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Texas Instruments TPS3610U18PWR
- Part No.:
- TPS3610U18PWR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS3610U18PWR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,334
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Product details
Overview
TPS3610U18PWR from Texas Instruments is a 1.8-V precision supervisory circuit with integrated backup-battery switchover, watchdog timer (800-ms timeout), power-fail comparator, and chip-enable gating. It monitors VDD for reset assertion at 1.71 V (typ), delivers 400 mA VOUT switching capability, and supports battery-OK indication and manual switchover-designed for data-retention CMOS RAM in portable battery-powered equipment.
For engineers reviewing the TPS3610U18PWR datasheet, TPS3610U18PWR pinout, TPS3610U18PWR application, or TPS3610U18PWR equivalent, key selection criteria include its 1.71-V supply-voltage threshold, 100-nA battery-supply current, 3-ns CE propagation delay at 5 V, battery-freshness seal function, and TSSOP-14 package compatibility with space-constrained embedded systems.
Technical Context
The TPS3610U18PWR implements dual-path power management: a 1-Ω (max) PMOS switch connects VDD to VOUT during normal operation, while a 15-Ω switch engages VBAT-to-VOUT only when VDD falls below 1.71 V and VBAT exceeds VDD. Its internal 40-kΩ oscillator drives an independent watchdog timer with 800-ms timeout, retriggerable by any WDI edge.
It integrates four comparators: one for VDD reset (VIT = 1.71 V typ), one for battery status (VBOK = 1.6 V typ), one for early power-fail warning (LOWLINE ≈ VIT + 2%), and one for external PFI monitoring (V(PFI) = 1.15 V typ). All outputs are push-pull with rail-to-rail swing and specified VOL/VOH across 1.65–5.5 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Threshold | 1.71 V (typ), with ±30 mV tolerance over –40°C to 85°C - ensures reliable reset assertion before microcontroller brownout |
| Watchdog Timeout | 800 ms (typ), retriggerable on any WDI edge - prevents firmware lockup without requiring precise timing margins |
| VDD-to-VOUT rDS(on) | ≤1 Ω (max) - minimizes voltage drop and power loss during main supply operation |
| Battery Supply Current | 100 nA (max) - preserves lithium-cell shelf life for multi-year backup applications |
| CE Propagation Delay | 3 ns (at VDD = 5 V) - enables use with high-speed processors without compromising memory write integrity |
| Operating Temperature | –40°C to 85°C - qualified for industrial and automotive cabin environments |
| Package | 14-pin TSSOP (PW), 5.1 mm × 6.6 mm - surface-mount compatible with automated PCB assembly |
Pinout & Package
TPS3610U18PWR is housed in a 14-pin TSSOP (PW) package with exposed pad not electrically connected. Pin numbering follows standard top-view orientation (pin 1 at top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Power output | Switched supply rail delivered to CMOS RAM; sourced from VDD (via 1-Ω switch) or VBAT (via 15-Ω switch) |
| VDD | Main supply input | Primary system supply (1.65–5.5 V); triggers reset when falling below 1.71 V |
| GND | Ground reference | Common return path for all analog and digital functions; required for accurate threshold sensing |
| PFI | Power-fail comparator input | Monitors external voltage via resistor divider; asserts PFO low when input falls below 1.15 V |
| PFO | Power-fail comparator output | Active-low open-drain signal indicating external supply failure; requires external pullup |
| RESET | Reset output | Active-low push-pull reset signal with fixed 100-ms delay after VDD rise above threshold |
| WDI | Watchdog input | Edge-sensitive input; any transition resets 800-ms watchdog timer; unconnected = internally disabled |
| MSWITCH | Manual switchover control | Logic-high forces immediate battery-backup mode regardless of VDD level |
| BATTOK | Battery status indicator | Push-pull output indicating VBAT > 1.6 V (typ); sampled every 200 ms with 25-µs measurement window |
| BATTON | Battery switchover driver | Push-pull gate driver for external PMOS pass transistor; high when VOUT is sourced from VBAT |
| LOWLINE | Early power-fail warning | Push-pull output asserted ~2% above VIT; provides nonmaskable interrupt before RESET activation |
| CEIN | Chip-enable input | Passes through to CEOUT during normal operation; high-impedance when RESET is active |
| CEOUT | Chip-enable output | Gated CE signal to CMOS RAM; blocks writes during undervoltage conditions to prevent corruption |
| VBAT | Backup battery input | Accepts 1.5–5.5 V backup source (e.g., 3.6-V Li cell); disconnected until needed via freshness seal |
Key Features
| Feature | Design Value |
|---|---|
| Battery Freshness Seal | Internally disconnects VBAT until first power-up, preserving lithium-cell capacity for up to 10 years shelf life |
| Integrated Switchover Logic | Automatically transfers RAM supply from VDD to VBAT within microseconds when VDD drops below 1.71 V |
| Dual-Threshold Monitoring | Separate LOWLINE (VIT + 2%) and RESET (VIT) comparators enable staged shutdown sequencing |
| Low-Power CE Gating | 3-ns CEIN-to-CEOUT delay with automatic disable during reset prevents memory corruption during brownout |
| Programmable PFI Sensing | External resistor divider allows supervision of any voltage ≥1.15 V with <1% error using 1-MΩ total resistance |
Applications
| Portable Data Loggers | Fax Machines |
|---|---|
Use Scenario: Long-term environmental monitoring in remote locations with intermittent solar charging and primary Li-ion battery. IC Role / Device Role / Timing Role: Supervises main supply, triggers graceful shutdown on low-line warning (LOWLINE), asserts RESET only after critical data save, and switches RAM to sealed backup battery. Use Value: Ensures zero data loss during multi-day power outages using 100-nA battery quiescent current and freshness seal. | Use Scenario: Standby operation with frequent wake/sleep cycles and volatile RAM storing dialing history and settings. IC Role / Device Role / Timing Role: Provides 100-ms power-on reset, monitors VDD for brownout recovery, gates CE to prevent RAM corruption during line-voltage sags. Use Value: Eliminates need for external reset supervisor and discrete CE logic, reducing BOM count by 3 components. |
| Point-of-Sale Terminals | Advanced Modems |
Use Scenario: Transaction-critical devices requiring guaranteed RAM retention during AC power loss or battery swap. IC Role / Device Role / Timing Role: Uses BATTON to drive external PMOS for high-current backup switchover; asserts BATTOK to confirm battery readiness pre-transaction. Use Value: Enables hot-swap battery replacement without transaction interruption via manual switchover (MSWITCH) and seamless VBAT/VDD handoff. | Use Scenario: DSL/cable modems operating 24/7 with embedded flash and SRAM caches vulnerable to power glitches. IC Role / Device Role / Timing Role: Monitors both VDD and external DC-DC converter output (via PFI) to detect dual-rail failures; feeds WDI to recover stalled firmware. Use Value: Prevents persistent lockups by combining watchdog timeout with dual-supply fault detection, improving MTBF by >40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory and battery-switchover applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3607-18 | Single 1.8-V supply monitor only; no battery switchover, no watchdog, no CE gating | Limited to basic reset generation; cannot replace TPS3610U18PWR in RAM backup or fail-safe systems | Select only if system uses separate battery management and does not require data retention during power loss |
| MAX6361LKA18+T | 1.8-V supervisor with reset and watchdog, but no battery switchover, no BATTOK, no CE gating, SOT23-6 package | Supports simpler reset + watchdog needs but lacks integrated backup power path and RAM protection features | Choose when board space is constrained and battery backup is handled externally or not required |
Compared with TPS3610U18PWR, both alternatives omit critical functions: TPS3607-18 lacks all backup-related circuitry, while MAX6361LKA18+T omits switchover, BATTOK, and CE gating-making neither suitable for CMOS RAM data-retention designs requiring integrated power-path control.
Availability
TPS3610U18PWR is available at Aetrix Electronics and suitable for portable battery-powered equipment, point-of-sale terminals, and advanced modems requiring stable component supply, long-term lifecycle support, and guaranteed availability for industrial production programs.
Supply support for TPS3610U18PWR 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TPS3610 family was designed specifically for systems requiring nonvolatile RAM data retention during main power failure-including fax machines, set-top boxes, and portable instrumentation-integrating reset, watchdog, battery switchover, and CE protection in one 14-pin TSSOP device.
FAQ
What is the exact supply-voltage reset threshold for TPS3610U18PWR?
The TPS3610U18PWR has a nominal supply-voltage reset threshold of 1.71 V (typical), with a guaranteed range of 1.68 V to 1.74 V across –40°C to 85°C. This value is factory-trimmed and applies specifically to the U18 variant; other variants like TPS3610T50 have different thresholds (e.g., 4.55 V).
How does the battery freshness seal function in TPS3610U18PWR?
The battery freshness seal in TPS3610U18PWR disconnects VBAT from internal circuitry until first power application. It activates when VDD rises above 1.1 V while PFI is tied to VDD and PFO is grounded for 5–35 ms. The seal disables automatically on the rising edge of RESET, ensuring the backup battery remains unused until system deployment.
Can TPS3610U18PWR support a 3.6-V lithium battery while VDD is 1.8 V?
Yes, TPS3610U18PWR explicitly supports VBAT > VDD operation. Its internal architecture isolates VBAT until VDD falls below 1.71 V, then connects it to VOUT via a 15-Ω switch. The datasheet confirms compatibility with 3-V or 3.6-V lithium cells in 1.8-V systems, enabling seamless backup without external level-shifting.
What is the maximum continuous output current capability of TPS3610U18PWR's VOUT pin?
The VOUT pin of TPS3610U18PWR supports up to 400 mA continuous output current when sourced from VDD (rDS(on) ≤ 1 Ω max), and up to 7.5 mA when sourced from VBAT (rDS(on) ≤ 15 Ω max). These ratings are specified under recommended operating conditions and define safe operating limits for driving CMOS RAM and associated logic.
Does TPS3610U18PWR provide early power-fail warning before RESET assertion?
Yes, TPS3610U18PWR provides early power-fail warning via the LOWLINE output, which asserts when VDD falls to approximately VIT + 2% (i.e., ~1.74 V for the U18 variant). This occurs before RESET activation, giving the system time to execute shutdown routines-critical for preventing data corruption in battery-backed RAM applications.
TPS3610U18PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.6V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 60ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
TPS3610U18PWR FAQ
1.How can I place an order for TPS3610U18PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3610U18PWR 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 TPS3610U18PWR reliable?
The price and inventory of TPS3610U18PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3610U18PWR is usually 5 days.
3.What payment methods are accepted for TPS3610U18PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3610U18PWR transactions.
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4.How is shipping managed for TPS3610U18PWR?
TPS3610U18PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3610U18PWR 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 TPS3610U18PWR?
For technical support, including TPS3610U18PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3610U18PWR requirements.
6.How does Aetrix verify that TPS3610U18PWR is sourced from the original manufacturer or authorized distributors?
All TPS3610U18PWR 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 TPS3610U18PWR meets industry standards.
7.What is the process for return or replacement of TPS3610U18PWR?
All TPS3610U18PWR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3610U18PWR, 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 TPS3610U18PWR part is unused and in its original packaging.
Return procedure for TPS3610U18PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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