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Texas Instruments CY74FCT377ATSOCT
- Part No.:
- CY74FCT377ATSOCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT377ATSOCT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,353
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Product details
Overview
CY74FCT377ATSOCT 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), ±32 mA output drive capability, Ioff partial-power-down support, and TTL-compatible input/output logic levels. It operates across –40°C to +85°C and is used in industrial control backplanes and memory interface synchronization.
For engineers reviewing the CY74FCT377ATSOCT datasheet, CY74FCT377ATSOCT pinout, CY74FCT377ATSOCT application, or CY74FCT377ATSOCT equivalent, key selection criteria include clock-enable timing (tsu = 3.5 ns, th = 1.5 ns), output drive strength (64 mA sink / 32 mA source), Ioff-enabled system power sequencing, and SOIC-20 package compatibility with legacy FCT logic families.
Technical Context
The CY74FCT377ATSOCT implements eight independent D-type flip-flops sharing a common buffered clock (CP) and clock-enable (CE) input. All outputs update synchronously on the low-to-high CP transition when CE is low, with setup/hold timing referenced strictly to that edge.
Its Ioff circuitry actively disables outputs during VCC = 0 V operation, preventing back-drive current into powered-down subsystems. Edge-rate control circuitry ensures matched rise/fall times and reduced switching noise-critical for stable operation in mixed-signal PCB environments with shared ground planes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 7.2 ns max - ensures tight timing margin in 10–15 MHz synchronous bus applications |
| Output Drive Strength | 64 mA sink / 32 mA source - directly drives multiple TTL loads without external buffers |
| Supply Voltage Range | 4.75 V to 5.25 V - compatible with regulated 5-V systems; rejects supply ripple up to ±250 mV |
| Ioff Leakage Current | ±1 µA at VCC = 0 V - enables safe hot-insertion and partial-power-down in modular chassis designs |
| Input Thresholds (VIH/VIL) | 2.0 V / 0.8 V - fully interoperable with standard TTL logic without level-shifting |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient environments including factory automation controllers |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 requirements for board-level handling robustness |
Pinout & Package
CY74FCT377ATSOCT is housed in a 20-pin SOIC (DW) package with 0.300-inch body width and standard JEDEC MO-001AC footprint. Pin spacing is 0.050 inch (1.27 mm), compatible with automated SMT placement and reflow profiles per IPC-J-STD-020 Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CE | Clock Enable - active-low control enabling synchronous load of all 8 bits on next CP↑ |
| 2–9 | D0–D7 | Data Inputs - asynchronous inputs sampled one setup time before CP↑ edge |
| 10 | GND | Ground Reference - primary return path for all I/O and internal logic currents |
| 11 | VCC | Power Supply - 4.75–5.25 V nominal; decoupling required within 10 mm of pin |
| 12–19 | O0–O7 | Registered Outputs - true (non-inverted) outputs updated only on enabled CP↑ transitions |
| 20 | CP | Clock Input - low-to-high edge triggers simultaneous latch action across all flip-flops |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Controlled Outputs | Matched rise/fall times reduce EMI and crosstalk in dense routing, especially on shared data buses |
| Ioff Partial-Power-Down Support | Enables safe isolation of unpowered sections in multi-rail systems without signal contention or latch-up risk |
| TTL-Compatible I/O Levels | Eliminates need for level translators when interfacing with legacy 74LS/74ALS peripherals or microcontrollers |
| Low Propagation Skew | ≤0.5 ns between any two O0–O7 outputs ensures deterministic parallel data capture in timing-critical paths |
| High Noise Immunity | 0.2 V input hysteresis (Vhys) suppresses false triggering from ground bounce or coupled transients |
Applications
| Industrial PLC Backplane Interface | Memory Address Latching |
|---|---|
Use Scenario: Synchronizing address bus signals between a microcontroller and dual-port SRAM in a programmable logic controller. IC Role / Device Role / Timing Role: CY74FCT377ATSOCT acts as a clock-enabled 8-bit address latch, capturing stable address bits on CP↑ while CE gates invalid cycles during bus arbitration. Use Value: Enables deterministic 7.2 ns address setup to SRAM, supporting 10 MHz burst reads without wait states or metastability. |
Use Scenario: Capturing and holding 8-bit I/O port data from a microcontroller before transferring to a peripheral via parallel bus. IC Role / Device Role / Timing Role: CY74FCT377ATSOCT serves as a data staging register, isolating CPU write cycles from slower peripheral handshake timing. Use Value: Provides 64 mA sink drive to directly control LED arrays or opto-isolator inputs without external drivers. |
| Automated Test Equipment (ATE) Pattern Generator | Legacy Bus Signal Conditioning |
Use Scenario: Generating precise, glitch-free stimulus patterns for digital IC functional testing using a pattern memory and sequencer. IC Role / Device Role / Timing Role: CY74FCT377ATSOCT buffers and retimes pattern data from high-speed FIFOs to match tester channel timing windows. Use Value: Delivers sub-nanosecond output skew and 0.55 V VOL at 64 mA load-ensuring clean logic thresholds under heavy capacitive loading. |
Use Scenario: Interfacing modern FPGA I/O banks to legacy 5-V TTL peripherals in avionics maintenance test sets. IC Role / Device Role / Timing Role: CY74FCT377ATSOCT functions as a bidirectional voltage-tolerant buffer, leveraging Ioff to isolate FPGA during power-down sequences. Use Value: Eliminates external power sequencing logic by allowing FPGA VCC to drop while CY74FCT377ATSOCT remains powered and isolated. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit registered latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT377ATSOCT | Same pinout, identical timing (7.2 ns), but rated for 0°C to +70°C commercial temp range | Lacks extended industrial temperature qualification; unsuitable for field-deployed equipment | Select only for cost-sensitive lab or benchtop prototypes where ambient stays <60°C |
| 74ACT377SCX | Higher VOH (≥4.4 V), lower IOL (24 mA), no Ioff support; 5.5 V absolute max rating | Cannot safely interface with partially powered systems; requires strict power-rail sequencing | Prefer only when driving high-threshold CMOS loads and full-system power cycling is guaranteed |
Compared with SN74FCT377ATSOCT, CY74FCT377ATSOCT adds industrial temperature support and tighter VOL spec; compared with 74ACT377SCX, it provides Ioff protection and higher sink drive-making it the sole choice for robust, hot-swappable industrial backplanes.
Availability
CY74FCT377ATSOCT is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory address latching, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT377ATSOCT 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 component development.
The CY74FCT377ATSOCT belongs to TI's FCT logic family-designed specifically for high-noise immunity, TTL compatibility, and partial-power-down resilience in factory automation and telecom infrastructure.
FAQ
What is the maximum clock frequency supported by CY74FCT377ATSOCT?
CY74FCT377ATSOCT does not specify a maximum clock frequency in its datasheet; instead, it guarantees timing margins based on propagation delay (7.2 ns max) and setup/hold requirements (tsu = 3.5 ns, th = 1.5 ns). For reliable operation, the minimum clock period must exceed tPLH + tsu + th = 12.2 ns, supporting up to ~82 MHz in ideal conditions-but practical use in industrial systems typically targets ≤15 MHz to accommodate trace delays and noise margins. The CY74FCT377ATSOCT is optimized for synchronous bus interfacing, not high-speed clock distribution.
Does CY74FCT377ATSOCT support hot-swap or live-insertion?
Yes, CY74FCT377ATSOCT supports controlled hot-swap operation via its Ioff feature: when VCC = 0 V, output leakage is limited to ±1 µA, preventing damaging back-current flow into powered-down subsystems. This allows safe insertion/removal in modular chassis where backplane rails remain active. However, CY74FCT377ATSOCT itself must be powered before asserting CE or CP-so full system-level hot-swap requires coordinated rail sequencing. The CY74FCT377ATSOCT datasheet explicitly validates this behavior under partial-power-down test conditions.
Can CY74FCT377ATSOCT drive multiple 74LS inputs directly?
Yes, CY74FCT377ATSOCT can drive up to four standard 74LS inputs per output: each 74LS gate draws 0.4 mA high-level input current (IIH), and CY74FCT377ATSOCT provides –32 mA IOH with VOH ≥ 2.4 V at VCC = 4.75 V-well above the 74LS VIH minimum of 2.0 V. Its 64 mA IOL also exceeds the 74LS IIL requirement (–0.4 mA per input), enabling direct fanout without buffers. This interoperability is confirmed in the "Fully Compatible With TTL Input and Output Logic Levels" feature statement for CY74FCT377ATSOCT.
What is the purpose of the CE (Clock Enable) pin on CY74FCT377ATSOCT?
The CE pin on CY74FCT377ATSOCT is an active-low enable that gates the clock input: only when CE is low will the rising edge of CP transfer D0–D7 to O0–O7. When CE is high, outputs retain their last latched state regardless of CP activity-enabling precise data hold during bus arbitration or interrupt servicing. The CY74FCT377ATSOCT datasheet specifies CE setup/hold timing (3.5 ns / 1.5 ns) relative to CP↑, confirming its role in deterministic synchronization rather than simple gating. This makes CY74FCT377ATSOCT ideal for address/data strobing in microprocessor co-processor interfaces.
Is CY74FCT377ATSOCT RoHS compliant and lead-free?
Yes, CY74FCT377ATSOCT is RoHS compliant and lead-free. Per TI's Packaging Information Addendum, the orderable part number CY74FCT377ATSOC (tube) and CY74FCT377ATSOCT (tape-and-reel) both carry "Yes" in the RoHS column and "NIPDAU" (nickel-palladium-gold) lead finish. The MSL rating is Level-1 (unlimited floor life), and peak reflow temperature is 260°C-fully aligned with J-STD-020. This compliance applies to all currently shipped CY74FCT377ATSOCT units sourced through authorized TI channels and verified by Aetrix Electronics' traceable supply chain.
CY74FCT377ATSOCT 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
CY74FCT377ATSOCT FAQ
1.How can I place an order for CY74FCT377ATSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT377ATSOCT 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 CY74FCT377ATSOCT reliable?
The price and inventory of CY74FCT377ATSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT377ATSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT377ATSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT377ATSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT377ATSOCT?
CY74FCT377ATSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT377ATSOCT 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 CY74FCT377ATSOCT?
For technical support, including CY74FCT377ATSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT377ATSOCT requirements.
6.How does Aetrix verify that CY74FCT377ATSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT377ATSOCT 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 CY74FCT377ATSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT377ATSOCT?
All CY74FCT377ATSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT377ATSOCT, 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 CY74FCT377ATSOCT part is unused and in its original packaging.
Return procedure for CY74FCT377ATSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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