TC54VC2801EMB datasheet, PDF - EEWORLD Datasheet

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TC54VC2801EMB: Description1-CHANNEL POWER SUPPLY SUPPORT CKT, PSSO3, SOT-89, 3 PIN; CategoryPower/power management The power supply circuit; File Size28KB，3 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com; Environmental Compliance

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TC54VC2801EMB Overview

1-CHANNEL POWER SUPPLY SUPPORT CKT, PSSO3, SOT-89, 3 PIN

TC54VC2801EMB Parametric

Parameter Name	Attribute value
Is it lead-free?	Lead free
Is it Rohs certified?	conform to
Maker	Microchip
Parts packaging code	SOT-89
package instruction	SOT-89, 3 PIN
Contacts	3
Reach Compliance Code	compliant
ECCN code	EAR99
Other features	DETECTION THRESHOLD VOLTAGE IS 2.8V
Adjustable threshold	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 code	R-PSSO-F3
JESD-609 code	e3
length	4.5 mm
Humidity sensitivity level	1
Number of channels	1
Number of functions	1
Number of terminals	3
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.6 mm
Maximum supply voltage (Vsup)	10 V
Minimum supply voltage (Vsup)	0.7 V
Nominal supply voltage (Vsup)	2.1 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Matte Tin (Sn)
Terminal form	FLAT
Terminal pitch	1.5 mm
Terminal location	SINGLE
Maximum time at peak reflow temperature	40
width	2.44 mm

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USING THE TELCOM TC54

VOLTAGE DETECTOR

APPLICATION NOTE 2

USING THE TELCOM TC54

VOLTAGE DETECTOR

AN-2

OPERATION

The TC54VN equivalent circuit is shown in Figure 1.

The internal precision temperature-compensated reference

and comparator circuit consistently monitor V

for an under-

voltage condition. When such a condition occurs, the output

is forced to the active (LOW) state and remains there until V

is once again within tolerance. As shown in the timing

diagram of Figure 1, the output is forced active when V

(–V

DET

) (Where (–V

DET

) is the threshold voltage) and returns

HIGH when V

exceeds (–V

DET

) plus 5% hysteresis (ex-

ample: if (–V

DET

) = 2.0V, the output will go HIGH when V

2.1V).

INTRODUCTION

TelCom's TC54 series of voltage detectors are de-

signed to supersede a variety of discrete comparator circuits

and bipolar technology voltage detectors.

These voltage detectors are especially suited for appli-

cation in battery powered systems because of their ex-

tremely low 1µA operating current. Each part is laser

programmed to the desired trip point voltage over the range

of 0.8V to 6.0V in 100mV steps. For complete design

flexibility, complementary or open-drain output versions are

available. TC54 package options include surface mount

SOT-23 and SOT-89 or through-hole TO-92 types.

TC54 BLOCK DIAGRAM AND TIMING

TC54VC only

–

INPUT VOLTAGE

HYSTERESIS

VOLTAGE

DETECT VOLTAGE (- V

DET

)

MINIMUM OPERATING

VOLTAGE

GROUND LEVEL

RELEASE

VOLTAGE (+ V

DET

)

OUT

OUTPUT VOLTAGE

REF

Figure 1.

GROUND LEVEL

TC54 AS A MICROPROCESSOR RESET

GENERATOR

Following a power outage, microprocessors require a

reset to get them back into their starting state. Commonly

used simple Schmitt trigger/capacitor circuits are inad-

equate since they do not accurately monitor the power

supply voltage tolerance. The TC54 series overcomes this

problem with precise voltage detection. Figure 2 shows a

reset circuit using a standard TC54 and external RC time

constant, replacing bipolar integrated voltage detectors

(see Table 1).

OUT

TC54VN

Microprocessor

Circuit

Figure 2. Microprocessor Reset Circuit using TC54

and External Delay

AN2-2 8/22/97

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