DS1236AS-10+ datasheet, PDF - EEWORLD Datasheet

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DS1236AS-10+: DescriptionSupervisory Circuits; CategoryPower/power management The power supply circuit; File Size428KB，20 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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DS1236AS-10+ Overview

Supervisory Circuits

DS1236AS-10+ Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	Maxim
Parts packaging code	SOIC
package instruction	0.300 INCH, SOIC-16
Contacts	16
Reach Compliance Code	unknown
ECCN code	EAR99
Other features	PUSHBUTTON RESET INPUT
Adjustable threshold	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY MANAGEMENT CIRCUIT
JESD-30 code	R-PDSO-G16
JESD-609 code	e3
length	10.3 mm
Number of channels	2
Number of functions	1
Number of terminals	16
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP16,.4
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260
power supply	5 V
Certification status	Not Qualified
Maximum seat height	2.68 mm
Maximum supply current (Isup)	4 mA
Nominal supply voltage (Vsup)	5 V
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	7.5 mm

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DS1236A

MicroManager Chip

www.maxim-ic.com

FEATURES

Holds microprocessor in check during power

transients

Halts and restarts an out-of-control

microprocessor

Monitors pushbutton for external override

Warns microprocessor of an impending power

failure

Converts CMOS SRAM into nonvolatile

memory

Unconditionally write protects memory when

power supply is out of tolerance

Consumes less than 100 nA of battery current

at 25°C

Controls external power switch for high

current applications

Accurate 10% power supply monitoring

Optional 5% power supply monitoring

designated DS1236A-5

Provides orderly shutdown in nonvolatile

microprocessor applications

Supplies necessary control for low-power

“stop mode” in battery operated hand-held

applications

Standard 16-pin DIP or space-saving 16-pin

SOIC

Optional industrial temperature range -40°C

to +85°C

PIN ASSIGNMENT

VBAT

VCCO

VCC

GND

WC/SC

RST

PBRST

CEI

CEO

NMI

VBAT

VCCO

VCC

GND

WC/SC

RST

PBRST

CEI

CEO

NMI

16-Pin DIP (300-mil)

See Mech. Drawings Section

16-Pin SOIC (300-mil)

See Mech. Drawings Section

PIN DESCRIPTION

BAT

CCO

GND

WC/

NMI

CEO

CEI

PBRST

RST

- +3-Volt Battery Input

- Switched SRAM Supply Output

- +5-Volt Power Supply Input

- Ground

- Power-Fail (Active High)

- Power-Fail (Active Low)

- Wake-Up Control (Sleep)

- Reset Control

- Early Warning Input

- Non-Maskable Interrupt

- Strobe Input

- Chip Enable Output

- Chip Enable Input

- Pushbutton Reset Input

- Reset Output (Active Low)

- Reset Output (Active High)

DESCRIPTION

The DS1236A MicroManager Chip provides all the necessary functions for power supply monitoring,

reset control, and memory backup in microprocessor-based systems. A precise internal voltage reference

and comparator circuit monitor power supply status. When an out-of-tolerance condition occurs, the

microprocessor reset and power-fail outputs are forced active, and static RAM control unconditionally

write protects external memory. The DS1236A also provides early warning detection of a user-defined

threshold by driving a non-maskable interrupt. External reset control is provided by a pushbutton reset

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011107

DS1236A

input which is debounced and activates reset outputs. An internal watchdog timer can also force the reset

outputs to the active state if the strobe input is not driven low prior to watchdog timeout. Reset control

and wake-up/sleep control inputs also provide the necessary signals for orderly shutdown and start-up in

battery backup and battery operated applications. A block diagram of the DS1236A is shown in NO TAG.

PIN DESCRIPTION

PIN NAME

BAT

CCO

DESCRIPTION

+3V battery input provides nonvolatile operation of control functions.

output for nonvolatile SRAM applications.

+5V primary power input.

Power-fail indicator, active high, used for external power switching as shown in NO

TAG.

Power-fail indicator, active low.

Wake-up and Sleep control. Invokes low-power mode.

Reset control input. Determines reset output . Normally low for NMOS processors and

high for battery backed CMOS processors.

Early warning power-fail input. This voltage sense point can be tied (via resistor

divider) to a user-selected voltage.

Non-maskable interrupt. Used in conjunction with the IN pin to indicate an impending

power failure.

Strobe input. A high-to-low transition will reset the watchdog timer, indicating that

software is still in control.

Chip enable output. Used with nonvolatile SRAM applications.

Chip enable input.

Pushbutton reset input.

Active low reset output.

Active high reset output.

WC/

NMI

CEO

CEI

PBRST

RST

PROCESSOR MODE

A distinction is often made between CMOS and NMOS processor systems. In a CMOS system, power

consumption may be a concern, and nonvolatile operation is possible by battery backing both the SRAM

and the CMOS processor. All resources would be maintained in the absence of V

. A power-down reset

is not issued since the low-power mode of most CMOS processors (Stop) is terminated with a Reset. A

pulsed interrupt (

NMI

) is issued to allow the CMOS processor to invoke a sleep mode to save power. For

this case, a power-on reset is desirable to wake up and initialize the processor. The CMOS mode is

invoked by connecting RC to V

CCO

An NMOS processor consumes more power, and consequently may not be battery backed. In this case, it

is desirable to notify the processor of a power-fail, then keep it in reset during the loss of V

. This avoids

intermittent or aberrant operation. On power-up, the processor will continue to be reset until V

reaches

an operational level to provide an orderly start. The NMOS mode is invoked by connecting RC to ground.

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DS1236AS-10+ Related Products

	DS1236AS-10+	DS1236AS-10N+T&R	DS1236AS-10N+	DS1236A-5N+	DS1236AS-5N+	DS1236A-10+
Description	Supervisory Circuits	Supervisory Circuits	Supervisory Circuits	Supervisory Circuits	Supervisory Circuits	Supervisory Circuits
Is it Rohs certified?	conform to	conform to	conform to	conform to	conform to	conform to
Maker	Maxim	Maxim	Maxim	Maxim	Maxim	Maxim
Parts packaging code	SOIC	SOIC	SOIC	DIP	SOIC	DIP
package instruction	0.300 INCH, SOIC-16	SOP, SOP16,.4	0.300 INCH, SOIC-16	DIP, DIP16,.3	0.300 INCH, SOIC-16	0.300 INCH, DIP-16
Contacts	16	16	16	16	16	16
Reach Compliance Code	unknown	compliant	unknown	compliant	unknown	unknown
ECCN code	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Other features	PUSHBUTTON RESET INPUT	PUSHBUTTON RESET INPUT	PUSHBUTTON RESET INPUT	PUSHBUTTON RESET INPUT	PUSHBUTTON RESET INPUT	PUSHBUTTON RESET INPUT
Adjustable threshold	NO	NO	NO	NO	NO	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT
JESD-30 code	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDIP-T16	R-PDSO-G16	R-PDIP-T16
JESD-609 code	e3	e3	e3	e3	e3	e3
length	10.3 mm	10.3 mm	10.3 mm	19.175 mm	10.3 mm	19.175 mm
Number of channels	2	2	2	2	2	2
Number of functions	1	1	1	1	1	1
Number of terminals	16	16	16	16	16	16
Maximum operating temperature	70 °C	85 °C	85 °C	85 °C	85 °C	70 °C
Minimum operating temperature	-	-40 °C	-40 °C	-40 °C	-40 °C	-
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	SOP	SOP	DIP	SOP	DIP
Encapsulate equivalent code	SOP16,.4	SOP16,.4	SOP16,.4	DIP16,.3	SOP16,.4	DIP16,.3
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	IN-LINE	SMALL OUTLINE	IN-LINE
Peak Reflow Temperature (Celsius)	260	260	260	260	260	260
power supply	5 V	5 V	5 V	5 V	5 V	5 V
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	2.68 mm	2.68 mm	2.68 mm	4.572 mm	2.68 mm	4.572 mm
Maximum supply current (Isup)	4 mA	4 mA	4 mA	4 mA	4 mA	4 mA
Nominal supply voltage (Vsup)	5 V	5 V	5 V	5 V	5 V	5 V
surface mount	YES	YES	YES	NO	YES	NO
technology	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	COMMERCIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	COMMERCIAL
Terminal surface	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING	GULL WING	THROUGH-HOLE	GULL WING	THROUGH-HOLE
Terminal pitch	1.27 mm	1.27 mm	1.27 mm	2.54 mm	1.27 mm	2.54 mm
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
width	7.5 mm	7.5 mm	7.5 mm	7.62 mm	7.5 mm	7.62 mm

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