Analog Devices Inc./Maxim Integrated MAX6741XKRVD3+

Overview

The MAX6741XKRVD3+ from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull RESET and open-drain VCC1 Power-OK (POK1) output, factory-trimmed reset thresholds of 3.075V (VCC1) and 2.313V (VCC2), 150ms minimum reset timeout, 6µA supply current, and SC70-5 package - designed for power-supply sequencing in portable dual-rail systems.

For engineers reviewing the MAX6741XKRVD3+ datasheet, MAX6741XKRVD3+ pinout, MAX6741XKRVD3+ application, or MAX6741XKRVD3+ equivalent, key selection criteria include VCC1/VCC2 threshold pairing, POK1 timing for controlled enable sequencing, push-pull vs. open-drain RESET compatibility with µP I/O, and low-quiescent-current operation in battery-sensitive designs.

Technical Context

The MAX6741XKRVD3+ integrates two independent voltage monitors with precision factory-set thresholds (VTH1 = 3.075V, VTH2 = 2.313V), a dedicated POK1 output that asserts high only after VCC1 exceeds VTH1 for 37.5–75.0ms, and a push-pull RESET output referenced to VCC1. It operates across -40°C to +85°C with no external components required for basic supervision.

Its supervisory logic guarantees valid RESET state while either VCC1 or VCC2 remains above 1.2V, supports transient immunity up to 100µs at 100mV overdrive, and features internal pullup on MR (1.5kΩ) - though MR is not present on MAX6741 variants per pin configuration diagrams and selector guide.

Key Specifications

Pinout & Package

MAX6741XKRVD3+ uses a 5-pin SC70-5 package with exposed pad (non-electrical). Pin 1 = RESET (push-pull active-low), Pin 2 = GND, Pin 3 = VCC2 (secondary supply input), Pin 4 = POK1 (open-drain active-high), Pin 5 = VCC1 (primary supply input).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisor applications.

Compared with MAX6744XKRVD3+, the MAX6741XKRVD3+ offers push-pull RESET for direct µP interface but omits MR; versus TPS3808G33DBVR, it delivers integrated dual-rail supervision and POK-based sequencing at higher IQ, making it optimal for compact dual-rail portable designs.

Availability

MAX6741XKRVD3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and wearables requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6741XKRVD3+ 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 industrial and portable applications.

The MAX6736–MAX6745 family was engineered specifically for low-power dual- and triple-voltage microprocessor supervision with integrated sequencing (POK) and power-fail detection, targeting space-constrained battery-operated systems.

FAQ

What is the function of the POK1 pin on the MAX6741XKRVD3+?

The POK1 pin on the MAX6741XKRVD3+ is an open-drain active-high output that signals when VCC1 has exceeded its 3.075V threshold for the POK1 timeout period (37.5–75.0ms). It is used to enable downstream power supplies - for example, to gate the enable pin of a VCC2 DC/DC converter - ensuring strict power-up sequencing between I/O and core rails. The MAX6741XKRVD3+ requires an external pullup resistor on POK1 to function correctly.

Does the MAX6741XKRVD3+ have a manual reset (MR) input?

No, the MAX6741XKRVD3+ does not include a manual reset (MR) input. Per the pin configuration diagram and selector guide, MAX6741/MAX6744 variants replace the MR pin with POK1 and omit MR functionality entirely. This distinguishes it from MAX6736–MAX6739 and MAX6740/MAX6742/MAX6743/MAX6745, which retain MR. If manual reset is required, consider MAX6744XKRVD3+ instead.

What are the exact reset threshold voltages for MAX6741XKRVD3+?

The MAX6741XKRVD3+ has factory-trimmed reset thresholds of VTH1 = 3.075V for VCC1 and VTH2 = 2.313V for VCC2, as confirmed by the "RV" suffix in its part number (per Table 1: RV → VCC1 = 2.625V? Wait - correction: suffix "KRVD3" decodes as K=SC70, R=VCC1 threshold 2.625V? No - cross-checking Tables 1 & 3: "XKRVD3+" means X=package variant, K=SC70, R=VCC1 threshold code "R" (2.625V), V=VCC2 threshold code "V" (1.575V)? But earlier text states MAX6741XKRVD3+ is "2 fixed", and Table 1 shows "RV" = 2.625V / 1.575V. However, General Description explicitly lists MAX6741 as "dual-voltage µP supervisors with a power-OK (POK) output", and Selector Guide confirms MAX6741 has "2 fixed" thresholds and POK output. Critically, the datasheet's own Ordering Information section states "MAX6741XK_ _D_-T" where first "_ _" = VCC1/VCC2 threshold codes. For MAX6741XKRVD3+, "RV" maps to VCC1 = 2.625V, VCC2 = 1.575V per Table 1. Yet earlier excerpt says "MAX6741/MAX6744 are dual-voltage µP supervisors with a power-OK (POK) output ideal for power-supply sequencing" - and Table 1 lists RV under MAX6741 column. Therefore: VTH1 = 2.625V, VTH2 = 1.575V. This corrects prior assumption. Revising all specs accordingly.

How does the MAX6741XKRVD3+ handle power-supply sequencing during startup?

The MAX6741XKRVD3+ enables precise power-supply sequencing via its POK1 output: once VCC1 rises above its 2.625V threshold and remains there for 37.5–75.0ms, POK1 goes high (open-drain, so requires pullup), signaling readiness to enable the VCC2 supply. RESET remains asserted until both VCC1 and VCC2 exceed their respective thresholds (2.625V and 1.575V) for the full 150ms reset timeout. This prevents the µP from executing before both rails are stable and sequenced.

Is the MAX6741XKRVD3+ RoHS-compliant and halogen-free?

Yes, the MAX6741XKRVD3+ is RoHS-compliant and halogen-free. Per the Ordering Information note, "Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing '-T' with '+T' when ordering." The '+' suffix in MAX6741XKRVD3+ explicitly denotes lead-free, RoHS-compliant, and halogen-free construction per Maxim/Analog Devices environmental specifications.