggregation into a master diagnostic frame. IC Role / Device Role / Timing Role: Synchronous 8-bit parallel latch aligning asynchronous mechanical switch inputs to a deterministic system clock domain. Use Value: Eliminates metastability risk during state capture and ensures glitch-free sampling at up to 16 MHz clock rate. |
Use Scenario: Staging lighting control commands (headlamp, fog lamp, turn signal states) from microcontroller GPIO before driving high-side switches. IC Role / Device Role / Timing Role: Registered interface buffer isolating MCU I/O from noisy power-switching transients and enabling precise timing of LED activation sequences. Use Value: Provides robust 25 mA sink/source per channel and guaranteed hold time (tH = 3 ns) under 125 °C ambient conditions. |
| Test Equipment Pattern Generators | Legacy Industrial Bus Interface Cards |
Use Scenario: Generating synchronized stimulus vectors for digital IC functional testing using pattern memory and sequencer logic. IC Role / Device Role / Timing Role: High-speed data register holding one byte of test vector prior to parallel output onto device-under-test bus lines. Use Value: 16 ns propagation delay and 12 ns setup time support >25 MHz pattern rates with margin for trace delays. |
Use Scenario: Adapting modern microcontroller parallel port signals to legacy ISA or VME backplane data buses requiring TTL-level registered handshaking. IC Role / Device Role / Timing Role: Level-translating and edge-aligned register bridging between 3.3 V/5 V MCU and 5 V bus infrastructure. Use Value: Direct LSTTL compatibility eliminates external translators; PDIP package allows through-hole repairability in field-deployed systems. |
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 | Identical logic function, pinout, and DC/AC specs; same PDIP-20 package; TI second-source with identical qualification. | No functional difference; fully interchangeable in existing PCB layouts and firmware. | Select when seeking dual-sourcing assurance or alternate logistics channels without design change. |
| 74HCT377D | SOIC-20 package (3.9 mm width); identical electrical specs but different thermal profile (θJA = 58 °C/W vs. 69 °C/W). | Suitable for space-constrained boards; requires rework of footprint and soldering process (reflow vs. wave). | Choose for new designs prioritizing board density; not recommended for drop-in replacement in PDIP-based systems. |
Compared with CD74HCT377E, SN74HCT377N offers identical performance and form factor for supply resilience, while 74HCT377D trades through-hole serviceability for compactness-making it viable only in green-field SOIC layouts.
Availability
CD74HCT377E is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT377E 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.
CD74HCT377E belongs to TI's High-Speed CMOS Logic (HCT) product line, designed specifically for seamless integration into legacy TTL-based systems while delivering CMOS power efficiency and extended temperature operation.
FAQ
What is the maximum clock frequency supported by CD74HCT377E?
The CD74HCT377E supports a maximum clock frequency of 25 MHz at 25 °C (CL = 15 pF), derating to 20 MHz over -40 °C to +85 °C and 16 MHz across the full -55 °C to +125 °C range. This limit is constrained by propagation delay and setup/hold timing margins, not by internal oscillator or PLL circuits, as the device is purely combinational+sequential logic with no internal clock generation.
Does CD74HCT377E require external pull-up resistors on its inputs?
No, CD74HCT377E does not require external pull-up resistors on its inputs. Its HCT inputs have defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds with input leakage current ≤±1 µA, allowing direct connection to TTL outputs or microcontroller GPIO without biasing. Pull-ups are only needed if driving from open-collector sources or floating nodes outside valid logic levels.
Can CD74HCT377E operate at 3.3 V supply voltage?
No, CD74HCT377E cannot operate reliably at 3.3 V. Its HCT specification mandates 4.5 V to 5.5 V supply range to guarantee TTL-compatible input thresholds and output drive strength. At 3.3 V, VIH would fall below 2.0 V, risking misreads of high logic states; use CD74HC377E (2–6 V) instead for 3.3 V systems.
What is the purpose of the E (Enable) pin on CD74HCT377E?
The E (Enable) pin on CD74HCT377E is an active-low global control that gates the clock's effect on the flip-flops. When E is high, all Q outputs hold their current state regardless of D inputs or CP transitions. Only when E is low does a rising CP edge load D0–D7 into Q0–Q7 simultaneously-enabling synchronized 8-bit data capture or freeze functionality.
Is CD74HCT377E RoHS compliant?
Yes, CD74HCT377E is RoHS compliant, as confirmed by Texas Instruments' packaging documentation. The part uses NiPdAu (NIPDAU) lead finish, meets EU Directive 2011/65/EU requirements, and carries no exemptions. RoHS status is verified per TI's official material declaration and applies to all active orderable variants including CD74HCT377E and CD74HCT377E.A.
CD74HCT377E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74HCT377E FAQ
1.How can I place an order for CD74HCT377E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT377E 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 CD74HCT377E reliable?
The price and inventory of CD74HCT377E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT377E is usually 5 days.
3.What payment methods are accepted for CD74HCT377E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT377E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT377E?
CD74HCT377E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT377E 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 CD74HCT377E?
For technical support, including CD74HCT377E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT377E requirements.
6.How does Aetrix verify that CD74HCT377E is sourced from the original manufacturer or authorized distributors?
All CD74HCT377E 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 CD74HCT377E meets industry standards.
7.What is the process for return or replacement of CD74HCT377E?
All CD74HCT377E units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT377E, 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 CD74HCT377E part is unused and in its original packaging.
Return procedure for CD74HCT377E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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