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Analog Devices Inc./Maxim Integrated MAX14778ATP+
- Part No.:
- MAX14778ATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX14778ATP+.pdf
- Description:
- IC SWITCH SP4T-NOX2 1.5OHM 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,613
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Product details
Overview
MAX14778ATP+ from Maxim Integrated is a dual ±25V above- and below-the-rails 4:1 analog multiplexer IC designed for high-voltage signal routing in mixed-protocol interfaces. It operates from a single 3.0V to 5.5V supply, delivers ≤1.5Ω on-resistance, supports ±300mA bidirectional current per channel, and enables RS-485 (20Mbps) and USB 1.1 (12Mbps) signal switching in connector-sharing systems.
For engineers reviewing the MAX14778ATP+ datasheet, MAX14778ATP+ pinout, MAX14778ATP+ application, or MAX14778ATP+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, and confirmed alternative options for multiprotocol analog multiplexing in industrial and POS systems.
Technical Context
The MAX14778ATP+ integrates three charge pumps (5V regulated, +35V, and -27V) to enable ±25V analog signal handling with only a single 3.0–5.5V supply - eliminating need for negative rails. Its break-before-make switching prevents signal shorting during channel transitions, with a guaranteed 840µs interval between disconnect and reconnect.
Each of the two independent 4:1 multiplexers features dedicated enable (ENA/ENB) and 2-bit select (SA0/SA1, SB0/SB1) inputs, allowing asynchronous control of A_ and B_ channel banks. The device maintains 3mΩ typical on-resistance flatness across the full -25V to +25V common-mode range, ensuring minimal THD+N (0.003%) and 75MHz large-signal bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0V to 5.5V single supply - eliminates need for dual-rail or negative power supplies in ±25V signal paths. |
| Analog Signal Range | ±25V - supports simultaneous RS-232, RS-485, USB 1.1, and audio signals on shared connectors without level-shifting. |
| On-Resistance (max) | 1.5Ω - ensures low insertion loss and minimal voltage drop at ±300mA continuous current per switch path. |
| On-Resistance Flatness (typ) | 3mΩ - preserves signal fidelity and linearity across full input voltage range, critical for precision analog and data transmission. |
| Large-Signal Bandwidth | 75MHz - enables clean switching of full-speed USB 1.1 (12Mbps) and RS-485 up to 20Mbps without distortion. |
| ESD Protection (A_/B_ pins) | ±6kV HBM - allows direct connection to external cables and connectors without additional protection circuitry. |
| Operating Temperature | -40°C to +125°C - qualified for industrial and automotive under-hood environments requiring extended thermal stability. |
Pinout & Package
MAX14778ATP+ is housed in a 20-pin 5mm × 5mm TQFN-EP package with exposed pad connected to VN. The package supports high-density PCB layouts and efficient thermal dissipation (θJC = 2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5 | BCOM / ACOM | Common bidirectional analog terminals for MUX B and MUX A - serve as output (multiplexer mode) or input (demultiplexer mode). |
| 6–9, 17–20 | A0–A3 / B0–B3 | Bidirectional analog I/O channels - support full ±25V signal swing and ±300mA current flow in either direction. |
| 10, 16 | ENA / ENB | Independent active-high enable inputs - disable entire MUX bank regardless of select state, enabling safe isolation. |
| 11–12, 14–15 | SA0/SA1 / SB0/SB1 | 2-bit binary channel select inputs - determine which A_ or B_ channel connects to ACOM or BCOM respectively. |
| 2, 4 | VP / VN | Charge-pump outputs - require 100nF bypass capacitors to GND to generate internal ±27V bias rails for rail-to-rail operation. |
| 3, 13 | GND / VDD | Ground reference and primary power input - VDD powers logic and charge pumps; GND serves as return for all analog and digital paths. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 MUX banks | Enables concurrent, asynchronous routing of two separate signal groups (e.g., RS-485 + USB) without cross-talk or timing dependency. |
| Break-before-make switching | Guarantees 840µs minimum dead time between channel disconnect and reconnect - prevents momentary shorts in multi-protocol connector sharing. |
| ±25V signal range on single supply | Removes need for external negative supplies or level translators when interfacing legacy RS-232, modern RS-485, and USB 1.1 on one physical port. |
| 78pF input capacitance | Minimizes loading on high-impedance sources and preserves signal integrity at high frequencies (e.g., 20MHz RS-485 edges). |
| Thermal shutdown protection | Triggers at 145°C with 25°C hysteresis - safeguards against latch-up or damage during overcurrent or high-ambient conditions. |
Applications
| RS-485/USB Connector Sharing | POS Peripheral Multiplexing |
|---|---|
|
Use Scenario: A single 9-pin D-sub connector carries both RS-485 industrial control signals and full-speed USB 1.1 host communication in a point-of-sale terminal. IC Role / Device Role / Timing Role: MAX14778ATP+ acts as a protocol-aware analog switch, isolating unused transceivers while routing active signals through shared pins with no voltage translation. Use Value: Reduces mechanical connector count by 50%, lowers BOM cost, and avoids signal integrity degradation from external level shifters or discrete switches. |
Use Scenario: A retail kiosk uses one USB port to dynamically alternate between barcode scanner, magnetic stripe reader, and customer-facing keypad. IC Role / Device Role / Timing Role: MAX14778ATP+ serves as a bidirectional analog multiplexer, enabling hot-plug-compatible switching between peripherals without host reenumeration. Use Value: Supports seamless peripheral swapping using standard USB 1.1 signaling (12Mbps), with <1.5ms enable delay and <840µs break-before-make timing. |
| Handheld Industrial Data Logger | Gaming Machine I/O Expansion |
|
Use Scenario: A battery-powered handheld instrument routes ±10V sensor outputs, RS-232 debug lines, and audio alerts through a single ruggedized micro-USB-C port. IC Role / Device Role / Timing Role: MAX14778ATP+ functions as a rail-to-rail analog switch, maintaining signal fidelity across -25V to +25V while operating from a 3.6V Li-ion supply. Use Value: Enables true single-supply operation with 1.5Ω max RON, preserving measurement accuracy and eliminating need for charge-pump ICs or external bias networks. |
Use Scenario: A casino gaming machine consolidates coin acceptor, bill validator, LED display driver, and audio amplifier signals onto a shared backplane interface. IC Role / Device Role / Timing Role: MAX14778ATP+ operates as a high-reliability analog multiplexer, supporting ±300mA continuous current and ±6kV ESD robustness for field-deployed equipment. Use Value: Delivers 125°C-rated operation and thermal shutdown protection - critical for enclosed, fanless enclosures where ambient temperatures exceed 85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel high-voltage analog multiplexing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX14777ATP+ | Single 4:1 MUX (vs. dual); identical ±25V range, 1.5Ω RON, and -40°C to +125°C rating. | Suitable only when one multiplexer bank suffices - lacks independent ENA/ENB and SA/SB control required for true dual-protocol routing. | Select MAX14777ATP+ to reduce cost and footprint where connector sharing involves only one signal domain. |
| TMUX6219RTER | Single-supply ±16.5V max (vs. ±25V); 2.1Ω RON (max); -40°C to +125°C; no integrated charge pumps - requires external bias for beyond-rail operation. | Cannot natively support RS-232 or full ±25V industrial sensors without external voltage translation or pump circuitry. | Choose TMUX6219RTER only for lower-voltage applications (<±16.5V) where board space permits external bias generation. |
Compared with MAX14777ATP+, the MAX14778ATP+ adds a second independent MUX bank and dual enable/select logic - essential for true multiprotocol connector sharing. Against TMUX6219RTER, it delivers native ±25V operation without external components, higher current capability (±300mA vs. ±250mA), and superior ESD robustness (±6kV vs. ±2kV on signal pins).
Availability
MAX14778ATP+ is available at Aetrix Electronics and suitable for industrial automation, point-of-sale peripherals, and handheld test equipment requiring stable component supply, extended temperature operation, and high-voltage analog signal routing.
Supply support for MAX14778ATP+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX14778ATP+ belongs to Maxim's high-voltage analog switch product line, engineered specifically to simplify connector consolidation in multi-standard systems such as POS terminals, industrial gateways, and portable instrumentation.
FAQ
What is the maximum continuous current supported by each channel of the MAX14778ATP+?
The MAX14778ATP+ supports ±300mA continuous current through each switch path (A0–A3 or B0–B3) in either direction. This rating applies across the full -40°C to +125°C operating range and enables robust routing of RS-485 drivers, audio amplifiers, and other moderate-power analog signals without derating.
Does the MAX14778ATP+ require external capacitors, and if so, where and why?
Yes - the MAX14778ATP+ requires two 100nF ceramic capacitors: one from VP to GND and another from VN to GND. These capacitors stabilize the internal high-voltage charge pumps that generate the ±27V bias rails needed for ±25V analog signal operation. Omitting them degrades ESD performance and may cause switching instability or increased on-resistance variation.
Can the MAX14778ATP+ operate safely when unpowered but with analog signals present?
Yes - the MAX14778ATP+ tolerates ±25V on A_, B_, ACOM, and BCOM pins even when VDD = 0V. Input leakage remains typically below 1µA in this state. However, large dv/dt on inputs can cause transient charging currents into VP/VN capacitors; limiting slew rate to ≤3V/µs after capacitor charging avoids exceeding the 300mA absolute maximum rating.
How does the break-before-make timing of the MAX14778ATP+ prevent signal corruption?
The MAX14778ATP+ guarantees a minimum 840µs break-before-make interval between channel disconnect and reconnect. This prevents momentary short circuits when switching between incompatible protocols (e.g., RS-485 differential pair and USB D+/D- lines) sharing the same physical pins - avoiding bus contention, transceiver damage, or data corruption.
Is the MAX14778ATP+ compatible with USB 1.1 full-speed data rates?
Yes - the MAX14778ATP+ supports full-speed USB 1.1 signaling at 12Mbps. Its 75MHz large-signal bandwidth, 78pF input capacitance, and low 1.5Ω on-resistance preserve signal edge integrity and minimize jitter, enabling reliable USB enumeration and data transfer without requiring external equalization or retiming.
MAX14778ATP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- SP4T - NO
- Multiplexer/Demultiplexer Circuit:
- 4:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 1.5Ohm
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- 3V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 2ms, 1.5ms
- -3db Bandwidth:
- 75MHz
- Charge Injection:
- 1720pC
- Channel Capacitance (CS(off), CD(off)):
- 78pF
- Current - Leakage (IS(off)) (Max):
- 200nA
- Crosstalk:
- -103dB @ 100kHz
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX14778ATP+ FAQ
1.How can I place an order for MAX14778ATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14778ATP+ 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 MAX14778ATP+ reliable?
The price and inventory of MAX14778ATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14778ATP+ is usually 5 days.
3.What payment methods are accepted for MAX14778ATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14778ATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14778ATP+?
MAX14778ATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14778ATP+ 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 MAX14778ATP+?
For technical support, including MAX14778ATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14778ATP+ requirements.
6.How does Aetrix verify that MAX14778ATP+ is sourced from the original manufacturer or authorized distributors?
All MAX14778ATP+ 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 MAX14778ATP+ meets industry standards.
7.What is the process for return or replacement of MAX14778ATP+?
All MAX14778ATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX14778ATP+, 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 MAX14778ATP+ part is unused and in its original packaging.
Return procedure for MAX14778ATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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