General Description
The ASM705 / 706 / 707 / 708 and AS813L are cost effective CMOS supervisor circuits that monitor power-supply and battery voltage level, and μP/μC operation.
The family offers several functional options. Each device generates a reset signal during power-up, power-down and during brownout conditions. A reset is generated when the supply drops below 4.65V (ASM705/707/813L) or 4.40V (ASM706/708). For 3V power supply applications, refer to the ASM705P/R/S/T data sheet. In addition, the ASM705/706/813L feature a 1.6 second watchdog timer. The ASM707/708 have both active-HIGH and active-LOW reset outputs but no watchdog function. The ASM813L has the same pin-out and functions as the ASM705 but has an active-HIGH reset output. A versatile power-fail circuit has a 1.25V threshold, useful in low battery detection and for monitoring non-5V supplies. All devices have a manual reset (MR) input. The watchdog timer output will trigger a reset if connected to MR.
All devices are available in 8-pin DIP, SO and MicroSO packages.

Features
*Precision power supply monitor
-4.65V threshold (ASM705/707/813L)
-4.40V threshold (ASM706/708)
*Debounced manual reset input
*Voltage monitor
-1.25V threshold
-Battery monitor / Auxiliary supply monitor
*Watchdog timer (ASM705/706/813L)
*200ms reset pulse width
*Active HIGH reset output (ASM707/708/813L)
*MicroSO package

Applications
*Computers and embedded controllers
*Portable/Battery-operated systems
*Intelligent instruments
*Wireless communication systems
*PDAs and hendheld equipment
*Automative Systems
*Safety Systems

ASM706, ASM707, ASM708, ASM705CPA, ASM706CPA, ASM707CPA, ASM708CPA

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Description
These devices are monolithic timing circuits capable of producing accurate time delays or oscillation. Inthe time delaymode of operation, the timed interval is controlled by a single external resistor and capacit or network. In the astable mode of operation, the frequency and duty cy cle may be independently controlled wi th two external resistors and a si ngle external capacitor.

Features
*Timing from Microseconds to Hours
*Astable or Monostable Operation
*Adjustable Duty Cycle
*TTL - Compatible Output Can Sink or Source Up to 200 mA
*Temperature Stability of 0.005% per oC
*Direct Replacement for Signetics NE555 Timer

Applications
*Precision timing
*Pulse generation
*Sequential timing
*Time delay generation
*Pulse width modulation
*Pulse position modulation
*Missing pulse detector

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General Description
The ASM706P/R/S/T/J and ASM708R/S/T/J are cost effective CMOS supervisor circuits that monitor power-supply and battery voltage level, and μP/μC operation.
The family offers several functional options. Each device generates a reset signal during power-up, power-down and during brownout conditions. A reset is generated when the supply drops below 2.63V (ASM706P/R, ASM708R), 2.93V (ASM706S, ASM708S), 3.08V (ASM706T, ASM708T) or 4.00 (ASM706J, ASM708J). In addition, the ASM706P/R/S/T/J feature a 1.6 second watchdog timer. The watchdog timer output will trigger a reset if connected to MR. Floating the WDI input pin disables the watchdog timer.
The ASM708R/S/T/J have both active-HIGH and active-LOW reset outputs but no watchdog function. The ASM706P has the same pin-out and functions as the ASM706R but has an active-
HIGH reset output.
A versatile power-fail circuit, useful in checking battery levels and non-5V supplies, has a 1.25V threshold. All devices have a manual reset input. All devices are available in 8-pin DIP, SO and the compact MicroSO packages. The MicroSO package requires 50% less PC board area than the conventional SO package.

Features
*Precision power supply minotor
-2.63V threshold (ASM706P/R, ASM708R)
-2.93V threshold (ASM706S, ASM708S)
-3.08V threshold (ASM706T, ASM708T)
-New 4.00V threshold (ASM706J , ASM708J)
*Debounced manual reset input
*Auxiliary voltage monitor comparator
-1.25V threshold
-Battery monitor / auxiliary supply monitor
*Watchdog timer (ASM706P/R/S/T/J)
-Watchdog can be disabled by floating WDI
*200ms reset time delay
*Three reset signal options
-Active HIGH: ASM706P
-Active LOW: ASM706R/S/T/J
-Active HIGH and LOW outputs: ASM708R/S/T/J
*DIP, SO and MicroSO packages
*Guaranteed RESET assertion to VCC = 1.1V

Applications
*Computers and embedded controllers
*CTI applications
*Automotive systems
*Portable/Battery-operated systems
*Intelligent instruments
*Wireless communication systems
*PDAs and hand-held equipment
*Safety systems

ASM706PCPA, ASM706PCSA, ASM706PCUA, ASM706PEPA, ASM706PESA

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General Description
The MAX6730–MAX6735 single-/dual-/triple-voltage microprocessor (μP) supervisors feature a watchdog timer and manual reset capability. The MAX6730–MAX6735 offer factory-set reset thresholds for monitoring voltages from +0.9V to +5V and an adjustable reset input for monitoring voltages down to +0.63V. The combination of these features significantly improves system reliability and accuracy when compared to separate ICs or discrete components.
The active-low reset output asserts and remains asserted for the reset timeout period after all the monitored voltages exceed their respective thresholds. Multiple factoryset reset threshold combinations reduce the number of external components required. The MAX6730/MAX6731 monitor a single fixed voltage, the MAX6732/MAX6733 monitor two fixed voltages, and the MAX6734/MAX6735 monitor two fixed voltages and one adjustable voltage. All devices are offered with six minimum reset timeout periods ranging from 1.1ms to 1120ms.
The MAX6730–MAX6735 feature a watchdog timer with an independent watchdog output. The watchdog timer prevents system lockup during code execution errors. A watchdog startup delay of 54s after reset asserts allows system initialization during power-up. The watchdog operates in normal mode with a 1.68s delay after initialization. The MAX6730/MAX6732/MAX6734 provide
an active-low, open-drain watchdog output. The MAX6731/MAX6733/MAX6735 provide an active-low, push-pull watchdog output.
Other features include a manual reset input (MAX6730/MAX6731/MAX6734/MAX6735) and push-pull reset output (MAX6731/MAX6733/MAX6735) or open-drain reset output (MAX6730/MAX6732/MAX6734). The MAX6730–MAX6733 are offered in a tiny SOT23-6 package. The MAX6734/MAX6735 are offered in a space-saving SOT23-8 package. All devices are fully specified over the extended temperature range (-40°C to +85°C).

Features
*VCC1 (Primary Supply) Reset Threshold Voltages from +1.575V to +4.63V
*VCC2 (Secondary Supply) Reset Threshold Voltages from +0.79V to +3.08V
*Adjustable RSTIN Threshold for Monitoring Voltages Down to +0.63V (MAX6734/MAX6735 Only)
*Six Reset Timeout Options
*Watchdog Timer with Independent Watchdog Output 35s (min) Initial Watchdog Startup Period 1.12s (min) Normal Watchdog Timeout Period
*Manual Reset Input (MAX6730/MAX6731/MAX6734/MAX6735)
*Guaranteed Reset Valid down to VCC1 or VCC2 = +0.8V
*Push-Pull RESET or Open-Drain RESET Output
*Immune to Short VCC Transients
*Low Supply Current: 14μA (typ) at +3.6V
*Small 6-Pin and 8-Pin SOT23 Packages

Applications
*Multivoltage Systems
*Telecom/Networking Equipment
*Computers/Servers
*Portable/Battery-Operated Equipment
*Industrial Equipment
*Printer/Fax
*Set-Top Boxes

MAX6730UTLD3-T, MAX6730UTSD3-T, MAX6730UTRD3-T

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The SG3525A, SG3527A pulse width modulator control circuits offer improved performance and lower external parts count when implemented for controlling all types of switching power supplies. The on–chip +5.1 V reference is trimmed to ±1% and the error amplifier has an input
common–mode voltage range that includes the reference voltage, thus eliminating the need for external divider resistors. A sync input to the oscillator enables multiple units to be slaved or a single unit to be synchronized to an external system clock. A wide range of deadtime can be
programmed by a single resistor connected between the CT and Discharge pins. These devices also feature built–in soft–start circuitry, requiring only an external timing capacitor. A shutdown pin controls both the soft–start circuitry and the output stages, providing instantaneous turn off through the PWM latch with pulsed shutdown, as well as soft–start recycle with longer shutdown commands. The under voltage lockout inhibits the outputs and the
changing of the soft–start capacitor when VCC is below nominal. The output stages are totem–pole design capable of sinking and sourcing in excess of 200 mA. The output stage of the SG3525A features NOR logic resulting in a low output for an off–state while the SG3527A utilized OR logic which gives a high output when off.

• 8.0 V to 35 V Operation
• 5.1 V ± 1.0% Trimmed Reference
• 100 Hz to 400 kHz Oscillator Range
• Separate Oscillator Sync Pin
• Adjustable Deadtime Control
• Input Undervoltage Lockout
• Latching PWM to Prevent Multiple Pulses
• Pulse–by–Pulse Shutdown
• Dual Source/Sink Outputs: ±400 mA Peak

SG3527A SG3525AN SG3525ADW SG3527AN

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