Features
■ Quad voltage monitoring
■ Accurate ±1.8% across temperature voltage
threshold (±1% at 25 °C)
■ Primary supply (V
programmed) reset thresholds: 3.078
to 2.188 V
■ Second fixed (V2IN) monitor. Fixed (factory-
programmed) reset thresholds: 2.333
to 1.110 V
■ Two additional adjustable supply monitor
inputs (externally adjustable)
■ 0.6 V internal reference
■ RST output (open drain)
■ Output guaranteed for V
■ Reset delay time (t
■ Manual reset input (MR)
■ Low supply current of 12 µA (typ)
■ Power supply voltage 0.8 to 5.5 V
■ RoHS compliant (green package)
■ 8-pin MSOP/TSSOP
■ Operating temperature: –40 to 85 °C (industrial
grade)
Table 1. Device summary
) monitor. Fixed (factory -
CC
≥ 0.8 V
CC
) pin selectable
REC
(1)
STM6904
Quad, ultralow voltage supervisor
with push-button reset
MSOP8
(TSSOP8) (DS)
Applications
■ Set-top boxes
■ Multi-voltage systems
■ Cable/satellite applications
■ Computer systems
■ Data storage equipment
Order code V
(V) V
RST1
(V) t
RST2
(ms) Package
REC
STM6904TZEDS6F 3.078 2.333 210 MSOP8(TSSOP8)
STM6904TWEDS6F 3.078 1.683 210 MSOP8(TSSOP8)
STM6904TGEDS6F 3.078 1.110 210 MSOP8(TSSOP8)
STM6904SYEDS6F 2.955 2.188 210 MSOP8(TSSOP8)
STM6904SFEDS6F 2.955 1.050 210 MSOP8(TSSOP8)
STM6904PWEDS6F 2.866 1.683 210 MSOP8(TSSOP8)
1. Other reset threshold voltages and t
ST sales office for availability.
timeout periods are offered. Minimum order quantities may apply. Contact local
REC
December 2011 Doc ID 14289 Rev 3 1/20
www.st.com
1
Contents STM6904
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 and V4IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.6 RST
2.7 TR
primary supply voltage monitoring input . . . . . . . . . . . . . . . . . . . . . . . 7
CC
SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
active-low, open drain reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SEL
3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Setting the adjustable voltage levels for V3IN and V4IN 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9 Package marking information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20 Doc ID 14289 Rev 3
STM6904 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 7. Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 8. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Doc ID 14289 Rev 3 3/20
List of figures STM6904
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
timing waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4/20 Doc ID 14289 Rev 3
STM6904 Description
1 Description
The STM6904 supervisor is a low voltage/low supply current processor supervisor,
designed to monitor up to four 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 two voltage monitor inputs (V3IN and V4IN) are monitored
RST2
). Two of the four supply
using externally adjustable threshold (0.600 V internal reference) to meet specific level
requirements.
If any of the four monitored voltages drops below its factory-trimmed or adjustable
thresholds, or if the MR
low). Once asserted, RST is maintained low for a minimum delay period (t
is asserted to logic low, the reset output RST is asserted (driven
) after ALL
REC
monitored supplies rise above their respective thresholds and MR returns to high. This
device is in the correct reset output logic state when V
greater than 0.8 V.
CC
The STM6904 is available in a standard 8-lead MSOP (TSSOP) package.
Figure 1. Logic diagram
V
CC
V2IN
V3IN
V4IN
TR
MR
SEL
STM6904
V
SS
RST
ai13976
Figure 2. MSOP/TSSOP-8 connections
MR
V
CC
V2IN
V
SS
Doc ID 14289 Rev 3 5/20
1
2
3
4
RST
8
TR
7
6
5
SEL
V4IN
V3IN
ai13977
Description STM6904
Table 2. Signal names and functions
Pin Name Type Function
1MR
2V
CC
Input Active-low manual reset input with internal pull-up resistor
Supply
Primary supply voltage input and integrated fixed threshold undervoltage monitor
3 V2IN Input Second fixed threshold input monitor
4V
SS
Supply Ground
5 V3IN Input Adjustable third reset comparator input
6 V4IN Input Adjustable fourth reset comparator input
7TR
SEL
8RST
Controls selectable t
Input
If pin is tied high (V
If pin is tied low (V
Note: Pin must be tied to V
Output Active-low open drain reset output (10 kΩ internal pull-up)
SS
CC
REC
), t
), t
. Two t
REC
= 420 ms
REC
= 210 ms
REC
or VSS (do not float)
CC
options available.
6/20 Doc ID 14289 Rev 3
STM6904 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
to V
or connected to V
Connect a normally open momentary switch from MR
not required. (If MR
connecting a 0.1 μF 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 to 2.866 V.
2.3 V2IN second fixed voltage monitoring input
after MR returns to high. The active-low input has an internal 10 kΩ pull-up resistor
REC
. It can be driven from a TTL or CMOS logic line, or with open drain/collector outputs,
CC
through a switch. If unused, leave this pin open or connect it to VCC.
SS
to VSS; external debounce circuitry is
is driven from long cables or if the device is used in noisy environments,
to VSS provides additional noise immunity).
The V2IN input is the second fixed-voltage input for reset threshold monitoring. Available
fixed (customer-selectable, factory programmed) reset thresholds include 2.333 to
1.050 V.
2.4 V
SS
This pin is the ground pin for the power supply.
2.5 V3IN and V4IN
The V3IN and V4IN are high impedance inputs. RST is driven low when the voltage (V
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 falls below its factory-trimmed or adjustable reset threshold or when MR
low. It remains low for t
thresholds and MR
A 10 kΩ pull-up resistor should be sufficient for most applications.
goes from low to high. Connect an external pull-up resistor to VCC.
after all supply voltages being monitored rise above their reset
REC
TRIP
goes to logic
)
2.7 TR
Allows user to select between two values of t
V
SS
input
SEL
(210 ms) or VCC (420 ms).
timing (210 or 420 ms). Pin must be tied to
REC
Doc ID 14289 Rev 3 7/20
Pin descriptions STM6904
Figure 3. Functional block diagram
6
##
6
234
#/-0!2%
6).
6
234
#/-0!2%
6).
6
2%&
6
#/-0!2%
6).
6
##
2%&
6
#/-
0!2%
6
-2
42
3%,
1. Internal pull-up on MR input of 10 kΩ (typ.).
Figure 4. Typical hardware hookup application diagram
&ROM$#$#CONVERTER
6
6
42)0
42)0
M6
M6
22
2
22
2
6
##
&
6
##
6
##
34-
T
2%#
GENE
RATOR
234
AI6
6
).
6
##
&
2
6).
6
2
##
2
6).
6
##
= 210 ms).
REC
42
3%,
1. TR
must be tied to VCC (t
SEL
2
= 420 ms) or to VSS (t
REC
8/20 Doc ID 14289 Rev 3
234
234TOPROCESSORRESET
-2
0USHBUTTON
SWITCH
6
33
AI6
STM6904 Operation
3 Operation
The STM6904 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 four voltages; two fixed thresholds
(customer-selectable, factory-programmed) and two adjustable monitor inputs. RST
is open drain and requires a 10 kΩ pull-up resistor tied to V
CC
.
3.1 Setting the adjustable voltage levels for V3IN and V4IN inputs
The user can customize the minimum voltage levels for the two adjustable voltage inputs by
connecting an external resistor divider network to the V3IN and V4IN pins in order to set the
trip point at some voltage above the 600 mv (V
V
TRIP
0.6V
) according to the following formula:
REF
R1 R2+
------------- ---------
×=
R2
output
During normal operation, the STM6904 monitors the voltage levels at all four pins (V
V2IN, V3IN, and V4IN).
3.2 Power on reset (t
On power up, the STM6904 activates a power on reset circuit which asserts the reset pin
(i.e. RST
MR)
the supply voltage has stabilized to sufficient operating levels.
goes low). The RST signal remains active until VCC (and V2IN, V3IN, V4IN and
rises above the minimum voltage level for the time period t
REC
,
CC
)
thereby ensuring that
REC
Doc ID 14289 Rev 3 9/20
Voltage monitoring STM6904
4 Voltage monitoring
Figure 5. MR timing waveforms
t
6X).
MLMH
t
MLMR
t
REC
ai13974
MR
RST
Figure 6. Voltage monitoring diagram
6
##
234
6
234
6
234).
T
2$
T
2%#
AI6
10/20 Doc ID 14289 Rev 3
STM6904 Maximum rating
5 Maximum rating
Stressing the device above the rating listed in Table 3: Absolute maximum ratings 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 Section 6: DC and AC
parameters 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 to 260 °C for < 30 seconds (total thermal budget not to exceed
180 °C for betw een 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
Doc ID 14289 Rev 3 11/20
DC and AC parameters STM6904
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
CC
CC
Alter-
native
Description Test condition
(1)
Min. Typ. Max. Unit
Operating voltage 0.8 5.5 V
< 5.5 V 10 14
V
VCC supply current
CC
V
= 3.3 V 9 13
CC
Sym-
bol
V
I
I2IN V2IN supply current V2IN = 3.3 V 3 5 µA
Input leakage current -
(2)
(MR
I
LI
(3)
I
LO
)
Input leakage current (TR
)
SEL
Open drain RST output
leakage current
V
V
V
OL
Output low voltage
; open drain)
(RST
V
V
V
V
RST
≥ 0.8 V, I
CC
≥ 1.0 V, I
CC
≥ 1.2 V, I
CC
≥ 2.7 V, I
CC
≥ 4.5 V, I
CC
VIN = V
= V
IN
SS
> V
V
CC
not asserted
SINK
SINK
SINK
SINK
SINK
SS
or V
RST
;
CC
-0.5 +0.5 µA
-0.5 +0.5 µA
500 800 µA
= 1 µA 0.3 V
= 50 µA 0.3 V
= 100 µA 0.3 V
= 1.2 mA 0.3 V
= 3.2 mA 0.4 V
25 °C 3.047 3.078 3.109 V
T (falling)
-40 to 85 °C 3.023 3.133
µA
V
RST1
(4)
V
TH1VCC
reset threshold
S (falling)
25 °C 2.925 2.955 2.985 V
-40 to 85 °C 2.902 3.008
25 °C 2.837 2.866 2.895 V
P (falling)
-40 to 85 °C 2.814 2.918
12/20 Doc ID 14289 Rev 3
STM6904 DC and AC parameters
Table 4. DC and AC characteristics (continued)
Sym-
V
RST2
V
t
REC
bol
HYST
t
RD
(5)
(4)
Alter-
native
V
TH2
t
RP
Description Test condition
Z (falling)
Y (falling)
V2IN reset threshold
W (falling)
G (falling)
F (falling)
Reset threshold
Referenced to V
hysteresis
= (V
V
CC
VCC to RST delay
V2IN = (V
TR
RST timeout period
TR
(1)
Min. Typ. Max. Unit
25 °C 2.310 2.333 2.356
-40 to 85 °C 2.291 2.375
25 °C 2.166 2.188 2.210
-40 to 85 °C 2.149 2.227
25 °C 1.666 1.683 1.700
-40 to 85 °C 1.653 1.713
25 °C 1.099 1.110 1.121
-40 to 85 °C 1.090 1.130
25 °C 1.040 1.050 1.061
-40 to 85 °C 1.031 1.069
RST1/VRST2
typical
+ 100 mV) to
RST1
– 100 mV)
(V
RST1
+ 75 mV) to
RST2
– 75 mV)
(V
RST2
= LOW (VSS) 140 210 280 ms
SEL
= HIGH (VCC) 280 420 560 ms
SEL
0.5 %
20 µs
20 µs
V
V
V
V
V
Adjustable reset comparator input (V3IN and V4IN)
V
RSTIN
I3IN,
I4IN
V3IN, V4IN input
threshold
V3IN, V4IN input current V3IN, V4IN > 0.8 V -25 +25 nA
V3IN, V4IN hysteresis 3 mV
t
RSTIND
V3IN, V4IN to RST output
delay
V
RSTIN
Manual (push-button) reset input
V
IL
V
IH
t
MLMH
t
MLRLtMRD
MR input voltage
t
MR minimum pulse width 1 µs
MR
MR to RST output delay 200 ns
to (V
589 600 611 mV
– 30 mV) 22 µs
RSTIN
0.3 x V
0.7 x V
CC
CC
V
V
Doc ID 14289 Rev 3 13/20
DC and AC parameters STM6904
Table 4. DC and AC characteristics (continued)
Sym-
bol
Alter-
native
Description Test condition
(1)
Min. Typ. Max. Unit
MR glitch immunity 100 ns
pull-up resistance 10 kΩ
MR
1. Valid for ambient operating temperature: TA = –40 to +85 °C; VCC = 0.8 to 5.5 V (except where noted).
2. 10 kΩ (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
timeout periods are offered. Minimum order quantities may apply. Contact local sales office for availability.
REC
pin is tested with the reset de-asserted (output high impedance).
14/20 Doc ID 14289 Rev 3
STM6904 Package mechanical data
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
Figure 7. TSSOP8, 3 x 3mm, package mechanical outline
D
8
1
ccc
5
EE1
4
A2A
A1
eb
L
L1
E3_ME
c
k
L2
Doc ID 14289 Rev 3 15/20
Package mechanical data STM6904
Table 5. TSSOP 8-lead package mechanical data
mm inches
Symbol
Min. Typ. Max. Min. Typ. Max.
A 1.10 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°46°0° 4 6°
N8 8
16/20 Doc ID 14289 Rev 3
STM6904 Part numbering
8 Part numbering
Table 6. Ordering information scheme
Example: STM6904 TZ E DS 6 F
Device type
STM6904
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 2.188
SF 2.955 1.050
PW 2.866 1.683
(1)
t
REC
E = 210 or 420 ms
Package
DS = MSOP8 (TSSOP8)
Temperature range
6: -40 to 85 °C
(1)
Shipping method
E = ECOPACK
F = ECOPACK
1. Other reset threshold voltages and t
Contact local sales office for availability.
®
package, tubes
®
package, tape and reel
timeout periods are offered. Minimum order quantities may apply.
REC
Doc ID 14289 Rev 3 17/20
Package marking information STM6904
9 Package marking information
Table 7. Marking description
Part marking V
(V) V
RST1
(V) Package Topside marking
RST2
STM6904TZEDS6F 3.078 2.333 MSOP (TSSOP8) STZ4
STM6904TWEDS6F 3.078 1.683 MSOP (TSSOP8) STW4
STM6904TGEDS6F 3.078 1.110 MSOP (TSSOP8) STG4
STM6904SFEDS6F 2.955 1.050 MSOP (TSSOP8) SSF4
STM6904SYEDS6F 2.955 2.188 MSOP (TSSOP8) SSY4
STM6904PWEDS6F 2.866 1.683 MSOP (TSSOP8) SPW4
18/20 Doc ID 14289 Rev 3
STM6904 Revision history
10 Revision history
Table 8. Document revision history
Date Revision Changes
19-Dec-2007 1 Initial release.
28-Jan-2008 2 Updated cover page, Figure 6 and Tab le 4 .
16-Dec-2011 3
Removed label “Preliminary Data”, document reformatted, minor text
corrections throughout document, updated Section 6, ECOPACK
and Disclaimer.
®
Doc ID 14289 Rev 3 19/20
STM6904
y
Please Read Carefully:
Informatio n in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at an
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
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20/20 Doc ID 14289 Rev 3
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