DS1236N-5 datasheet, PDF - EEWORLD Datasheet

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DS1236N-5: DescriptionPower Supply Management Circuit, Fixed, 1 Channel, CMOS, PDIP16, 0.300 INCH, DIP-16; CategoryPower/power management The power supply circuit; File Size321KB，19 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS1236N-5 Overview

Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDIP16, 0.300 INCH, DIP-16

DS1236N-5 Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	DALLAS
package instruction	0.300 INCH, DIP-16
Reach Compliance Code	unknown
Other features	PUSHBUTTON RESET OPTION
Adjustable threshold	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY MANAGEMENT CIRCUIT
JESD-30 code	R-PDIP-T16
JESD-609 code	e0
Number of channels	1
Number of functions	1
Number of terminals	16
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	DIP
Encapsulate equivalent code	DIP16,.3
Package shape	RECTANGULAR
Package form	IN-LINE
power supply	5 V
Certification status	Not Qualified
Maximum supply current (Isup)	4 mA
Maximum supply voltage (Vsup)	5.5 V
Minimum supply voltage (Vsup)	4.75 V
Nominal supply voltage (Vsup)	5 V
surface mount	NO
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	THROUGH-HOLE
Terminal pitch	2.54 mm
Terminal location	DUAL

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DS1236

MicroManager Chip

www.dalsemi.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 DS1236-5

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

RCI

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 DS1236 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 DS1236 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

1 of 19

111899

DS1236

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 startup in

battery backup and battery operated applications. A block diagram of the DS1236 is shown in Figure 1.

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

Figure 9.

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.

2 of 19

DS1236N-5 Related Products

	DS1236N-5	DS1236S-5N	DS1236S-5	DS1236S-10	DS1236S-10N
Description	Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDIP16, 0.300 INCH, DIP-16	Power Supply Management Circuit, Fixed, 2 Channel, PDSO16,	Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDSO16, 0.300 INCH, SOIC-16	Power Supply Management Circuit, Fixed, 2 Channel, CMOS, PDSO16,	Power Supply Management Circuit, Fixed, 2 Channel, CMOS, PDSO16,
Maker	DALLAS	DALLAS	DALLAS	DALLAS	DALLAS
Reach Compliance Code	unknown	unknown	unknown	unknown	unknown
Other features	PUSHBUTTON RESET OPTION	PUSHBUTTON RESET INPUT	PUSHBUTTON RESET OPTION	PUSHBUTTON RESET INPUT	PUSHBUTTON RESET INPUT
Adjustable threshold	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
JESD-30 code	R-PDIP-T16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16
Number of channels	1	2	1	2	2
Number of functions	1	1	1	1	1
Number of terminals	16	16	16	16	16
Maximum operating temperature	85 °C	85 °C	70 °C	70 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-	-	-40 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	IN-LINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Nominal supply voltage (Vsup)	5 V	5 V	5 V	5 V	5 V
surface mount	NO	YES	YES	YES	YES
Temperature level	INDUSTRIAL	INDUSTRIAL	COMMERCIAL	COMMERCIAL	INDUSTRIAL
Terminal form	THROUGH-HOLE	GULL WING	GULL WING	GULL WING	GULL WING
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL
Is it Rohs certified?	incompatible	-	incompatible	incompatible	incompatible
JESD-609 code	e0	-	e0	e0	e0
encapsulated code	DIP	-	SOP	SOP	SOP
Encapsulate equivalent code	DIP16,.3	-	SOP16,.4	SOP16,.4	SOP16,.4
power supply	5 V	-	5 V	5 V	5 V
Maximum supply current (Isup)	4 mA	-	4 mA	4 mA	-
technology	CMOS	-	CMOS	CMOS	CMOS
Terminal surface	Tin/Lead (Sn/Pb)	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Terminal pitch	2.54 mm	-	1.27 mm	1.27 mm	1.27 mm

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