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Analog Devices Inc./Maxim Integrated DS1314S-2+
- Part No.:
- DS1314S-2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1314S-2+.pdf
- Description:
- IC CTRLR NV W/BATT MON 3V 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,873
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Product details
Overview
DS1314S-2+ from Maxim Integrated is a nonvolatile SRAM controller with integrated lithium battery monitoring and power-fail detection. It converts standard CMOS SRAM into nonvolatile memory by switching to battery backup when VCCI drops below 2.8–3.0V (TOL=GND), provides open-drain Battery Warning (BW) and Reset (RST) outputs, and operates across -40°C to +85°C in an 8-pin SOIC package.
For engineers reviewing the DS1314S-2+ datasheet, DS1314S-2+ pinout, DS1314S-2+ application, or DS1314S-2+ equivalent, this page delivers verified functional roles, real-world timing behavior (tREC = 12–125 ms, tRPU = 150–350 ms), battery test interval (24 hr), and precise voltage thresholds (VCCTP, VBTP, VSW) critical for reliable memory retention and early battery replacement planning.
Technical Context
The DS1314S-2+ implements dual-voltage monitoring: one comparator detects VCCI out-of-tolerance to trigger write protection via CEO inhibition and battery switchover, while a second circuit performs periodic loaded-battery voltage testing using a 1.2 MΩ internal resistor and factory-trimmed 2.5–2.7V trip point (VBTP). Its 8-pin SOIC variant lacks RST but retains all core memory backup and battery warning functions.
Power management logic enforces strict sequencing: CEO remains low up to 1.5 µs after power failure detection if CEI is active, ensuring in-progress memory writes complete; VCCO is regulated to VBAT − 0.2V during backup; and Freshness Seal Mode prevents battery drain until first system power-up and subsequent VCCI dropout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point (TOL=GND) | 2.8–3.0V - defines precise power-fail detection threshold for 3.3V systems |
| Battery Voltage Trip Point (VBTP) | 2.5–2.7V - factory-trimmed threshold for loaded-battery test triggering BW assertion |
| VCC/VBAT Switch Point (TOL=GND) | 2.6–2.8V - determines when battery takes over SRAM supply to maintain data integrity |
| CEO Propagation Delay | 12–20 ns - ensures rapid write-protection activation during power collapse |
| VCC Valid to RST Inactive (tRPU) | 150–350 ms - guarantees stable power-on reset duration for processor initialization |
| Battery Test Interval | 24 hours - balances battery life preservation with reliable end-of-life warning |
| Operating Current (CMOS inputs) | 30–100 µA - enables ultra-low-quiescent operation during long-term backup mode |
Pinout & Package
DS1314S-2+ is housed in an 8-pin SOIC package (150 mil width), RoHS-compliant, with thermal resistance θJA = 132°C/W. Pin assignments are validated per Maxim's official datasheet revision 6/12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return path for all internal analog comparators and digital logic |
| TOL | VCC tolerance select | Configures VCCTP to 2.8–3.0V (GND) or 2.5–2.7V (VCCO) for 3.3V or 3.0V systems |
| VBAT | Lithium battery input | Accepts 2.0–6.0V backup source; powers SRAM via internal low-drop switch (<0.2V loss) |
| VCCO | SRAM power output | Delivers regulated VCCI or VBAT-derived voltage to attached SRAM; supports ≤140 mA load |
| VCCI | System supply input | Monitored primary power rail; triggers write protection and battery switchover on dropout |
| BW | Battery warning output | Open-drain signal asserted when loaded VBAT < VBTP; requires external pull-up |
| CEO | Chip enable output | Open-drain output inhibiting SRAM writes during power failure; held ≤0.2V above VCCO when active |
| CEI | Chip enable input | Controls CEO timing: delays write protection up to 1.5 µs if CEI remains low post-failure |
Key Features
| Feature | Design Value |
|---|---|
| Unconditional write protection | CEO forced low within nanoseconds of VCCI dropout, preventing corruption of SRAM writes in progress |
| Factory-calibrated battery monitoring | 24-hour periodic loaded test with 1.2 MΩ internal resistor ensures accurate end-of-life prediction without continuous drain |
| Freshness Seal Mode | Prevents battery discharge during storage by delaying backup activation until first VCCI dropout after power-up |
| Low-leakage CMOS process | 30–100 µA operating current extends lithium cell life beyond 10 years in typical backup applications |
| Configurable trip points | TOL pin selection allows single design to support both 3.3V (2.8–3.0V trip) and 3.0V (2.5–2.7V trip) system supplies |
Applications
| Industrial Data Logger | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Long-term environmental sensor data collection in remote, unattended installations powered intermittently. IC Role / Device Role / Timing Role: Nonvolatile controller preserving SRAM contents during grid outages or battery swaps. Use Value: Prevents loss of critical time-series measurements by enabling seamless battery switchover and issuing 24-hour-advanced BW alert before lithium depletion. | Use Scenario: Portable ultrasound or ECG units requiring persistent waveform buffer storage between clinical sessions. IC Role / Device Role / Timing Role: Memory backup supervisor managing VCCO delivery and asserting BW to prompt scheduled battery replacement during maintenance windows. Use Value: Ensures patient data integrity across power cycles and eliminates unexpected shutdowns via precise 2.5–2.7V loaded-battery trip detection. |
| Point-of-Sale Terminal | Energy Metering System |
Use Scenario: Retail terminals experiencing frequent AC power interruptions during daily operations. IC Role / Device Role / Timing Role: Real-time SRAM protector that inhibits writes during brownouts and maintains RAM voltage via lithium backup. Use Value: Guarantees transaction log continuity with sub-µs CEO response and 1.5 µs CEI-controlled write-protection delay for in-flight writes. | Use Scenario: Smart electricity meters deployed in utility substations with infrequent maintenance access. IC Role / Device Role / Timing Role: Long-life battery monitor enforcing 24-hour test cycles only during nominal VCCI periods to maximize cell longevity. Use Value: Delivers >10-year field reliability by minimizing battery self-discharge while providing deterministic end-of-life signaling before data loss risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1315S-2+ | Includes integrated watchdog timer and enhanced reset timing (tRPU = 200–600 ms); same pinout and battery monitoring | Required where system-level fault recovery beyond power-on reset is needed | Select DS1315S-2+ only if watchdog functionality is mandatory; otherwise DS1314S-2+ offers lower cost and identical memory backup behavior |
| MAX6900AESA+ | Provides battery-backed SRAM control plus real-time clock (RTC); different pinout (16-pin SOIC), no TOL configuration | Suitable when time-stamped logging or calendar-based events are required alongside memory retention | Choose MAX6900AESA+ only when RTC integration justifies redesign; DS1314S-2+ remains optimal for pure memory backup with minimal footprint |
Compared with DS1315S-2+, DS1314S-2+ omits watchdog logic but matches its core voltage monitoring, battery test interval, and CEO timing-making it ideal for cost-sensitive, reset-only applications. Against MAX6900AESA+, DS1314S-2+ trades RTC capability for smaller 8-pin SOIC size and direct TOL-configurable trip points, simplifying layout and reducing BOM count.
Availability
DS1314S-2+ is available at Aetrix Electronics and suitable for industrial data loggers, medical diagnostic equipment, point-of-sale terminals, and energy metering systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for DS1314S-2+ 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, medical, and communications applications.
The DS1314 product line delivers nonvolatile memory controllers with integrated battery monitoring and power-fail detection, targeting systems where SRAM data persistence and predictive battery maintenance are mission-critical.
FAQ
What is the primary function of the DS1314S-2+?
The DS1314S-2+ is a nonvolatile SRAM controller that converts standard CMOS SRAM into nonvolatile memory by automatically switching to lithium battery backup when system VCCI drops below its configured trip point (2.8–3.0V with TOL=GND). It also monitors battery health via periodic loaded-voltage tests and asserts the open-drain BW signal when capacity nears depletion. The DS1314S-2+ ensures data integrity through precise CEO timing, Freshness Seal Mode, and sub-0.2V switch losses-critical for applications like industrial loggers and medical devices relying on DS1314S-2+ for uninterrupted memory retention.
How does the DS1314S-2+ detect impending battery failure?
The DS1314S-2+ performs a loaded-battery voltage test every 24 hours: it connects VBAT to a 1.2 MΩ internal resistor for 1 second and compares the resulting voltage against a factory-trimmed 2.5–2.7V trip point (VBTP). If VBAT falls below VBTP under load, the open-drain BW output is asserted to signal imminent end-of-life. BW remains active until the battery is physically replaced-ensuring DS1314S-2+ provides deterministic, low-power battery monitoring without continuous drain. This mechanism is documented in the DS1314S-2+ datasheet section "BATTERY VOLTAGE MONITORING".
What is the role of the TOL pin on the DS1314S-2+?
The TOL pin on the DS1314S-2+ selects the VCCI trip point (VCCTP) for power-fail detection: tying TOL to GND configures VCCTP to 2.8–3.0V for use with 3.3V systems, while connecting TOL to VCCO sets VCCTP to 2.5–2.7V for 3.0V supplies. This single-pin configuration allows one DS1314S-2+ design to support multiple system voltages without hardware changes. The DS1314S-2+ datasheet specifies that TOL directly controls both VCCTP and the VCC/VBAT switch point (VSW), making it central to DS1314S-2+ adaptability across industrial and medical platforms.
Does the DS1314S-2+ provide a reset output?
No, the DS1314S-2+ does not include a reset output. Unlike the DS1314E (20-pin TSSOP) or DS1314S (16-pin SOIC) variants, the DS1314S-2+ is the 8-pin SOIC version that omits the RST pin entirely-retaining only GND, TOL, VBAT, VCCO, VCCI, BW, CEO, and CEI. Its function is strictly focused on SRAM write protection and battery monitoring. Engineers requiring power-on or power-fail reset must select DS1314E+ or DS1314S+, not DS1314S-2+. This distinction is explicitly stated in the DS1314S-2+ ordering information and pin diagrams.
What is Freshness Seal Mode in the DS1314S-2+?
Freshness Seal Mode prevents battery discharge during manufacturing and shipping: when VCCI is absent, the DS1314S-2+ blocks battery power from reaching VCCO-even if a lithium cell is installed. Only after VCCI first rises above VCCTP and later drops below both VSW and VBAT does the DS1314S-2+ exit this mode and enable backup. This ensures zero battery drain prior to system deployment. The DS1314S-2+ datasheet confirms this behavior is inherent to all DS1314 variants, including DS1314S-2+, and is essential for achieving >10-year shelf life in field-deployed equipment.
DS1314S-2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Controller Type:
- Nonvolatile RAM
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
DS1314S-2+ FAQ
1.How can I place an order for DS1314S-2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1314S-2+ 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 DS1314S-2+ reliable?
The price and inventory of DS1314S-2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1314S-2+ is usually 5 days.
3.What payment methods are accepted for DS1314S-2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1314S-2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1314S-2+?
DS1314S-2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1314S-2+ 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 DS1314S-2+?
For technical support, including DS1314S-2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1314S-2+ requirements.
6.How does Aetrix verify that DS1314S-2+ is sourced from the original manufacturer or authorized distributors?
All DS1314S-2+ 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 DS1314S-2+ meets industry standards.
7.What is the process for return or replacement of DS1314S-2+?
All DS1314S-2+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1314S-2+, 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 DS1314S-2+ part is unused and in its original packaging.
Return procedure for DS1314S-2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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