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Analog Devices Inc./Maxim Integrated MAX14779ATP+T
- Part No.:
- MAX14779ATP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX14779ATP+T.pdf
- Description:
- QUAD SPST / DUAL SPDT BEYOND-THE
- Quantity:
- Payment:
- Shipping:
Inventory:1,540
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Product details
Overview
MAX14779ATP+T from Analog Devices is a dual SPDT beyond-the-rails analog switch enabling ±25V signal switching with a single 3.0V–5.5V supply, 2.5Ω max on-resistance at +85°C, ±200nA max on-leakage at +85°C, and 78MHz −3dB bandwidth - used in RS-485/CAN/USB transceiver selection and audio amplifier routing.
For engineers reviewing the MAX14779ATP+T datasheet, MAX14779ATP+T pinout, MAX14779ATP+T application, or MAX14779ATP+T equivalent, key selection considerations include dual SPDT topology with break-before-make timing (289–500µs), independent A/B enable control (ENA/ENB), flexible 1.62V–5.5V logic interface (VL), and TQFN-20 package compatibility with high-voltage charge-pump biasing (VP/VN).
Technical Context
The MAX14779ATP+T integrates three on-chip charge pumps (5V-regulated, VP, VN) to support ±25V analog signal handling without external high-voltage supplies. Its dual SPDT architecture uses separate ENA/ENB enables and SA/SB select inputs to independently route A1/A2 to ACOM and B1/B2 to BCOM.
Control logic requires ENA/ENB high to activate SA/SB functionality; when low, both A- and B-side switches open regardless of SA/SB state. Break-before-make timing ensures no transient shorting during SPDT transitions, critical for protecting downstream transceivers and amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±25V - supports full-range industrial bus signals (RS-485, CAN) and audio without external level-shifting. |
| On-Resistance (max) | 2.5Ω at +85°C - ensures minimal insertion loss and voltage drop under load up to ±200mA. |
| On-Leakage Current (max) | ±200nA at +85°C - preserves signal integrity in high-impedance sensor or precision instrumentation paths. |
| −3dB Bandwidth | 78MHz - sufficient for USB 2.0 data switching (480Mbps) and fast digital control signaling. |
| Break-Before-Make Time | 289–500µs - prevents momentary shorts during SPDT switching in bidirectional communication lines. |
| Logic Supply Range (VL) | 1.62V–5.5V - enables direct interfacing with 1.8V, 3.3V, or 5V microcontrollers without level translators. |
| Operating Temperature | −40°C to +125°C - qualified for automotive engine bay, industrial PLC, and outdoor telecom equipment. |
Pinout & Package
MAX14779ATP+T is housed in a 4mm × 4mm, 20-pin TQFN package with exposed pad (EP) connected to VN. Pin 1 is VP; pin 2 is GND; pin 3 is VN; pin 4 is VCC; pin 5 is I.C. (to be tied to GND); pin 13 is VL; EP connects to VN for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VP) | Positive charge-pump output | Bypass with ≥10nF/100V capacitor to GND; supplies internal high-side bias for ±25V operation. |
| 2 (GND) | Ground reference | Primary return path for VCC, VL, VP, VN, and analog/switch currents; connect EP to VN, not GND. |
| 3 (VN) | Negative charge-pump output | Bypass with ≥10nF/100V capacitor to GND; supplies internal low-side bias for ±25V operation. |
| 4 (VCC) | Main power supply input | 3.0V–5.5V single supply powering charge pumps and logic; bypass with 1µF ceramic near pin. |
| 5 (I.C.) | Internally connected node | Must be connected to GND per datasheet; not functional as user-accessible terminal. |
| 8 (B1), 9 (B2) | SPDT B-side analog terminals | B1/B2 are switched between BCOM and open; polarity-independent for ±200mA bidirectional current. |
| 11 (ENA), 12 (SA) | A-side enable & select control | ENA high enables SA control; SA = 0 routes A1→ACOM, SA = 1 routes A2→ACOM. |
| 14 (ENB), 15 (SB) | B-side enable & select control | ENB high enables SB control; SB = 0 routes B1→BCOM, SB = 1 routes B2→BCOM. |
| 17 (BCOM), 19 (ACOM) | SPDT common terminals | ACOM/BCOM serve as outputs for respective A/B switch banks; support ±25V common-mode range. |
| 13 (VL) | Logic supply input | Sets ENA/ENB/SA/SB threshold voltages (VIL = 0.3×VL, VIH = 0.7×VL); decouple with 1µF ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual SPDT with independent enable | ENA/ENB allow hardware-level isolation of A- and B-switch banks - essential for fault containment in redundant systems. |
| Beyond-the-rails signal handling | ±25V analog range exceeds supply rail (VCC ≤ 5.5V) via integrated VP/VN charge pumps - eliminates need for external high-voltage rails. |
| Break-before-make timing | 289–500µs guaranteed minimum prevents cross-conduction during SPDT transitions - protects RS-485 transceivers and audio amplifiers. |
| Flexible logic interface (VL) | 1.62V–5.5V VL input enables direct connection to 1.8V FPGAs or 5V MCUs without level shifters - reduces BOM count and layout complexity. |
| High-temp performance | Specified at −40°C to +125°C with 2.5Ω max RON and ±200nA max leakage at +85°C - suitable for under-hood automotive and industrial edge nodes. |
Applications
| RS-485/CAN Transceiver Selection | Audio Amplifier Routing |
|---|---|
Use Scenario: Dynamically selecting between two isolated RS-485 or CAN transceivers sharing one connector in a field-replaceable module. IC Role / Device Role / Timing Role: Dual SPDT switch routing differential A/B lines to either transceiver while maintaining fail-safe biasing and ESD protection. Use Value: Enables hot-swap redundancy without manual jumpering; break-before-make timing prevents bus contention during transition. |
Use Scenario: Switching stereo differential audio outputs between two amplifier stages in professional audio mixing consoles. IC Role / Device Role / Timing Role: ACOM/BCOM serve as summed outputs; A1/A2 and B1/B2 connect to amplifier pairs, enabling real-time channel assignment. Use Value: ±25V signal range handles peak audio swing without clipping; low 18mΩ RON flatness preserves channel matching and THD. |
| ATE Signal Path Multiplexing | Industrial Sensor Signal Conditioning |
Use Scenario: Routing DUT test signals (e.g., ±10V sensor excitation, thermocouple mV) through calibration paths in automated test equipment. IC Role / Device Role / Timing Role: Dual SPDT acts as programmable crosspoint - A-side selects source, B-side selects measurement instrument or load. Use Value: ±200nA max on-leakage minimizes offset error in µV-level measurements; wide temperature spec ensures repeatability across environmental chambers. |
Use Scenario: Isolating and routing multiple 4–20mA current-loop sensors to a shared ADC input in PLC backplanes. IC Role / Device Role / Timing Role: SPDT configuration routes loop power and signal return through ACOM/BCOM while maintaining galvanic separation. Use Value: ±200mA continuous current rating supports full 20mA loop drive; short-circuit protection per switch prevents cascade failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual SPDT analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX14774ATP+T | Quad SPST configuration (four independent switches), no SPDT logic; 147MHz bandwidth; ±100nA on-leakage. | Used where discrete switching of four signal paths is needed instead of dual bidirectional routing. | Select MAX14774ATP+T when independent control of four analog paths is required and SPDT functionality is unnecessary. |
| ADG5412BRUZ | Quad SPST, ±22V signal range, 10.5Ω max RON, no integrated charge pumps - requires external ±15V supplies. | Suitable for legacy systems with available dual-supply rails; lacks beyond-the-rails capability and integrated bias generation. | Choose ADG5412BRUZ only if external high-voltage supplies exist and lower bandwidth (<10MHz) is acceptable. |
Compared with MAX14774ATP+T and ADG5412BRUZ, the MAX14779ATP+T uniquely delivers dual SPDT topology with integrated ±25V bias generation in a single 3.3V/5V supply system - reducing bill-of-materials, PCB area, and design validation effort for bus and audio routing.
Availability
MAX14779ATP+T is available at Aetrix Electronics and suitable for RS-485 transceiver selection, audio amplifier routing, and ATE signal multiplexing requiring stable component supply across automotive, industrial, and test equipment lifecycles.
Supply support for MAX14779ATP+T 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The MAX14779ATP+T belongs to Analog Devices' Beyond-The-Rails analog switch product line, engineered specifically for ±25V signal routing in single-supply systems - targeting robust, high-voltage signal integrity in harsh environments.
FAQ
What is the maximum continuous current rating per switch in the MAX14779ATP+T?
The MAX14779ATP+T supports ±200mA continuous current through each switch path (A1/A2 → ACOM and B1/B2 → BCOM) over the full −40°C to +125°C operating range. This rating applies bidirectionally and is validated with thermal derating per JEDEC JESD51-7 on multilayer PCBs.
Does the MAX14779ATP+T require external high-voltage supplies to achieve ±25V signal switching?
No. The MAX14779ATP+T integrates on-chip charge pumps generating VP (+33V typ) and VN (−27V typ) from a single 3.0V–5.5V VCC supply. External 10nF/100V capacitors on VP and VN pins are mandatory, but no external ±15V or ±24V rails are needed for ±25V operation.
How does the break-before-make timing function in the MAX14779ATP+T, and is it guaranteed?
The MAX14779ATP+T guarantees break-before-make timing of 289µs (min) to 500µs (max) between A1/A2 and B1/B2 transitions. This is achieved via internal delay circuitry in the control path and is tested per Figure 5 in the datasheet - ensuring no overlap during SPDT switching that could short bus lines.
Can the MAX14779ATP+T operate with a 1.8V logic supply (VL) while using a 5V VCC?
Yes. The MAX14779ATP+T supports independent VL (1.62V–5.5V) and VCC (3.0V–5.5V) supplies. With VL = 1.8V, input thresholds become VIL = 0.54V and VIH = 1.26V - enabling direct interface to 1.8V FPGAs or ASICs while VCC powers the analog switches and charge pumps.
What is the purpose of the I.C. pin (pin 5) on the MAX14779ATP+T, and how must it be connected?
The I.C. pin (pin 5) on the MAX14779ATP+T is an internally connected node that must be externally tied to GND per the datasheet. It is not a functional I/O and has no electrical role in normal operation - leaving it floating violates the recommended layout and may impact device reliability or ESD performance.
MAX14779ATP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Beyond-the-Rails™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Circuit:
- SPDT - NO
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 2.5Ohm
- Channel-to-Channel Matching (ΔRon):
- 18mOhm
- Voltage - Supply, Single (V+):
- 3V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 600µs, 160µs
- -3db Bandwidth:
- 78MHz
- Charge Injection:
- 850pC
- Channel Capacitance (CS(off), CD(off)):
- 54pF, 54pF
- Current - Leakage (IS(off)) (Max):
- 200nA
- Crosstalk:
- -90dB @ 100kHz
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX14779ATP+T FAQ
1.How can I place an order for MAX14779ATP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14779ATP+T 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 MAX14779ATP+T reliable?
The price and inventory of MAX14779ATP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14779ATP+T is usually 5 days.
3.What payment methods are accepted for MAX14779ATP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14779ATP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14779ATP+T?
MAX14779ATP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14779ATP+T 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 MAX14779ATP+T?
For technical support, including MAX14779ATP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14779ATP+T requirements.
6.How does Aetrix verify that MAX14779ATP+T is sourced from the original manufacturer or authorized distributors?
All MAX14779ATP+T 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 MAX14779ATP+T meets industry standards.
7.What is the process for return or replacement of MAX14779ATP+T?
All MAX14779ATP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX14779ATP+T, 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 MAX14779ATP+T part is unused and in its original packaging.
Return procedure for MAX14779ATP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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