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 precision reset assertion (3.00V–3.15V threshold), backup-battery switchover with VBATT > VCC support, and chip-enable gating with ≤7ns propagation delay. It monitors critical µP power rails in portable controllers and embedded systems requiring reliable brownout protection and CMOS RAM write protection.

For engineers reviewing the MAX795TCSA+ datasheet, MAX795TCSA+ pinout, MAX795TCSA+ application, or MAX795TCSA+ equivalent, key selection criteria include guaranteed reset assertion down to VCC = 1V, battery-switch threshold hysteresis (15mV typ), low 46µA VCC supply current at +25°C, and compatibility with 3.6V lithium backup batteries.

Technical Context

The MAX795TCSA+ integrates a fixed-threshold reset comparator (3.00V–3.15V, VCC falling), a VCC-to-VBATT switchover circuit with 15mV typical hysteresis, and a bidirectional CE signal gate that disables during reset to prevent RAM corruption. Its reset timeout period is fixed at 200ms with no external timing components required.

Unlike the MAX793/MAX794, it omits watchdog timer, manual reset input (MR), battery OK output, and adjustable reset threshold - confirming its role as a streamlined, cost-optimized supervisory IC for space-constrained 8-pin applications where only core reset and backup-power management are needed.

Key Specifications

Pinout & Package

MAX795TCSA+ uses an 8-pin SO (Small Outline) package with 1.27mm pitch, JEDEC MS-012AC compliant, body size 4.9mm × 3.9mm × 1.75mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX793TCSA+, MAX795TCSA+ trades watchdog, MR, and BATT OK functionality for smaller 8-pin SO size and lower cost-ideal for space-constrained designs where only reset and battery switchover are essential. Versus TPS3808G33DBVR, it adds integrated battery switchover and CE gating but consumes more supply current.

Availability

MAX795TCSA+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart meter data loggers, 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) designs precision analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX793/MAX794/MAX795 product line delivers compact, low-power microprocessor supervisory solutions optimized for 3.0V/3.3V embedded systems requiring reliable reset, battery backup, and memory protection-without external timing or adjustment components.

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 (VCC falling), specified for use in 3.3V ±5% systems. This range ensures reset is asserted before the supply falls below 3.0V while avoiding false triggers above 3.15V. The threshold is factory-trimmed and requires no external components - a key differentiator from the adjustable MAX794.

Does MAX795TCSA+ support backup-battery switchover with VBATT > VCC?

Yes, MAX795TCSA+ fully supports backup-battery switchover where VBATT exceeds VCC - for example, using a 3.6V lithium coin cell with a 3.3V main supply. The device switches OUT from VCC to BATT when VCC falls below the battery switch threshold (2.55V–2.68V), and reconnects to VCC when VCC rises above the reset threshold or VBATT, ensuring seamless power continuity for CMOS RAM.

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

The CE IN and CE OUT pins implement chip-enable signal gating: CE IN accepts the µP's chip-select signal, and CE OUT delivers a conditioned version that is disabled during reset. This prevents spurious writes to CMOS RAM during undervoltage conditions. Propagation delay is ≤7ns, preserving timing integrity in high-speed memory interfaces - a core capability unique to the MAX795TCSA+ among 8-pin supervisors.

Can MAX795TCSA+ be used without a backup battery?

Yes, MAX795TCSA+ operates correctly with no battery connected. In that case, tie BATT to VCC and leave PFO unconnected or pulled high. The device functions as a standard reset supervisor with 200ms timeout and CE gating. All specifications - including reset assertion down to VCC = 1V and 46µA supply current - remain valid, making it suitable for cost-sensitive applications where battery backup is optional.

What package type and lead finish does MAX795TCSA+ use?

MAX795TCSA+ uses an 8-pin SO (Small Outline) package per JEDEC MS-012AC, with lead-free (Pb-free) finish indicated by the "+" suffix. The package measures 4.9mm × 3.9mm × 1.75mm, features 1.27mm pin pitch, and is qualified for reflow soldering per J-STD-020. It is rated for 0°C to +70°C operation and meets RoHS compliance requirements.