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Diodes Incorporated PI74FCT373ATS
- Part No.:
- PI74FCT373ATS
- Manufacturer:
- Diodes Incorporated
- Category:
- Latches
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PI74FCT373ATS.pdf
- Description:
- IC D-TYPE TRANSP SGL 8:8 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,478
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Product details
Overview
PI74FCT373ATS from Pericom Semiconductor is an octal transparent latch with 3-state outputs, designed for bus-oriented digital systems requiring data latching and controlled bus isolation. It features TTL-compatible input/output levels, 25Ω series output resistors to suppress signal reflections, a 1.5 ns minimum propagation delay (tPLH), 8-bit parallel data path, and operates across –40°C to +85°C industrial temperature range.
For engineers reviewing the PI74FCT373ATS datasheet, PI74FCT373ATS pinout, PI74FCT373ATS application, or PI74FCT373ATS equivalent, key selection criteria include latch enable timing (tW ≥ 4.0 ns for DT grade), output disable time (tPLZ ≤ 5.0 ns), low static power (ICC ≤ 500 µA), and compatibility with legacy FAST™-series PCB footprints in TSSOP-20 package.
Technical Context
This device implements a synchronous transparent latch architecture: when Latch Enable (LE) is HIGH, inputs D0–D7 pass directly to outputs O0–O7; when LE transitions LOW, the input state at that instant is captured and held. Output Enable (OE) controls tri-state behavior independently - OE HIGH forces all outputs into high-impedance, decoupling the latch from the bus regardless of LE or data state.
The integrated 25Ω series resistor on each output terminal reduces transmission-line reflections without external termination, enabling clean signal integrity on PCB traces up to 10 cm at 50 MHz. Input hysteresis (200 mV) improves noise immunity on control lines like LE and OE, while ground-bounce suppression ensures stable logic thresholds during simultaneous switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0 V ± 5% - matches standard TTL/CMOS bus voltage, eliminates level-shifting in 5V systems |
| tPLH / tPHL | 1.5–3.8 ns (DT grade) - enables >260 MHz latch-to-latch timing in high-speed control paths |
| tSU / tH | 2.0 ns setup / 1.0 ns hold (DT grade) - supports tight timing margins with fast microcontroller GPIOs |
| tPZH / tPLZ | 1.5–5.5 ns enable/disable - allows rapid bus arbitration with sub-6 ns output visibility window |
| IOH / IOL | –15 mA / 64 mA (VOL ≤ 0.55 V) - drives standard TTL loads and 50 Ω transmission lines directly |
| ICC Quiescent | ≤ 500 µA - reduces standby power in always-on industrial controllers and instrumentation |
| Operating Temp | –40°C to +85°C - qualified for deployment in automotive under-hood ECUs and factory automation PLCs |
Pinout & Package
PI74FCT373ATS is housed in a 20-pin 173 mil wide plastic TSSOP (L20) package with exposed pad for thermal enhancement and standard JEDEC-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable (Active LOW) | Asserting LOW enables O0–O7 drivers; HIGH places all outputs in high-Z - critical for bus sharing |
| 2 (O0) | Output 0 | 3-state buffered latch output with 25Ω series resistor - ready for direct PCB trace routing |
| 3 (D0) | Data Input 0 | TTL-compatible input with 200 mV hysteresis - rejects noise on shared control/data buses |
| 4–10 (D1–D7) | Data Inputs 1–7 | Parallel 8-bit data capture path - synchronized to LE edge, independent of OE state |
| 11 (GND) | Ground Reference | Dedicated power return for logic core and output drivers - minimizes ground bounce coupling |
| 12 (VCC) | Supply Voltage | +5 V supply pin - bypass capacitor placement adjacent to this pin required for noise suppression |
| 13–19 (O1–O7) | Outputs 1–7 | Matched 3-state outputs with identical 25Ω series resistance - ensures uniform signal rise/fall times |
| 20 (LE) | Latch Enable (Active HIGH) | HIGH enables transparency; falling edge captures D0–D7 - used as clock-like strobe in bus interfaces |
Key Features
| Feature | Design Value |
|---|---|
| 25Ω series output resistors | Eliminates need for discrete 25–33Ω source terminators on each output, reducing BOM count and board area |
| TTL-compatible I/O levels | Direct interface with 74LS, 74F, and microcontroller GPIOs without level shifters or pull-ups |
| Low ground bounce | Minimizes simultaneous switching noise on shared VCC/GND planes - critical for mixed-signal systems |
| Hysteresis on all inputs | 200 mV input threshold margin prevents chatter on noisy LE/OE control lines in electrically harsh environments |
| Pin compatibility with FAST™ series | Drop-in replacement for 74F373 in existing layouts - leverages legacy PCB designs while improving speed/power |
Applications
| Industrial PLC Backplane | Automotive Body Control Module |
|---|---|
|
Use Scenario: Latching sensor data from analog-to-digital converters before multiplexed transfer over a shared CAN/LIN backplane. IC Role / Device Role / Timing Role: Octal latch buffers ADC output words and synchronizes them to a central controller's read strobe via LE. Use Value: 3.8 ns max propagation delay ensures sub-260 MHz sampling alignment; 25Ω outputs suppress ringing on 15 cm backplane traces. |
Use Scenario: Isolating microcontroller GPIO banks from high-current door lock actuators and LED driver circuits. IC Role / Device Role / Timing Role: Bidirectional bus latch provides safe, timed handoff between MCU logic domain and 12V load domain using OE-controlled Z-state. Use Value: –40°C to +85°C rating guarantees operation in cabin/exterior temperature extremes; 64 mA sink capability drives LED segments directly. |
| Legacy System Emulation Board | Test Equipment Signal Conditioning |
|
Use Scenario: Emulating vintage 74F373 behavior in FPGA-based retro-computing peripherals while adding modern reliability. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement preserving original timing constraints and footprint. Use Value: Identical pinout and TTL logic levels ensure zero hardware modification; lower ICC extends battery life in portable emulators. |
Use Scenario: Capturing and holding transient test signals from oscilloscope front-ends before digitization by a slow ADC. IC Role / Device Role / Timing Role: Transparent latch freezes analog mux output at precise trigger points defined by external LE pulses. Use Value: 1.5 ns min tPLH enables <3.8 ns jitter-free capture window; high-Z outputs prevent loading of sensitive probe circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transparent latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74F373SCX | No built-in 25Ω resistors; higher VOL (0.65 V @ 20 mA); no input hysteresis | Requires external series termination; more susceptible to noise on LE/OE in EMI-heavy environments | Select when cost is primary and board space allows discrete termination resistors |
| SN74ACT373N | Higher VCC range (4.5–5.5 V); faster tPLH (1.2 ns typ); no 25Ω resistors; ACT logic family | Better speed/power trade-off but lacks reflection suppression - needs careful layout or external termination | Select for new designs targeting maximum speed where signal integrity is managed at PCB level |
Compared with 74F373SCX and SN74ACT373N, PI74FCT373ATS uniquely integrates 25Ω output resistors and input hysteresis - delivering plug-and-play signal integrity and noise immunity without layout overhead or BOM additions.
Availability
PI74FCT373ATS is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and legacy system emulation boards requiring stable component supply, long-term lifecycle support, and guaranteed pin compatibility with FAST™-series designs.
Supply support for PI74FCT373ATS 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 was a fabless provider of high-speed interface and timing solutions, acquired by Diodes Incorporated in 2016; its FCT logic portfolio remains widely deployed in industrial and automotive systems.
The PI74FCT series targets bus-oriented digital systems needing TTL-compatible speed, low power, and robust signal integrity - specifically engineered for backplane, control, and data acquisition applications where reliability and drop-in upgradeability matter.
FAQ
What is the function of the 25Ω series resistor on each output?
The 25Ω resistor is monolithically integrated into each output driver stage to match typical PCB trace impedance and suppress signal reflections. This eliminates the need for external series termination resistors, reducing component count, board area, and potential stub effects - especially beneficial for traces longer than 5 cm operating above 25 MHz.
Can PI74FCT373ATS drive standard TTL loads directly?
Yes. With VOH ≥ 2.4 V at –15 mA and VOL ≤ 0.55 V at 64 mA, it meets or exceeds standard TTL voltage and current requirements. Its 25Ω series resistance does not impair DC drive capability - the resistor is placed inside the output stage, so loaded VOH/VOL specifications already account for its effect.
How does the input hysteresis improve system reliability?
The 200 mV hysteresis on all inputs (LE, OE, D0–D7) creates distinct HIGH and LOW switching thresholds, preventing oscillation or metastability when control signals cross the logic threshold slowly or in presence of noise. This is especially valuable on long traces or in electrically noisy environments like motor drives or automotive cabins.
Is PI74FCT373ATS compatible with 3.3V logic systems?
No. It is strictly a 5V-only device: VCC must be 5.0 V ± 5%, and inputs require TTL-level thresholds (VIH = 2.0 V, VIL = 0.8 V). Interfacing with 3.3V systems requires level translation - either dedicated translators or resistor-divider networks verified for timing compliance.
PI74FCT373ATS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 8:8
- Output Type:
- Tri-State
- Voltage - Supply:
- 4.75V ~ 5.25V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 1.5ns
- Current - Output High, Low:
- 15mA, 64mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
PI74FCT373ATS FAQ
1.How can I place an order for PI74FCT373ATS through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT373ATS 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 PI74FCT373ATS reliable?
The price and inventory of PI74FCT373ATS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT373ATS is usually 5 days.
3.What payment methods are accepted for PI74FCT373ATS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT373ATS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT373ATS?
PI74FCT373ATS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT373ATS 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 PI74FCT373ATS?
For technical support, including PI74FCT373ATS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT373ATS requirements.
6.How does Aetrix verify that PI74FCT373ATS is sourced from the original manufacturer or authorized distributors?
All PI74FCT373ATS 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 PI74FCT373ATS meets industry standards.
7.What is the process for return or replacement of PI74FCT373ATS?
All PI74FCT373ATS units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT373ATS, 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 PI74FCT373ATS part is unused and in its original packaging.
Return procedure for PI74FCT373ATS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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