STM6905 [STMICROELECTRONICS]

Quintuple, ultralow voltage supervisor with push-button reset; 五元组，超低电压监控器与按钮复位


型号：	STM6905
厂家：	ST
描述：	Quintuple, ultralow voltage supervisor with push-button reset 五元组，超低电压监控器与按钮复位监控
文件：	总19页 (文件大小：176K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

STM6905

Quintuple, ultralow voltage supervisor

with push-button reset

Features

■ Quintuple voltage monitoring

■ Accurate 1ꢀ8% across temperature voltage

threshold ( 1% at 25°C)

■ Primary supply (V ) monitorꢀ Fixed (factory -

programmed) reset thresholds: 3ꢀ078 V to

2ꢀ866 V

■ Second fixed (V2IN) monitorꢀ Fixed (factory-

programmed) reset thresholds: 2ꢀ333 V to

1ꢀ050 V

MSOP8

(TSSOP8) (DS)

■ Three additional adjustable supply monitor

inputs (externally adjustable)

■ 600 mV internal reference

■ RST output (open drain)

■ Output guaranteed for V ≥ 0ꢀ8 V

■ Reset delay time (t ) on power-up: 210 ms

rec

(typ)

Applications

■ Manual reset input (MR)

■ Low supply current of 12 µA (typ)

■ Power supply voltage 0ꢀ8 V to 5ꢀ5 V

■ RoHS compliant (green package)

■ 8-pin MSOP/TSSOP

■ Set-top boxes

■ Multi-voltage systems

■ Cable/satellite applications

■ Computer systems

■ Data storage equipment

■ Operating temperature: –40°C to 85°C

(industrial grade)

(1)

Table 1.

Device summary

Order code

V_RST1(V)

V_RST2(V)

t_REC(ms)

Package

STM6905TZEDS6F

STM6905TWEDS6F

STM6905TGEDS6F

STM6905SYEDS6F

STM6905SFEDS6F

STM6905PWEDS6F

3ꢀ078

2ꢀ955

2ꢀ866

2ꢀ333

1ꢀ683

1ꢀ110

2ꢀ188

1ꢀ050

1ꢀ683

210

MSOP8(TSSOP8)

1ꢀ Other reset threshold voltages and t_RECtime-out periods are offeredꢀ Minimum order quantities may applyꢀ Contact local

ST sales office for availabilityꢀ

January 2008

Rev 3

1/19

www.st.com

Contents

STM6905

Contents

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2ꢀ1

2ꢀ2

2ꢀ3

2ꢀ4

2ꢀ5

2ꢀ6

Push-button reset input (MR) ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 7

_CCprimary supply voltage monitoring input ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 7

V2IN second fixed voltage monitoring input ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 7

V_SS

ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 7

V3IN, V4IN, and V5IN ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 7

RST active-low, open drain reset output ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 7

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3ꢀ1

3ꢀ2

Setting the adjustable voltage levels for V3IN, V4IN, and V5IN inputs ꢀ ꢀ ꢀ ꢀ 9

Power on reset (t_REC) ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 9

Voltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Package marking information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2/19

STM6905

List of tables

Table 1ꢀ

Table 2ꢀ

Table 3ꢀ

Table 4ꢀ

Table 5ꢀ

Table 6ꢀ

Table 7ꢀ

Table 8ꢀ

Device summaryꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 1

Signal names and functions ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 6

Absolute maximum ratings ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 11

DC and AC characteristics ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 12

TSSOP 8-lead package mechanical dataꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 15

Ordering information scheme ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 16

Marking descriptionꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 17

Document revision history ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 18

3/19

List of figures

STM6905

List of figures

Figure 1ꢀ

Figure 2ꢀ

Figure 3ꢀ

Figure 4ꢀ

Figure 5ꢀ

Figure 6ꢀ

Figure 7ꢀ

Logic diagram ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 5

MSOP/TSSOP-8 connectionsꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 5

Functional block diagram ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 8

Typical hardware hookup application diagram ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 8

MR timing waveforms ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 10

Voltage monitoring diagram ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 10

TSSOP8, 3 x 3mm, package mechanical outline ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ 14

4/19

STM6905

Description

The STM6905 supervisor is a low voltage/low supply current processor supervisor,

designed to monitor up to five system power supply voltagesꢀ This device is targeted at

applications such as set-top boxes (STBs), portable, battery-powered systems, networking

and communication systemsꢀ

The device supports a push-button type manual reset input (MR)ꢀ Two of the five supply

monitors (V and V2IN) have fixed (customer-selectable, factory-trimmed) thresholds

and V

)ꢀ The other three voltage monitor inputs (V3IN, V4IN and V5IN) are

RST1

RST2

monitored using externally adjustable threshold (600 mV internal reference) to meet specific

level requirementsꢀ

If any of the five monitored voltages drops below its factory-trimmed or adjustable

thresholds, or if the MR is asserted to logic low, the reset output RST is asserted (driven

low)ꢀ Once asserted, RST is maintained Low for a minimum delay period (trec) after ALL

monitored supplies rise above their respective thresholds and MR returns to Highꢀ Reset

output logic state is valid for V greater than 0ꢀ8 Vꢀ

The STM6905 is available in a standard 8-lead MSOP (TSSOP) packageꢀ

Figure 1.

Logic diagram

V2IN

V3IN

STM6905

V4IN

V5IN

RST

ai13970

Figure 2.

MSOP/TSSOP-8 connections

RST

V5IN

V4IN

V3IN

V2IN

ai13971

5/19

Description

STM6905

Table 2.

Signal names and functions

Name

Type

Function

Input

Active-low manual reset input with internal pull-up resistor

Primary supply voltage input and integrated fixed threshold under-

voltage monitor

V_CC

Supply

V2IN

V_SS

Input

Supply

Input

Second fixed threshold input monitor

Ground

V3IN

V4IN

V5IN

RST

Adjustable third reset comparator input

Adjustable fourth reset comparator input

Adjustable fifth reset comparator input

Active-low open-drain reset output (10k ohm internal pull-up)

Input

Output

6/19

STM6905

Pin descriptions

2.1

Push-button reset input (MR)

When MR goes low the RST output is driven low, RST remains low as long as MR is low and

for t after MR returns to highꢀ The active-low input has an internal 10k ohm pull-up

REC

resistor to V ꢀ It can be driven from a TTL or CMOS logic line, or with open drain/collector

outputs, or connected to V through a switchꢀ If unused, leave this pin open or connect it to

ꢀ

Connect a normally open momentary switch from MR to V ; external debounce circuitry is

not requiredꢀ (If MR is driven from long cables or if the device is used in noisy environments,

connecting a 0ꢀ1uF capacitor from MR to V provides additional noise immunity)ꢀ

2.2

2.3

V_CCprimary supply voltage monitoring input

The V pin is also the input for the primary reset threshold monitorꢀ Fixed (customer-

selectable, factory programmed) reset thresholds include 3ꢀ078 V to 2ꢀ866 Vꢀ

V2IN second fixed voltage monitoring input

The V2IN input is the second fixed-voltage input for reset threshold monitoringꢀ Available

fixed (customer-selectable, factory programmed) reset thresholds include 2ꢀ333 V to

1ꢀ050 Vꢀ

2.4

2.5

V_SS

This pin is the ground pin for the power supplyꢀ

V3IN, V4IN, and V5IN

The V3IN, V4IN and V5IN are high impedance inputsꢀ RST is driven low when the voltage

(VTRIP) at the pin falls below 600 mV (internal reference voltage at their respective

comparators)ꢀ The monitored voltage reset threshold is set with an external resistor-divider

networkꢀ

2.6

RST active-low, open drain reset output

The reset output (RST) pin is driven low and stays low whenever V or V2IN, or V3IN, or

V4IN, or V5IN falls below its factory-trimmed or adjustable reset threshold or when MR

goes to logic lowꢀ It remains low for trec after all supply voltages being monitored rise above

their reset thresholds and MR goes from low to highꢀ Connect an external pull-up resistor to

ꢀ A 10k ohms pull-up resistor should be sufficient for most applicationsꢀ

7/19

Pin descriptions

STM6905

Figure 3.

Functional block diagram

COMPARE

RST1

V2IN

RST2

V3IN

V4IN

rec

Generator

RST

= 0ꢀ6V

REF

V5IN

REF

= 0ꢀ6V

(1)

ai13970

1ꢀ Internal pull-up on MR input of 10k ohm (typ)ꢀ

Figure 4.

Typical hardware hookup application diagram

From DC/DC Converter

CC2

CC1

R1 + R2

R3 + R4

(600mV)

TRIP

(

)

TRIP

0ꢀ1 F

STM6905

R5 + R6

(600mV)

VIN2

CC3

0ꢀ1 F

RST

RST (To Processor Reset)

VIN3

VIN4

CC4

Push-button

Switch

CC5

VIN5

ai13973

8/19

STM6905

Operation

The STM6905 provides the ability to monitor critical voltages such as power-supply and

battery voltage levels, while interfacing easily to the system controllers/microprocessorsꢀ

Figure 4 shows typical hardware hookup for monitoring five voltages; two fixed thresholds

(customer-selectable, factory-programmed ) and three adjustable monitor inputsꢀ RST

output is open drain and requires a 10k ohms pull-up resistor tied to V

ꢀ

3.1

Setting the adjustable voltage levels for V3IN, V4IN, and V5IN

inputs

The user can customize the minimum voltage levels for the three adjustable voltage inputs

by connecting an external resistor divider network to the V3IN, V4IN and V5IN pins in order

to set the trip point at some voltage above the 600 mv (V

formulaꢀ

) according to the following

REF

R1+ R2

VTRIP = 0.6V ×

During normal operation, the STM6905 monitors the voltage levels at all the five pins (Vcc,

V2IN, V3IN, V4IN and V5IN)ꢀ

3.2

Power on reset (t_REC)

On power up, the STM6905 activates a power on reset circuit which asserts the reset pin

(iꢀeꢀ RST goes low)ꢀ The RST signal remains active until V (and V2IN, V3IN, V4IN, V5IN

and MR) rises above the minimum voltage level for the time period t

that the supply voltage has stabilized to sufficient operating levelsꢀ

thereby ensuring

REC

9/19

Voltage monitoring

STM6905

Voltage monitoring

Figure 5.

MR timing waveforms

MLMH

MLMR

RST

REC

ai13974

Figure 6.

Voltage monitoring diagram

VXIN

RST1/2

RSTIN

t_RD

rec

RST

ai13975

10/19

STM6905

Maximum rating

Stressing the device above the rating listed in the "Absolute maximum ratings" table may

cause permanent damage to the deviceꢀ These are stress ratings only and operation of the

device at these or any other conditions above those indicated in the Operating sections of

this specification is not impliedꢀ Exposure to absolute maximum rating conditions for

extended periods may affect device reliabilityꢀ Refer also to the STMicroelectronics SURE

Program and other relevant quality documentsꢀ

Table 3.

Symbol

T_STG

Absolute maximum ratings

Parameter

Value

Unit

Storage temperature (V_CCoff)

Lead solder temperature for 10 seconds

Input or output voltage

-55 to +150

260

°C

(1)

T_SLD

V_IO

V_CC

I_O

-0ꢀ3 to V_CC+0ꢀ3

-0ꢀ3 to 7ꢀ0

Supply voltage

Output current

°C/W

θ_JA

Thermal resistance (junction to ambient)

146

1ꢀ Reflow at peak temperature of 255°C to 260°C for < 30 seconds (total thermal budget not to exceed

180°C for between 90 to 150 seconds)ꢀ

11/19

DC and AC parameters

STM6905

DC and AC parameters

This section summarizes the operating measurement conditions and the DC and AC

characteristics of the deviceꢀ Designers should check that the operating conditions in their

circuit match the operating conditions when relying on the quoted parametersꢀ

Table 4.

Sym

DC and AC characteristics

Alter-

Description

Operating voltage

V_CCsupply current

V2IN supply curent

Test condition⁽¹⁾

Min

Typ

Max

Unit

native

V_CC

I_CC

0ꢀ8

5ꢀ5

V_CC< 5ꢀ5 V

µA

V_CC= 3ꢀ3 V

V2IN = 3ꢀ3 V

I2IN

I_LI

µA

Input leakage current -

(MR)⁽²⁾

V_IN= V_CCor V_SS

-0ꢀ5

+0ꢀ5

V_CC> VRST;

Open drain RST output

leakage current

(3)

I_LO

µA

RST not asserted

V_CC≥ 0ꢀ8V, I_SINK= 1 µA

V_CC≥ 1ꢀ0V, I_SINK= 50 µA

V_CC≥ 1ꢀ2V, I_SINK= 100 µA

V_CC≥ 2ꢀ7V, I_SINK= 1ꢀ2 mA

V_CC≥ 4ꢀ5V, I_SINK= 3ꢀ2 mA

0ꢀ3

Output low voltage

(RST; open drain)

V_OL

0ꢀ3

0ꢀ4

25°C

T (falling)

3ꢀ047

3ꢀ023

2ꢀ925

2ꢀ902

2ꢀ837

2ꢀ814

2ꢀ310

2ꢀ291

2ꢀ166

2ꢀ149

1ꢀ666

1ꢀ653

1ꢀ099

1ꢀ090

1ꢀ040

1ꢀ031

3ꢀ078

2ꢀ955

2ꢀ866

2ꢀ333

2ꢀ188

1ꢀ683

1ꢀ110

1ꢀ050

3ꢀ109

3ꢀ133

2ꢀ985

3ꢀ008

2ꢀ895

2ꢀ918

2ꢀ356

2ꢀ375

2ꢀ210

2ꢀ227

1ꢀ700

1ꢀ713

1ꢀ121

1ꢀ130

1ꢀ061

1ꢀ069

-40°C to 85°C

25°C

S (falling)

(4)

V_RST1

V_TH1V_CCreset threshold

-40°C to 85°C

25°C

P (falling)

-40°C to 85°C

25°C

Z (falling)

-40°C to 85°C

25°C

Y (falling)

-40°C to 85°C

25°C

W (falling)

(4)

V_RST2

V_TH2V2IN reset threshold

-40°C to 85°C

25°C

G (falling)

-40°C to 85°C

25°C

F (falling)

-40°C to 85°C

12/19

STM6905

DC and AC parameters

Table 4.

Sym

DC and AC characteristics (continued)

Alter-

Description

Test condition⁽¹⁾

Min

Typ

Max

Unit

native

Reset threshold

hysteresis

Referenced to V_RST1/V_RST2

typical

V_HYST

0ꢀ5

µs

V_CC= (V_RST1+ 100 mV) to

(V_RST1– 100 mV)

t_RD

V_CCto RST delay

V2IN = (V_RST2+ 75 mV) to

(V_RST2– 75 mV)

Option B⁽⁵⁾

Option C⁽⁵⁾

Option E

120

210

420

180

280

560

t_REC

t_RP

RST time-out period

140

280

Option F⁽⁵⁾

Adjustable reset comparator input (V3IN, V4IN, V5IN)

V3IN, V4IN, V5IN input

threshold

V_RSTIN

589

–25

600

611

+25

µs

V3IN, V4IN, V5IN input

current

I_RSTIN

V3IN, V4IN, V5IN > 0ꢀ8 V

V3IN, V4IN, V5IN

hysteresis

V3IN, V4IN, V5IN to

RST output delay

t_RSTIND

VRSTIN to (VRSTIN – 30 mV)

Manual (push-button) reset input

V_IL

0ꢀ3 x V_CC

MR input voltage

V_IH

0ꢀ7 x V_CC

MR minimum pulse

width

t_MLMH

t_MLRL

t_MR

µs

t_MRDMR to RST output delay

MR glitch immunity

200

100

MR pull-up resistance

kΩ

1ꢀ Valid for ambient operating temperature: T_A= –40°C to +85°C; V_CC= 0ꢀ8 V to 5ꢀ5 V (except where noted)ꢀ

2ꢀ 10k ohm (typ) internal pull-up resistorꢀ

3ꢀ The leakage current measured on the RST pin is tested with the reset de-asserted (output high impedance)ꢀ

4ꢀ Other reset threshold voltages are offeredꢀ Minimum order quantities may applyꢀ Contact local sales office for availabilityꢀ

5ꢀ Other t_RECtime-out periods are offeredꢀ Minimum order quantities may applyꢀ Contact local sales office for availabilityꢀ

13/19

Package mechanical data

STM6905

Package mechanical data

In order to meet environmental requirements, ST offers these devices in ECOPACK

packagesꢀ These packages have a lead-free second level interconnectꢀ The category of

second level interconnect is marked on the package and on the inner box label, in

compliance with JEDEC Standard JESD97ꢀ The maximum ratings related to soldering

conditions are also marked on the inner box labelꢀ ECOPACK is an ST trademarkꢀ

ECOPACK specifications are available at: wwwꢀstꢀcomꢀ

Figure 7.

TSSOP8, 3 x 3mm, package mechanical outline

ccc

E3_ME

14/19

STM6905

Package mechanical data

Table 5.

Symbol

TSSOP 8-lead package mechanical data

inches

Min

Typ

Max

Min

Typ

Max

1ꢀ100

0ꢀ15

0ꢀ95

0ꢀ40

0ꢀ23

0ꢀ10

3ꢀ20

0ꢀ043

0ꢀ006

0ꢀ037

0ꢀ016

0ꢀ009

0ꢀ004

0ꢀ126

0ꢀ00

0ꢀ75

0ꢀ22

0ꢀ08

0ꢀ000

0ꢀ030

0ꢀ009

0ꢀ003

0ꢀ85

0ꢀ034

ccc

2ꢀ80

3ꢀ00

0ꢀ65

4ꢀ90

3ꢀ00

0ꢀ60

0ꢀ95

0ꢀ25

0ꢀ110

0ꢀ118

0ꢀ026

0ꢀ193

0ꢀ118

0ꢀ024

0ꢀ037

0ꢀ010

4ꢀ65

2ꢀ80

0ꢀ40

5ꢀ15

3ꢀ10

0ꢀ80

0ꢀ183

0ꢀ110

0ꢀ016

0ꢀ203

0ꢀ122

0ꢀ032

⁰°

6°

0°

6°

15/19

Part numbering

STM6905

Part numbering

Table 6.

Ordering information scheme

STM6905

Example:

Device type

STM6905

Reset threshold voltages⁽¹⁾

Suffix V_RST1

V_RST2

2ꢀ333

1ꢀ683

1ꢀ110

1ꢀ050

1ꢀ683

3ꢀ078

2ꢀ955

2ꢀ866

t_REC

B = 30 ms⁽¹⁾

C = 120 ms⁽¹⁾

E = 210 ms

F = 420 ms⁽¹⁾

Package

DS = MSOP8 (TSSOP8)

Temperature range

6: -40°C to 85°C

Shipping method

E = ECOPACK^®package, tubes

F = ECOPACK^®package, tape & reel

1ꢀ Other reset threshold voltages and t_RECtime-out periods are offeredꢀ Minimum order quantities may

applyꢀ Contact local sales office for availabilityꢀ

16/19

STM6905

Package marking information

Table 7.

Marking description

Part marking

V_RST1(V)

V_RST2(V)

Package

Topside marking

STM6905TZEDS6F

STM6905TWEDS6F

STM6905TGEDS6F

STM6905SYEDS6F

STM6905SFEDS6F

STM6905PWEDS6F

3ꢀ078

2ꢀ955

2ꢀ866

2ꢀ333

1ꢀ683

1ꢀ110

2ꢀ188

1ꢀ050

1ꢀ683

MSOP (TSSOP8)

STZE

STWE

STGE

SSYE

SSFE

SPWE

17/19

Revision history

STM6905

Revision history

Table 8.

Date

Document revision history

Revision

Changes

19-Dec-2007

23-Jan-2008

28-Jan-2008

Initial releaseꢀ

Document status upgraded to full datasheetꢀ

Updated cover page, Figure 6, and Table 4ꢀ

18/19

STM6905

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19/19

STM6905 [STMICROELECTRONICS]

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