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Renesas 74FST6800PGG
- Part No.:
- 74FST6800PGG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74FST6800PGG.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,095
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Product details
Overview
74FST6800PGG from Renesas Electronics (formerly IDT) is a 10-bit TTL-compatible bus switch with precharged outputs, designed for high-speed signal routing in industrial systems. It features 7 Ω on-resistance, 0.25 ns max propagation delay, and hot-insertion capability with VCC = 0 V operation. Used in backplane interconnects and hot-swap I/O expansion modules.
For engineers reviewing the 74FST6800PGG datasheet, 74FST6800PGG pinout, 74FST6800PGG application, or 74FST6800PGG equivalent, key selection criteria include precharge-enabled output isolation, industrial temperature support (–40°C to +85°C), QSOP-24 package compatibility, and absence of internal current sourcing/sinking.
Technical Context
The 74FST6800PGG implements ten independent n-channel FET switches, each connecting An to Bn when enabled. Its gate control logic ensures zero static power draw in quiescent state (ICC ≤ 3 μA) and supports TTL-level inputs (VIL ≤ 0.8 V, VVIH ≥ 2 V).
When ON = LOW, A–B paths conduct with RON = 7 Ω typical at VCC = 4.75 V; when ON = HIGH, B outputs are actively precharged to BIASV via ~10 kΩ equivalent resistance. No internal level-shifting or buffering is provided - it functions purely as a passive, low-noise signal path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Count | 10 independent bidirectional channels |
| On-Resistance (RON) | 7 Ω max - enables <100 ps RC delay with 50 pF load |
| Propagation Delay | 0.25 ns max - negligible system timing impact |
| Supply Voltage Range | 5.0 V ±5% - compatible with standard TTL/CMOS logic rails |
| Operating Temperature | –40°C to +85°C - certified for industrial environments |
| ESD Rating | >2000 V HBM - robust handling during board assembly |
| Precharge Current | 0.15 mA min at BIASV = 2.4 V - ensures fast, stable output biasing |
Pinout & Package
74FST6800PGG is packaged in a 24-pin QSOP (Quarter-size Small Outline Package – Green), 0.150″ body width, 0.635 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A10 | Input/Output Port A | 10 bidirectional signal terminals connected directly to FET sources |
| B1–B10 | Input/Output Port B | 10 bidirectional signal terminals connected directly to FET drains |
| ON | Active-Low Enable | LOW enables A↔B conduction; HIGH disables and precharges B outputs |
| BIASV | Precharge Reference | External voltage source (0 to VCC) setting precharge level for B outputs |
| VCC | Power Supply | 5 V supply for internal gate drive; required for switching but not for hot-insertion |
| GND | Ground Reference | Common return for all signals and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Zero-delay signal path | RC-limited propagation (≤0.25 ns) eliminates timing budget overhead in high-speed buses |
| Hot-insertion support | Functional isolation with VCC = 0 V prevents backdrive damage during live card insertion |
| TTL-compatible I/O | Direct interface with legacy 5 V logic without level translators or pull-ups |
| Precharged outputs | Eliminates floating-bus states during disable, reducing EMI and latch-up risk |
| Low quiescent current | ICC ≤ 3 μA - suitable for always-on monitoring subsystems with strict power budgets |
Applications
| Backplane Signal Routing | Hot-Swap I/O Expansion |
|---|---|
Use Scenario: Isolating redundant data paths in modular telecom chassis where multiple line cards share a common backplane bus. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling/disabling signal coupling between active and standby modules. Use Value: Prevents signal contention during failover; precharged B outputs avoid glitches on shared lines during reconfiguration. | Use Scenario: Adding peripheral interfaces (e.g., RS-232, CAN) to an embedded controller via pluggable daughterboards. IC Role / Device Role / Timing Role: Signal isolation gate that powers up only after host initialization completes. Use Value: Hot-insertion capability allows safe insertion while main system remains powered; no sequencing required. |
| Legacy System Bus Bridging | Industrial PLC I/O Multiplexing |
Use Scenario: Interfacing newer microcontrollers with older 5 V parallel peripherals (e.g., EPROMs, LCD controllers) using shared address/data buses. IC Role / Device Role / Timing Role: Level-consistent bus switch eliminating need for discrete transceivers or resistive networks. Use Value: Maintains TTL voltage thresholds across both sides; 7 Ω RON preserves signal integrity up to 100 MHz. | Use Scenario: Dynamically assigning sensor inputs (e.g., thermocouples, RTDs) to limited ADC channels in programmable logic controllers. IC Role / Device Role / Timing Role: Low-noise analog signal path selector with minimal added capacitance (CI/O ≤ 5 pF). Use Value: Precharged outputs prevent transient injection into sensitive analog front-ends during channel switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16210DGGR | 16-bit, 5-V only, no precharge; RON = 5 Ω typical | Lacks BIASV-controlled precharge; requires external pull-up/down for idle state control | Preferred when higher channel count and lower RON outweigh need for precharge stability |
| 74LVC1G66GW,125 | Single-channel, 1.65–5.5 V supply, no precharge, RON = 10 Ω typical | Scalable per-channel enable; unsuitable for 10-bit synchronized switching | Used for discrete signal gating where voltage flexibility matters more than multi-bit coordination |
Compared with SN74CBT16210DGGR and 74LVC1G66GW,125, the 74FST6800PGG uniquely delivers coordinated 10-bit precharged isolation in a single industrial-grade package - critical for glitch-free bus arbitration and hot-swap reliability where output state predictability is mandatory.
Availability
74FST6800PGG is available at Aetrix Electronics and suitable for backplane interconnects, hot-swap I/O expansion, and legacy bus bridging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74FST6800PGG 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT applications.
The 74FST6800PGG belongs to Renesas' legacy IDT logic portfolio, engineered specifically for noise-sensitive, high-reliability industrial signal routing where deterministic output behavior and hot-plug safety are non-negotiable.
FAQ
What is the function of the BIASV pin on the 74FST6800PGG?
The BIASV pin on the 74FST6800PGG sets the precharge voltage level for the B-side outputs when the device is disabled (ON = HIGH). It accepts any voltage from 0 to VCC, and internally biases B1–B10 through ~10 kΩ equivalent resistance. This prevents floating outputs and reduces EMI during inactive states - a key feature distinguishing the 74FST6800PGG from standard bus switches.
Does the 74FST6800PGG support hot insertion, and how is this achieved?
Yes, the 74FST6800PGG supports hot insertion because its n-channel FET architecture allows full functional isolation when VCC = 0 V. With no supply applied, all switches remain off and exhibit <1 μA off-state leakage (IOFF), preventing backdrive into live systems. This behavior is explicitly guaranteed in the datasheet and makes the 74FST6800PGG suitable for modular industrial equipment requiring live card replacement.
What is the maximum continuous current per channel for the 74FST6800PGG?
The 74FST6800PGG supports a maximum continuous channel current of 128 mA per switch, as specified in its Absolute Maximum Ratings table. This rating applies under steady-state conditions with proper thermal management and ensures reliable operation in high-drive applications such as driving terminated transmission lines or capacitive loads up to 50 pF without derating.
Can the 74FST6800PGG be used with 3.3 V logic systems?
No - the 74FST6800PGG is strictly a 5 V-only device, specified for VCC = 5.0 V ±5%. Its TTL-compatible inputs require VIH ≥ 2 V and VIL ≤ 0.8 V, and its RON and timing parameters are characterized only at 5 V. Using it with 3.3 V logic risks undefined switching behavior and violates the Absolute Maximum Ratings; for mixed-voltage systems, consider level-shifting or alternative families like 74LVC.
How does the 74FST6800PGG differ from standard analog switches like the DG403?
The 74FST6800PGG differs fundamentally from analog switches like the DG403: it lacks internal charge pumps or level shifters, offers no guaranteed off-isolation (>60 dB), and provides no rail-to-rail analog performance. Instead, it delivers ultra-low RON (7 Ω), sub-nanosecond propagation, and TTL-compatible digital control - optimized for high-speed digital bus isolation, not precision analog signal routing. The 74FST6800PGG is a logic-domain bus switch, not an analog switch.
74FST6800PGG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FST
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 10 x 1:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74FST6800PGG FAQ
1.How can I place an order for 74FST6800PGG through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FST6800PGG 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 74FST6800PGG reliable?
The price and inventory of 74FST6800PGG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FST6800PGG is usually 5 days.
3.What payment methods are accepted for 74FST6800PGG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FST6800PGG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FST6800PGG?
74FST6800PGG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FST6800PGG 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 74FST6800PGG?
For technical support, including 74FST6800PGG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FST6800PGG requirements.
6.How does Aetrix verify that 74FST6800PGG is sourced from the original manufacturer or authorized distributors?
All 74FST6800PGG 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 74FST6800PGG meets industry standards.
7.What is the process for return or replacement of 74FST6800PGG?
All 74FST6800PGG units undergo pre-shipment inspection (PSI). If there is an issue with 74FST6800PGG, 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 74FST6800PGG part is unused and in its original packaging.
Return procedure for 74FST6800PGG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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