ST STM6905 User Manual

Quintuple, ultralow voltage supervisor

Features

■ Quintuple voltage monitoring

■ Accurate ±1.8% across temperature voltage

threshold (±1% at 25°C)

■ Primary supply (V

programmed) reset thresholds: 3.078 V to

2.866 V

■ Second fixed (V2IN) monitor. Fixed (factory-

programmed) reset thresholds: 2.333 V to

1.050 V

■ Three additional adjustable supply monitor

inputs (externally adjustable)

■ 600 mV internal reference

■ RST output (open drain)

■ Output guaranteed for V

■ Reset delay time (t

(typ)

■ Manual reset input (MR)

■ Low supply current of 12 µA (typ)

■ Power supply voltage 0.8 V to 5.5 V

■ RoHS compliant (green package)

■ 8-pin MSOP/TSSOP

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

(industrial grade)

) monitor. Fixed (factory -

CC

≥ 0.8 V

CC

) on power-up: 210 ms

rec

STM6905

with push-button reset

MSOP8

(TSSOP8) (DS)

Applications

■ Set-top boxes

■ Multi-voltage systems

■ Cable/satellite applications

■ Computer systems

■ Data storage equipment

Table 1. Device summary

Order code V

(1)

(V) V

RST1

(V) t

RST2

(ms) Package

REC

STM6905TZEDS6F 3.078 2.333 210 MSOP8(TSSOP8)

STM6905TWEDS6F 3.078 1.683 210 MSOP8(TSSOP8)

STM6905TGEDS6F 3.078 1.110 210 MSOP8(TSSOP8)

STM6905SYEDS6F 2.955 2.188 210 MSOP8(TSSOP8)

STM6905SFEDS6F 2.955 1.050 210 MSOP8(TSSOP8)

STM6905PWEDS6F 2.866 1.683 210 MSOP8(TSSOP8)

1. Other reset threshold voltages and t
ST sales office for availability.

time-out periods are offered. Minimum order quantities may apply. Contact local

REC

January 2008 Rev 3 1/19

www.st.com

1

Contents STM6905

Contents

1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

2.1 Push-button reset input (MR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 V

2.3 V2IN second fixed voltage monitoring input . . . . . . . . . . . . . . . . . . . . . . . . 7

2.4 V

2.5 V3IN, V4IN, and V5IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.6 RST

primary supply voltage monitoring input . . . . . . . . . . . . . . . . . . . . . . . 7

CC

SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

active-low, open drain reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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

3.2 Power on reset (t

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

REC

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

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

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

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

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

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

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

2/19

STM6905 List of tables

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. Signal names and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 4. DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 5. TSSOP 8-lead package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 6. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 7. Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 8. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3/19

List of figures STM6905

List of figures

Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. MSOP/TSSOP-8 connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3. Functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 4. Typical hardware hookup application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 5. MR

Figure 6. Voltage monitoring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 7. TSSOP8, 3 x 3mm, package mechanical outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

timing waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4/19

STM6905 Description

1 Description

The STM6905 supervisor is a low voltage/low supply current processor supervisor,
designed to monitor up to five system power supply voltages. This device is targeted at
applications such as set-top boxes (STBs), portable, battery-powered systems, networking
and communication systems.

The device supports a push-button type manual reset input (MR
monitors (V
(V

RST1

and V

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

CC

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

RST2

). Two of the five supply

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

If any of the five monitored voltages drops below its factory-trimmed or adjustable
thresholds, or if the MR
low). Once asserted, RST
monitored supplies rise above their respective thresholds and MR
output logic state is valid for V

is asserted to logic low, the reset output RST is asserted (driven

is maintained Low for a minimum delay period (trec) after ALL

returns to High. Reset

greater than 0.8 V.

CC

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

Figure 1. Logic diagram

V

CC

V2IN

V3IN

V4IN

V5IN

STM6905

RST

MR

V

Figure 2. MSOP/TSSOP-8 connections

MR

V

CC

V2IN

V

SS

1

2

3

4

5/19

SS

ai13970

8

7

6

5

RST

V5IN

V4IN

V3IN

ai13971

Description STM6905

Table 2. Signal names and functions

Pin Name Type Function

1MR

2VCCSupply

3 V2IN Input Second fixed threshold input monitor

4V

5 V3IN Input Adjustable third reset comparator input

6 V4IN Input Adjustable fourth reset comparator input

7 V5IN Input Adjustable fifth reset comparator input

8RST

SS

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

Primary supply voltage input and integrated fixed threshold under­voltage monitor

Supply Ground

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

6/19

STM6905 Pin descriptions

2 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
resistor to V
outputs, or connected to V
V

Connect a normally open momentary switch from MR
not required. (If MR
connecting a 0.1uF capacitor from MR

2.2 VCC primary supply voltage monitoring input

The VCC pin is also the input for the primary reset threshold monitor. Fixed (customer­selectable, factory programmed) reset thresholds include 3.078 V to 2.866 V.

after MR returns to high. The active-low input has an internal 10k ohm pull-up

CC

REC

.

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

CC

is driven from long cables or if the device is used in noisy environments,

through a switch. If unused, leave this pin open or connect it to

SS

to VSS; external debounce circuitry is

to VSS provides additional noise immunity).

2.3 V2IN second fixed voltage monitoring input

The V2IN input is the second fixed-voltage input for reset threshold monitoring. Available
fixed (customer-selectable, factory programmed) reset thresholds include 2.333 V to

1.050 V.

2.4 V

SS

This pin is the ground pin for the power supply.

2.5 V3IN, V4IN, and V5IN

The V3IN, V4IN and V5IN are high impedance inputs. 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
network.

2.6 RST active-low, open drain reset output

The reset output (RST) pin is driven low and stays low whenever VCC or V2IN, or V3IN, or
V4IN, or V5IN falls below its factory-trimmed or adjustable reset threshold or when MR
goes to logic low. It remains low for trec after all supply voltages being monitored rise above
their reset thresholds and MR
V

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

CC

goes from low to high. Connect an external pull-up resistor to

7/19

Pin descriptions STM6905

Figure 3. Functional block diagram

V

CC

V

RST1

COMPARE

V2IN

V3IN

V4IN

V5IN

MR

V

RST2

V

= 0.6V

REF

V

= 0.6V

REF

V

REF

V

CC

(1)

= 0.6V

COMPARE

COMPARE

COMPARE

COMPARE

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

Figure 4. Typical hardware hookup application diagram

From DC/DC Converter

V

=

(600mV)

TRIP

V =

(600mV)

TRIP

V =

(600mV)

TRIP

R1 + R2

(

R2

R3 + R4

(

R5 + R6

(

R6

R4

R1

R2

V

CC2

)

)

)

V

CC3

0.1 F

V

CC4

R3

R4

0.1 F

R5

R6

V

V

CC1

CC5

V

CC

V

IN2

VIN3

VIN4

VIN5

STM6905

V

SS

RST

MR

t

rec

Generator

ai13970

RST (To Processor Reset)

RST

Push-button

Switch

8/19

ai13973

STM6905 Operation

3 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/microprocessors.

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

(customer-selectable, factory-programmed ) and three adjustable monitor inputs. RST
output is open drain and requires a 10k ohms pull-up resistor tied to V

CC

.

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
formula.

6.0

VVTRIP

+

×=

R

) according to the following

REF

21

RR

2

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

On power up, the STM6905 activates a power on reset circuit which asserts the reset pin
(i.e. RST
and MR
that the supply voltage has stabilized to sufficient operating levels.

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

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

REC

)

thereby ensuring

REC

9/19

Voltage monitoring STM6905

4 Voltage monitoring

Figure 5. MR timing waveforms

t

MR

RST

MLMH

t

MLMR

t

REC

ai13974

Figure 6. Voltage monitoring diagram

V

,

VXIN

CC

V
V

RST1/2
RSTIN

,

RST

t

RD

t

rec

ai13975

10/19

STM6905 Maximum rating

5 Maximum rating

Stressing the device above the rating listed in the "Absolute maximum ratings" table may
cause permanent damage to the device. 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 implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability. Refer also to the STMicroelectronics SURE
Program and other relevant quality documents.

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

T

STG

T

SLD

V

IO

V

CC

I

O

θ

JA

1. 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).

Storage temperature (VCC off) -55 to +150 °C

(1)

Lead solder temperature for 10 seconds 260 °C

Input or output voltage -0.3 to VCC +0.3 V

Supply voltage -0.3 to 7.0 V

Output current 20 mA

Thermal resistance (junction to ambient) 146 °C/W

11/19

DC and AC parameters STM6905

6 DC and AC parameters

This section summarizes the operating measurement conditions and the DC and AC
characteristics of the device. Designers should check that the operating conditions in their
circuit match the operating conditions when relying on the quoted parameters.

Table 4. DC and AC characteristics

Sym

V

CC

I

CC

Alter-

native

Description Test condition

Operating voltage 0.8 5.5 V

V

< 5.5 V 12 16

VCC supply current

CC

= 3.3 V 11 15

V

CC

(1)

Min Typ Max Unit

I2IN V2IN supply curent V2IN = 3.3 V 3 5 µA

I

LI

(3)

I

LO

V

OL

Input leakage current -

(2)

)

(MR

Open drain RST output
leakage current

Output low voltage

; open drain)

(RST

VIN = V

V

CC

not asserted

RST

VCC ≥ 0.8V, I

≥ 1.0V, I

V

CC

V

≥ 1.2V, I

CC

≥ 2.7V, I

V

CC

≥ 4.5V, I

V

CC

or VSS -0.5 +0.5 µA

CC

> VRST;

= 1 µA 0.3 V

SINK

= 50 µA 0.3 V

SINK

= 100 µA 0.3 V

SINK

= 1.2 mA 0.3 V

SINK

= 3.2 mA 0.4 V

SINK

-0.5 +0.5 µA

25°C 3.047 3.078 3.109 V

T (falling)

-40°C to 85°C 3.023 3.133

V

RST1

(4)

V

TH1VCC

reset threshold

S (falling)

25°C 2.925 2.955 2.985 V

-40°C to 85°C 2.902 3.008

25°C 2.837 2.866 2.895 V

P (falling)

-40°C to 85°C 2.814 2.918

µA

Z (falling)

Y (falling)

(4)

V

RST2

V

V2IN reset threshold

TH2

W (falling)

G (falling)

F (falling)

12/19

25°C 2.310 2.333 2.356 V

-40°C to 85°C 2.291 2.375

25°C 2.166 2.188 2.210 V

-40°C to 85°C 2.149 2.227

25°C 1.666 1.683 1.700 V

-40°C to 85°C 1.653 1.713

25°C 1.099 1.110 1.121 V

-40°C to 85°C 1.090 1.130

25°C 1.040 1.050 1.061 V

-40°C to 85°C 1.031 1.069

STM6905 DC and AC parameters

Table 4. DC and AC characteristics (continued)

Sym

V

HYST

t

RD

Alter-

native

Description Test condition

Reset threshold

Referenced to V

hysteresis

V

= (V

CC

(V

VCC to RST delay

V2IN = (V

RST1

(V

t

REC

t

RST time-out period

RP

Adjustable reset comparator input (V3IN, V4IN, V5IN)

V

RSTIN

I

RSTIN

V3IN, V4IN, V5IN input
threshold

V3IN, V4IN, V5IN input
current

V3IN, V4IN, V5IN > 0.8 V –25 +25 nA

V3IN, V4IN, V5IN
hysteresis

t

RSTIND

V3IN, V4IN, V5IN to

output delay

RST

VRSTIN to (VRSTIN – 30 mV) 22 µs

typical

+ 100 mV) to

RST1

– 100 mV)

RST2

– 75 mV)

RST2

Option B

Option C

(1)

RST1/VRST2

+ 75 mV) to

(5)

(5)

Min Typ Max Unit

0.5 %

20 µs

20 µs

20 30 40 ms

80 120 180 ms

Option E 140 210 280 ms

Option F

(5)

280 420 560 ms

589 600 611 mV

3mV

Manual (push-button) reset input

V

IL

V

IH

t

MLMH

t

MLRL

1. Valid for ambient operating temperature: TA = –40°C to +85°C; VCC = 0.8 V to 5.5 V (except where noted).

2. 10k ohm (typ) internal pull-up resistor.

3. The leakage current measured on the RST

4. Other reset threshold voltages are offered. Minimum order quantities may apply. Contact local sales office for availability.

5. Other t

t

REC

MR input voltage

0.7 x V

CC

MR minimum pulse

t

MR

width

MR to RST output delay 200 ns

MRD

MR

glitch immunity 100 ns

pull-up resistance 10 kΩ

MR

pin is tested with the reset de-asserted (output high impedance).

time-out periods are offered. Minimum order quantities may apply. Contact local sales office for availability.

1µs

0.3 x V

CC

V

V

13/19

Package mechanical data STM6905

7 Package mechanical data

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

®

packages. These packages have a lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.

Figure 7. TSSOP8, 3 x 3mm, package mechanical outline

D

8

1

ccc

5

EE1

4

A2A

A1

L

L1

c

k

L2

eb

E3_ME

14/19

STM6905 Package mechanical data

Table 5. TSSOP 8-lead package mechanical data

mm inches

Symbol

Min Typ Max Min Typ Max

A 1.100 0.043

A1 0.00 0.15 0.000 0.006

A2 0.75 0.85 0.95 0.030 0.034 0.037

b 0.22 0.40 0.009 0.016

c 0.08 0.23 0.003 0.009

ccc 0.10 0.004

D 2.80 3.00 3.20 0.110 0.118 0.126

e 0.65 0.026

E 4.65 4.90 5.15 0.183 0.193 0.203

E1 2.80 3.00 3.10 0.110 0.118 0.122

L 0.40 0.60 0.80 0.016 0.024 0.032

L1 0.95 0.037

L2 0.25 0.010

k0

N8 8

° 46° 0° 46°

15/19

Part numbering STM6905

8 Part numbering

Table 6. Ordering information scheme

Example: STM6905 TZ E DS 6 F

Device type

STM6905

Reset threshold voltages

Suffix V

RST1

V

RST2

TZ 3.078 2.333

TW 3.078 1.683

TG 3.078 1.110

SY 2.955 1.050

SF 2.955 1.050

PW 2.866 1.683

t

REC

B = 30 ms

C = 120 ms

(1)

(1)

E = 210 ms

F = 420 ms

(1)

Package

DS = MSOP8 (TSSOP8)

(1)

Temperature range

6: -40°C to 85°C

Shipping method

E = ECOPACK

F = ECOPACK

1. Other reset threshold voltages and t
apply. Contact local sales office for availability.

®

package, tubes

®

package, tape & reel

time-out periods are offered. Minimum order quantities may

REC

16/19

STM6905 Package marking information

9 Package marking information

Table 7. Marking description

Part marking V

STM6905TZEDS6F 3.078 2.333 MSOP (TSSOP8) STZE

STM6905TWEDS6F 3.078 1.683 MSOP (TSSOP8) STWE

STM6905TGEDS6F 3.078 1.110 MSOP (TSSOP8) STGE

STM6905SYEDS6F 2.955 2.188 MSOP (TSSOP8) SSYE

STM6905SFEDS6F 2.955 1.050 MSOP (TSSOP8) SSFE

STM6905PWEDS6F 2.866 1.683 MSOP (TSSOP8) SPWE

(V) V

RST1

(V) Package Topside marking

RST2

17/19

Revision history STM6905

10 Revision history

Table 8. Document revision history

Date Revision Changes

19-Dec-2007 1 Initial release.

23-Jan-2008 2 Document status upgraded to full datasheet.

28-Jan-2008 3 Updated cover page, Figure 6, and Ta b l e 4.

18/19

STM6905

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19/19