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Texas Instruments CY74FCT377TQCT
- Part No.:
- CY74FCT377TQCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT377TQCT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,916
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Product details
Overview
CY74FCT377TQCT from Texas Instruments is an 8-bit edge-triggered D-type register with clock enable, designed for address/data synchronization in TTL-compatible digital systems. It features 64-mA sink / 32-mA source drive strength, 13-ns maximum propagation delay (tPLH/tPHL), Ioff partial-power-down support, and operates over –40°C to 85°C. Used in bus interface logic and control-path latching.
For engineers reviewing the CY74FCT377TQCT datasheet, CY74FCT377TQCT pinout, CY74FCT377TQCT application, or CY74FCT377TQCT equivalent, key selection criteria include its 20-pin QSOP package, TTL-level input compatibility, 5-V supply operation, clock-enable–controlled synchronous loading, and industrial temperature range suitability.
Technical Context
The CY74FCT377TQCT implements eight independent D-type flip-flops sharing a common buffered clock (CP) and active-low clock enable (CE). All outputs update synchronously on the low-to-high CP transition when CE is asserted low, with setup/hold times of 2 ns and 1.5 ns respectively.
It uses FCT-family silicon with edge-rate control circuitry to reduce switching noise, matched rise/fall times, and Ioff protection enabling safe back-drive prevention during partial power-down. Input thresholds comply fully with TTL logic levels (VIH = 2 V min, VIL = 0.8 V max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit edge-triggered D-type register with clock enable |
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation within standard 5-V TTL rail tolerances |
| Propagation Delay | 13 ns max (CP to O) - supports ≤77 MHz system clocking with timing margin |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads or multiple TTL inputs directly |
| Input Compatibility | Fully TTL-compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - interoperable with legacy 74LS/74ALS without level shifting |
| Ioff Support | Active at VCC = 0 V - prevents current backflow during hot-insertion or partial power-down |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial handling robustness requirements |
Pinout & Package
CY74FCT377TQCT is housed in a 20-pin QSOP (DBQ) package with 0.65-mm pitch, 7.2-mm body width, and moisture sensitivity level MSL-2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CE | Active-low clock enable - must be stable one setup time before CP↑ for predictable register load |
| 2–9 | D0–D7 | Data inputs - sampled at D inputs one setup time before low-to-high CP edge |
| 10 | GND | Ground reference - decoupling capacitor placement critical for noise suppression |
| 11 | VCC | 5-V power supply - requires local 0.1-µF ceramic bypass near pin |
| 12–19 | O0–O7 | Registered outputs - three-state capable only in variants with output enable; this part has totem-pole outputs |
| 20 | CP | Buffered clock input - low-to-high transition triggers simultaneous parallel load of all eight bits |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting di/dt - improves signal integrity in dense PCB layouts |
| Matched rise/fall times | Minimizes duty cycle distortion in clock distribution paths - preserves timing margins in synchronous systems |
| Ioff partial-power-down | Disables outputs when VCC = 0 V - enables live insertion and mixed-voltage domain isolation |
| TTL-compatible input thresholds | Accepts standard 74LS/74ALS logic levels without external biasing - simplifies legacy system upgrades |
| Industrial temperature range | –40°C to +85°C operation - qualified for use in factory automation, telecom infrastructure, and embedded controllers |
Applications
| Bus Interface Latching | Address Register in Microcontroller Systems |
|---|---|
Use Scenario: Capturing 8-bit data from a shared multiplexed bus during memory or peripheral access cycles. IC Role / Device Role / Timing Role: Synchronous latch holding bus data stable while address decoding completes. Use Value: Eliminates need for external glue logic; 64-mA sink capability drives terminated bus lines directly without buffers. |
Use Scenario: Holding upper/lower byte of program or data address in 8-bit microcontroller expansion interfaces. IC Role / Device Role / Timing Role: Edge-triggered register synchronized to CPU ALE or WR strobe for deterministic address capture. Use Value: CE input allows selective latching under software control; 13-ns tPD enables tight timing budgets in 10-MHz+ systems. |
| Data Acquisition Channel Buffering | Industrial I/O Module Input Capture |
Use Scenario: Isolating and synchronizing analog-to-digital converter (ADC) parallel output data to a controller's sampling clock. IC Role / Device Role / Timing Role: Input register capturing ADC conversion result on rising edge of sample clock. Use Value: TTL-compatible inputs accept direct connection from CMOS or bipolar ADCs; Ioff protects against backfeed during ADC power cycling. |
Use Scenario: Capturing status bits from discrete sensors or field devices in programmable logic controller (PLC) input modules. IC Role / Device Role / Timing Role: Synchronized input latch aligning sensor data to internal scan cycle timing. Use Value: Industrial temp rating and ESD robustness (2000-V HBM) ensure reliability in electrically noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT377ATQCT | 7.2-ns max propagation delay; lower drive (32-mA sink / 15-mA source) | Better suited for high-speed, low-noise applications where reduced edge rate is acceptable | Select when tighter timing margins are required and load drive demands are moderate |
| SN74FCT377TQCT | Same 13-ns speed grade but commercial temp range (0°C to 70°C); no Ioff support | Limited to non-industrial environments; lacks partial-power-down capability | Choose only for cost-sensitive consumer or lab-grade designs without hot-swap or mixed-rail requirements |
Compared with CY74FCT377TQCT, CY74FCT377ATQCT offers faster timing at lower drive strength, while SN74FCT377TQCT sacrifices industrial temperature rating and Ioff for lower cost - making CY74FCT377TQCT the optimal choice for ruggedized, mixed-voltage embedded control.
Availability
CY74FCT377TQCT is available at Aetrix Electronics and suitable for bus interface latching, microcontroller address registration, data acquisition buffering, and industrial I/O module design requiring stable component supply across extended temperature ranges.
Supply support for CY74FCT377TQCT 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 industrial-grade product validation.
CY74FCT377TQCT belongs to TI's FCT logic family, engineered for high-noise-immunity, TTL-compatible interfacing in industrial control, communications infrastructure, and legacy system upgrades.
FAQ
What is the maximum clock frequency supported by CY74FCT377TQCT?
CY74FCT377TQCT supports a maximum clock frequency of approximately 77 MHz, derived from its 13-ns maximum propagation delay (tPLH/tPHL) and 2-ns minimum pulse width requirement. This assumes clean signal integrity, proper decoupling, and worst-case timing conditions across the –40°C to 85°C operating range. System-level timing must also account for setup/hold margins of 2 ns and 1.5 ns respectively.
Does CY74FCT377TQCT have three-state outputs?
No, CY74FCT377TQCT does not feature three-state outputs. It uses totem-pole (push-pull) output drivers with fixed high/low states. Unlike variants such as CY74FCT377CTQCT which include output enable (OE), CY74FCT377TQCT relies solely on clock enable (CE) for functional gating - outputs remain actively driven at all times when powered.
Can CY74FCT377TQCT operate with a 3.3-V supply?
No, CY74FCT377TQCT is specified only for 4.75 V to 5.25 V operation. Its TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and output voltage levels (VOH ≈ 3.3 V typical at 5 V) are optimized for 5-V systems. Using 3.3 V violates recommended operating conditions and risks unreliable logic transitions, especially at temperature extremes.
What is the purpose of the Ioff specification in CY74FCT377TQCT?
The Ioff specification in CY74FCT377TQCT ensures that when VCC = 0 V, the device's outputs enter a high-impedance state with leakage current limited to ±1 µA. This prevents damaging current backflow from live buses into a powered-down section of the system - a critical requirement for hot-swap capability, partial power-down architectures, and mixed-supply domain isolation.
How does CY74FCT377TQCT differ from CY74FCT377CTQCT?
CY74FCT377TQCT is the standard-speed variant (13-ns max tPD, 64-mA sink), while CY74FCT377CTQCT is the faster "C" grade (5.2-ns max tPD, 32-mA sink). The "T" version prioritizes drive strength and noise immunity via edge-rate control; the "C" version optimizes for minimal propagation delay in high-speed timing-critical paths - both share identical pinout, package, and functional behavior.
CY74FCT377TQCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- 13ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Iq):
- 200 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
CY74FCT377TQCT FAQ
1.How can I place an order for CY74FCT377TQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT377TQCT 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 CY74FCT377TQCT reliable?
The price and inventory of CY74FCT377TQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT377TQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT377TQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT377TQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT377TQCT?
CY74FCT377TQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT377TQCT 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 CY74FCT377TQCT?
For technical support, including CY74FCT377TQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT377TQCT requirements.
6.How does Aetrix verify that CY74FCT377TQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT377TQCT 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 CY74FCT377TQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT377TQCT?
All CY74FCT377TQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT377TQCT, 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 CY74FCT377TQCT part is unused and in its original packaging.
Return procedure for CY74FCT377TQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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