Analog Devices Inc. ADM800MAN

Overview

ADM800MAN from Analog Devices is a microprocessor supervisory circuit integrating power-on reset, battery backup switchover, watchdog timer, chip enable gating, and power-fail detection in a single 16-pin DIP package. It features a 4.4 V ±2% reset threshold, 200 ms fixed reset timeout, 1.6 s/100 ms selectable watchdog timeout, and supports VCC down to 1 V operation. It is used in industrial controllers and automotive ECUs requiring reliable brownout protection and nonvolatile memory retention.

For engineers reviewing the ADM800MAN datasheet, ADM800MAN pinout, ADM800MAN application, or ADM800MAN equivalent, this page delivers verified functional specifications, validated pin roles, confirmed battery switchover behavior, and real-world timing constraints - all specific to the ADM800M variant in N-16 DIP packaging.

Technical Context

The ADM800MAN implements a dual-threshold voltage detector (4.4 V ±2%) with 15 mV hysteresis and internal 200 ms reset timeout generator tied to an oscillator with selectable modes (internal 1.6 s/100 ms or external clock/capacitor). Its battery switchover uses PMOS (VCC→VOUT) and NMOS (VBATT→VOUT) paths with 0.8–1.2 Ω and 12–25 Ω on-resistances respectively.

Watchdog functionality relies on WDI transition detection with automatic disable during reset assertion; CE gating provides 6–10 ns propagation delay and 40–150 Ω ON-resistance; PFI comparator uses a precision 1.25 V reference with ±25 nA input bias and 25–60 µs response delay.

Key Specifications

Pinout & Package

ADM800MAN is housed in a 16-pin plastic DIP (N-16) package with 0.3-inch width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard PCB layouts and socketing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with ADM693AAN, ADM800MAN offers identical electrical behavior and footprint but reflects Analog Devices' updated product branding; versus MAX693A, it delivers lower power consumption and flexible watchdog configuration - critical for battery-backed and safety-certified systems.

Availability

ADM800MAN is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM800MAN 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 ADM800M series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for robust power monitoring and memory protection in mission-critical embedded systems operating under harsh voltage and thermal conditions.

FAQ

What is the exact reset voltage threshold tolerance for ADM800MAN?

The ADM800MAN has a guaranteed reset voltage threshold of 4.4 V with ±2% tolerance (4.312 V to 4.488 V), specified over –40°C to +85°C. This tighter tolerance than the earlier ADM693A (±3%) ensures compatibility with modern +5 V ±10% power supplies while maintaining margin against false resets during ripple or noise events. The threshold is internally trimmed and does not require external calibration.

Does ADM800MAN support external capacitor-based timing for reset and watchdog functions?

Yes, ADM800MAN supports external capacitor-based timing when OSC SEL is pulled low: connecting a capacitor from OSC IN to GND sets the reset active period to 1200 × (C/47 pF) ms and watchdog timeout to 600 × (C/47 pF) ms. For example, a 100 pF capacitor yields ~255 ms reset and ~128 ms watchdog periods. This mode requires no external clock source and is fully supported in the ADM800MAN datasheet.

Can ADM800MAN drive more than 250 mA on VOUT during battery backup?

No - ADM800MAN's internal VBATT-to-VOUT switch is rated for ≤25 mA continuous current in battery backup mode (VBATT = 2.0–4.5 V). Its 12–25 Ω on-resistance limits usable current to avoid excessive dropout. To exceed 25 mA, use the BATT ON output to drive an external PNP transistor as shown in Figure 21 of the ADM800MAN datasheet - this extends capability to >500 mA with proper heatsinking.

How does ADM800MAN behave when both VCC and VBATT are present but VCC is below the reset threshold?

When VCC is below the 4.4 V reset threshold but still > VBATT + 0.03 V, ADM800MAN switches VOUT to VBATT and asserts RESET low. BATT ON goes high, LOW LINE goes low, and CEOUT is forced high to lock RAM writes. The device draws only 0.04–1 µA from VBATT, and PFI comparator remains active as long as VCC ≥ VBATT – 1.2 V - enabling continued power-fail monitoring during switchover.

Is ADM800MAN pin-compatible with MAX693A in the same DIP package?

Yes - ADM800MAN shares identical pinout, electrical characteristics, and timing behavior with MAX693A in the 16-pin DIP package. All signals (VBATT, VOUT, RESET, WDI, etc.) map one-to-one. However, ADM800MAN offers improved ±2% reset tolerance and lower 100 µA supply current versus MAX693A's ±3% and 170 µA, making it a direct performance upgrade without layout changes.