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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Renesas IDT74FST163244PAG

Name: IDT74FST163244PAG
Brand: Renesas
SKU: IDT74FST163244PAG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IDT74FST163244PAG

Manufacturer:: Renesas

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: IDT74FST163244PAG.pdf

Description:: IC BUS SWITCH 4 X 1:1 48TSSOP

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Product details

Overview

IDT74FST163244 from Integrated Device Technology is a 16-bit bus switch IC operating at 5.0 V ±10% with on-resistance of 5 Ω (typ), propagation delay <0.25 ns, and industrial temperature range (–40°C to +85°C). It provides zero-delay bidirectional signal routing between A and B ports under active-low enable control, used in high-speed data path isolation for backplane and memory interface applications.

For engineers reviewing the IDT74FST163244 datasheet, IDT74FST163244 pinout, IDT74FST163244 application, or IDT74FST163244 equivalent, key selection criteria include hot-insertion capability, TTL-compatible I/O levels, low 12 pF switch capacitance, ESD robustness (>2000 V HBM), and TSSOP-48 package compatibility with FCT16244T-based layouts.

Technical Context

The IDT74FST163244 implements 16 independent n-channel FET bus switches, each controlled by dedicated active-low output-enable inputs (1OE–4OE). No internal current sourcing/sinking is provided - external drivers must supply all signal current.

Its operation relies solely on gate-to-source biasing of pass transistors: conduction occurs only when V_GS > threshold, enabling true hot-insertion (V_CC = 0 V safe) and eliminating shoot-through current. Switch impedance is specified at two voltage points (0 V and 2.4 V input), confirming stable performance across TTL logic swing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	5.0 V ±10% - supports standard TTL/CMOS system rails without regulation
R_ON (typ)	5 Ω at V_IN = 0 V - ensures minimal RC delay and signal integrity for ≤100 MHz data paths
t_PLH/t_PHL	<0.25 ns - contributes negligible propagation delay beyond trace and load effects
C_I/O	12 pF (switch off) - reduces capacitive loading on driving sources during isolation
ESD Rating	>2000 V HBM - enables handling in non-ESD-controlled assembly environments
I_OUT (max)	128 mA per channel - defines maximum sustainable current without thermal derating
Operating Temp	–40°C to +85°C - qualified for industrial-grade embedded and telecom infrastructure

Pinout & Package

Package: 48-pin TSSOP (Thin Shrink Small Outline Package), lead-free and RoHS-compliant (PAG suffix).

Pin/Terminal	Circuit Role	Design Meaning
1OE–4OE	Active-low output enable controls	Four independent enables, each controlling four A↔B pairs - enables granular bus partitioning
1A1–4A4, 1B1–4B4	Switched bidirectional port terminals	16 matched A/B pairs; no directionality - signal flows A→B or B→A identically
V_CC, GND	Power and reference	Single 5 V supply; no separate I/O or analog supplies required

Key Features

Feature	Design Value
Zero-delay signal path	Propagation delay <0.25 ns - preserves timing margins in synchronous parallel buses
Hot-insertion support	V_CC = 0 V safe operation - allows live board replacement in modular systems
TTL-compatible I/O	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - interoperates directly with legacy 5 V logic families
Low dynamic power	I_C ≤ 2.4 mA (four enables toggling at 10 MHz) - minimizes local heating in dense PCB layouts
Clamp diode protection	V_IK = –0.7 V (min) - suppresses negative transients on switched lines

Applications

Memory Subsystem Isolation	Backplane Signal Routing
Use Scenario: Isolating DRAM address/data buses during memory controller reconfiguration or multi-bank arbitration. IC Role / Device Role / Timing Role: Bidirectional passive switch enabling/disabling signal continuity without buffering or level translation. Use Value: Eliminates bus contention and reduces switching noise by physically disconnecting unused memory channels.	Use Scenario: Routing high-speed control signals (e.g., JTAG, reset, clock enables) across modular backplane slots. IC Role / Device Role / Timing Role: Low-capacitance, zero-delay path selector for inter-slot communication lines. Use Value: Maintains signal edge rate and timing integrity across variable-length backplane traces.
Hot-Swappable Module Interface	Legacy Bus Extension
Use Scenario: Enabling safe insertion/removal of PCIe or CompactPCI modules while main system remains powered. IC Role / Device Role / Timing Role: Power-fault-tolerant switch isolating module-side I/O from backplane during insertion. Use Value: Prevents supply rail droop and ground bounce during hot-swap events via V_CC-independent isolation.	Use Scenario: Extending ISA or LPC bus segments between legacy CPU and peripheral daughterboards. IC Role / Device Role / Timing Role: Flow-through repeater preserving TTL voltage thresholds and drive strength. Use Value: Avoids timing skew and signal degradation caused by long trace runs or stub loads.

Memory Subsystem Isolation

Backplane Signal Routing

Use Scenario: Isolating DRAM address/data buses during memory controller reconfiguration or multi-bank arbitration.

IC Role / Device Role / Timing Role: Bidirectional passive switch enabling/disabling signal continuity without buffering or level translation.

Use Value: Eliminates bus contention and reduces switching noise by physically disconnecting unused memory channels.

Use Scenario: Routing high-speed control signals (e.g., JTAG, reset, clock enables) across modular backplane slots.

IC Role / Device Role / Timing Role: Low-capacitance, zero-delay path selector for inter-slot communication lines.

Use Value: Maintains signal edge rate and timing integrity across variable-length backplane traces.

Hot-Swappable Module Interface

Legacy Bus Extension

Use Scenario: Enabling safe insertion/removal of PCIe or CompactPCI modules while main system remains powered.

IC Role / Device Role / Timing Role: Power-fault-tolerant switch isolating module-side I/O from backplane during insertion.

Use Value: Prevents supply rail droop and ground bounce during hot-swap events via V_CC-independent isolation.

Use Scenario: Extending ISA or LPC bus segments between legacy CPU and peripheral daughterboards.

IC Role / Device Role / Timing Role: Flow-through repeater preserving TTL voltage thresholds and drive strength.

Use Value: Avoids timing skew and signal degradation caused by long trace runs or stub loads.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MC74FST163244DT	Identical pinout, same R_ON (5 Ω typ), but rated for –40°C to +85°C only - no extended temp option	Drop-in replacement where industrial temp suffices; identical layout and firmware	Select when dual-sourcing from ON Semi is required for supply chain resilience
Texas Instruments SN74FST3244DBR	Same 16-bit function and TSSOP-48 package, but higher R_ON (8 Ω max) and lower ESD rating (1500 V HBM)	Suitable for cost-sensitive industrial designs where marginal R_ON increase is acceptable	Choose when lower unit cost outweighs need for lowest possible on-resistance

Compared with IDT74FST163244, the MC74FST163244DT offers identical electrical and mechanical behavior for industrial use, while the SN74FST3244DBR trades 3 Ω higher on-resistance and reduced ESD margin for broader distributor availability and lower procurement cost.

Availability

IDT74FST163244 is available at Aetrix Electronics and suitable for memory subsystem isolation, backplane signal routing, and hot-swappable module interface applications requiring stable component supply across industrial temperature ranges.

Supply support for IDT74FST163244 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

Integrated Device Technology, Inc. (IDT) is a fabless semiconductor company specializing in timing, interface, and memory connectivity solutions for communications, computing, and industrial markets.

The IDT74FST163244 belongs to IDT's FST family of bus switches, designed specifically for zero-delay, low-noise signal routing in high-density 5 V TTL/CMOS systems where power efficiency and hot-plug safety are critical.

FAQ

What is the maximum continuous current per channel for the IDT74FST163244?

The IDT74FST163244 supports a maximum continuous channel current of 128 mA per A↔B pair, as specified in its Absolute Maximum Ratings table. This rating applies across the full industrial temperature range (–40°C to +85°C) and ensures reliable conduction without thermal runaway when driven by compliant external sources. Exceeding this current may degrade R_ON stability or accelerate wear-out.

Does the IDT74FST163244 require pull-up or pull-down resistors on its control inputs?

No, the IDT74FST163244 does not require external pull-up or pull-down resistors on its 1OE–4OE inputs. Its TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) allow direct connection to standard 5 V logic outputs. Internal input leakage is ±1 µA maximum, so clean logic-level drive from microcontrollers or FPGAs is sufficient without added biasing components.

Can the IDT74FST163244 be used with 3.3 V logic systems?

The IDT74FST163244 is specified only for 5.0 V ±10% operation and is not guaranteed for 3.3 V supply. While it may function at reduced V_CC, R_ON increases significantly, timing parameters degrade, and ESD robustness drops. For 3.3 V systems, IDT recommends the 74FST3244 variant or newer 3.3 V–compatible bus switches such as the IDT74ALVC163244.

How does the hot-insertion capability of the IDT74FST163244 work?

The IDT74FST163244 achieves hot-insertion capability because its n-channel FET switches remain fully off when V_CC = 0 V - no gate bias is applied, preventing unintended conduction or latch-up. This allows safe insertion into a live backplane, as all I/O pins float electrically until V_CC ramps up. The device draws only ±1 µA leakage current during this state, avoiding system supply disturbance.

Is the IDT74FST163244 pin-compatible with the FCT16244T?

Yes, the IDT74FST163244 is explicitly stated in its datasheet to be pin-compatible with and functionally similar to the FCT16244T. Both devices share identical 48-pin TSSOP footprints, matching A/B port assignments, and compatible 1OE–4OE enable mapping. However, the IDT74FST163244 offers lower R_ON (5 Ω vs. 7 Ω typ) and superior ESD rating (2000 V vs. 1500 V HBM), making it a performance upgrade within the same layout.

IDT74FST163244PAG Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: 74FST

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

Packaging:: Tube

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 4 x 1:1

Independent Circuits:: 4

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

IDT74FST163244PAG FAQ

1.How can I place an order for IDT74FST163244PAG through Aetrix?

Please submit a Request for Quotation (RFQ) for IDT74FST163244PAG 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 IDT74FST163244PAG reliable?

The price and inventory of IDT74FST163244PAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT74FST163244PAG is usually 5 days.

3.What payment methods are accepted for IDT74FST163244PAG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT74FST163244PAG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IDT74FST163244PAG?

IDT74FST163244PAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IDT74FST163244PAG 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 IDT74FST163244PAG?

For technical support, including IDT74FST163244PAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT74FST163244PAG requirements.

6.How does Aetrix verify that IDT74FST163244PAG is sourced from the original manufacturer or authorized distributors?

All IDT74FST163244PAG 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 IDT74FST163244PAG meets industry standards.

7.What is the process for return or replacement of IDT74FST163244PAG?

All IDT74FST163244PAG units undergo pre-shipment inspection (PSI). If there is an issue with IDT74FST163244PAG, 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 IDT74FST163244PAG part is unused and in its original packaging.

Return procedure for IDT74FST163244PAG:

1.Submit a request within 90 days.

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

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