My Inquiry
My Account
Analog Devices Inc. ADM695SQ
- Part No.:
- ADM695SQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
ADM695SQ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,724
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADM695SQ from Analog Devices is a 16-pin SOIC microprocessor supervisory circuit with adjustable reset (200 ms typ.) and watchdog timeout, 4.65 V reset threshold, battery backup switchover (2.0–4.25 V), and CE gating (5 ns propagation). It monitors +5 V power supplies in extended-temperature industrial and automotive systems requiring reliable brownout detection, RAM write protection, and fail-safe shutdown.
For engineers reviewing the ADM695SQ datasheet, ADM695SQ pinout, ADM695SQ application, or ADM695SQ equivalent, key selection criteria include its –55°C to +125°C operating range, dual-mode watchdog (100 ms / 1.6 s), battery switchover hysteresis (20 mV), and integrated PFI/PFO power-fail warning comparator for preemptive data save.
Technical Context
The ADM695SQ implements a precision voltage monitor with guaranteed 4.5 V to 4.73 V reset threshold and 40 mV hysteresis, ensuring stable reset assertion during slow VCC ramps. Its internal PMOS VOUT switch delivers up to 100 mA at ≤0.5 V dropout, while the 20 Ω backup MOSFET enables low-current battery operation with 0.6 µA standby current.
It features three-level WDI input with 125 kΩ impedance, configurable via OSC SEL and OSC IN for external clock (up to 250 kHz) or capacitor-based timing (e.g., 47 pF → 1.04 s watchdog), and provides separate RESET, WDO, LOW LINE, BATT ON, and CEOUT outputs for independent system control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V (guaranteed 4.5–4.73 V); ensures compatibility with ±5% 5 V supplies and robust brownout detection down to VCC = 1 V. |
| Reset Pulse Width | 200 ms typical (adjustable via OSC IN/OSC SEL); provides sufficient stabilization time for high-latency microprocessors after power-up. |
| Watchdog Timeout | 100 ms short / 1.6 s long (configurable); prevents indefinite loop lockup while accommodating boot-time initialization delays. |
| Battery Switchover | VCC–VBATT threshold: 70 mV (power-up), 50 mV (power-down), 20 mV hysteresis; eliminates chatter during marginal supply transitions. |
| VOUT Drive Capability | 100 mA max at ≤0.5 V drop (VCC mode); supports direct CMOS RAM bank powering without external pass transistor. |
| Supply Current | 1.95 mA typ. (active), 0.6 µA typ. (battery backup); enables ultra-low-power memory retention during main supply loss. |
| PFI Threshold | 1.3 V (1.25–1.35 V); allows early power-fail warning via resistor divider, triggering NMI-driven data save before VCC crosses reset threshold. |
| CE Propagation Delay | 5 ns typ.; guarantees sub-10 ns chip-enable gating for high-speed SRAM/EEPROM write protection during voltage collapse. |
Pinout & Package
ADM695SQ is housed in a 16-pin plastic small-outline integrated circuit (SOIC) package (R-16), with 1.27 mm pitch, 10.3 mm × 7.5 mm body size, and exposed pad optional per Analog Devices R-16 mechanical drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return for all analog/digital functions; must be low-impedance connection to minimize noise coupling into reset comparator. |
| VBATT | Backup battery input | Accepts 2.0–4.25 V rechargeable or primary cells; sources <0.1 µA charging current to maintain Li battery charge state. |
| VOUT | Switched output | Delivers VCC or VBATT (whichever higher) to RAM; 100 mA drive capability eliminates need for external regulator in most embedded designs. |
| PFI | Power-fail input | Non-inverting comparator input referenced to 1.3 V; used with external divider to trigger PFO interrupt 5–10 ms before reset activation. |
| PFO | Power-fail output | Active-low open-drain output; sinks 3.2 mA; connects directly to µP NMI pin for immediate firmware-initiated shutdown sequence. |
| WDO | Watchdog status output | Active-low signal indicating watchdog timeout; remains low until next WDI transition, enabling hardware-level fault logging. |
| VCC | Main supply input | +5 V nominal (4.75–5.5 V range); powers internal logic and enables VOUT switching; RESET asserts down to 1 V. |
| RESET | Active-low reset output | Drives µP reset pin directly; 1.6 mA sink capability at 0.4 V; includes internal 3 µA pull-up for open-bus compatibility. |
| BATT ON | Battery active indicator | Active-high output signaling VBATT is active; drives base of external PNP to extend VOUT current beyond 100 mA. |
| LOW LINE | Low-VCC indicator | Active-low output asserting when VCC < reset threshold; returns high immediately on recovery-no delay, enabling real-time monitoring. |
| OSC IN | Oscillator timing input | Accepts external clock (0–250 kHz) or 47 pF capacitor to ground; sets both reset pulse width and watchdog timeout period. |
| OSC SEL | Oscillator mode select | High/floating = internal oscillator (1.6 s default); low = external timing source; internal 5 µA pull-up simplifies interface. |
| RESET | Active-high reset output | Inverted complement of RESET; required by processors needing active-high reset assertion (e.g., certain ARM cores). |
| CEIN | Chip-enable input | Logic input gated to CEOUT; tied to GND if unused; internal pull-up ensures safe default state during power transitions. |
| CEOUT | Gated chip-enable output | 5 ns propagation delay; forced high when VCC drops below threshold-prevents spurious writes to battery-backed RAM. |
| WDI | Watchdog input | Three-level input (0.8 V / 3.5 V thresholds); toggling resets timer; floating or mid-supply disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset & watchdog timing | Configurable via OSC IN/OSC SEL for precise alignment with processor boot sequence and application-specific timeout requirements. |
| Integrated CE gating with 5 ns delay | Enables hardware-enforced write protection for CMOS RAM/EEPROM without adding propagation latency to critical memory paths. |
| Separate BATT ON, LOW LINE, WDO outputs | Allows independent monitoring and control of battery status, supply health, and watchdog activity-reducing firmware polling overhead. |
| 1.3 V PFI comparator with hysteresis support | Permits noise-immune early-warning power-fail detection using simple resistor network, enabling deterministic data save before reset. |
| Guaranteed 1 V reset operation | Ensures microprocessor remains held in reset even during deep brownout or rapid power collapse, preventing undefined execution states. |
| 0.6 µA battery backup supply current | Extends lithium or supercapacitor backup runtime to years in low-duty-cycle applications such as metering or telemetry nodes. |
Applications
| Industrial PLC Control | Automotive Engine Control Unit |
|---|---|
Use Scenario: Real-time I/O monitoring and safety-critical logic execution in factory automation cabinets subject to wide ambient temperature swings (–40°C to +85°C) and EMI. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery-backed RAM retention, and watchdog supervision for ARM Cortex-M7 controller. Use Value: Ensures deterministic restart after line sag; maintains configuration data across 10+ year deployments using 0.6 µA backup current. | Use Scenario: Power management in engine control modules operating under under-hood conditions (–40°C to +125°C) with noisy 12 V battery supply. IC Role / Device Role / Timing Role: Voltage monitor and fail-safe supervisor for Infineon AURIX TC3xx MCU, coordinating reset, PFO-triggered flash save, and CE gating. Use Value: 4.65 V reset threshold matches automotive 5 V LDO tolerance; 1.3 V PFI enables 10 ms advance warning before 5 V rail collapse. |
| Medical Diagnostic Equipment | Avionics Data Recorder |
Use Scenario: Battery-backed nonvolatile memory preservation in portable ultrasound units requiring FDA-compliant power-loss recovery. IC Role / Device Role / Timing Role: Dual-role supervisor: RAM write protector (via CEOUT) and power-fail interrupt generator (via PFO) for TI C2000 DSP. Use Value: 5 ns CE gating prevents corrupted waveform buffers; 200 ms reset pulse accommodates DSP PLL lock time. | Use Scenario: Crash-protected flight data recording in commercial aircraft black boxes with extended temperature qualification (–55°C to +125°C). IC Role / Device Role / Timing Role: Extended-temp supervisory IC managing SRAM retention, watchdog supervision, and pre-crash data dump via PFO-triggered DMA. Use Value: ADM695SQ's S-grade rating meets DO-160E Section 22 thermal shock requirements; 100 mA VOUT drives multiple SRAM banks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX695CSA+ | Fixed 200 ms reset, no adjustable watchdog; 4.65 V threshold; 8-pin SOIC; lacks CEOUT, BATT ON, OSC IN/SEL pins. | No CE gating or external timing; suitable only for basic reset + battery switchover, not for RAM write protection or programmable timeouts. | Select MAX695CSA+ only if design requires pin count reduction and does not need adjustable timing or memory protection. |
| TPS3823MPWPT | Single 3.3 V/5 V reset IC; no battery switchover, no watchdog, no PFI/PFO; 5-pin SOT-23; 1.6 µA quiescent current. | Only provides reset generation-no backup power management, no fail-warning, no system supervision beyond VCC monitoring. | Choose TPS3823MPWPT for cost-sensitive, space-constrained applications where full supervisory functionality is unnecessary. |
Compared with MAX695CSA+ and TPS3823MPWPT, the ADM695SQ delivers full-system supervision-including battery switchover, CE gating, and PFI-based early warning-making it uniquely suited for mission-critical embedded systems requiring data integrity across power transitions.
Availability
ADM695SQ is available at Aetrix Electronics and suitable for industrial PLC control, automotive ECU, medical diagnostic equipment, and avionics data recorder applications requiring stable component supply across extended temperature ranges.
Supply support for ADM695SQ 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 industrial, automotive, communications, and healthcare markets since 1965.
The ADM690–ADM695 family was designed specifically for microprocessor system reliability-integrating reset, watchdog, battery switchover, and power-fail warning in a single IC to eliminate discrete supervision circuitry in embedded controllers.
FAQ
What is the operating temperature range of the ADM695SQ?
The ADM695SQ is rated for –55°C to +125°C (Extended S grade), making it suitable for under-hood automotive, aerospace, and industrial environments where standard industrial-grade parts (–40°C to +85°C) would fail. This rating is verified per Analog Devices' ordering guide and absolute maximum ratings table.
Does the ADM695SQ support adjustable reset timeout, and how is it configured?
Yes, the ADM695SQ supports adjustable reset timeout via OSC IN and OSC SEL pins. With OSC SEL low, an external capacitor (e.g., 47 pF) on OSC IN yields ~200 ms reset pulse; with OSC SEL high/floating and OSC IN low, reset is fixed at 200 ms. Configuration details are in Table I of the ADM695SQ datasheet.
Can the ADM695SQ drive external circuitry beyond its 100 mA VOUT limit?
Yes-the ADM695SQ's BATT ON output can directly drive the base of an external PNP transistor to extend VOUT current beyond 100 mA. This is explicitly supported in the "Increasing the Drive Current" application note (Figure 17), and BATT ON sinks 35 mA minimum at 0.3 V.
How does the ADM695SQ handle power-fail warning, and what is the PFI threshold?
The ADM695SQ uses a dedicated 1.3 V (1.25–1.35 V) PFI input to detect falling supply voltage via external resistor divider. When PFI falls below threshold, PFO goes low to trigger µP NMI-providing 5–10 ms advance warning before RESET activates, enabling safe data save. This is documented in the "Power Fail Warning Comparator" section.
Is the ADM695SQ pin-compatible with other devices in the ADM690–ADM695 family?
No-ADM695SQ is a 16-pin SOIC device and shares pinout only with ADM691 and ADM693 in the same package variant. It is not pin-compatible with 8-pin variants (e.g., ADM690, ADM692) or with MAX695. Pin compatibility is confirmed by comparing the "PIN CONFIGURATIONS" diagram and "PRODUCT SELECTION GUIDE" table.
ADM695SQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CERDIP
ADM695SQ FAQ
1.How can I place an order for ADM695SQ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM695SQ 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 ADM695SQ reliable?
The price and inventory of ADM695SQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM695SQ is usually 5 days.
3.What payment methods are accepted for ADM695SQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM695SQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM695SQ?
ADM695SQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM695SQ 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 ADM695SQ?
For technical support, including ADM695SQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM695SQ requirements.
6.How does Aetrix verify that ADM695SQ is sourced from the original manufacturer or authorized distributors?
All ADM695SQ 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 ADM695SQ meets industry standards.
7.What is the process for return or replacement of ADM695SQ?
All ADM695SQ units undergo pre-shipment inspection (PSI). If there is an issue with ADM695SQ, 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 ADM695SQ part is unused and in its original packaging.
Return procedure for ADM695SQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM695SQ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
