STM6905
Quintuple, ultralow voltage supervisor with push-button reset
Datasheet - production data
• 600 mV internal reference
• RST output (open drain)
• Output guaranteed for VCC ≥ 0.8 V
• Reset delay time (TREC) on power-up: 210 ms
(typ)
MSOP8
(TSSOP8) (DS)
• 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)
Features
• 8-pin MSOP/TSSOP
• Operating temperature: –40 °C to 85 °C
(industrial grade)
• Quintuple voltage monitoring
• Accurate ±1.8 % across temperature voltage
threshold (±1 % at 25 °C)
Applications
• Primary supply (VCC) monitor. Fixed (factory programmed) reset thresholds: 3.078 V to
2.866 V
• Set-top boxes
• Multi-voltage systems
• Second fixed (V2IN) monitor. Fixed (factoryprogrammed) reset thresholds: 2.333 V to
1.050 V
• Cable/satellite applications
• Computer systems
• Data storage equipment
• Three additional adjustable supply monitor
inputs (externally adjustable)
Table 1. Device summary(1)
Order code
VRST1 (V)
STM6905TZEDS6F
STM6905TWEDS6F
VRST2 (V)
3.078
STM6905SYEDS6F
2.188
1.
210
MSOP8 (TSSOP8)
1.683
1.110
STM6905PWEDS6F
Package
2.333
STM6905TGEDS6F
STM6905SFEDS6F
tREC (ms)
2.955
2.866
1.050
1.683
Other reset threshold voltages and tREC time-out periods are offered. Contact local ST sales office for availability.
October 2014
This is information on a product in full production.
DocID14290 Rev 4
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www.st.com
Contents
STM6905
Contents
1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
2.1
Push-button reset input (MR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2
VCC primary supply voltage monitoring input . . . . . . . . . . . . . . . . . . . . . . . 7
2.3
V2IN second fixed voltage monitoring input . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4
VSS
2.5
V3IN, V4IN, and V5IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.6
RST active-low, open drain reset output . . . . . . . . . . . . . . . . . . . . . . . . . . 7
.....................................................................7
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1
Setting the adjustable voltage levels for V3IN, V4IN, and V5IN inputs . . . 9
3.2
Power on reset (tREC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Voltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9
Package marking information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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STM6905
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Signal names and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
TSSOP8 3 mm x 3 mm, package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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List of figures
STM6905
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
4/19
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
MSOP/TSSOP-8 connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical hardware hookup application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
MR timing waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Voltage monitoring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TSSOP8 3 mm x 3 mm, package mechanical outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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STM6905
1
Description
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). Two of the five supply
monitors (VCC and V2IN) have fixed (customer-selectable, factory-trimmed) thresholds
(VRST1 and VRST2). The other three voltage monitor inputs (V3IN, V4IN and V5IN) are
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 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 high. The reset
output logic state is valid for VCC greater than 0.8 V.
The STM6905 is available in a standard 8-lead MSOP (TSSOP) package.
Figure 1. Logic diagram
VCC
V2IN
V3IN
STM6905
V4IN
RST
V5IN
MR
VSS
ai13970
Figure 2. MSOP/TSSOP-8 connections
MR
1
8
RST
VCC
2
7
V5IN
V2IN
3
6
V4IN
VSS
4
5
V3IN
ai13971
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Description
STM6905
Table 2. Signal names and functions
6/19
Pin
Name
Type
1
MR
Input
2
VCC
Supply
3
V2IN
Input
4
VSS
Supply
5
V3IN
6
V4IN
7
V5IN
8
RST
Function
Active-low manual reset input with internal pull-up resistor
Primary supply voltage input and integrated fixed threshold undervoltage monitor
Second fixed threshold input monitor
Ground
Adjustable third reset comparator input
Input
Adjustable fourth reset comparator input
Adjustable fifth reset comparator input
Output
Active-low open-drain reset output (10 kΩ internal pull-up)
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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 the tREC after MR returns to high. The active-low input has an internal 10 kΩ pull-up
resistor to VCC. It can be driven from a TTL or CMOS logic line, or with open drain/collector
outputs, or connected to VSS through a switch. If unused, leave this pin open or connect it to
VCC.
Connect a normally open momentary switch from MR to VSS. An external debounce circuitry
is not required (if MR is driven from long cables or if the device is used in noisy
environments, connecting a 0.1 µF capacitor from MR to VSS provides additional noise
immunity).
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.
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
VSS
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 goes from low to high. Connect an external pull-up resistor to VCC.
A 10 kΩ pull-up resistor should be sufficient for most applications.
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Pin descriptions
STM6905
Figure 3. Functional block diagram
VCC
VRST1
COMPARE
VRST2
COMPARE
V2IN
V3IN
VREF = 0.6V
COMPARE
VREF = 0.6V
COMPARE
VREF = 0.6V
COMPARE
trec
Generator
RST
V4IN
V5IN
VCC
(1)
MR
ai13970
1. Internal pull-up on MR input of 10 kΩ (typ).
Figure 4. Typical hardware hookup application diagram
From DC/DC Converter
VCC2
V TRIP = (600mV)
VTRIP = (600mV)
V TRIP = (600mV)
( R1R2+ R2 )
( R3R4+ R4 )
( R5R6+ R6 )
VCC1
VCC
0.1 F
STM6905
VIN2
VCC3
0.1 F
RST
RST (To Processor Reset)
R1
VIN3
VCC4
R2
R3
MR
VIN4
Push-button
Switch
VCC5
R4
R5
VIN5
R6
VSS
ai13973
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STM6905
3
Operation
Operation
The STM6905 can monitor critical voltages such as power-supply and battery voltage
levels, while interfacing easily with the system controllers/microprocessors.
Figure 4 shows the typical hardware hookup for monitoring five voltages: two fixed
thresholds (customer-selectable, factory-programmed) and three adjustable monitor inputs.
The RST output is open drain and requires a 10 kΩ pull-up resistor tied to VCC.
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 (VREF) according to the following
formula.
R1 + R2
VTRIP = 0.6 V × ---------------------R2
During normal operation, the STM6905 monitors the voltage levels at all five pins (Vcc,
V2IN, V3IN, V4IN, and V5IN).
3.2
Power on reset (tREC)
On power up, the STM6905 activates a power-on reset circuit which asserts the reset pin
(i.e. RST goes low). The RST signal remains active until VCC (and V2IN, V3IN, V4IN, V5IN,
and MR) rises above the minimum voltage level for the time period tREC thereby ensuring
that the supply voltage has stabilized to sufficient operating levels.
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Voltage monitoring
4
STM6905
Voltage monitoring
Figure 5. MR timing waveforms
tMLMH
MR
tMLMR
RST
tREC
ai13974
Figure 6. Voltage monitoring diagram
VCC, VXIN
VRST1/2,
VRSTIN
tRD
trec
RST
ai13975
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5
Maximum rating
Maximum rating
Stressing the device above the ratings 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
TSTG
TSLD(1)
1.
Parameter
Storage temperature (VCC off)
Lead solder temperature for 10 seconds
Value
-55 to +150
260
Unit
°C
VIO
Input or output voltage
VCC
Supply voltage
-0.3 to 7.0
IO
Output current
20
mA
θJA
Thermal resistance (junction to ambient)
146
°C/W
-0.3 to VCC +0.3
V
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).
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DC and AC parameters
6
STM6905
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
Symbol
Alternative
Description
VCC
Operating voltage
ICC
VCC supply current
I2IN
V2IN supply current
ILI
ILO(3)
VTH1
5.5
V
16
VCC = 3.3 V
11
15
V2IN = 3.3 V
3
5
µA
VIN = VCC or VSS
-0.5
+0.5
Open drain RST output
leakage current
VCC > VRST,
RST not asserted
-0.5
+0.5
VCC ≥ 0.8 V, ISINK = 1 µA
0.3
VCC ≥ 1.0 V, ISINK = 50 µA
0.3
VCC ≥ 1.2 V, ISINK = 100 µA
0.3
VCC ≥ 2.7 V, ISINK = 1.2 mA
0.3
VCC ≥ 4.5 V, ISINK = 3.2 mA
0.4
VCC reset threshold
S (falling)
Y (falling)
V2IN reset threshold
W (falling)
G (falling)
F (falling)
12/19
Unit
12
Z (falling)
VTH2
Max
VCC < 5.5 V
P (falling)
VRST2(4)
Typ
0.8
T (falling)
VRST1(4)
Min
Input leakage current
(MR)(2)
Output low voltage
(RST, open drain)
VOL
Test condition(1)
25°C
3.047
-40 °C to 85 °C
3.023
25 °C
2.925
-40 °C to 85 °C
2.902
25 °C
2.837
-40 °C to 85 °C
2.814
25 °C
2.310
-40 °C to 85 °C
2.291
25 °C
2.166
-40 °C to 85 °C
2.149
25 °C
1.666
-40 °C to 85 °C
1.653
25 °C
1.099
-40 °C to 85 °C
1.090
25 °C
1.040
-40 °C to 85 °C
1.031
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3.078
3.109
3.133
2.955
2.985
3.008
2.866
2.895
2.918
2.333
2.356
2.375
2.188
2.210
2.227
1.683
1.700
1.713
1.110
1.121
1.130
1.050
1.061
1.069
V
STM6905
DC and AC parameters
Table 4. DC and AC characteristics (continued)
Symbol
Alternative
Reset threshold
hysteresis
VHYST
tRD
tREC
Description
VCC to RST delay
tRP
RST time-out period
Test condition(1)
Min
Typ
Referenced to VRST1/VRST2
typical
0.5
VCC = (VRST1 + 100 mV) to
(VRST1 – 100 mV)
20
V2IN = (VRST2 + 75 mV) to
(VRST2 – 75 mV)
20
Max
Unit
%
µs
Option B(5)
20
30
40
C(5)
80
120
180
Option E
140
210
280
Option F(5)
280
420
560
589
600
611
mV
+25
nA
Option
ms
Adjustable reset comparator input (V3IN, V4IN, V5IN)
VRSTIN
V3IN, V4IN, V5IN input
threshold
IRSTIN
V3IN, V4IN, V5IN input
current
V3IN, V4IN, V5IN > 0.8 V
–25
V3IN, V4IN, V5IN
hysteresis
V3IN, V4IN, V5IN to
RST output delay
tRSTIND
VRSTIN to (VRSTIN – 30 mV)
3
mV
22
µs
Manual (push-button) reset input
VIL
0.3 x VCC
MR input voltage
VIH
V
0.7 x VCC
tMLMH
tMR
MR minimum pulse
width
tMLRL
tMRD
MR to RST output delay
200
MR glitch immunity
100
MR pull-up resistance
10
1
µs
ns
kΩ
1. Valid for ambient operating temperature: TA = –40 °C to +85 °C; VCC = 0.8 V to 5.5 V (except where noted).
2. 10 kΩ (typ) internal pull-up resistor.
3.
The leakage current measured on the RST pin is tested with the reset de-asserted (output high impedance).
4. Other reset threshold voltages are offered. Minimum order quantities may apply. Contact local sales office for availability.
5. Other tREC time-out periods are offered. Minimum order quantities may apply. Contact local sales office for availability.
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Package information
7
STM6905
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
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STM6905
Package information
Figure 7. TSSOP8 3 mm x 3 mm, package mechanical outline
D
8
5
c
E1
1
E
4
k
A1
A
L
L2
A2
L1
ccc
b
e
E3_ME
Table 5. TSSOP8 3 mm x 3 mm, package mechanical data
mm
inches
Symbol
Min
Typ
A
Min
Typ
1.100
A1
0.00
A2
0.75
b
c
Max
0.043
0.15
0.000
0.95
0.030
0.22
0.40
0.009
0.016
0.08
0.23
0.003
0.009
0.85
ccc
D
Max
0.006
0.034
0.10
2.80
e
3.00
3.20
0.037
0.004
0.110
0.65
0.118
0.126
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
k
N
0°
4
6°
8
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8
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Part numbering
8
STM6905
Part numbering
Table 6. Ordering information scheme
Example:
STM6905
TZ
E
DS
6
Device type
STM6905
Reset threshold voltages(1)
Suffix
VRST1
VRST2
TZ
3.078
2.333
TW
3.078
1.683
TG
3.078
1.110
SY
2.955
2.188
SF
2.955
1.050
PW
2.866
1.683
tREC
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 and reel
1. Other reset threshold voltages and tREC time-out periods are offered. Minimum order quantities may
apply. Contact local sales office for availability.
16/19
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STM6905
9
Package marking information
Package marking information
Table 7. Marking description
Part marking
VRST1 (V)
STM6905TZEDS6F
STM6905TWEDS6F
3.078
STM6905TGEDS6F
STM6905SYEDS6F
STM6905SFEDS6F
STM6905PWEDS6F
VRST2 (V)
2.866
Topside marking
2.333
STZE
1.683
STWE
1.110
2.955
Package
2.188
MSOP (TSSOP8)
STGE
SSYE
1.050
SSFE
1.683
SPWE
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Revision history
10
STM6905
Revision history
Table 8. Document revision history
18/19
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 Table 4.
20-Oct-2014
4
Small text changes to English
Table 1: updated footnote 1
Table 6: updated the reset threshold voltage of “SY” (VRST2)
DocID14290 Rev 4
STM6905
IMPORTANT NOTICE – PLEASE READ CAREFULLY
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improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on
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acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or
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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2014 STMicroelectronics – All rights reserved
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