My Inquiry
My Account
Texas Instruments CY74FCT377ATQCT
- Part No.:
- CY74FCT377ATQCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT377ATQCT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,097
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY74FCT377ATQCT from Texas Instruments is an 8-bit edge-triggered D-type flip-flop register with clock enable (CE), designed for synchronous data latching in TTL-compatible digital systems. It features 64-mA sink / 32-mA source output drive, 7.2-ns propagation delay (tPLH/tPHL), and operates over –40°C to +85°C. Used in address/data synchronization, bus interface buffering, and control logic sequencing.
For engineers reviewing the CY74FCT377ATQCT datasheet, CY74FCT377ATQCT pinout, CY74FCT377ATQCT application, or CY74FCT377ATQCT equivalent, key selection criteria include Ioff-enabled partial-power-down support, matched rise/fall times for EMI reduction, edge-rate control for noise immunity, and QSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The CY74FCT377ATQCT 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 - requiring only one setup time stability for CE prior to clock edge.
It integrates Ioff circuitry that disables outputs during power-down to prevent backflow current, supports TTL-level inputs/outputs (VIH = 2 V min, VOL = 0.55 V max at 64 mA), and uses edge-rate control to limit di/dt and improve noise margin without external termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit edge-triggered D-type register with clock enable |
| Propagation Delay | 7.2 ns max (tPLH/tPHL at VCC = 5 V, TA = 25°C) - enables reliable timing in 100-MHz system clocks |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads or multiple TTL inputs directly |
| Supply Voltage | 4.75 V to 5.25 V - tight tolerance ensures stable operation across industrial voltage rails |
| Ioff Support | Active at VCC = 0 V - blocks current flow during partial power-down, protecting powered subsystems |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - meets JEDEC JESD22-A114/A115/C101 for robust board handling |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
Pinout & Package
Package: SSOP-20 (DBQ), 0.635-mm pitch, 7.2-mm width, RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CE) | Clock Enable (active-low) | Enables synchronous loading only when low; must be stable ≥3.5 ns before CP↑ |
| 2–9 (D0–D7) | Data inputs | Independent D inputs sampled at CP↑; each requires ≥2 ns setup before clock edge |
| 10 (GND) | Ground reference | Primary return path for all logic and output currents; decoupling required within 5 mm |
| 11 (VCC) | Power supply | 5-V nominal supply; requires local 0.1-µF ceramic bypass capacitor adjacent to pin |
| 12–19 (O0–O7) | Registered outputs | Non-inverting Q outputs updated on CP↑; capable of driving 64 mA sink load |
| 20 (CP) | Clock input | Buffered edge-triggered clock; low-to-high transition latches all D inputs simultaneously |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Controlled Outputs | Controlled slew rate reduces simultaneous switching noise (SSN) and improves signal integrity on shared buses |
| Ioff Partial-Power-Down | Outputs enter high-impedance state when VCC = 0 V, enabling safe hot-insertion and mixed-voltage domain isolation |
| Matched Rise/Fall Times | Ensures symmetrical waveform edges (tr ≈ tf), minimizing duty-cycle distortion in clock distribution paths |
| TTL-Compatible Interface | Accepts standard TTL VIH/VIL thresholds and delivers TTL VOH/VOL levels - eliminates level-shifter requirements |
| ESD Protection | Exceeds JESD22-A114 (2000-V HBM), allowing direct handling in non-ESD-controlled assembly environments |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Latching sensor status bits (e.g., door open/closed, seatbelt fastened) into a microcontroller's parallel input port under noisy 12-V vehicle electrical environment. IC Role / Device Role / Timing Role: CY74FCT377ATQCT acts as a synchronized input register, isolating MCU GPIO from transients while aligning sampling to system clock edges. Use Value: Ioff prevents backfeed during MCU sleep cycles; 64-mA sink capability drives long traces without added buffers; ESD rating withstands automotive harness coupling events. | Use Scenario: Capturing multiplexed dashboard switch states (headlight, wiper, HVAC) before routing to CAN controller via parallel-to-serial conversion. IC Role / Device Role / Timing Role: CY74FCT377ATQCT serves as a debounced, clock-synchronized latch stage, ensuring glitch-free capture aligned to master timing domain. Use Value: Edge-rate control suppresses radiated emissions from switch bounce; CE pin allows selective registration per subsystem; TTL compatibility interfaces directly with legacy switch matrix drivers. |
| Telecom Line Card Buffering | Test Equipment Digital Pattern Generator |
Use Scenario: Holding configuration data (e.g., gain settings, filter coefficients) for analog front-end ICs on high-speed telecom line cards subject to thermal cycling and vibration. IC Role / Device Role / Timing Role: CY74FCT377ATQCT functions as a nonvolatile shadow register, updating DAC control words synchronously with system reset or command strobe. Use Value: Matched rise/fall times minimize jitter injection into precision analog paths; –40°C to +85°C rating ensures reliability across chassis temperature gradients. | Use Scenario: Generating deterministic 8-bit stimulus patterns for IC functional testing, where precise edge alignment and repeatable timing are critical for pass/fail validation. IC Role / Device Role / Timing Role: CY74FCT377ATQCT provides deterministic, clock-edge-aligned pattern storage - acting as a static pattern source synchronized to test clock generator. Use Value: 7.2-ns tPLH/tPHL guarantees sub-10-ns timing resolution; 32-mA source drive ensures clean logic levels into 50-Ω scope probes or FPGA inputs. |
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 |
|---|---|---|---|
| CY74FCT377ATSOCT | Same logic, SOIC-20 package (7.5-mm width, 1.27-mm pitch); higher θJA (58°C/W vs. 68°C/W) | Better suited for through-hole prototyping or legacy wave-solder processes; lower pin density than SSOP | Select when board layout prioritizes manual rework, thermal margin over space, or existing SOIC footprint reuse. |
| SN74FCT377TQCT | Same function but FCT377T speed grade (5.2-ns delay); no Ioff support; 32-mA sink / 12-mA source drive | Limited to fully powered systems; unsuitable for partial-power-down architectures or hot-swap designs | Choose only if maximum speed is critical and power sequencing is strictly controlled across all rails. |
Compared with CY74FCT377ATQCT, CY74FCT377ATSOCT offers identical timing and Ioff but trades compact SSOP size for easier hand-soldering, while SN74FCT377TQCT sacrifices power-down safety and drive strength for faster propagation - making CY74FCT377ATQCT the optimal balance for industrial control and mixed-power-domain applications.
Availability
CY74FCT377ATQCT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, telecom line card buffering, and test equipment digital pattern generation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for CY74FCT377ATQCT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The CY74FCT377ATQCT belongs to TI's FCT logic family - engineered for high-noise-immunity, TTL-compatible interfacing in mission-critical industrial control and infrastructure equipment.
FAQ
What is the maximum clock frequency supported by CY74FCT377ATQCT?
CY74FCT377ATQCT supports a minimum clock pulse width (tw) of 6 ns (high or low), enabling reliable operation up to approximately 83 MHz in ideal conditions. Real-world maximum frequency depends on setup/hold timing margins, load capacitance, and PCB trace routing - with typical system-level use observed at ≤50 MHz for robust timing closure.
Does CY74FCT377ATQCT support hot-swap or partial-power-down operation?
Yes, CY74FCT377ATQCT includes Ioff circuitry that disables outputs when VCC = 0 V, preventing damaging current backflow during hot-swap or partial-power-down sequences. This feature is verified per datasheet Section "Ioff Supports Partial-Power-Down Mode Operation" and confirmed in absolute maximum ratings (Ioff ≤ ±1 µA at VCC = 0 V, VOUT = 4.5 V).
What is the pin 1 orientation for CY74FCT377ATQCT in tape-and-reel packaging?
CY74FCT377ATQCT in SSOP-20 (DBQ) tape-and-reel format uses Quadrant Q1 for pin 1 orientation, as specified in TI's Package Materials Information document dated 10-Aug-2026. This ensures consistent automated placement alignment during SMT assembly.
Can CY74FCT377ATQCT drive standard TTL loads directly?
Yes, CY74FCT377ATQCT is fully TTL-compatible: it accepts TTL input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and delivers TTL output levels (VOH ≥ 2.4 V at –32 mA, VOL ≤ 0.55 V at 64 mA), enabling direct connection to legacy 74LS/74ALS devices without level shifters or pull-up resistors.
What is the thermal resistance (θJA) of CY74FCT377ATQCT in its QSOP package?
The junction-to-ambient thermal resistance (θJA) for CY74FCT377ATQCT in the SSOP-20 (DBQ) package is 68°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad, 2-oz copper) and guides thermal design for continuous operation at full output drive.
CY74FCT377ATQCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 4.75 ~ 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
CY74FCT377ATQCT FAQ
1.How can I place an order for CY74FCT377ATQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT377ATQCT 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 CY74FCT377ATQCT reliable?
The price and inventory of CY74FCT377ATQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT377ATQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT377ATQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT377ATQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT377ATQCT?
CY74FCT377ATQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT377ATQCT 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 CY74FCT377ATQCT?
For technical support, including CY74FCT377ATQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT377ATQCT requirements.
6.How does Aetrix verify that CY74FCT377ATQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT377ATQCT 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 CY74FCT377ATQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT377ATQCT?
All CY74FCT377ATQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT377ATQCT, 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 CY74FCT377ATQCT part is unused and in its original packaging.
Return procedure for CY74FCT377ATQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY74FCT377ATQCT Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
