Analog Devices Inc./Maxim Integrated MAX6307UK49D4-T

Overview

MAX6307UK49D4-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 4.9V threshold), an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN) to assert a push/pull active-low RESET signal. It features 1120ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring robust power-up sequencing and brownout protection.

For engineers reviewing the MAX6307UK49D4-T datasheet, MAX6307UK49D4-T pinout, MAX6307UK49D4-T application, or MAX6307UK49D4-T equivalent, this page delivers verified specifications, exact pin functions, real-world use scenarios, and validated alternative options - all grounded in Maxim's official documentation for the precise part number.

Technical Context

The MAX6307UK49D4-T implements a triple-monitor architecture: factory-trimmed VCC sensing at 4.9V ±2.5%, plus two externally resistor-programmable comparators - one for undervoltage (RST IN) and one for overvoltage (OVRST IN) - each referenced to a 1.23V internal bandgap. Its push/pull RESET output drives logic-level loads directly without external pull-ups.

It uses a precision internal timer to enforce a fixed 1120ms (min) reset assertion period after all monitored supplies stabilize above their thresholds. Immunity to fast transients (<1µs) on all inputs is achieved via internal filtering and hysteresis (2.5mV on RST IN/OVRST IN, 2×VTH on VCC), with guaranteed operation across 0°C to +70°C.

Key Specifications

Pinout & Package

MAX6307UK49D4-T is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), optimized for space-constrained PCB layouts in portable and multivoltage systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable reset IC applications.

Compared with MAX6307UK49D4-T, MAX6307UK49D3-T offers identical supervision capability but shorter timeout for speed-critical designs, while TPS3808G33DBVR trades flexibility for ultra-low power and cost in single-rail applications - neither provides the full triple-monitor function at 4.9V with 1120ms hold.

Availability

MAX6307UK49D4-T is available at Aetrix Electronics and suitable for industrial PLCs, medical patient monitors, automotive infotainment units, networking edge routers, and multivoltage embedded controllers requiring stable component supply across extended product lifecycles.

Supply support for MAX6307UK49D4-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space- and power-constrained systems, delivering factory-programmed accuracy and triple-input flexibility without external timing components.

FAQ

What is the exact factory-programmed VCC reset threshold for MAX6307UK49D4-T?

The MAX6307UK49D4-T has a factory-trimmed VCC reset threshold of 4.900V ±2.5% at +25°C, as confirmed by Maxim's Table 1 and Electrical Characteristics section. This value is permanently set during manufacturing and requires no external calibration. The "49" in the part number directly encodes the 4.9V nominal threshold, and the device guarantees operation across 0°C to +70°C with specified tolerance.

Does MAX6307UK49D4-T support manual reset functionality?

No, MAX6307UK49D4-T does not include a manual reset (MR) input. Per the Selector Table and Pin Description, MR is present only on MAX6306/MAX6309/MAX6312 variants. The MAX6307UK49D4-T pinout consists solely of RESET, GND, OVRST IN, RST IN, and VCC - with no dedicated MR terminal. Systems requiring manual reset must implement external logic or select a different variant such as MAX6309UK49D4-T.

What are the voltage ranges supported by the RST IN and OVRST IN inputs on MAX6307UK49D4-T?

The RST IN and OVRST IN inputs on MAX6307UK49D4-T compare external voltages against a 1.23V internal reference. For RST IN (undervoltage), the monitored voltage (VIN) must fall below VTH = ((R1+R2)/R2) × 1.23V to trigger reset. For OVRST IN (overvoltage), VIN must exceed that same threshold. Input leakage is ±25nA, allowing megohm-level dividers. Both inputs operate across the full VCC range (2.5V–5.5V) and tolerate voltages from 0V to VCC − 0.3V.

Can MAX6307UK49D4-T monitor a 3.3V rail directly on its VCC pin?

No, MAX6307UK49D4-T cannot reliably monitor a 3.3V rail on its VCC pin because its factory-set threshold is 4.9V. Per the Electrical Characteristics table, VCC must be ≥ (VTH + 2.5%) = ~4.78V to ensure proper operation - below this, the internal VCC monitor is disabled. To supervise 3.3V, use the RST IN input with an external resistor divider configured to trip at 3.3V × (R2/(R1+R2)) = 1.23V.

Is the RESET output of MAX6307UK49D4-T compatible with 1.8V logic interfaces?

Yes, the push/pull RESET output of MAX6307UK49D4-T is compatible with 1.8V logic when VCC ≥ 2.5V: VOH ≥ 0.8 × VCC (so ≥1.44V at VCC = 1.8V is not applicable, but at VCC = 2.5V, VOH ≥ 2.0V) and VOL ≤ 0.3V. However, the device itself requires VCC ≥ 2.5V to operate - it cannot be powered from 1.8V. For true 1.8V-supplied systems, the RESET output meets 1.8V logic-high requirements only when VCC is ≥2.5V and the driven load is light (ISOURCE ≤ 150µA per spec).