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Diodes Incorporated PI74FCT374ATQ
- Part No.:
- PI74FCT374ATQ
- Manufacturer:
- Diodes Incorporated
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI74FCT374ATQ.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,339
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Product details
Overview
PI74FCT374ATQ from Pericom Semiconductor is an octal D-type flip-flop register with 3-state outputs, designed for high-speed data latching and bus interface in 5V TTL-compatible systems. It features 25Ω series output resistors to suppress signal reflections, operates across –40°C to +85°C, supports 4.5ns max propagation delay (tPLH/tPHL), and uses a single positive-edge-triggered clock (CP) with active-low output enable (OE). It is used in backplane data buffering and memory address latching.
For engineers reviewing the PI74FCT374ATQ datasheet, PI74FCT374ATQ pinout, PI74FCT374ATQ application, or PI74FCT374ATQ equivalent, key selection criteria include its 25Ω integrated output termination, low ground bounce, hysteresis-equipped inputs, and compatibility with FAST™-series logic while delivering lower power and higher speed.
Technical Context
This device implements eight edge-triggered D flip-flops sharing a common buffered clock (CP) and a shared active-low 3-state output enable (OE). Data on D0–D7 is captured on the LOW-to-HIGH transition of CP and appears at O0–O7 when OE is asserted low; otherwise outputs enter high-impedance state.
It integrates 25Ω series resistors on all eight outputs-unique to the FCT2XXX subfamily-to dampen transmission-line reflections without external termination. Input hysteresis (200 mV) improves noise immunity, and TTL-level I/O ensures seamless interfacing with legacy 5V logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 4.5 ns max at VCC = 5.0 V, CL = 50 pF - enables ≤222 MHz register operation in critical timing paths |
| Output Enable/Disable Time | tPZH/tPHZ = 5.5 ns max - allows fast bus turnaround in multiplexed data transfer |
| Input Hysteresis | 200 mV - rejects noise spikes up to ±100 mV on D and CP inputs without false triggering |
| Supply Current (ICC) | 500 µA max quiescent - reduces standby power in always-on control logic |
| Output Termination | 25Ω series resistor per output - eliminates need for external 33–50Ω PCB series resistors |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and telecom equipment |
| IOH/IOL Drive | –15 mA / +64 mA - drives standard TTL loads directly without buffer amplification |
Pinout & Package
PI74FCT374ATQ is housed in a 20-pin 150-mil-wide plastic TQSOP (Thin Quad Small Outline Package), designated "Q" suffix, with 0.65 mm lead pitch and exposed pad optional per manufacturer variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-Low Output Enable | Drives all O0–O7 into high-Z when HIGH; enables true-level outputs when LOW |
| 2–9 (D0–D7) | Data Inputs | Asynchronous inputs sampled on rising edge of CP; meet 2.0 ns setup / 1.0 ns hold at max speed |
| 10 (GND) | Ground Reference | Primary return path for logic and output current; decoupling capacitor must be placed adjacent |
| 11 (VCC) | Power Supply | 5.0 V ±5% supply; requires local 0.1 µF ceramic bypass between Pins 10 and 11 |
| 12–19 (O0–O7) | 3-State True Outputs | Register outputs with integrated 25Ω series resistance; drive buses directly without external termination |
| 20 (CP) | Clock Input | Edge-triggered input; data transfers on LOW-to-HIGH transition; hysteresis improves jitter tolerance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25Ω output series resistors | Eliminates discrete termination components, reducing BOM count and PCB area in high-speed parallel buses |
| TTL-compatible I/O levels | VIH = 2.0 V min, VIL = 0.8 V max - interoperates with 74LS, 74F, and other 5V logic families without level shifters |
| Low ground bounce (LGB) design | Minimizes simultaneous switching noise during multi-bit output transitions, improving signal integrity |
| Hysteresis on all inputs | 200 mV threshold window - prevents chatter on slow-rising or noisy clock/data lines |
| Industrial temperature range | –40°C to +85°C operation - suitable for base station controllers, PLC I/O modules, and motor drives |
Applications
| Memory Address Latching | Backplane Data Buffering |
|---|---|
Use Scenario: Holding microprocessor address bus values during memory access cycles in 80x86 or Z80-based systems. IC Role / Device Role / Timing Role: Edge-triggered latch capturing 8-bit address segments synchronized to CPU ALE or clock edge. Use Value: 4.5 ns propagation delay ensures setup compliance with 25 MHz bus timing; 25Ω outputs suppress ringing on long PCB traces. |
Use Scenario: Isolating and driving parallel data between CPU and peripheral cards across a 20+ cm backplane. IC Role / Device Role / Timing Role: Bidirectional bus interface register enabling controlled data flow with OE-gated 3-state outputs. Use Value: Integrated 25Ω termination maintains signal fidelity at >50 Mbps without added resistors; low ground bounce prevents cross-talk. |
| Industrial I/O Expansion | Digital Control Panel Interface |
Use Scenario: Expanding GPIO capability in programmable logic controllers to drive relays, indicators, or sensors. IC Role / Device Role / Timing Role: Synchronized output latch receiving parallel commands from MCU and asserting them to field devices. Use Value: –40°C to +85°C rating ensures reliability in uncontrolled cabinet environments; 64 mA output drive handles LED/relay loads directly. |
Use Scenario: Capturing button press states or DIP switch settings in operator panels before scanning by host controller. IC Role / Device Role / Timing Role: Input register sampling 8-bit front-panel status on clock edge, holding until host reads via data bus. Use Value: Input hysteresis rejects ESD-induced glitches on panel wiring; TTL compatibility simplifies integration with existing 5V UI logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT374CTQ | No integrated 25Ω output resistors; higher output drive (±64 mA) but requires external termination | Suitable where board layout allows discrete 33Ω series resistors and lower dynamic power is prioritized | Select when cost-sensitive designs can accommodate external termination and do not require reflection suppression out-of-box |
| SN74ACT374N | AC-family CMOS; 5V-only, no hysteresis; tPLH = 8.5 ns max; no built-in series resistors | Better noise margin than TTL but lacks integrated termination and industrial temp grade | Prefer for commercial-grade systems needing higher noise immunity than FCT but not requiring 25Ω damping or extended temperature range |
Compared with PI74FCT374ATQ, the 74FCT374CTQ omits on-die termination-increasing layout complexity but lowering die cost-while SN74ACT374N trades industrial temperature support and reflection control for improved input noise rejection in benign environments.
Availability
PI74FCT374ATQ is available at Aetrix Electronics and suitable for industrial control systems, telecom backplane interfaces, and memory subsystems requiring stable component supply, long-term lifecycle assurance, and verified 5V logic compatibility.
Supply support for PI74FCT374ATQ 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
Pericom Semiconductor (now part of Diodes Incorporated) specialized in high-speed interface and timing solutions, with expertise in CMOS logic, PCIe switches, and USB signal integrity products.
The PI74FCT series was engineered for drop-in replacement of bipolar FAST™ logic in 5V systems-delivering superior speed, lower power, and enhanced signal integrity through integrated termination and noise-suppressing design.
FAQ
Is PI74FCT374ATQ pin-compatible with standard 74FCT374 devices?
Yes-PI74FCT374ATQ shares identical pinout and function with industry-standard 20-pin octal D registers including 74FCT374, 74FCT574, and 74FCT534. The "AT" speed grade and "Q" TQSOP package maintain mechanical and electrical compatibility while offering tighter timing specs and integrated 25Ω termination.
Can PI74FCT374ATQ operate at 3.3V?
No-PI74FCT374ATQ is specified only for 5.0 V ±5% operation. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive characteristics are optimized for 5V TTL signaling. For 3.3V systems, consider the PI74FCT374ATL (LV version) or compatible ALVC-series alternatives.
What is the purpose of the 25Ω series resistor on each output?
The 25Ω resistor is monolithically integrated into each output driver to match typical PCB trace impedance and suppress signal reflections caused by fast edges on unterminated lines. This eliminates the need for external 33–50Ω series resistors, reducing component count and improving signal integrity in parallel bus applications.
Does PI74FCT374ATQ support hot-swap or live-insertion?
No-PI74FCT374ATQ lacks hot-swap protection features such as power-up 3-state or undervoltage lockout. Its outputs may enter undefined states during partial power application. For hot-plug applications, use dedicated hot-swap buffers or add external isolation circuitry and power sequencing controls.
PI74FCT374ATQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- 6.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Iq):
- 500 µA
- Input Capacitance:
- 6 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
PI74FCT374ATQ FAQ
1.How can I place an order for PI74FCT374ATQ through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT374ATQ 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 PI74FCT374ATQ reliable?
The price and inventory of PI74FCT374ATQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT374ATQ is usually 5 days.
3.What payment methods are accepted for PI74FCT374ATQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT374ATQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT374ATQ?
PI74FCT374ATQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT374ATQ 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 PI74FCT374ATQ?
For technical support, including PI74FCT374ATQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT374ATQ requirements.
6.How does Aetrix verify that PI74FCT374ATQ is sourced from the original manufacturer or authorized distributors?
All PI74FCT374ATQ 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 PI74FCT374ATQ meets industry standards.
7.What is the process for return or replacement of PI74FCT374ATQ?
All PI74FCT374ATQ units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT374ATQ, 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 PI74FCT374ATQ part is unused and in its original packaging.
Return procedure for PI74FCT374ATQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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