Analog Devices Inc./Maxim Integrated MAX795TCSA

Overview

MAX795TCSA from Maxim Integrated is an 8-pin SO microprocessor supervisory circuit designed for +3.0V/+3.3V systems, providing fixed-reset threshold (3.00V–3.15V), backup-battery switchover with VBATT > VCC support, guaranteed reset assertion down to VCC = 1V, and on-board chip-enable gating with ≤7ns propagation delay. It safeguards CMOS RAM during undervoltage events in portable controllers and embedded systems.

For engineers reviewing the MAX795TCSA datasheet, MAX795TCSA pinout, MAX795TCSA application, or MAX795TCSA equivalent, key selection criteria include its T-suffix reset threshold range (3.00V–3.15V), battery-switching hysteresis (15mV typical), CE IN-to-CE OUT resistance (46Ω typ), low-line warning capability, and compatibility with 3.0V/3.3V µP power domains requiring reliable brownout protection.

Technical Context

The MAX795TCSA implements a precision voltage-monitoring comparator with fixed internal reset threshold and 10mV typical hysteresis to prevent oscillation during VCC transitions. Its integrated p-channel MOSFET switch enables seamless switchover between VCC and VBATT, with VSW threshold set at 2.55V (min) for VCC falling and 2.69V (min) for VCC rising.

It features a dedicated low-line comparator (VLR = 3.00V–3.15V − 5mV to 60mV offset) for early power-fail warning, and supports manual reset via MR input with 70µA internal pullup and 200ms timeout. Unlike MAX793/MAX794, it omits watchdog timer, BATT OK output, and RESET IN programming.

Key Specifications

Pinout & Package

MAX795TCSA is housed in an 8-pin SO (Small Outline) package with 1.27mm pitch, JEDEC MS-012AC compliant, thermal resistance θ_JA = 160°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX793TCSA and TPS3808G30DBVR, MAX795TCSA uniquely balances compact 8-pin SO packaging, integrated battery switchover, and CE gating-making it optimal for space-constrained embedded systems requiring both data retention and memory access control during power transitions.

Availability

MAX795TCSA is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and ruggedized handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX795TCSA 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, automotive, and computing applications.

The MAX795TCSA belongs to Maxim's microprocessor supervisory product line, engineered specifically for 3.0V/3.3V embedded systems needing robust power monitoring, battery backup coordination, and memory interface protection without watchdog complexity.

FAQ

What is the exact reset threshold voltage range for MAX795TCSA?

The MAX795TCSA has a fixed reset threshold range of 3.00V to 3.15V for VCC falling, as specified in the T-suffix variant. This range is optimized for 3.3V ±5% power supplies and guarantees reset assertion before VCC drops below 3.00V. The threshold exhibits 10mV typical hysteresis to prevent chatter during slow VCC transitions, and MAX795TCSA does not support external adjustment like the MAX794 series.

Does MAX795TCSA support backup-battery switchover with VBATT higher than VCC?

Yes, MAX795TCSA explicitly supports VBATT exceeding VCC - up to 6.0V absolute maximum - enabling direct connection of standard 3.6V lithium batteries without level-shifting components. The internal p-channel MOSFET switch transitions OUT from VCC to BATT when VCC falls below the battery switch threshold (2.55V min), and reverts to VCC when VCC rises above 2.69V min, with 15mV typical hysteresis to ensure clean switching.

What is the function of the CE IN and CE OUT pins on MAX795TCSA?

On MAX795TCSA, CE IN accepts the microprocessor's chip-enable signal, and CE OUT delivers a gated version that blocks memory access during undervoltage. When reset is asserted, CE OUT is forced low for 10µs to complete ongoing writes, then held inactive. The path features ≤7ns propagation delay and 46Ω series resistance, preserving timing margins for high-speed µPs. This prevents data corruption in CMOS RAM during power transients - a core function of MAX795TCSA.

Can MAX795TCSA generate an early warning before reset assertion?

Yes, MAX795TCSA provides low-line early warning via the LOWLINE comparator output (pin 14 on MAX793/MAX794, but note: MAX795TCSA does not include LOWLINE). Correction: MAX795TCSA lacks LOWLINE output. Instead, it uses PFO (Power-Fail Output) - active-low - which asserts when VCC falls below VSW (2.55V min) or when PFI input drops below 1.212V. PFO can be routed to a µP interrupt pin to initiate controlled shutdown 200ms before reset, fulfilling early-warning functionality despite absence of dedicated LOWLINE pin.

What are the thermal and electrical limits for MAX795TCSA's battery input (BATT pin)?

The BATT pin of MAX795TCSA supports −0.3V to +6.0V terminal voltage relative to GND, with continuous current limited to 50mA. Battery leakage current is ≤1µA (typical) when freshness seal is enabled, and BATT-to-OUT on-resistance is 140Ω (max) at +25°C, increasing to 160Ω at −40°C per typical characteristics. The device guarantees proper switchover behavior down to −40°C and up to +85°C ambient, with thermal resistance θ_JA = 160°C/W in 8-pin SO package.