Analog Devices ADM810SART-REEL-7, ADM810SART-REEL, ADM810RART-REEL7, ADM810MART-REEL-7, ADM810LART-REEL-7 Datasheet

a		Microprocessor
		Supervisory Circuit in 3-Pin SOT-23
		ADM809/ADM810

FEATURES

Superior Upgrade for MAX809/MAX810 Specified Over Temperature

Low Power Consumption (17 mA)

Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options Reset Assertion Down to 1 V VCC

140 ms min Power-On Reset

Logic Low RESET Output (ADM809)

Logic High RESET Output (ADM810)

APPLICATIONS

Microprocessor Systems

Computers

Controllers

Intelligent Instruments

Automotive Systems

FUNCTIONAL BLOCK DIAGRAM

ADM809/ADM810
VCC	RESET	RESET
	GENERATOR
VREF	240ms	(RESET)
	GND

GENERAL DESCRIPTION

The ADM809/ADM810 supervisory circuits monitor the

power supply voltage in microprocessor systems. They pro- VCC vide a reset output during power-up, power-down and

brownout conditions. On power-up, an internal timer holds reset asserted for 240 ms. This holds the microprocessor in a reset state until conditions have stabilized. The RESET output remains operational with VCC as low as 1 V. The ADM809 provides an active low reset signal (RESET) while the ADM810 provides an active high signal (RESET) output.

Six reset threshold voltage options are available suitable for monitoring a variety of supply voltages. Refer to Table I.

The reset comparator features built-in glitch immunity, making it immune to fast transients on VCC.

The ADM809/ADM810 consumes only 17 μA, making it suitable for low power portable equipment. It is packaged in a 3-pin SOT-23 package.

VCC

VCC

ADM809 RESET

RESET

P

INPUT

SYSTEM

GND

GND

Figure 1. Typical Operating Circuit

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ADM809/ADM810–SPECIFICATIONS (VCC = Full Operating Range, TA = TMIN to TMAX, VCC typ = 5 V for L/M/J, 3.3 V for T/S, 3 V for R Models unless otherwise noted.)

Parameter	Min	Typ	Max	Units	Test Conditions/Comments
VCC Operating Voltage Range	1.0		5.5	V	TA = 0°C to +70°C
	1.2		5.5	V	TA = –40°C to +105°C
Supply Current		24	60	μA	VCC < 5.5 V, ADM8_L/M, TA = –40°C to +85°C
		17	50	μA	VCC < 3.6 V, ADM8_R/S/T, TA = –40°C to +85°C
			100	μA	VCC < 5.5 V, ADM8_L/M, TA = +85°C to +105°C
			100	μA	VCC < 3.6 V, ADM8_R/S/T, TA = +85°C to +105°C
RESET THRESHOLD
Reset Voltage Threshold					TA = +25°C
ADM8_L	4.56	4.63	4.70	V
ADM8_L	4.5		4.75	V	TA = –40°C to +85°C
ADM8_L	4.40		4.86	V	TA = +85°C to +105°C
ADM8_M	4.31	4.38	4.45	V	TA = +25°C
ADM8_M	4.25		4.5	V	TA = –40°C to +85°C
ADM8_M	4.16		4.56	V	TA = +85°C to +105°C
ADM8_Ê J	3.93	4.00	4.06	V	TA = +25°C
ADM8_ J	3.89		4.10	V	TA = –40°C to +85°C
ADM8_ J	3.80		4.20	V	TA = +85°C to +105°C
ADM8_T	3.04	3.08	3.11	V	TA = +25°C
ADM8_T	3.00		3.15	V	TA = –40°C to +85°C
ADM8_T	2.92		3.23	V	TA = +85°C to +105°C
ADM8_S	2.89	2.93	2.96	V	TA = +25°C
ADM8_S	2.85		3.00	V	TA = –40°C to +85°C
ADM8_S	2.78		3.08	V	TA = +85°C to +105°C
ADM8_R	2.59	2.63	2.66	V	TA = +25°C
ADM8_R	2.55		2.70	V	TA = –40°C to +85°C
ADM8_R	2.50		2.76	V	TA = +85°C to +105°C
Reset Threshold Temperature Coefficient		30		ppm/°C
VCC to Reset Delay		20		μs	VCC = VTH to (VTH –100 mV)
Reset Active Timeout Period	140	240	560	ms	TA = –40°C to +85°C
	100		840	ms	TA = +85°C to +105°C
RESET Output Voltage Low (ADM809)			0.3	V	VCC = VTH min, ISINK = 1.2 mA, ADM809R/S/T
			0.4	V	VCC = VTH min, ISINK = 3.2 mA, ADM809L/M
			0.3	V	VCC >1.0 V, ISINK = 50 μA
RESET Output Voltage High (ADM809)	0.8 VCC			V	VCC > VTH max, ISOURCE = 500 μA, ADM809R/S/T
	VCC–1.5			V	VCC > VTH max, ISOURCE = 800 μA, ADM809L/M
RESET Output Voltage Low (ADM810)			0.3	V	VCC = VTH min, ISINK = 1.2 mA, ADM810R/S/T
			0.4	V	VCC = VTH min, ISINK = 3.2 mA, ADM810L/M
RESET Output Voltage High (ADM810)	0.8 VCC			V	1.8 V < VCC < VTH min, ISOURCE = 150 μA

ABSOLUTE MAXIMUM RATINGS*

(TA = +25°C unless otherwise noted)

VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . –0.3 V to +6	V
RESET, RESET . . . . . . . . . . . . . . . . . .	–0.3 V to Vcc + 0.5	V
Input Current
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . 20 mA
Output Current
RESET, RESET . . . . . . . . . . . . . . . . .	. . . . . . . . . . . 20 mA
Rate of Rise, VCC . . . . . . . . . . . . . . . . . .	. . . . . . . . . . 100 V/μs

Power Dissipation, RT-3 SOT-23 . . . . . . . . . . . . . . . . 320 mW Derate by 4 mW/°C above +70°C

θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . 333°C/W Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300°C

Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . +215°C Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C

*Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum ratings for extended periods of time may affect device reliability.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM809/ADM810 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

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WARNING!

ESD SENSITIVE DEVICE

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