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STM6904
Quad, ultralow voltage supervisor with push-button reset
Preliminary Data
Features

Quad 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 2.188 V Second fixed (V2IN) monitor. Fixed (factoryprogrammed) reset thresholds: 2.333 V to 1.110 V Two additional adjustable supply monitor inputs (externally adjustable) 0.6V internal reference RST output (open drain) Output guaranteed for VCC 0.8 V Reset delay time (trec) pin selectable 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 STM6904TZEDS6F STM6904TWEDS6F STM6904TGEDS6F STM6904SYEDS6F STM6904SFEDS6F STM6904PWEDS6F
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 2
1/21
www.st.com 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
Contents
STM6904
Contents
1 2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 2.2 2.3 2.4 2.5 2.6 2.7 Push-button reset input (MR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 VCC primary supply voltage monitoring input . . . . . . . . . . . . . . . . . . . . . . . 7 V2IN second fixed voltage monitoring input . . . . . . . . . . . . . . . . . . . . . . . . 7 VSS
.....................................................................7
V3IN and V4IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 RST active-low, open drain reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 TRSEL input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 3.2 Setting the adjustable voltage levels for V3IN and V4IN inputs . . . . . . . . 10 Power on reset (tREC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 5 6 7 8 9 10
Voltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Package marking information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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STM6904
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 TSSOP 8-lead package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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List of figures
STM6904
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 MR timing waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Voltage monitoring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 TSSOP8, 3 x 3mm, package mechanical outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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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). Two of the four supply monitors (VCC and V2IN) have fixed (customer-selectable, factory-trimmed) thresholds (VRST1 and VRST2). The other two voltage monitor inputs (V3IN and V4IN) are monitored using externally adjustable threshold (0.600V 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 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. This device is in the correct reset output logic state when VCC greater than 0.8V. The STM6904 is available in a standard 8-lead MSOP (TSSOP) package. Figure 1. Logic diagram
VCC V2IN V3IN V4IN MR TRSEL VSS
ai13976
STM6904
RST
Figure 2.
MSOP/TSSOP-8 connections
MR VCC V2IN VSS
1 2 3 4
8 7 6 5
RST TRSEL V4IN V3IN
ai13977
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Description
STM6904
Table 2.
Pin 1 2 3 4 5 6
Signal names and functions
Name MR VCC V2IN VSS V3IN V4IN Type Input Supply Input Supply Input Input 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 Controls selectable tREC. Two tREC options available. If pin is tied HIGH (VCC), tREC = 420ms If pin is tied LOW (VSS), tREC = 210ms Note: Pin must be tied to VCC or VSS (Do not float) Active-low open-drain reset output (10k ohm internal pull-up)
7
TRSEL
Input
8
RST
Output
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STM6904
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 0.1 uF 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 and V4IN
The V3IN and V4IN 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 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.
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Pin descriptions
STM6904
2.7
TRSEL input
Allows user to select between two values of tREC timing (210 ms or 420 ms). Pin must be tied to VSS (210 ms) or VCC (420 ms).
Figure 3.
Functional block diagram
VCC VRST1
V2IN
COMPARE
VRST2
V3IN
COMPARE
VREF= 0.6V
V4IN
COMPARE
trec Generator
RST
VCC (1) MR
TR
VREF= 0.6V
COMPARE
SEL
ai13978
1. Internal pull-up on MR input of 10k ohm (typ).
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STM6904 Figure 4. Typical hardware hookup application diagram
Pin descriptions
From DC/DC Converter VCC2 VTRIP = (600mV) VTRIP = (600mV) + ( R1R2R2 ) + ( R3R4R4 ) VCC1 VCC 0.1 F STM6904 VIN2 VCC3 0.1 F R1 VIN3 R2 R3 VIN4 R4 VCC (1) TRSEL VSS MR Push-button Switch VCC4 RST RST (To Processor Reset)
ai13979
1. TRSEL must be tied to VCC (trec = 420 ms) or to VSS (trec = 210 ms).
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Operation
STM6904
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 output is open drain and requires a 10k ohms pull-up resistor tied to VCC.
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 (VREF) according to the following formula:
VTRIP = 0.6V x
R1 + R 2 R2
During normal operation, the STM6904 monitors the voltage levels at all four pins (VCC, V2IN, V3IN, and V4IN).
3.2
Power on reset (tREC)
On power up, the STM6904 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 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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STM6904
Voltage monitoring
4
Voltage monitoring
Figure 5.
MR timing waveforms
tMLMH MR tMLMR RST tREC
ai13974
Figure 6.
Voltage monitoring diagram
VCC, VXIN VRST1/2, VRSTIN RST tRD
trec
ai13975
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Maximum rating
STM6904
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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STM6904
DC and AC parameters
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
DC and AC characteristics
Alternative Description Operating voltage VCC supply current V2IN supply curent Input leakage current (MR)(2) VCC < 5.5 V VCC = 3.3 V V2IN = 3.3 V VIN = VSS VIN = VSS or VCC VCC > VRST; RST not asserted VCC 0.8V, ISINK = 1A VCC 1.0V, ISINK = 50A Output low voltage (RST; open drain) VCC 1.2V, ISINK = 100A VCC 2.7V, ISINK = 1.2mA VCC 4.5V, ISINK = 3.2mA 25C T (falling) -40C to 85C 3.023 2.925 2.902 2.837 2.814 2.866 2.955 3.133 2.985 3.008 2.895 2.918 V V 25C VTH1 VCC reset threshold S (falling) -40C to 85C 25C P (falling) -40C to 85C 3.047 3.078 -0.5 -0.5 Test condition(1) Min 0.8 10 9 3 500 Typ Max 5.5 14 A 13 5 800 +0.5 +0.5 0.3 0.3 0.3 0.3 0.4 3.109 A A A A V V V V V V Unit V
ILI
Input leakage current (TRSEL) Open drain RST output leakage current
ILO(3)
VOL
VRST1(4)
13/21
DC and AC parameters Table 4.
Sym
STM6904
DC and AC characteristics (continued)
Alternative Description Test condition(1) 25C Z (falling) -40C to 85C 25C Y (falling) -40C to 85C 2.149 1.666 1.653 1.099 1.090 1.040 1.031 0.5 20 20 140 280 210 420 280 560 1.050 1.110 1.683 2.227 1.700 1.713 1.121 1.130 1.061 1.069 % s s ms ms V V V 25C VTH2 V2IN reset threshold W (falling) -40C to 85C 25C G (falling) -40C to 85C 25C F (falling) -40C to 85C Reset threshold hysteresis Referenced to VRST1/VRST2 typical VCC = (VRST1 + 100 mV) to (VRST1 - 100 mV) V2IN = (VRST2 + 75 mV) to (VRST2 - 75 mV) TRSEL = LOW (VSS) TRSEL = HIGH (VCC) 2.291 2.166 2.188 2.375 2.210 V Min 2.310 Typ 2.333 Max 2.356 Unit V
VRST2(4)
VHYST
tRD
VCC to RST delay
tREC(5)
tRP
RST time-out period
Adjustable reset comparator input (V3IN and V4IN)
VRSTIN I3IN, I4IN
V3IN, V4IN input threshold V3IN, V4IN input current V3IN, V4IN hysteresis V3IN, V4IN > 0.8 V
589 -25
600
611 +25
mV nA mV s
3 22
tRSTIND
V3IN, V4IN to RST output VRSTIN to (VRSTIN - 30 mV) delay
Manual (push-button) reset input
VIL VIH tMLMH tMLRL tMR tMRD
MR input voltage 0.7 x VCC MR minimum pulse width MR to RST output delay 1 200
0.3 x VCC
V V s ns
14/21
STM6904 Table 4.
Sym
DC and AC parameters DC and AC characteristics (continued)
Alternative Description MR glitch immunity MR pull-up resistance Test condition(1) Min Typ 100 10 Max Unit ns k
1. Valid for ambient operating temperature: TA = -40C to +85C; VCC = 0.8V to 5.5V (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.
15/21
Package mechanical data
STM6904
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
16/21
STM6904
Package mechanical data
Table 5.
Symbol
TSSOP 8-lead package mechanical data
mm Min Typ Max 1.10 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
17/21
Part numbering
STM6904
8
Part numbering
Table 6.
Example:
Ordering information scheme
STM6904 TZ E DS 6 F
Device type STM6904
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 2.188 1.050 1.683
tREC(1) E = 210ms or 420ms
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.
18/21
STM6904
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 1.050 2.188 1.683 Package MSOP (TSSOP8) MSOP (TSSOP8) MSOP (TSSOP8) MSOP (TSSOP8) MSOP (TSSOP8) MSOP (TSSOP8) Topside marking STZ4 STW4 STG4 SSF4 SSY4 SPW4
Part marking STM6904TZEDS6F STM6904TWEDS6F STM6904TGEDS6F STM6904SFEDS6F STM6904SYEDS6F STM6904PWEDS6F
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Revision history
STM6904
10
Revision history
Table 8.
Date 19-Dec-2007 28-Jan-2008
Document revision history
Revision 1 2 Initial release. Updated cover page, Figure 6 and Table 4. Changes
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STM6904
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