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Analog Devices Inc./Maxim Integrated DS1259SN+
- Part No.:
- DS1259SN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
DS1259SN+.pdf
- Description:
- IC BATT PWR MGMT IND 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,222
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Product details
Overview
DS1259SN+ from Maxim Integrated (formerly Dallas Semiconductor) is a battery manager IC that autonomously switches power between primary VCCI and backup battery (VBAT) to maintain uninterrupted supply to RAM circuits. It delivers VCCO at VCCI−0.2 V (250 mA typ.) or VBAT−0.2 V (15 mA), asserts PF low when VCCI drops below 1.26×VBAT±250 mV, and consumes <100 nA battery leakage current. Used in nonvolatile memory backup systems with DS1212 controllers.
For engineers reviewing the DS1259SN+ datasheet, DS1259SN+ pinout, DS1259SN+ application, or DS1259SN+ equivalent, key selection considerations include its 16-pin SOIC package, dual-supply switchover threshold accuracy, battery fail (BF) detection at 1.5–2.6 V, reset-controlled battery isolation, and compatibility with +5 V CMOS RAM systems requiring fail-safe power management.
Technical Context
The DS1259SN+ implements an analog comparator-based switchover architecture where PF activation is triggered by VCCI falling below 1.26×VBAT ±250 mV - a fixed-ratio trip point independent of temperature or process variation. Its internal switch supports bidirectional isolation: during normal operation, VCCO is sourced from VCCI; during power loss, it seamlessly transitions to VBAT while maintaining regulated output voltage drop (−0.2 V).
Reset-controlled battery disconnection uses a 50 ns minimum high pulse on RST to force VCCO and BAT into high-impedance state until next valid VCCI application. BF signal remains high only when VBAT >2 V and VCCI is present; it goes low if battery falls below 1.5 V or during PF assertion, providing unambiguous low-battery status under active backup conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCI Supply Range | 5.0 V to 5.5 V - defines valid primary input for reliable switchover and reset timing compliance |
| VBAT Input Range | 2.5 V to 3.7 V - sets usable lithium or coin-cell battery voltage window for backup operation |
| VTP Trip Point | 1.26 × VBAT ±250 mV - determines precise switchover threshold to prevent premature or delayed backup activation |
| IBAT Leakage | <100 nA - ensures multi-year shelf life for battery-backed systems without significant self-discharge |
| VCCO Output Drop | VCCI−0.2 V / VBAT−0.2 V - guarantees minimal voltage sag during both primary and backup modes for stable RAM biasing |
| PF Response Time | 0 µs (power-down), 100 µs (power-up recovery) - enables immediate system-level power-fail interrupt signaling |
| BF Detection Threshold | 1.5 V to 2.6 V - provides hysteresis-free low-battery warning aligned with common 3 V lithium cell end-of-life |
Pinout & Package
DS1259SN+ is housed in a 16-pin SOIC (300-mil) surface-mount package with 1.27 mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBAT (Pin 2) | Battery Input | Accepts 2.5–3.7 V backup source; referenced for PF trip point calculation and BF monitoring |
| BAT (Pin 5) | Battery Output | Provides isolated battery voltage to external circuitry; remains at VBAT level regardless of VCCI state |
| RST (Pin 6) | Reset Control Input | 50 ns high pulse disables battery supply to VCCO/BAT until next VCCI power-up cycle |
| GND (Pins 7, 8) | Ground Reference | Dual ground pins reduce impedance and improve noise immunity for analog comparators and switching paths |
| VCCI (Pins 15, 16) | Primary Power Input | +5 V main supply; powers internal logic and feeds VCCO via low-drop switch during normal operation |
| VCCO (Pins 12, 13) | Uninterruptible Output | Delivers regulated power to RAM; sourced from VCCI or VBAT depending on switchover state |
| PF (Pin 11) | Power-Fail Signal | Active-low open-drain output indicating VCCI has fallen below 1.26×VBAT ±250 mV |
| BF (Pin 3) | Battery-Fail Signal | Active-low output asserting when VBAT <1.5 V (or during PF); used for battery replacement alert |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Switchover | Seamless transition between VCCI and VBAT without software intervention or external control logic |
| Reset-Controlled Battery Isolation | Prevents battery drain during shipping/storage via single-pulse RST command, eliminating need for mechanical switches |
| Low-Battery Warning (BF) | Dedicated output signals VBAT depletion before backup failure, enabling proactive maintenance in field-deployed systems |
| Integrated Power-Fail Detection (PF) | Provides TTL-compatible interrupt to microcontroller or memory controller within 0 µs of VCCI collapse |
| Ultra-Low Battery Leakage | <100 nA internal consumption extends 3 V lithium battery life beyond 10 years in standby |
Applications
| Nonvolatile RAM Backup | Industrial Data Logger |
|---|---|
Use Scenario: Maintaining SRAM contents during AC mains failure or battery swap in embedded controllers. IC Role / Device Role / Timing Role: Battery manager providing uninterrupted VCCO supply and PF interrupt to trigger data save routines. Use Value: Eliminates need for external diodes or MOSFETs; guarantees ≤0.2 V dropout and sub-100 nA battery drain for >10-year retention. | Use Scenario: Preserving sensor calibration tables and event timestamps in remote environmental monitors. IC Role / Device Role / Timing Role: Dual-role supervisor: asserts PF to halt writes before power loss, then activates BF to flag aging backup cells. Use Value: Enables predictive maintenance via BF signal; avoids silent data corruption during brownout conditions. |
| Medical Device Memory Retention | Point-of-Sale Terminal Configuration Storage |
Use Scenario: Securing patient parameter history and device settings across power cycles in portable diagnostic tools. IC Role / Device Role / Timing Role: Fail-safe power path controller ensuring RAM remains powered during battery hot-swap procedures. Use Value: RST pulse capability isolates battery during handling, preventing accidental discharge while maintaining data integrity. | Use Scenario: Storing tax rates, pricing databases, and transaction logs in retail terminals subject to frequent unplanned outages. IC Role / Device Role / Timing Role: Switchover coordinator interfacing with DS1212 Nonvolatile Controller to back up 16 RAM chips simultaneously. Use Value: Direct mating with DS1212 simplifies BOM and layout; eliminates discrete logic for multi-RAM backup sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690TSA+ | Includes watchdog timer and manual reset; higher VBAT max (4.5 V); no RST-controlled battery disconnect | Targets microcontroller supervision with reset generation, not pure RAM backup | Select when system requires integrated reset generation and watchdog, not just switchover |
| TPS3823-50DBVR | Dedicated voltage supervisor only; no battery switching or VCCO output; detects VCCI only | Used for power-good monitoring only - requires external FET/battery circuit for backup | Select when backup path is implemented externally and only VCCI monitoring is needed |
Compared with MAX690TSA+ and TPS3823-50DBVR, the DS1259SN+ uniquely integrates autonomous battery switchover, reset-controllable isolation, and dual-output signaling (PF/BF) in a single 16-pin SOIC - making it optimal for cost-sensitive, space-constrained nonvolatile RAM backup where minimal external components are required.
Availability
DS1259SN+ is available at Aetrix Electronics and suitable for nonvolatile RAM backup, industrial data loggers, medical device memory retention, and point-of-sale terminal configuration storage requiring stable component supply and long-term lifecycle support.
Supply support for DS1259SN+ 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 (acquired by Analog Devices in 2021) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The DS1259SN+ belongs to Maxim's legacy nonvolatile memory support product line, engineered specifically to simplify battery-backed RAM systems by integrating switchover control, power-fail signaling, and battery health monitoring in one chip.
FAQ
What is the primary function of the DS1259SN+?
The DS1259SN+ is a dedicated battery manager IC that automatically switches power delivery from primary VCCI to backup battery (VBAT) to maintain uninterrupted supply to RAM circuits. It provides PF and BF signals for system-level monitoring and supports reset-controlled battery isolation. The DS1259SN+ ensures data retention during power loss without external switching components.
Does the DS1259SN+ require external components to operate?
No, the DS1259SN+ operates autonomously with no external passive or active components required for basic switchover functionality. It integrates the comparator, switch, and signal drivers internally. Only VCCI, VBAT, and load connections are needed. External pull-ups may be used on PF/BF for open-drain interfacing, but are not mandatory per datasheet operation.
What is the significance of the 1.26×VBAT trip point in the DS1259SN+?
The DS1259SN+ uses a fixed 1.26×VBAT ratio to define the VCCI switchover threshold (VTP), ensuring reliable transition before VCCI drops to battery level. This ratio compensates for typical battery voltage sag under load and prevents oscillation near the crossover point. The ±250 mV tolerance accounts for process variation, guaranteeing robust operation across temperature and voltage extremes.
Can the DS1259SN+ be used with lithium-ion batteries?
No, the DS1259SN+ is specified for VBAT = 2.5–3.7 V, matching standard 3 V lithium primary cells (e.g., CR2032) or alkaline backups. Lithium-ion cells (3.0–4.2 V) exceed the 3.7 V absolute maximum and risk violating the VTP calculation range and internal comparator headroom. Using them may cause erratic switchover or damage. The DS1259SN+ is not rated for rechargeable lithium chemistries.
How does the RST pin function in the DS1259SN+?
The RST pin on the DS1259SN+ accepts a 50 ns minimum high pulse during valid VCCI to place VCCO and BAT outputs into high-impedance state - electrically disconnecting the battery. This prevents discharge during storage or shipping. When VCCI is reapplied above VBAT, the DS1259SN+ resumes normal operation automatically. No latching or external control is needed.
DS1259SN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Power Management
- Battery Chemistry:
- -
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DS1259SN+ FAQ
1.How can I place an order for DS1259SN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1259SN+ 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 DS1259SN+ reliable?
The price and inventory of DS1259SN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1259SN+ is usually 5 days.
3.What payment methods are accepted for DS1259SN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1259SN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1259SN+?
DS1259SN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1259SN+ 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 DS1259SN+?
For technical support, including DS1259SN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1259SN+ requirements.
6.How does Aetrix verify that DS1259SN+ is sourced from the original manufacturer or authorized distributors?
All DS1259SN+ 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 DS1259SN+ meets industry standards.
7.What is the process for return or replacement of DS1259SN+?
All DS1259SN+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1259SN+, 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 DS1259SN+ part is unused and in its original packaging.
Return procedure for DS1259SN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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