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Texas Instruments CY74FCT377CTSOCTE4
- Part No.:
- CY74FCT377CTSOCTE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT377CTSOCTE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,988
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Product details
Overview
CY74FCT377CTSOCTE4 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 64-mA sink / 32-mA source drive strength, 5.2-ns propagation delay (tPLH/tPHL), and Ioff partial-power-down support. Used in industrial control backplanes and legacy TTL-compatible memory interface circuits.
For engineers reviewing the CY74FCT377CTSOCTE4 datasheet, CY74FCT377CTSOCTE4 pinout, CY74FCT377CTSOCTE4 application, or CY74FCT377CTSOCTE4 equivalent, key selection criteria include TTL-level compatibility, 20-pin SOIC package footprint, clock-enable–controlled edge-triggered operation, and guaranteed Ioff behavior at VCC = 0 V.
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 uses FCT-family silicon with edge-rate control circuitry to reduce switching noise, matched rise/fall times, and full TTL input/output voltage compatibility (VIH = 2 V min, VOL = 0.55 V max at IOL = 64 mA). The Ioff feature disables outputs during power-down to prevent backflow current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit edge-triggered D-type register with clock enable |
| Propagation Delay | 5.2 ns max (tPLH/tPHL at VCC = 5 V, TA = 25°C) |
| Drive Strength | 64 mA sink / 32 mA source (ensures robust TTL bus driving) |
| Supply Voltage | 4.75 V to 5.25 V (tight regulation required for stable timing) |
| Ioff Support | Active at VCC = 0 V (enables safe partial-power-down in mixed-supply systems) |
| Input Compatibility | Fully TTL-compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM (meets industrial handling requirements) |
Pinout & Package
Package: 20-pin SOIC (DW), body size 7.5 mm × 12.8 mm, standard JEDEC MS-013AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CE | Clock enable input - must be low to load data on CP↑ |
| 2–9 | D0–D7 | Independent data inputs for each flip-flop |
| 10 | GND | Ground reference for logic and power |
| 11 | VCC | Positive supply (4.75–5.25 V) |
| 12–19 | O0–O7 | Registered output terminals (non-inverting, totem-pole) |
| 20 | CP | Buffered clock input - low-to-high edge triggers register load |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) in dense PCB layouts |
| Matched rise/fall times | Minimizes duty-cycle distortion in clock distribution paths |
| Ioff partial-power-down | Prevents damaging back-current when VCC = 0 V and bus remains active |
| TTL-compatible thresholds | Direct drop-in replacement for 74LS/74ALS without level-shifting |
| 2000-V HBM ESD protection | Supports handling in non-EPA environments without additional guarding |
Applications
| Industrial PLC Backplane Interface | Legacy Memory Address Latching |
|---|---|
Use Scenario: Synchronizing parallel address/data signals between microcontroller and discrete SRAM or EPROM in programmable logic controllers. IC Role / Device Role / Timing Role: Edge-triggered register capturing address bus state on rising clock edge under CE control. Use Value: Ensures deterministic setup/hold timing (tsu = 2 ns, th = 1.5 ns) across temperature range –40°C to 85°C. |
Use Scenario: Holding 8-bit I/O port data or status flags in retro-computing hardware emulators. IC Role / Device Role / Timing Role: D-type latch providing glitch-free storage of control signals synchronized to system clock. Use Value: 64-mA sink capability drives LED indicators or TTL bus loads directly without external buffers. |
| Automated Test Equipment (ATE) Signal Conditioning | Avionics Data Acquisition Buffering |
Use Scenario: Capturing sensor readouts from parallel ADCs before serial conversion in modular ATE racks. IC Role / Device Role / Timing Role: Clock-enabled register isolating high-speed acquisition path from slower control logic. Use Value: Ioff support allows hot-swap module insertion while main backplane remains powered. |
Use Scenario: Interfacing MIL-STD-1553B remote terminal data lines to legacy 8-bit microcontrollers in flight control subsystems. IC Role / Device Role / Timing Role: Level-translating and timing-aligning parallel status words prior to CRC generation. Use Value: Full TTL compatibility ensures interoperability with aging avionics bus transceivers without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT377TNSR | Same logic function, 5.2-ns delay, but rated for 0°C to 70°C only; no Ioff support | Lacks partial-power-down capability - unsuitable for hot-swap or mixed-voltage systems | Select only if operating temperature is strictly commercial grade and Ioff is not required |
| 74ACT377SCX | Higher VCC range (4.5–5.5 V), 8.5-ns delay, CMOS input; no Ioff or edge-rate control | CMOS inputs require pull-ups for open-wire reliability; higher propagation delay affects timing-critical paths | Choose when lower ICC (0.1 mA typical) outweighs need for noise immunity and Ioff |
Compared with CY74FCT377CTSOCTE4, SN74FCT377TNSR omits Ioff and industrial temperature rating, while 74ACT377SCX trades noise control and power-down safety for wider supply tolerance and lower static current - neither offers pin-to-pin or functional equivalence without layout or firmware revision.
Availability
CY74FCT377CTSOCTE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy memory interface designs, and avionics data buffering requiring stable component supply over extended lifecycle.
Supply support for CY74FCT377CTSOCTE4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and aerospace markets.
CY74FCT377CTSOCTE4 belongs to TI's FCT logic family, engineered for TTL-compatible, noise-immune, industrial-grade register functions in legacy and upgrade systems where reliability and backward compatibility are critical.
FAQ
What is the maximum clock frequency supported by CY74FCT377CTSOCTE4?
CY74FCT377CTSOCTE4 supports a minimum clock pulse width of 7 ns (tw), enabling reliable operation up to approximately 70 MHz in ideal conditions. However, real-world timing margins - including setup/hold (tsu = 2 ns, th = 1.5 ns) and propagation delay (5.2 ns) - constrain practical use to ≤40 MHz in synchronous bus applications with trace-length-induced skew.
Does CY74FCT377CTSOCTE4 support partial power-down via Ioff?
Yes, CY74FCT377CTSOCTE4 includes Ioff circuitry that actively disables all outputs when VCC = 0 V, preventing reverse current flow from live buses into the unpowered device. This feature is validated per datasheet Section "Recommended Operating Conditions" and enables safe operation in hot-swap and multi-rail systems.
Is CY74FCT377CTSOCTE4 pin-compatible with older 74LS377 devices?
CY74FCT377CTSOCTE4 uses the same 20-pin SOIC (DW) footprint and identical pinout as 74LS377, including CE, CP, D0–D7, O0–O7, VCC, and GND assignments. However, it requires tighter VCC regulation (4.75–5.25 V vs. 4.75–5.5 V) and delivers higher drive strength - direct substitution is electrically valid but may require verification of bus loading and timing margins.
What is the meaning of "CT" in CY74FCT377CTSOCTE4?
The "CT" suffix in CY74FCT377CTSOCTE4 denotes the commercial-temperature, 5.2-ns speed grade variant of the FCT377 register family. It indicates guaranteed tPLH/tPHL ≤ 5.2 ns at VCC = 5 V and TA = 25°C, distinguishing it from "AT" (7.2 ns) and "T" (13 ns) variants - all share identical logic function and pinout.
Can CY74FCT377CTSOCTE4 drive standard TTL loads directly?
Yes, CY74FCT377CTSOCTE4 is fully TTL-compatible: its VOH (≥2.4 V at IOH = –32 mA) and VOL (≤0.55 V at IOL = 64 mA) meet or exceed TTL voltage thresholds, and its 64-mA sink capability exceeds standard TTL fan-out requirements. It can drive up to 16 standard TTL inputs per output without external buffers.
CY74FCT377CTSOCTE4 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:
- 5.2ns @ 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
CY74FCT377CTSOCTE4 FAQ
1.How can I place an order for CY74FCT377CTSOCTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT377CTSOCTE4 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 CY74FCT377CTSOCTE4 reliable?
The price and inventory of CY74FCT377CTSOCTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT377CTSOCTE4 is usually 5 days.
3.What payment methods are accepted for CY74FCT377CTSOCTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT377CTSOCTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT377CTSOCTE4?
CY74FCT377CTSOCTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT377CTSOCTE4 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 CY74FCT377CTSOCTE4?
For technical support, including CY74FCT377CTSOCTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT377CTSOCTE4 requirements.
6.How does Aetrix verify that CY74FCT377CTSOCTE4 is sourced from the original manufacturer or authorized distributors?
All CY74FCT377CTSOCTE4 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 CY74FCT377CTSOCTE4 meets industry standards.
7.What is the process for return or replacement of CY74FCT377CTSOCTE4?
All CY74FCT377CTSOCTE4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT377CTSOCTE4, 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 CY74FCT377CTSOCTE4 part is unused and in its original packaging.
Return procedure for CY74FCT377CTSOCTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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