TS809RCXB [TSC]

Microprocessor Reset Circuit; 微处理器复位电路


型号：	TS809RCXB
厂家：	TAIWAN SEMICONDUCTOR COMPANY, LTD
描述：	Microprocessor Reset Circuit 微处理器复位电路微处理器复位电路
文件：	总6页 (文件大小：72K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TS809/ 810/ 809R/ 810R

Microprocessor Reset Circuit

Pin assignment:

TS809/810

1. Gnd

2. RESET (RESET)

3. Vcc

Threshold Voltage Option

From 2.63V ~ 4.63V

Pin assignment:

TS809R/810R

1. RESET (RESET)

2. Gnd

3. Vcc

General Description

The TS809/810/809R/810R are microprocessor (µP) supervisory circuit used to monitor the power supplies in µP and

digital systems. They provide excellent circuit reliability and low cost by eliminating external components and

adjustments when used with +5V, +3.3V, +3.0V powered circuits. These circuits perform a single function: they assert

a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least

240ms(typ) after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of

supply voltages are available. The TS809/810/809R/810R have push pull outputs. The TS809/809R have an active

low RESET output, while the TS810/810R has an active high RESET output. The reset comparator is designed to

ignore fast transients on VCC, and the output guaranteed to be in the correct logic state for VCC down to 1V. Low

supply correct makes the TS809/810/809R/810R ideal for use in portable equipment.

The TS809/810/809R/810R is available in a 3-pin SOT-23 package.

Features

Ordering Information

ꢀ

Precision monitoring of +3V, +3.3V and +5V

Part No.

TS809CX x

TS810CX x

TS809RCXx

TS810RCXx

Enable Function

Package

power supply voltage

Active-Low

Active-High

Active-Low

Active-High

ꢀ

Fully specified over temperature

Available in three output configurations

Push-Pull RESET low output (TS809 & TS809R)

Push-Pull RESET high output (TS810 & TS810R)

140mS min. power-on reset pulse width

12uA supply current

SOT-23

Note: x is the threshold voltage type, option as

A: 4.63V

B: 4.38V

C: 4.00V

D: 3.08V

E: 2.93V

F: 2.63V

ꢀ

Guaranteed reset valid to Vcc = +1V

Power supply transient immunity

No external components

Applications

Pin Descriptions

ꢀ

Computers

Name

Description

Controllers

Gnd

Ground

Intelligent instruments

Critical uP and uC power monitoring

Portable / Battery powered equipment

Automotive

Reset output pin

RESET

(RESET)

Vcc

L: for TS809 & TS811

H: for TS809R & TS811R

Operating voltage input

TS809/810/809R/810R

1-6

2004/09 rev. D

Absolute Maximum Rating

Terminal Voltage (with respect to Gnd)

RESET & (RESET) push-pull

V_CC

V_RESET

I_CC

- 0.3 ~ +6.0

- 0.3 ~ (V_CC+0.3)

Input Current, Vcc

Output Current, RESET, (RESET)

Continuous Power Dissipation (Ta=+70 ^oC)

de-rate 4mW/ ^oC above +70 ^oC

Operating Junction Temperature Range

Storage Temperature Range

I_O

P_D

320

T_OP

T_STG

T_LEAD

-40 ~ +105

-65 ~ +150

^oC

Lead Soldering Temperature (260 ^oC)

Electrical Characteristics (Ta = 25 ^oC, unless otherwise specified.)

Parameter

Input Supply Voltage

Supply Current

Conditions

Ta = 0 ^oC ~ +70 ^oC

Symbol

V_CC

Min

1.0

Typ

Max

5.5

Unit

V_CC≤ 5.5V

I_CC

V_CC≤ 3.6V

TS809/910/809R/810RCXA

TS809/910/809R/810RCXB

TS809/910/809R/810RCXC

TS809/910/809R/810RCXD

TS809/910/809R/810RCXE

TS809/910/809R/810RCXF

4.56

4.31

3.94

3.03

2.89

4.63

4.38

4.00

3.08

2.93

4.7

4.45

4.06

3.13

2.97

Reset Threshold

V_TH

2.59

2.63

2.67

Reset Threshold

V_TH

ppm/

^oC

Temperature Coefficient

Vcc Rising Time to Function

Ta = -20 ^oC ~ +105 ^oC

240

uS/V

V_CCto Reset Delay

V_CC= V_THto (V_TH- 100mV)

T_DELAY

100

600

0.3

Reset Active Timeout Period Ta = 0 ^oC ~ +70 ^oC

V_CC= V_TH(MIN),I_SINK=1.2mA,

TS809 & TS809R

V_CC= V_TH(MIN),I_SINK=3.2mA,

_CC> 1.0V, I_SINK=50uA

100

RESET Output Voltage Low

V_OL

0.4

0.3

RESET Output Voltage High V_CC> V_TH(MAX),I_SOURCE=500uA,

TS809 & TS809R

0.8 V_CC

V_OH

V_CC> V_TH(MAX),I_SOURCE=800uA,

V_{CC –}1.5

RESET Output Voltage Low

V_CC= V_TH(MAX),I_SINK=1.2mA,

TS810 & TS810R

0.3

V_OL

V_CC= V_TH(MAX),I_SINK=3.2mA,

0.4

RESET Output Voltage High 1.8V < V_CC< V_TH(MIN),

I_SOURCE=150uA,

V_OH

0.8 V_CC

TS810 & TS810R

TS809/810/809R/810R

2-6

2004/09 rev. D

Application Note

Function Description

Ensuring a Valid Reset Output

Down to Vcc=0

A microprocessor’s (µP’s) reset input starts the µP

In a know state. The TS809/810/809R/810R assert

reset to prevent code-execution errors during power-up,

power-down, or brownout conditions. They assert a

reset signal whenever the Vcc supply voltage declines

below a preset threshold, keeping it asserted for at

least 140ms after Vcc has risen above the reset

threshold. The TS809/810/809R/810R have a push-pull

output stage.

When Vcc falls below 1V, the TS809/810/809R/810R

RESET output no longer sinks current - it becomes an

open circuit. Therefore, high impedance CMOS logic

input connected to RESET can drift to undetermined

voltages.

This present no problem in most applications since

most µP and other circuitry is inoperative with Vcc

below 1V.However, in applications where RESET must

be valid down to 0V, adding a pull down resistor to

RESET causes and stray leakage currents to flow to

ground, holding RESET low (Figure 2.) R1’s value is

not critical; 100K is large enough not to load RESET

and small enough to pull RESET to ground. For the

TS809/810/809R/810R if RESET is required to remain

valid for Vcc<1V.

Applications Information

Negative-Going VCC transients in addition to issuing a

reset to the µP during power-up, power-down, and

brownout conditions, the TS809/810/809R/810R are

relatively immune to short-duration negative-going Vcc

transients (glitches).

The TS809/810/809R/810R do not generate a reset

pulse. The graph was generated using a negative going

pulse applied to Vcc, starting 0.5V above the actual

reset threshold and ending below it by the magnitude

indicated (reset comparator overdrive). The graph

indicates the maximum pulse width a negative going

Vcc transient can have without causing a reset pulse.

As the magnitude of the transient increases (goes

farther below the reset threshold), the maximum

allowable pulse width decreases. Typically, a Vcc

transient that goes 100mV below the reset threshold

and lasts 20µS or less will not cause a reset pulse. A

0.1µF bypass capacitor mounted as close as possible

to the Vcc pin provides additional transient immunity.

Benefits of Highly Accurate

Reset Threshold

Most µP supervisor ICs have reset threshold voltages

between 5% and 10% below the value of nominal

supply voltages. This ensures a reset will not occur

within 5% of the nominal supply, but will occur when

the supply is 10% below nominal. When using ICs

rated at only the nominal supply ±5%, this leaves a

zone of uncertainty where the supply is between 5%

and 10% low, and where the reset many or may not be

asserted.

Timing Diagram

Applications Circuit

TS809/810/809R/810R

3-6

2004/09 rev. D

Electrical Characteristics Curve

Figure 1. Iq v.s. Temperature

Figure 2. Threshold v.s. Temperature

Figure 3. Immunity

TS809/810/809R/810R

4-6

2004/09 rev. D

Function Block

Marking Information

Part No.

Identification

Code

Part No. Identification

Code

Part No.

Identification

Code

Part No.

Identification

Code

TS809CXA

TS809CXB

TS809CXC

TS809CXD

TS809CXE

TS809CXF

TS810CXA

TS810CXB

TS810CXC

TS810CXD

TS810CXE

TS810CXF

TS809RCXA

TS809RCXB

TS809RCXC

TS809RCXD

TS809RCXE

TS809RCXF

TS810RCXA

TS810RCXB

TS810RCXC

TS810RCXD

TS810RCXE

TS810RCXF

TS809/810/809R/810R

5-6

2004/09 rev. D

SOT-23 Mechanical Drawing

SOT-23 DIMENSION

MILLIMETERS

INCHES

MIN

DIM

MIN

2.88

0.39

1.78

0.51

1.59

1.04

0.07

MAX

2.91

0.42

2.03

0.61

1.66

1.08

0.09

MAX

0.115

0.017

0.080

0.024

0.065

0.043

0.004

0.113

0.015

0.070

0.020

0.063

0.041

0.003

TS809/810/809R/810R

6-6

2004/09 rev. D

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