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STM6905
Quintuple, ultralow voltage supervisor with push-button reset
Features

Quintuple voltage monitoring Accurate 1.8% across temperature voltage threshold (1% at 25C) 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 A (typ) Power supply voltage 0.8 V to 5.5 V RoHS compliant (green package) 8-pin MSOP/TSSOP Operating temperature: -40C to 85C (industrial grade) Device summary(1)
VRST1 (V) 3.078 3.078 3.078 2.955 2.955 2.866 VRST2 (V) 2.333 1.683 1.110 2.188 1.050 1.683 tREC (ms) 210 210 210 210 210 210 Package MSOP8(TSSOP8) MSOP8(TSSOP8) MSOP8(TSSOP8) MSOP8(TSSOP8) MSOP8(TSSOP8) MSOP8(TSSOP8) MSOP8 (TSSOP8) (DS)

Applications

Set-top boxes Multi-voltage systems Cable/satellite applications Computer systems Data storage equipment
Table 1.
Order code STM6905TZEDS6F STM6905TWEDS6F STM6905TGEDS6F STM6905SYEDS6F STM6905SFEDS6F STM6905PWEDS6F
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 2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 2.2 2.3 2.4 2.5 2.6 Push-button reset input (MR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 VCC primary supply voltage monitoring input . . . . . . . . . . . . . . . . . . . . . . . 7 V2IN second fixed voltage monitoring input . . . . . . . . . . . . . . . . . . . . . . . . 7 VSS
.....................................................................7
V3IN, V4IN, and V5IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 RST active-low, open drain reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 3.2 Setting the adjustable voltage levels for V3IN, V4IN, and V5IN inputs . . . . 9 Power on reset (tREC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 5 6 7 8 9 10
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
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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 TSSOP 8-lead 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. 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
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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). 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 V4IN V5IN MR STM6905 RST
VSS
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Figure 2.
MSOP/TSSOP-8 connections
MR VCC V2IN VSS
1 2 3 4
8 7 6 5
RST V5IN V4IN V3IN
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Description
STM6905
Table 2.
Pin 1 2 3 4 5 6 7 8
Signal names and functions
Name MR VCC V2IN VSS V3IN V4IN V5IN RST Type Input Supply Input Supply Input Input Input Output 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 Adjustable fourth reset comparator input Adjustable fifth reset comparator input Active-low open-drain reset output (10k ohm internal pull-up)
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STM6905
Pin descriptions
2
2.1
Pin descriptions
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. Functional block diagram
VCC VRST1
V2IN
STM6905
COMPARE
VRST2
V3IN
COMPARE
VREF = 0.6V
V4IN
COMPARE
trec Generator
RST
VREF = 0.6V
V5IN
COMPARE
VCC (1) MR
VREF = 0.6V
COMPARE
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) + ( R1R2R2 ) + ( R3R4R4 ) + ( R5R6R6 ) VCC3 0.1 F R1 VIN3 R2 R3 VIN4 R4 R5 VIN5 R6 VSS VCC5 MR Push-button Switch VCC4 RST RST (To Processor Reset) VCC1 VCC 0.1 F STM6905 VIN2
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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 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 x
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.
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Voltage monitoring
STM6905
4
Voltage monitoring
Figure 5.
MR timing waveforms
tMLMH MR tMLMR RST tREC
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Figure 6.
Voltage monitoring diagram
VCC, VXIN VRST1/2, VRSTIN RST tRD
trec
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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.
Symbol TSTG TSLD(1) VIO VCC IO JA
1.
Absolute maximum ratings
Parameter Storage temperature (VCC off) Lead solder temperature for 10 seconds Input or output voltage Supply voltage Output current Thermal resistance (junction to ambient) Value -55 to +150 260 -0.3 to VCC +0.3 -0.3 to 7.0 20 146 Unit C C V V mA C/W
Reflow at peak temperature of 255C to 260C for < 30 seconds (total thermal budget not to exceed 180C for between 90 to 150 seconds).
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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.
Sym VCC ICC I2IN ILI ILO(3)
DC and AC characteristics
Alternative Description Operating voltage VCC supply current V2IN supply curent Input leakage current (MR)(2) Open drain RST output leakage current VCC < 5.5 V VCC = 3.3 V V2IN = 3.3 V VIN = VCC or VSS VCC > VRST; RST not asserted VCC 0.8V, ISINK = 1 A VCC 1.0V, ISINK = 50 A Output low voltage (RST; open drain) VCC 1.2V, ISINK = 100 A VCC 2.7V, ISINK = 1.2 mA VCC 4.5V, ISINK = 3.2 mA 25C T (falling) -40C to 85C 3.023 2.925 2.902 2.837 2.814 2.310 2.291 2.166 2.149 1.666 1.653 1.099 1.090 1.040 1.031 1.050 1.110 1.683 2.188 2.333 2.866 2.955 3.133 2.985 3.008 2.895 2.918 2.356 2.375 2.210 2.227 1.700 1.713 1.121 1.130 1.061 1.069 V V V V V V V 25C VTH1 VCC reset threshold S (falling) -40C to 85C 25C P (falling) -40C to 85C 25C Z (falling) -40C to 85C 25C Y (falling) -40C to 85C 25C VTH2 V2IN reset threshold W (falling) -40C to 85C 25C G (falling) -40C to 85C 25C F (falling) -40C to 85C 3.047 3.078 -0.5 -0.5 Test condition(1) Min 0.8 12 11 3 Typ Max 5.5 16 A 15 5 +0.5 +0.5 0.3 0.3 0.3 0.3 0.4 3.109 A A A V V V V V V Unit V
VOL
VRST1(4)
VRST2(4)
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STM6905 Table 4.
Sym
DC and AC parameters DC and AC characteristics (continued)
Alternative Description Reset threshold hysteresis Test condition(1) Referenced to VRST1/VRST2 typical VCC = (VRST1 + 100 mV) to (VRST1 - 100 mV) V2IN = (VRST2 + 75 mV) to (VRST2 - 75 mV) Option B(5) Option C
(5)
Min
Typ
Max
Unit
VHYST
0.5 20 20 20 80 140 280 30 120 210 420 40 180 280 560
% s s ms ms ms ms
tRD
VCC to RST delay
tREC
tRP
RST time-out period Option E Option F(5)
Adjustable reset comparator input (V3IN, V4IN, V5IN) VRSTIN IRSTIN V3IN, V4IN, V5IN input threshold V3IN, V4IN, V5IN input current V3IN, V4IN, V5IN hysteresis tRSTIND V3IN, V4IN, V5IN to RST output delay VRSTIN to (VRSTIN - 30 mV) V3IN, V4IN, V5IN > 0.8 V 589 -25 3 22 600 611 +25 mV nA mV s
Manual (push-button) reset input VIL VIH tMLMH tMLRL tMR tMRD MR minimum pulse width MR to RST output delay MR glitch immunity MR pull-up resistance MR input voltage 0.7 x VCC 1 200 100 10 0.3 x VCC V V s ns ns k
1. Valid for ambient operating temperature: TA = -40C to +85C; 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
STM6905
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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 E1 E
c
1
4
k
A1 A ccc b e A2
L L1
L2
E3_ME
14/19
STM6905
Package mechanical data
Table 5.
Symbol
TSSOP 8-lead package mechanical data
mm Min Typ Max 1.100 0.00 0.75 0.22 0.08 0.85 0.15 0.95 0.40 0.23 0.10 2.80 3.00 0.65 4.65 2.80 0.40 4.90 3.00 0.60 0.95 0.25 0 4 8 6 0 5.15 3.10 0.80 0.183 0.110 0.016 3.20 0.110 0.118 0.026 0.193 0.118 0.024 0.037 0.010 4 8 6 0.203 0.122 0.032 0.000 0.030 0.009 0.003 0.034 Min inches Typ Max 0.043 0.006 0.037 0.016 0.009 0.004 0.126
A A1 A2 b c ccc D e E E1 L L1 L2 k N
15/19
Part numbering
STM6905
8
Part numbering
Table 6.
Example:
Ordering information scheme
STM6905 TZ E DS 6 F
Device type STM6905
Reset threshold voltages(1) Suffix TZ TW TG SY SF PW VRST1 3.078 3.078 3.078 2.955 2.955 2.866 VRST2 2.333 1.683 1.110 1.050 1.050 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: -40C to 85C
Shipping method E = ECOPACK(R) package, tubes F = ECOPACK(R) 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
STM6905
Package marking information
9
Table 7.
Package marking information
Marking description
VRST1 (V) 3.078 3.078 3.078 2.955 2.955 2.866 VRST2 (V) 2.333 1.683 1.110 2.188 1.050 1.683 Package MSOP (TSSOP8) MSOP (TSSOP8) MSOP (TSSOP8) MSOP (TSSOP8) MSOP (TSSOP8) MSOP (TSSOP8) Topside marking STZE STWE STGE SSYE SSFE SPWE
Part marking STM6905TZEDS6F STM6905TWEDS6F STM6905TGEDS6F STM6905SYEDS6F STM6905SFEDS6F STM6905PWEDS6F
17/19
Revision history
STM6905
10
Revision history
Table 8.
Date 19-Dec-2007 23-Jan-2008 28-Jan-2008
Document revision history
Revision 1 2 3 Initial release. Document status upgraded to full datasheet. Updated cover page, Figure 6, and Table 4. Changes
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STM6905
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19/19

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