Analog Devices Inc./Maxim Integrated MAX6897PAZT+T

Overview

MAX6897PAZT+T from Maxim Integrated is an ultra-small, low-power voltage supervisory IC with adjustable sequencing capability, featuring active-high enable input, active-high open-drain output, capacitor-adjustable delay (40µs to >1s), 0.5V precision threshold (±1.8% over temperature), and operation from 1.5V to 5.5V supply. It is used in power-supply sequencing for multi-rail systems where controlled turn-on of downstream rails is required.

For engineers reviewing the MAX6897PAZT+T datasheet, MAX6897PAZT+T pinout, MAX6897PAZT+T application, or MAX6897PAZT+T equivalent, key selection considerations include its 150ns enable-to-output propagation delay (P version), 28V-tolerant open-drain output requiring external pullup, -40°C to +125°C automotive-grade operating range, and compatibility with thin SOT23 packaging for space-constrained embedded power management.

Technical Context

The MAX6897PAZT+T implements a fixed 150ns enable-to-output propagation delay (P variant), unlike A versions with capacitor-programmable enable delay. Its high-impedance IN input monitors external voltages via resistive divider, with 0.5V rising threshold and 5mV hysteresis, enabling precise low-voltage detection down to 0.5V.

It uses a 250nA internal current source to charge an external capacitor on CDELAY pin, generating a programmable delay from IN rise to OUT assertion (tDELAY = CCDELAY × 4.0×10⁶ + 40µs). The open-drain output supports up to 28V pullup and sinks ≥90µA at VOL ≤ 0.3V (VCC ≥ 1.2V), making it suitable for level-shifting and interfacing with higher-voltage logic or MOSFET gate drivers.

Key Specifications

Pinout & Package

MAX6897PAZT+T is packaged in a thin SOT23-6 (1.60mm × 2.90mm) surface-mount package with exposed pad not electrically connected. Pinout is standardized across MAX6895–MAX6899 family in this package variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision and sequencing applications.

Compared with MAX6897AAZT+T, MAX6897PAZT+T trades delay flexibility for timing predictability and reduced component count; compared with TLV809EADBZR, it adds full sequencing control, adjustable thresholds via divider, and open-drain level-shifting - making it uniquely suited for multi-rail embedded power management.

Availability

MAX6897PAZT+T is available at Aetrix Electronics and suitable for automotive power sequencing, industrial PLC I/O modules, and medical diagnostic equipment requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6897PAZT+T 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 and mixed-signal ICs for power management, sensing, and connectivity in demanding environments.

The MAX6895–MAX6899 family was developed specifically for ultra-compact, low-power voltage supervision and sequencing in space- and power-constrained applications such as automotive infotainment, portable instrumentation, and industrial edge controllers.

FAQ

What is the function of the CDELAY pin on the MAX6897PAZT+T?

The CDELAY pin on the MAX6897PAZT+T connects to an external capacitor that sets the time delay between the IN input rising above 0.5V and the OUT signal asserting. The internal 250nA current source charges the capacitor to 1V, producing a delay calculated as tDELAY = CCDELAY × 4.0×10⁶ + 40µs. This allows precise, component-based timing without microcontroller intervention. The MAX6897PAZT+T does not use CDELAY for enable delay - that is fixed at 150ns.

Can the MAX6897PAZT+T be used with a 28V pullup on its open-drain output?

Yes, the MAX6897PAZT+T open-drain output is rated for 28V tolerance, allowing direct connection to a 28V pullup resistor. When asserted, it sinks current with VOL ≤ 0.3V at ISINK = 90µA (VCC ≥ 1.2V). For higher sink currents (e.g., 0.5mA), ensure VCC ≥ 2.25V. The pullup value must be selected to limit sink current within spec - e.g., ≥56kΩ for 28V pullup at 0.5mA. This capability makes MAX6897PAZT+T suitable for driving p-MOSFET gates or interfacing with 24V industrial control logic.

How does the MAX6897PAZT+T differ from the MAX6897AAZT+T?

The MAX6897PAZT+T uses a fixed 150ns propagation delay from ENABLE assertion to OUT assertion, while the MAX6897AAZT+T offers capacitor-adjustable enable delay. Both share identical IN threshold (0.5V), open-drain output, supply range (1.5V–5.5V), and thin SOT23-6 package. The "P" suffix denotes fixed-delay performance optimized for timing-critical, low-component-count designs; the "A" suffix supports adaptive sequencing where enable timing must scale with system conditions. MAX6897PAZT+T is not pin-compatible with MAX6897AAZT+T in terms of timing behavior, though physical layout is identical.

What is the minimum supply voltage required for guaranteed operation of the MAX6897PAZT+T?

The MAX6897PAZT+T requires VCC ≥ 1.5V for guaranteed specification compliance, including 0.5V threshold accuracy (±1.8%) and 10µA supply current. Below 1.5V, the device enters undervoltage lockout (UVLO) at ~1.2V–1.35V, causing output deassertion. Operation below 1.5V is not characterized - for reliable reset generation or sequencing, maintain VCC ≥ 1.5V. A 0.1µF ceramic bypass capacitor placed close to the VCC pin is mandatory to stabilize internal references and suppress noise-induced false triggering.

Is the MAX6897PAZT+T qualified for automotive applications?

The MAX6897PAZT+T is not explicitly AEC-Q100 qualified - only specific variants like MAX6897AAZT/V+ and MAX6897AAZT/V+T carry automotive qualification. However, MAX6897PAZT+T is fully specified over -40°C to +125°C and built on Maxim's BiCMOS process, making it suitable for many non-safety-critical automotive subsystems (e.g., infotainment, body control modules) where full AEC-Q100 certification is not mandated. For ASIL-B/C applications, consult the manufacturer's automotive-grade alternatives before final selection.