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Texas Instruments CY74FCT377ATSOCTG4
- Part No.:
- CY74FCT377ATSOCTG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT377ATSOCTG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
CY74FCT377ATSOCTG4 from Texas Instruments is an 8-bit edge-triggered D-type register IC 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 operates at 4.75–5.25 V over –40°C to +85°C. Used in industrial control backplanes and legacy TTL-compatible memory subsystems.
For engineers reviewing the CY74FCT377ATSOCTG4 datasheet, CY74FCT377ATSOCTG4 pinout, CY74FCT377ATSOCTG4 application, or CY74FCT377ATSOCTG4 equivalent, key selection criteria include its 20-pin SOIC package, Ioff partial-power-down support, matched rise/fall times, and compatibility with FCT/F logic families.
Technical Context
This device 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 times of 2 ns (tsu) and 1.5 ns (th) respectively.
It integrates edge-rate control circuitry to reduce switching noise, supports Ioff for partial-power-down protection, and maintains full TTL-level compatibility-accepting 0.8 V/2.0 V VIH/VIL thresholds and delivering VOH ≥ 2.4 V (at IOH = –32 mA) and VOL ≤ 0.55 V (at IOL = 64 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 7.2 ns max (tPLH/tPHL); ensures timing compliance in 100 MHz–138 MHz synchronous bus systems. |
| Output Drive | 64 mA sink / 32 mA source; drives heavy capacitive loads and multiple TTL inputs without external buffers. |
| Supply Voltage | 4.75–5.25 V; tightly regulated range minimizes supply-induced jitter in clocked register operation. |
| Ioff Current | ±1 µA at VCC = 0 V; prevents backflow current during hot-swap or partial power-down sequences. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V; guarantees robust noise margin against TTL-level signal degradation. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM; meets industrial-grade reliability requirements for board-level handling. |
| Operating Temperature | –40°C to +85°C; validated for use in extended-temperature industrial automation and telecom infrastructure. |
Pinout & Package
Package: 20-pin SOIC (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CE (Clock Enable) | Active-low control enabling simultaneous register load; must be stable 3.5 ns before CP↑ for predictable operation. |
| 2–9, 11–18 | D0–D7 / O0–O7 | Eight bidirectional data I/O pairs; D inputs sampled at CP↑, O outputs reflect registered state with 7.2 ns delay. |
| 10 | GND | Power ground reference; decoupling capacitor placement critical for noise suppression in high-speed register banks. |
| 20 | VCC | 5 V supply rail; requires local 0.1 µF ceramic bypass adjacent to pin to maintain stable switching margins. |
| 19 | CP | Buffered clock input; low-to-high transition triggers all eight flip-flops simultaneously; edge-rate controlled for EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Controlled Outputs | Slower edge transitions reduce radiated emissions by >6 dB compared to standard FCT devices-critical for EMC-constrained PCB layouts. |
| Ioff Partial-Power-Down Support | Enables safe insertion/removal in live backplanes; disables outputs when VCC = 0 V, preventing bus contention or latch-up. |
| Matched Rise/Fall Times | Ensures symmetrical signal integrity across all eight channels-eliminates duty-cycle distortion in clock distribution paths. |
| TTL-Compatible Logic Levels | Accepts standard TTL VIH/VIL and drives TTL loads directly-no level-shifting required in mixed-logic legacy systems. |
| Low Propagation Skew | ≤0.5 ns inter-output skew enables precise multi-bit alignment in time-critical address latching applications. |
Applications
| Industrial Backplane Interface | Legacy Memory Subsystem |
|---|---|
|
Use Scenario: Synchronizing address/data transfers between microcontroller and parallel flash memory in programmable logic controllers. IC Role / Device Role / Timing Role: Acts as a clock-enabled 8-bit latch, capturing address bits on rising CP edge while CE gates valid access windows. Use Value: Eliminates metastability risk in asynchronous bus handshaking and reduces external glue logic count by 30% versus discrete flip-flop solutions. |
Use Scenario: Buffering and registering control signals (e.g., chip select, write enable) in ISA-bus-based embedded instrumentation. IC Role / Device Role / Timing Role: Provides deterministic timing alignment for multi-cycle memory access protocols using shared CP and CE lines. Use Value: Enables reliable 100 ns cycle-time operation under worst-case temperature/voltage conditions without timing closure rework. |
| Telecom Line Card Control | Automated Test Equipment (ATE) |
|
Use Scenario: Latching configuration registers for FPGA-based framer modules in T1/E1 line interface cards. IC Role / Device Role / Timing Role: Registers control words from serial-to-parallel shifters into parallel format synchronized to system clock domain. Use Value: Supports hot-swap capability via Ioff, allowing field-replaceable line cards to be inserted without powering down the entire shelf. |
Use Scenario: Capturing digital stimulus patterns from pattern generators before applying them to DUT pins in boundary-scan test systems. IC Role / Device Role / Timing Role: Functions as a precision-aligned sample-and-hold stage, freezing pattern data at exact clock edges for sub-nanosecond timing accuracy. Use Value: Achieves <1.5 ns setup/hold margin across all 8 bits-meeting JEDEC JTAG TCK timing compliance for Class B ATE platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT377CTSOCT | 5.2 ns propagation delay (vs. 7.2 ns); higher speed grade with identical pinout and voltage specs. | Suitable for faster bus cycles (e.g., 138 MHz CPU buses) where timing margin is constrained. | Select when tPLH/tPHL < 6 ns is required; otherwise CY74FCT377ATSOCTG4 offers better noise immunity at lower speed. |
| SN74FCT377NSR | Same 7.2 ns speed but in 20-pin SO (NS) package; lacks Ioff support and has reduced ESD ratings (1500-V HBM). | Limited to non-hot-swap, fixed-power applications with less stringent reliability requirements. | Choose only if cost sensitivity outweighs partial-power-down need and industrial ESD robustness is not mandated. |
Compared with CY74FCT377CTSOCT and SN74FCT377NSR, CY74FCT377ATSOCTG4 uniquely balances moderate speed (7.2 ns), full Ioff protection, and MIL-grade ESD-making it optimal for ruggedized, field-deployable systems requiring both timing predictability and fault resilience.
Availability
CY74FCT377ATSOCTG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory subsystems, telecom line card control, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT377ATSOCTG4 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 innovation in high-reliability interface and timing products.
CY74FCT377ATSOCTG4 belongs to TI's FCT logic family-engineered for seamless interoperability with TTL systems while delivering enhanced noise immunity, power-down safety, and industrial temperature resilience.
FAQ
What is the maximum clock frequency supported by CY74FCT377ATSOCTG4?
CY74FCT377ATSOCTG4 supports a minimum clock pulse width of 6 ns (tw), enabling reliable operation up to 83 MHz in worst-case conditions. Its 7.2 ns propagation delay and 2 ns setup time allow stable use in 100 MHz synchronous bus designs when combined with appropriate board layout and termination practices. The device does not specify a maximum fCP limit but is characterized for timing compliance at frequencies consistent with its published delay and setup/hold parameters.
Does CY74FCT377ATSOCTG4 support hot-swap or partial-power-down operation?
Yes, CY74FCT377ATSOCTG4 includes Ioff circuitry that disables outputs when VCC = 0 V, limiting Ioff current to ±1 µA. This feature allows safe insertion or removal in live backplane environments without damaging current backflow. The device remains electrically isolated during power-down, making CY74FCT377ATSOCTG4 suitable for modular systems requiring field-upgradeable components without full system shutdown.
What are the key differences between CY74FCT377ATSOCTG4 and CY74FCT377T variants?
CY74FCT377ATSOCTG4 is the "A" speed grade (7.2 ns max tPLH/tPHL) in tape-and-reel SOIC packaging, whereas CY74FCT377T denotes the base-speed variant (13 ns). The "A" suffix also indicates tighter timing tolerances, improved noise characteristics via edge-rate control, and guaranteed operation over –40°C to +85°C. Both share identical pinout, logic function, and Ioff support-but only the "A" grade meets timing requirements for modern industrial bus interfaces.
Can CY74FCT377ATSOCTG4 drive standard TTL loads directly?
Yes, CY74FCT377ATSOCTG4 is fully compatible with TTL input and output logic levels. It delivers VOH ≥ 2.4 V (at –32 mA) and VOL ≤ 0.55 V (at 64 mA), meeting TTL VOHmin (2.4 V) and VOLmax (0.4 V) specifications under load. Its 64 mA sink capability exceeds standard TTL fan-out requirements, allowing direct connection to up to 16 LS-TTL inputs without buffering-verified across the full operating temperature range.
Is CY74FCT377ATSOCTG4 RoHS compliant and what is its moisture sensitivity level?
Yes, CY74FCT377ATSOCTG4 is RoHS compliant with NiPdAu lead finish and carries MSL Level-1 (unlimited floor life at ≤30°C/60% RH). Its SOIC (DW) package is rated for peak reflow temperatures up to 260°C per JEDEC J-STD-020, supporting standard lead-free assembly processes without baking preconditioning. Full compliance documentation-including material declarations and test reports-is available through TI's official product page and Aetrix Electronics' quality portal.
CY74FCT377ATSOCTG4 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
CY74FCT377ATSOCTG4 FAQ
1.How can I place an order for CY74FCT377ATSOCTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT377ATSOCTG4 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 CY74FCT377ATSOCTG4 reliable?
The price and inventory of CY74FCT377ATSOCTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT377ATSOCTG4 is usually 5 days.
3.What payment methods are accepted for CY74FCT377ATSOCTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT377ATSOCTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT377ATSOCTG4?
CY74FCT377ATSOCTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT377ATSOCTG4 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 CY74FCT377ATSOCTG4?
For technical support, including CY74FCT377ATSOCTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT377ATSOCTG4 requirements.
6.How does Aetrix verify that CY74FCT377ATSOCTG4 is sourced from the original manufacturer or authorized distributors?
All CY74FCT377ATSOCTG4 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 CY74FCT377ATSOCTG4 meets industry standards.
7.What is the process for return or replacement of CY74FCT377ATSOCTG4?
All CY74FCT377ATSOCTG4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT377ATSOCTG4, 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 CY74FCT377ATSOCTG4 part is unused and in its original packaging.
Return procedure for CY74FCT377ATSOCTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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