DS1232LPS-2 datasheet, PDF - EEWORLD Datasheet

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DS1232LPS-2: DescriptionSupervisory Circuits Low Power MicroMonitor Chip; CategoryPower/power management The power supply circuit; File Size98KB，7 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1232LPS-2 Overview

Supervisory Circuits Low Power MicroMonitor Chip

DS1232LPS-2 Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Parts packaging code	SOIC
package instruction	0.150 INCH, SOIC-8
Contacts	8
Reach Compliance Code	not_compliant
ECCN code	EAR99
Factory Lead Time	1 week
Other features	PUSHBUTTON RESET OPTION
Adjustable threshold	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 code	R-PDSO-G8
JESD-609 code	e0
length	4.9 mm
Humidity sensitivity level	1
Number of channels	1
Number of functions	1
Number of terminals	8
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	245
power supply	5 V
Certification status	Not Qualified
Maximum seat height	1.75 mm
Maximum supply current (Isup)	0.5 mA
Maximum supply voltage (Vsup)	5.5 V
Minimum supply voltage (Vsup)	4.5 V
Nominal supply voltage (Vsup)	5 V
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Threshold voltage nominal	+4.37/4.62V
Maximum time at peak reflow temperature	NOT SPECIFIED
width	3.9 mm
Base Number Matches	1

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DS1232LP/LPS

Low Power MicroMonitor Chip

www.dalsemi.com

FEATURES

Super-low power version of DS1232

µA

quiescent current

Halts and restarts an out-of-control

microprocessor

Automatically restarts microprocessor after

power failure

Monitors pushbutton for external override

Accurate 5% or 10% microprocessor power

supply monitoring

8-pin DIP, 8-pin SOIC or space saving

µ-SOP

package available

Optional 16-pin SOIC package available

Industrial temperature -40°C to +85°C

available, designated N

PIN ASSIGNMENT

PBRST

TOL

GND

RST

PBRST

TOL

DS1232LP 8-Pin DIP (300-mil)

See Mech. Drawings Section

GND

VCC

RST

DS1232LPS 16-Pin SOIC (300-mil)

See Mech. Drawings Section

RST

PBRST

TOL

GND

PBRST

TOL

GND

VCC

RST

DS1232LPµ (118-mil

µ-SOP)

See Mech. Drawings Section

DS1232LPS-2 8-Pin SOIC (150-mil)

See Mech. Drawings Section

PIN DESCRIPTION

PBRST

TOL

GND

RST

- Pushbutton Reset Input

- Time Delay Set

- Selects 5% or 10% V

Detect

- Ground

- Reset Output (Active High)

- Reset Output (Active Low, open

drain)

- Strobe Input

- +5 Volt Power

DESCRIPTION

The DS1232LP/LPS Low Power MicroMonitor Chip monitors three vital conditions for a

microprocessor: power supply, software execution, and external over-ride. First, a precision temperature-

compensated reference and comparator circuit monitors the status of V

. When an out-of-tolerance

condition occurs, an internal power-fail signal is generated which forces reset to the active state. When

returns to an in-tolerance condition, the reset signals are kept in the active state for a minimum of

250 ms to allow the power supply and processor to stabilize.

1 of 7

111899

DS1232LP/LPS

The second function the DS1232LP/LPS performs is pushbutton reset control. The DS1232LP/LPS

debounces the pushbutton input and guarantees an active reset pulse width of 250 ms minimum. The third

function is a watchdog timer. The DS1232LP/LPS has an internal timer that forces the reset signals to the

active state if the strobe input is not driven low prior to timeout. The watchdog timer function can be set

to operate on timeout settings of approximately 150 ms, 600 ms, and 1.2 seconds.

OPERATION - POWER MONITOR

The DS1232LP/LPS detects out-of-tolerance power supply conditions and warns a processor-based

system of impending power failure. When V

falls below a preset level as defined by TOL, the V

comparator outputs the signals RST and

RST

. When TOL is connected to ground, the RST and

RST

signals become active as V

falls below 4.75 volts. When TOL is connected to V

, the RST and

RST

signals become active as V

falls below 4.5 volts. The RST and

RST

are excellent control signals for a

microprocessor, as processing is stopped at the last possible moments of valid V

. On power-up, RST

and

RST

are kept active for a minimum of 250 ms to allow the power supply and processor to stabilize.

OPERATION - PUSHBUTTON RESET

The DS1232LP/LPS provides an input pin for direct connection to a pushbutton (Figure 1). The

pushbutton reset input requires an active low signal. Internally, this input is debounced and timed such

that RST and

RST

signals of at least 250 ms minimum are generated. The 250 ms delay starts as the

pushbutton reset input is released from low level.

OPERATION - WATCHDOG TIMER

The watchdog timer function forces RST and

RST

signals to the active state when the

input is not

stimulated for a predetermined time period. The time period is set by the TD input to be typically 150 ms

with TD connected to ground, 600 ms with TD left unconnected, and 1.2 seconds with TD connected to

. The watchdog timer starts timing out from the set time period as soon as RST and

RST

are inactive.

If a high-to-low transition occurs on the

input pin prior to timeout, the watchdog timer is reset and

begins to timeout again. If the watchdog timer is allowed to timeout, then the RST and

RST

signals are

driven to the active state for 250 ms minimum. The

input can be derived from microprocessor address

signals, data signals, and/or control signals. When the microprocessor is functioning normally, these

signals would, as a matter of routine, cause the watchdog to be reset prior to timeout. To guarantee that

the watchdog timer does not timeout, a high-to-low transition must occur at or less than the minimum

shown in Table 1. A typical circuit example is shown in Figure 2.

2 of 7

DS1232LPS-2 Related Products

	DS1232LPS-2	DS1232LPS	DS1232LPN-	DS1232LPN	DS1232LPSN-2+T&R	DS1232LPS-2+T&R	DS1232LPSN	CPF-2391JT-1R36	DS1232LPS+	DS1232LPU+
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Is it lead-free?	Contains lead	-	-	Contains lead	Lead free	Lead free	Contains lead	-	Lead free	Lead free
Is it Rohs certified?	incompatible	-	-	incompatible	conform to	conform to	incompatible	incompatible	conform to	conform to
Parts packaging code	SOIC	-	-	DIP	SOIC	SOIC	SOIC	-	SOIC	SOIC
package instruction	0.150 INCH, SOIC-8	-	-	0.300 INCH, DIP-8	SOP, SOP8,.25	SOP, SOP8,.25	0.300 INCH, SOIC-16	-	SOP, SOP16,.4	TSSOP, TSSOP8,.19
Contacts	8	-	-	8	8	8	16	-	16	8
Reach Compliance Code	not_compliant	-	-	not_compliant	compliant	compliant	not_compliant	compliant	compliant	compliant
ECCN code	EAR99	-	-	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Other features	PUSHBUTTON RESET OPTION	-	-	PUSHBUTTON RESET OPTION	PUSHBUTTON RESET OPTION	PUSHBUTTON RESET OPTION	PUSHBUTTON RESET OPTION	-	PUSHBUTTON RESET OPTION	PUSHBUTTON RESET
Adjustable threshold	NO	-	-	NO	NO	NO	NO	-	NO	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY SUPPORT CIRCUIT	-	-	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY SUPPORT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	-	POWER SUPPLY SUPPORT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT
JESD-30 code	R-PDSO-G8	-	-	R-PDIP-T8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G16	-	R-PDSO-G16	R-PDSO-G8
JESD-609 code	e0	-	-	e0	e3	e3	e0	e0	e3	e3
length	4.9 mm	-	-	9.375 mm	4.9 mm	4.9 mm	10.3 mm	-	10.3 mm	3 mm
Humidity sensitivity level	1	-	-	1	1	1	1	-	1	1
Number of channels	1	-	-	1	1	1	1	-	1	1
Number of functions	1	-	-	1	1	1	1	-	1	1
Number of terminals	8	-	-	8	8	8	16	2	16	8
Maximum operating temperature	70 °C	-	-	85 °C	85 °C	70 °C	85 °C	230 °C	70 °C	70 °C
Package body material	PLASTIC/EPOXY	-	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	-	-	DIP	SOP	SOP	SOP	-	SOP	TSSOP
Encapsulate equivalent code	SOP8,.25	-	-	DIP8,.3	SOP8,.25	SOP8,.25	SOP16,.4	-	SOP16,.4	TSSOP8,.19
Package shape	RECTANGULAR	-	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	-	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	-	-	IN-LINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	Axial	SMALL OUTLINE	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	245	-	-	240	260	260	245	-	260	260
power supply	5 V	-	-	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	Not Qualified
Maximum seat height	1.75 mm	-	-	4.572 mm	1.75 mm	1.75 mm	2.65 mm	-	2.65 mm	1.1 mm
Maximum supply current (Isup)	0.5 mA	-	-	0.5 mA	0.5 mA	0.5 mA	0.5 mA	-	0.5 mA	0.5 mA
Maximum supply voltage (Vsup)	5.5 V	-	-	5.5 V	5.5 V	5.5 V	5.5 V	-	5.5 V	5.5 V
Minimum supply voltage (Vsup)	4.5 V	-	-	4.5 V	4.5 V	4.5 V	4.5 V	-	4.5 V	4.5 V
Nominal supply voltage (Vsup)	5 V	-	-	5 V	5 V	5 V	5 V	-	5 V	5 V
surface mount	YES	-	-	NO	YES	YES	YES	-	YES	YES
technology	CMOS	-	-	CMOS	CMOS	CMOS	CMOS	METAL FILM	CMOS	CMOS
Temperature level	COMMERCIAL	-	-	INDUSTRIAL	INDUSTRIAL	COMMERCIAL	INDUSTRIAL	-	COMMERCIAL	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)	-	-	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Matte Tin (Sn)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	-	-	THROUGH-HOLE	GULL WING	GULL WING	GULL WING	-	GULL WING	GULL WING
Terminal pitch	1.27 mm	-	-	2.54 mm	1.27 mm	1.27 mm	1.27 mm	-	1.27 mm	0.65 mm
Terminal location	DUAL	-	-	DUAL	DUAL	DUAL	DUAL	-	DUAL	DUAL
Threshold voltage nominal	+4.37/4.62V	-	-	+4.37/4.62V	+4.37/4.62V	+4.37/4.62V	+4.37/4.62V	-	+4.37/4.62V	+4.37/4.62V
Maximum time at peak reflow temperature	NOT SPECIFIED	-	-	20	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	-	NOT SPECIFIED	30
width	3.9 mm	-	-	7.62 mm	3.9 mm	3.9 mm	7.5 mm	-	7.5 mm	3 mm
Base Number Matches	1	-	-	-	1	1	1	-	1	1

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