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Home > Products > Integrated Circuits (ICs) > Logic > Latches

Diodes Incorporated PI74FCT16373ATA

Name: PI74FCT16373ATA
Brand: Diodes Incorporated
SKU: PI74FCT16373ATA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI74FCT16373ATA

Manufacturer:: Diodes Incorporated

Category:: Latches

Package:: 48-TFSOP (0.240", 6.10mm Width)

Datasheet:: PI74FCT16373ATA.pdf

Description:: IC 16-BIT TRANS LATCH 48TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PI74FCT16373ATA from Pericom Semiconductor is a 16-bit transparent latch with 3-state outputs, designed for bus-oriented applications in industrial and telecom backplane systems. It features high-current drive (–32 mA IOH / 64 mA IOL), power-off disable for live insertion, <1.0 V typical output ground bounce at 5 V, and operates across –40°C to +85°C with 5 V ±10% supply.

For engineers reviewing the PI74FCT16373ATA datasheet, PI74FCT16373ATA pinout, PI74FCT16373ATA application, or PI74FCT16373ATA equivalent, key selection criteria include latch enable timing (min 3.0 ns tW HIGH), output skew (<0.5 ns), dual 8-bit/16-bit configuration flexibility, and compatibility with TTL-level inputs in high-noise digital backplanes.

Technical Context

The device implements two independent 8-bit transparent latch sections, each controlled by dedicated Latch Enable (xLE, active-HIGH) and Output Enable (xOE, active-LOW) signals - enabling simultaneous or staggered latching of data across 16 bits. Its CMOS input structure includes hysteresis (100 mV) for noise immunity on control lines.

All outputs are 3-state with fast enable/disable times (tPZH ≤ 4.4 ns, tPHZ ≤ 4.0 ns at commercial grade), and the power-off disable feature ensures outputs remain high-impedance when VCC = 0 V, supporting hot-swap capability in modular chassis designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Supply	5 V ±10% - supports standard TTL-compatible logic rails without regulation overhead
Output Drive	–32 mA IOH / 64 mA IOL - drives heavy capacitive loads (e.g., 50 pF buses) without external buffers
t_W (LE Pulse)	Min 3.0 ns (16373CT grade) - enables high-speed latching in >100 MHz data capture windows
t_PLH/t_PHL	1.5–4.2 ns (CL = 50 pF) - ensures sub-5 ns propagation for deterministic timing closure
V_IL/V_IH	0.8 V / 2.0 V - compatible with TTL and 5 V CMOS logic families without level shifting
Input Hysteresis	100 mV - suppresses false triggering from slow-rising or noisy control signals (e.g., backplane LE)
Operating Temp	–40°C to +85°C - qualified for industrial-grade embedded control and telecom infrastructure

Pinout & Package

PI74FCT16373ATA is housed in a 48-pin 240-mil wide plastic TSSOP (A suffix), with 0.5 mm pitch and exposed pad not present. Pin numbering follows standard dual-row TSSOP layout with GND and VCC distributed across both sides for low-inductance power delivery.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Active-LOW Output Enable	Controls 3-state output drivers per 8-bit section; enables independent bus isolation
1LE, 2LE	Active-HIGH Latch Enable	Enables transparency; latches data on falling edge (when LE transitions LOW)
1D0–1D7, 2D0–2D7	Data Inputs	16 single-ended TTL/CMOS-compatible inputs; hysteresis improves noise margin
1O0–1O7, 2O0–2O7	3-State Outputs	High-drive, power-off disabled outputs; support live insertion into powered backplanes
GND (Pins 4, 9, 16, 21, 28, 33, 40, 45)	Ground Reference	Eight dedicated GND pins minimize ground bounce and improve signal integrity
VCC (Pins 7, 13, 20, 26, 32, 39, 43)	Power Supply	Seven VCC pins provide low-impedance path for dynamic current demands during switching

Key Features

Feature	Design Value
Power-Off Output Disable	Outputs enter high-Z state at VCC = 0 V - eliminates bus contention during hot-swap board insertion
High-Current Drive	–32 mA IOH / 64 mA IOL - directly drives terminated 50 Ω transmission lines without external drivers
Low Ground Bounce	Typical VOLP < 1.0 V at 5 V - reduces simultaneous switching noise in dense backplane layouts
Dual-Section Control	Separate 1LE/1OE and 2LE/2OE - allows interleaved latching or independent 8-bit bus partitioning
TTL-Compatible Inputs	VIL = 0.8 V, VIH = 2.0 V - interfaces directly with legacy microcontrollers, FPGAs, and ASICs

Applications

Backplane Data Capture

Industrial PLC I/O Expansion

Use Scenario: Capturing parallel status data from multiple sensor modules onto a shared 16-bit backplane bus under real-time constraints.

IC Role / Device Role / Timing Role: Transparent latch synchronizes asynchronous sensor outputs to a centralized clock domain while isolating bus loading during read cycles.

Use Value: Sub-5 ns propagation and <0.5 ns output skew ensure deterministic sampling alignment across all 16 bits, eliminating metastability in time-critical diagnostics.

Use Scenario: Expanding digital I/O capacity of a programmable logic controller via modular daughterboards with shared address/data buses.

IC Role / Device Role / Timing Role: Acts as bidirectional bus interface buffer, latching command writes and holding status reads until master polling cycle.

Use Value: Power-off disable prevents bus contention when modules are inserted/removed mid-operation, meeting IEC 61131-2 hot-swap requirements.

Telecom Line Card Interface

Test Equipment Signal Conditioning

Use Scenario: Isolating and latching configuration registers on high-density line cards where multiple ASICs share a common control bus.

IC Role / Device Role / Timing Role: Provides glitch-free register access by decoupling write strobes from bus arbitration delays using separate LE/OE controls.

Use Value: Dual 8-bit sections allow independent latching of control vs. status registers, reducing bus turnaround latency by 40% versus single-latch alternatives.

Use Scenario: Conditioning parallel trigger and calibration signals in automated test equipment with mixed-voltage subsystems.

IC Role / Device Role / Timing Role: Level-translates and latches TTL-level trigger pulses before distribution to multiple DUT interfaces with matched skew.

Use Value: 100 mV input hysteresis rejects EMI-induced jitter on long trigger cables, improving measurement repeatability in noisy lab environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit transparent latch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74FCT16373CTPV	Same function but in 48-pin SSOP (V package); no power-off disable; IOH/IOL = ±24 mA	Lacks live-insertion support; higher ground bounce (~0.6 V typical) limits use in hot-swap chassis	Select when board space permits wider SSOP and hot-swap is not required
SN74ALVTH16373DGGR	TI part in 48-pin TSSOP; 3.3 V only; IOH/IOL = ±24 mA; no power-off disable	Not 5 V tolerant; incompatible with legacy 5 V backplanes; requires level-shifting	Choose only for new 3.3 V-only designs with TI ecosystem alignment

Compared with PI74FCT16373ATA, the 74FCT16373CTPV offers identical logic but lacks live-insertion capability and delivers lower drive strength, while SN74ALVTH16373DGGR mandates full system voltage migration to 3.3 V - making PI74FCT16373ATA the sole option for robust 5 V hot-swap bus interfacing.

Availability

PI74FCT16373ATA is available at Aetrix Electronics and suitable for industrial PLC expansion, telecom line card design, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PI74FCT16373ATA 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 for communications and computing infrastructure before its 2016 acquisition.

The PI74FCT series was engineered for 5 V bus buffering and latching in telecom backplanes and industrial control systems, emphasizing noise immunity, hot-swap safety, and TTL interoperability.

FAQ

Does PI74FCT16373ATA support hot-swap insertion into a live 5 V backplane?

Yes. Its power-off disable feature forces all outputs into high-impedance when VCC = 0 V, preventing bus contention during board insertion. This is verified by IOFF ≤ ±100 µA at VCC = 0 V and VIN/VOUT ≤ 4.5 V, meeting IEEE 1184 hot-swap guidelines for 5 V systems.

Can PI74FCT16373ATA be used as an 8-bit latch instead of 16-bit?

Yes. The device contains two independent 8-bit latch sections (1D0–1D7/1O0–1O7 and 2D0–2D7/2O0–2O7), each with dedicated LE and OE controls. Either section can be used standalone while the other remains unconnected or disabled, with no functional or timing penalty.

What is the maximum capacitive load this latch can drive reliably?

It is characterized for CL = 50 pF in switching tests, with tPLH/tPHL specified up to that load. At 64 mA IOL, it can drive ≥100 pF with <10% timing degradation in typical PCB layouts - confirmed by output rise/fall time data showing <3 ns under 50 pF, scaling predictably with capacitance.

Is there internal hysteresis on the Latch Enable (LE) input?

Yes. All inputs - including 1LE and 2LE - feature 100 mV hysteresis, as specified in DC Electrical Characteristics. This prevents chatter on slow-rising or noisy enable signals, especially critical in electrically noisy backplane environments where LE may route across long traces.

PI74FCT16373ATA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: 74FCT

Package/Case:: 48-TFSOP (0.240", 6.10mm Width)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: D-Type Transparent Latch

Circuit:: 8:8

Output Type:: Tri-State

Voltage - Supply:: 4.5V ~ 5.5V

Independent Circuits:: 2

Delay Time - Propagation:: 1.5ns

Current - Output High, Low:: 32mA, 64mA

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

PI74FCT16373ATA FAQ

1.How can I place an order for PI74FCT16373ATA through Aetrix?

Please submit a Request for Quotation (RFQ) for PI74FCT16373ATA 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 PI74FCT16373ATA reliable?

The price and inventory of PI74FCT16373ATA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT16373ATA is usually 5 days.

3.What payment methods are accepted for PI74FCT16373ATA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT16373ATA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI74FCT16373ATA?

PI74FCT16373ATA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI74FCT16373ATA 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 PI74FCT16373ATA?

For technical support, including PI74FCT16373ATA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT16373ATA requirements.

6.How does Aetrix verify that PI74FCT16373ATA is sourced from the original manufacturer or authorized distributors?

All PI74FCT16373ATA 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 PI74FCT16373ATA meets industry standards.

7.What is the process for return or replacement of PI74FCT16373ATA?

All PI74FCT16373ATA units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT16373ATA, 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 PI74FCT16373ATA part is unused and in its original packaging.

Return procedure for PI74FCT16373ATA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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