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Texas Instruments CY74FCT377ATSOCTE4
- Part No.:
- CY74FCT377ATSOCTE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT377ATSOCTE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,755
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Product details
Overview
CY74FCT377ATSOCTE4 from Texas Instruments is an 8-bit edge-triggered D-type register with clock enable, designed for synchronous data latching in address/data bus interfaces. It features 7.2 ns propagation delay (tPLH/tPHL), 64 mA sink / 32 mA source output drive, and Ioff partial-power-down support. Used in industrial control backplanes and legacy TTL-compatible memory interface circuits.
For engineers reviewing the CY74FCT377ATSOCTE4 datasheet, CY74FCT377ATSOCTE4 pinout, CY74FCT377ATSOCTE4 application, or CY74FCT377ATSOCTE4 equivalent, key selection criteria include clock-enable timing (tsu = 3.5 ns, th = 1.5 ns), SOIC-20 package compatibility, −40°C to 85°C operating range, and FCT-family TTL-level interoperability.
Technical Context
This device 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 timing referenced to that edge.
It integrates edge-rate control circuitry to reduce switching noise, supports Ioff for live-insertion and partial-power-down operation, and maintains matched rise/fall times. Input thresholds comply fully with TTL logic levels (VIH = 2 V min, VIL = 0.8 V max), ensuring seamless interfacing with legacy 5-V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 7.2 ns max (tPLH/tPHL); ensures tight timing margin in 10–15 MHz synchronous bus applications. |
| Output Drive | 64 mA sink / 32 mA source; drives heavy capacitive loads or multiple TTL inputs without external buffers. |
| Supply Voltage | 4.75 V to 5.25 V; operates reliably across standard 5-V ±5% rail tolerances. |
| Input Thresholds | VIH ≥ 2 V, VIL ≤ 0.8 V; fully compatible with TTL input logic levels, eliminating level-shifting needs. |
| Ioff Current | ±1 µA at VCC = 0 V; prevents backflow current during partial power-down, protecting powered subsystems. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM; meets industrial-grade robustness requirements for board-level handling. |
| Operating Temperature | −40°C to +85°C; qualified for extended-temperature industrial environments. |
Pinout & Package
Package: SOIC-20 (DW), body size 12.83 mm × 5.3 mm, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CE | Active-low clock enable; must be stable 3.5 ns before CP↑ for predictable register load behavior. |
| 2–9 | D0–D7 | Asynchronous data inputs; sampled one setup time (2 ns) before CP↑ edge. |
| 10 | GND | Ground reference for all internal logic and output drivers. |
| 11 | VCC | 5-V supply input; decoupling capacitor required within 1 cm of this pin. |
| 12–19 | O0–O7 | Registered outputs; high-impedance state not supported-outputs are always driven (non-3-state). |
| 20 | CP | Buffered clock input; low-to-high transition triggers simultaneous latch of all D inputs to O outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Controlled Outputs | Reduced di/dt minimizes simultaneous switching noise (SSN) in dense PCB layouts. |
| Ioff Partial-Power-Down Support | Enables safe insertion/removal in hot-swap backplane systems without damaging adjacent powered ICs. |
| TTL-Compatible Input/Output Levels | Eliminates need for level translators when interfacing with legacy 74LS/74ALS logic families. |
| Matched Rise/Fall Times | Ensures symmetrical signal edges, reducing jitter accumulation in cascaded register chains. |
| Full Edge-Triggered Architecture | Guarantees deterministic sampling-no metastability risk from asynchronous CE assertion relative to CP. |
Applications
| Industrial Backplane Data Latching | Legacy Memory Address Buffering |
|---|---|
|
Use Scenario: Synchronizing parallel address/data transfers between microcontroller and ISA-style peripheral cards in programmable logic controllers. IC Role / Device Role / Timing Role: 8-bit registered latch providing setup/hold-compliant address hold during bus arbitration cycles. Use Value: 7.2 ns tPLH enables reliable operation at 10 MHz bus clocks with 5 ns margin for trace skew and driver delays. |
Use Scenario: Holding 8-bit segment addresses in retro-computing expansion modules where CPU and memory operate on separate timing domains. IC Role / Device Role / Timing Role: Clock-enabled D-register capturing address bits on rising edge of memory controller strobe. Use Value: TTL-compatible VIH/VIL allows direct connection to Z80/6502 address lines without pull-ups or level shifters. |
| Test Equipment Pattern Generation | Automated Test Fixture Control |
|
Use Scenario: Generating repeatable digital stimulus patterns for functional testing of 8-bit microprocessor peripherals. IC Role / Device Role / Timing Role: Synchronized output register feeding pattern data to DUT under test via parallel bus. Use Value: 64 mA sink capability drives 10+ TTL loads per output, supporting multi-pin fanout without buffering. |
Use Scenario: Controlling relay banks and LED status indicators in automated manufacturing test fixtures with mixed-voltage subsystems. IC Role / Device Role / Timing Role: Isolated register stage enabling precise timing alignment of control signals with system clock domain. Use Value: Ioff protection prevents backfeed into unpowered relay driver stages during fixture power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit synchronous register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT377TQCT | 7.2 ns speed grade in QSOP-20; same electrical specs but 4.4 mm × 6.5 mm footprint vs SOIC's 12.8 mm × 7.5 mm. | Preferred for space-constrained PCBs; thermal resistance higher (68°C/W vs 58°C/W), limiting high-duty-cycle use. | Select when board area is critical and thermal derating is acceptable. |
| SN74FCT377NSR | Same function and timing, but TI-branded; identical SOIC-20 package, 7.2 ns, 64/32 mA drive, −40°C to 85°C. | No functional difference; differs only in part marking, packaging (tape-and-reel vs tube), and manufacturer branding. | Drop-in replacement with identical layout and performance-verify reel quantity and MSL rating match program needs. |
Compared with CY74FCT377ATSOCTE4, CY74FCT377TQCT offers smaller footprint at the cost of thermal performance, while SN74FCT377NSR provides identical functionality with TI's standard branding and logistics-both require no PCB changes but differ in sourcing channel and packaging format.
Availability
CY74FCT377ATSOCTE4 is available at Aetrix Electronics and suitable for industrial backplane latching, legacy memory buffering, and automated test fixture control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT377ATSOCTE4 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 over 50 years of industrial-grade product development.
CY74FCT377ATSOCTE4 belongs to the FCT logic family-designed specifically for high-noise-immunity, TTL-compatible 5-V systems requiring precise edge-triggered synchronization in industrial and instrumentation applications.
FAQ
What is the maximum clock frequency supported by CY74FCT377ATSOCTE4?
CY74FCT377ATSOCTE4 supports reliable operation up to 10 MHz under typical conditions. Its 7.2 ns propagation delay (tPLH/tPHL) and 3.5 ns setup time (tsu) allow it to meet timing closure in synchronous bus designs with ≥5 ns margin at 10 MHz, assuming proper PCB layout and load capacitance ≤50 pF per output.
Does CY74FCT377ATSOCTE4 support 3-state outputs?
No, CY74FCT377ATSOCTE4 does not provide 3-state outputs. It is a true registered latch with actively driven outputs (O0–O7) at all times-there is no output enable (OE) pin or high-impedance mode. For bus-sharing applications requiring tri-state capability, consider CY74FCT244T or similar octal buffers instead.
Can CY74FCT377ATSOCTE4 be used in partial-power-down systems?
Yes, CY74FCT377ATSOCTE4 supports partial-power-down via its Ioff feature. When VCC = 0 V, Ioff limits leakage to ±1 µA per I/O terminal, preventing damaging back-current flow into powered sections of the system-making it suitable for hot-swap and modular backplane architectures.
What is the recommended decoupling for CY74FCT377ATSOCTE4?
Place a 0.1 µF ceramic capacitor between VCC (pin 11) and GND (pin 10), located within 1 cm of the SOIC-20 package. For systems with high switching activity, add a bulk 4.7 µF tantalum or aluminum electrolytic capacitor near the power entry point to suppress low-frequency rail droop.
Is CY74FCT377ATSOCTE4 pin-compatible with older 74LS377 devices?
CY74FCT377ATSOCTE4 is functionally and pinout-compatible with 74LS377 in SOIC-20 (DW) package, sharing identical pin assignments (CE, D0–D7, GND, VCC, O0–O7, CP). However, it delivers significantly higher drive strength (64/32 mA vs 8/0.4 mA) and faster timing (7.2 ns vs 25 ns), requiring verification of load capacitance and termination in legacy designs.
CY74FCT377ATSOCTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 7.2ns @ 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-SOIC
CY74FCT377ATSOCTE4 FAQ
1.How can I place an order for CY74FCT377ATSOCTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT377ATSOCTE4 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 CY74FCT377ATSOCTE4 reliable?
The price and inventory of CY74FCT377ATSOCTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT377ATSOCTE4 is usually 5 days.
3.What payment methods are accepted for CY74FCT377ATSOCTE4?
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4.How is shipping managed for CY74FCT377ATSOCTE4?
CY74FCT377ATSOCTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT377ATSOCTE4 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 CY74FCT377ATSOCTE4?
For technical support, including CY74FCT377ATSOCTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT377ATSOCTE4 requirements.
6.How does Aetrix verify that CY74FCT377ATSOCTE4 is sourced from the original manufacturer or authorized distributors?
All CY74FCT377ATSOCTE4 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 CY74FCT377ATSOCTE4 meets industry standards.
7.What is the process for return or replacement of CY74FCT377ATSOCTE4?
All CY74FCT377ATSOCTE4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT377ATSOCTE4, 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 CY74FCT377ATSOCTE4 part is unused and in its original packaging.
Return procedure for CY74FCT377ATSOCTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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