STMICROELECTRONICS STM6905TZEDS6F

STM6905
Quintuple, ultralow voltage supervisor
with push-button reset
Features
■
Quintuple voltage monitoring
■
Accurate ±1.8% across temperature voltage
threshold (±1% at 25°C)
■
Primary supply (VCC) monitor. Fixed (factory programmed) reset thresholds: 3.078 V to
2.866 V
■
Second fixed (V2IN) monitor. Fixed (factoryprogrammed) 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 VCC ≥ 0.8 V
■
Reset delay time (trec) on power-up: 210 ms
(typ)
■
Manual reset input (MR)
■
Low supply current of 12 µA (typ)
■
Set-top boxes
■
Power supply voltage 0.8 V to 5.5 V
■
Multi-voltage systems
■
RoHS compliant (green package)
■
Cable/satellite applications
■
8-pin MSOP/TSSOP
■
Computer systems
■
Operating temperature: –40°C to 85°C
(industrial grade)
■
Data storage equipment
Table 1.
MSOP8
(TSSOP8) (DS)
Applications
Device summary(1)
Order code
VRST1 (V)
VRST2 (V)
tREC (ms)
Package
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 tREC time-out periods are offered. Minimum order quantities may apply. Contact local
ST sales office for availability.
January 2008
Rev 3
1/19
www.st.com
1
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 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.
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
TSSOP 8-lead package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3/19
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 x 3mm, package mechanical outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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. 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
Figure 2.
ai13970
MSOP/TSSOP-8 connections
MR
1
8
RST
VCC
2
7
V5IN
V2IN
3
6
V4IN
VSS
4
5
V3IN
ai13971
5/19
Description
STM6905
Table 2.
6/19
Signal names and functions
Pin
Name
Type
Function
1
MR
Input
2
VCC
Supply
3
V2IN
Input
4
VSS
Supply
5
V3IN
Input
Adjustable third reset comparator input
6
V4IN
Input
Adjustable fourth reset comparator input
7
V5IN
Input
Adjustable fifth reset comparator input
8
RST
Output
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
Active-low open-drain reset output (10k ohm internal pull-up)
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 tREC after MR returns to high. The active-low input has an internal 10k ohm 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; external debounce circuitry is
not required. (If MR is driven from long cables or if the device is used in noisy environments,
connecting a 0.1uF 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 10k ohms pull-up resistor should be sufficient for most applications.
7/19
Pin descriptions
Figure 3.
STM6905
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 10k ohm (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
8/19
STM6905
3
Operation
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 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.
VTRIP = 0.6 V ×
R1 + R2
R2
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 (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.
9/19
Voltage monitoring
STM6905
4
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
10/19
STM6905
5
Maximum rating
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
TSTG
TSLD(1)
1.
Parameter
Storage temperature (VCC off)
Lead solder temperature for 10 seconds
Value
Unit
-55 to +150
°C
260
°C
-0.3 to VCC +0.3
V
VIO
Input or output voltage
VCC
Supply voltage
-0.3 to 7.0
V
IO
Output current
20
mA
θJA
Thermal resistance (junction to ambient)
146
°C/W
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
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.
Sym
DC and AC characteristics
Alternative
Description
VCC
Operating voltage
ICC
VCC supply current
I2IN
V2IN supply curent
Test condition(1)
Min
Typ
0.8
Max
Unit
5.5
V
VCC < 5.5 V
12
16
VCC = 3.3 V
11
15
V2IN = 3.3 V
3
5
µA
µA
ILI
Input leakage current (MR)(2)
VIN = VCC or VSS
-0.5
+0.5
µA
ILO(3)
Open drain RST output
leakage current
VCC > VRST;
RST not asserted
-0.5
+0.5
µA
VCC ≥ 0.8V, ISINK = 1 µA
0.3
V
VCC ≥ 1.0V, ISINK = 50 µA
0.3
V
VCC ≥ 1.2V, ISINK = 100 µA
0.3
V
VCC ≥ 2.7V, ISINK = 1.2 mA
0.3
V
VCC ≥ 4.5V, ISINK = 3.2 mA
0.4
V
3.109
V
Output low voltage
(RST; open drain)
VOL
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
3.078
T (falling)
VRST1(4)
VTH1
VCC reset threshold
3.133
2.955
2.985
V
S (falling)
3.008
2.866
2.895
V
P (falling)
2.918
2.333
2.356
V
Z (falling)
2.375
2.188
2.210
V
Y (falling)
VRST2(4)
VTH2
V2IN reset threshold
2.227
1.683
1.700
V
W (falling)
1.713
1.110
1.121
V
G (falling)
1.130
1.050
1.061
F (falling)
12/19
1.069
V
STM6905
Table 4.
Sym
DC and AC parameters
DC and AC characteristics (continued)
Alternative
Description
Reset threshold
hysteresis
VHYST
VCC to RST delay
tRD
Test condition(1)
tRP
Typ
Max
Unit
Referenced to VRST1/VRST2
typical
0.5
%
VCC = (VRST1 + 100 mV) to
(VRST1 – 100 mV)
20
µs
V2IN = (VRST2 + 75 mV) to
(VRST2 – 75 mV)
20
µs
Option B(5)
20
30
40
ms
(5)
80
120
180
ms
140
210
280
ms
280
420
560
ms
589
600
611
mV
+25
nA
Option C
tREC
Min
RST time-out period
Option E
Option
F(5)
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
V
1
µs
tMLMH
tMR
MR minimum pulse
width
tMLRL
tMRD
MR to RST output delay
200
ns
MR glitch immunity
100
ns
MR pull-up resistance
10
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. 10k ohm (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.
13/19
Package mechanical data
7
STM6905
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
5
c
E1
1
E
4
k
A1
A
L
L2
A2
L1
ccc
b
e
E3_ME
14/19
STM6905
Package mechanical data
Table 5.
TSSOP 8-lead 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
8
6°
0°
4
6°
8
15/19
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
1.050
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 & 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
F
STM6905
Package marking information
9
Package marking information
Table 7.
Marking description
Part marking
VRST1 (V)
VRST2 (V)
Package
Topside marking
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
17/19
Revision history
10
STM6905
Revision history
Table 8.
18/19
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 Table 4.
STM6905
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