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Diodes Incorporated PI74FCT573ATS
- Part No.:
- PI74FCT573ATS
- Manufacturer:
- Diodes Incorporated
- Category:
- Latches
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PI74FCT573ATS.pdf
- Description:
- IC D-TYPE TRANSP SGL 8:8 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,825
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Product details
Overview
PI74FCT573ATS from Pericom Semiconductor is an 8-bit octal transparent latch with 3-state outputs, designed for bus-oriented digital systems where data isolation and controlled latching are required. It features TTL-compatible input/output levels, 5V supply operation, industrial temperature range (–40°C to +85°C), propagation delay ≤8.0 ns (tPLH/tPHL), and low static power consumption (ICC ≤500 µA). It is used in microprocessor data bus buffering and address/data separation in embedded controllers.
For engineers reviewing the PI74FCT573ATS datasheet, PI74FCT573ATS pinout, PI74FCT573ATS application, or PI74FCT573ATS equivalent, key selection criteria include latch enable polarity (active HIGH), output enable polarity (active LOW), 3-state bus drive capability, ground bounce suppression, and compatibility with FAST™-series logic replacements in legacy 5V systems.
Technical Context
The PI74FCT573ATS implements a transparent latch architecture: when 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. OE controls output tri-state behavior - outputs go high-impedance when OE is HIGH.
It uses Fast CMOS technology with hysteresis on all inputs (200 mV), TTL-level thresholds (VIH = 2.0 V, VIL = 0.8 V), and rail-to-rail output swing (VOH ≥ 2.4 V, VOL ≤ 0.55 V at IOL = 64 mA). Its design targets noise immunity, low power, and compatibility with bipolar FAST logic while reducing supply current by >90%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit transparent latch with 3-state outputs - enables bidirectional bus control and data hold without clock edge dependency. |
| Supply Voltage | 5.0 V ±5% - operates reliably across standard 5V TTL/CMOS systems; supports up to 7.0 V absolute max for transient tolerance. |
| Propagation Delay | tPLH/tPHL ≤8.0 ns (CL = 50 pF) - ensures timing compatibility with 125 MHz+ bus cycles in synchronous designs. |
| Output Drive | IOL = 64 mA (VOL ≤ 0.55 V), IOH = –15 mA (VOH ≥ 2.4 V) - drives standard TTL loads and multiple CMOS inputs without external buffers. |
| Input Hysteresis | 200 mV - suppresses noise-induced glitches on LE and OE control lines in electrically noisy industrial environments. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade applications including motor control, PLC I/O modules, and instrumentation. |
| Quiescent Current | ICC ≤ 500 µA - reduces standby power in always-on systems such as real-time data loggers and sensor concentrators. |
Pinout & Package
PI74FCT573ATS is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.300-inch body width and standard JEDEC MS-013 footprint. Pin spacing is 0.050 inch (1.27 mm), compatible with automated PCB assembly and legacy socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-LOW control: asserts high-impedance state on all O0–O7 outputs when HIGH; enables bus sharing. |
| 2–9 (D0–D7) | Data Inputs | Asynchronous parallel inputs accepting TTL/CMOS logic levels; routed to outputs only when LE is HIGH. |
| 10 (GND) | Ground Reference | Primary signal and power return path; decoupling capacitor must be placed adjacent to this pin. |
| 11 (VCC) | Power Supply | +5V supply input; requires local 0.1 µF ceramic decoupling between pins 10 and 11 per best practice. |
| 12–19 (O0–O7) | 3-State Outputs | True (non-inverted) latched outputs; tri-stated when OE = HIGH or powered down; drive bus loads directly. |
| 20 (LE) | Latch Enable Input | Active-HIGH control: enables transparency when HIGH; captures and holds D0–D7 on falling edge of LE. |
Key Features
| Feature | Design Value |
|---|---|
| Pin compatibility with bipolar FAST™ Series | Direct drop-in replacement for 74F373/74F573 in existing 5V layouts, enabling power and speed upgrades without redesign. |
| Low ground bounce outputs | Controlled slew rate and internal layout minimize simultaneous switching noise - critical for stable ADC reference and analog subsystems. |
| TTL input and output levels | Guaranteed VIH ≥ 2.0 V and VOL ≤ 0.55 V at full load - ensures interoperability with legacy 74LS/74ALS and microcontroller GPIOs. |
| Hysteresis on all inputs | 200 mV input threshold margin - prevents chatter on slow-rising control signals (e.g., from mechanical switches or long traces). |
| Industrial temperature range | Validated operation from –40°C to +85°C - suitable for uncontrolled environments like factory floors and outdoor enclosures. |
Applications
| Microprocessor Data Bus Interface | Address/Data Multiplexing |
|---|---|
|
Use Scenario: Isolating and latching data between a microprocessor and peripheral memory or I/O devices during shared bus cycles. IC Role / Device Role / Timing Role: Acts as a data bus transceiver latch - captures processor write data on LE falling edge and presents it to peripherals while maintaining bus integrity. Use Value: Eliminates need for external bus buffers and simplifies timing by providing deterministic setup/hold (tSU = 2.0 ns, tH = 1.5 ns) in 5V MPU systems. |
Use Scenario: Separating multiplexed address and data signals on an 8086/8088-style bus using ALE-driven latching. IC Role / Device Role / Timing Role: Latches lower-order address bits (AD0–AD7) on ALE assertion, freeing the bus for data transfer in subsequent cycles. Use Value: Enables single-bus architecture with precise 6.0 ns minimum LE pulse width support - meets Intel 8086 timing requirements without added logic. |
| Industrial I/O Expansion Module | Legacy System Bus Re-timing |
|
Use Scenario: Buffering digital I/O signals in programmable logic controller (PLC) backplane modules requiring noise-immune signal routing. IC Role / Device Role / Timing Role: Provides isolated, latched I/O staging between field-side sensors/actuators and controller-side logic with configurable OE control. Use Value: Hysteresis and low ground bounce ensure reliable operation in EMI-heavy factory settings; 3-state outputs prevent bus contention during hot-swap events. |
Use Scenario: Re-timing and level-shifting signals in aging test equipment or instrumentation where FAST logic has degraded or become obsolete. IC Role / Device Role / Timing Role: Replaces failing 74F573 latches with identical pinout and improved DC/AC specs - restores timing margins without board rework. Use Value: Reduces quiescent current by >90% versus original FAST parts while maintaining sub-8 ns propagation - extends system thermal headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transparent latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74F573PC | Bipolar FAST logic; higher ICC (≈30 mA), slower tPLH (12 ns typical), no input hysteresis. | Higher power dissipation and noise sensitivity limit use in thermally constrained or EMI-prone designs. | Select only if legacy FAST compatibility is mandatory and power/noise budgets allow. |
| SN74ACT573N | Advanced CMOS; 5V-only, VIH/VIL tighter (2.0/0.8 V same), but no hysteresis and higher VOL (0.5 V @ 24 mA). | Lacks 200 mV hysteresis - less robust on slow-rising control lines; not recommended for mechanical switch interfaces. | Prefer for new 5V logic designs needing higher noise immunity than ACT but lower cost than FCT variants. |
Compared with 74F573PC and SN74ACT573N, the PI74FCT573ATS delivers superior noise immunity via input hysteresis, lower static power (500 µA vs 30 mA), and faster disable time (tPLZ ≤5.0 ns), making it optimal for industrial bus isolation where reliability and efficiency are prioritized over raw speed.
Availability
PI74FCT573ATS is available at Aetrix Electronics and suitable for microprocessor bus interfacing, industrial I/O expansion, legacy system refurbishment, and address/data demultiplexing requiring stable component supply and long-term industrial-grade availability.
Supply support for PI74FCT573ATS 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-performance interface, timing, and signal integrity solutions, acquired by Diodes Incorporated in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.
The PI74FCT573ATS belongs to the FCT (Fast CMOS Technology) logic family, engineered specifically to replace bipolar FAST logic in 5V systems with lower power, higher noise immunity, and improved timing margins - targeting industrial control, test equipment, and embedded computing.
FAQ
What is the function of the LE and OE pins on the PI74FCT573ATS?
The LE (Latch Enable) pin is active HIGH and controls data transparency: when HIGH, D0–D7 pass through to O0–O7; on the falling edge, the current input state is latched. The OE (Output Enable) pin is active LOW and controls output drivers: when HIGH, all outputs enter high-impedance state, isolating the device from the bus. Both pins operate independently and support asynchronous control.
Can PI74FCT573ATS operate at 3.3V supply voltage?
No. The PI74FCT573ATS is specified only for 5.0 V ±5% operation (4.75 V to 5.25 V). Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive characteristics are optimized for 5V TTL/CMOS compatibility. Operation below 4.75 V may result in undefined logic states, increased propagation delay, or failure to meet VOL/VOH specifications.
How does the PI74FCT573ATS differ from the PI74FCT373ATS?
The PI74FCT573ATS has non-inverting outputs (O0–O7 follow D0–D7), while the PI74FCT373ATS provides true/complementary outputs (O0–O7 and O0̅–O7̅). Their pinouts differ: PI74FCT573ATS places D0–D7 on pins 2–9 and O0–O7 on pins 12–19; PI74FCT373ATS interleaves D and O pins. They are not pin-compatible and serve distinct bus architectures - 573 for unidirectional latching, 373 for bidirectional or complementary signaling.
Is thermal derating required for continuous operation at +85°C ambient?
Yes. While the device is rated for operation up to +85°C ambient, power dissipation must remain within limits: maximum 0.5 W total, with junction temperature not exceeding +125°C. At full load and high ambient, thermal design must ensure adequate PCB copper area, airflow, or heatsinking - especially when driving 64 mA per output continuously, as power loss increases with output loading and frequency.
PI74FCT573ATS 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
PI74FCT573ATS FAQ
1.How can I place an order for PI74FCT573ATS through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT573ATS 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 PI74FCT573ATS reliable?
The price and inventory of PI74FCT573ATS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT573ATS is usually 5 days.
3.What payment methods are accepted for PI74FCT573ATS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT573ATS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT573ATS?
PI74FCT573ATS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT573ATS 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 PI74FCT573ATS?
For technical support, including PI74FCT573ATS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT573ATS requirements.
6.How does Aetrix verify that PI74FCT573ATS is sourced from the original manufacturer or authorized distributors?
All PI74FCT573ATS 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 PI74FCT573ATS meets industry standards.
7.What is the process for return or replacement of PI74FCT573ATS?
All PI74FCT573ATS units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT573ATS, 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 PI74FCT573ATS part is unused and in its original packaging.
Return procedure for PI74FCT573ATS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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