1/25
September 2005
STM6717/6718/6719/6720
STM6777/6778/6779/6780
Dual/Triple Ultra-Low Voltage Supervisors
with Push-Button Reset (with Delay Option)
Rev 2.0
FEATURES SUMMARY
PRIMARY SUPPLY (V
CC1
) MONITOR.
FIXED (FACTORY-PROGRAMMED) RESET
THRESHOLDS: 4.63V TO 1.58V
SECONDARY SUPPLY (V
CC2
) MONITOR
(STM6717/18/19/20/77/78).
FIXED (FACTORY-PROGRAMMED) RESET
THRESHOLDS: 3.08V TO 0.79V
TERTIARY SUPPLY MONITOR (USING
EXTERNALLY ADJUSTABLE RSTIN):
0.626V INTERNAL REFERENCE
RST OUTPUTS (PUSH-PULL OR OPEN
DRAIN); STATE GUARANTEED IF V
CC1
OR
V
CC2
0.8V
RESET DELAY TIME (t
rec
) ON POWER-UP:
210ms (typ)
MANUAL RESET INPUT (MR)
OPTIONAL DELAYED MANUAL RESET
INPUT (MRC) WITH EXTERNAL
CAPACITOR (STM6777/78/79/80)
LOW SUPPLY CURRENT - 11A (TYP),
V
CC1
= V
CC2
= 3.6V
OPERATING TEMPERATURE:
40C to 85C (Industrial Grade)
Figure 1. Packages
Table 1. Device Options
SOT23-5 (WY)
SOT23-6 (WB)
Part
Number
Monitored Voltages
Manual Reset
Input (MR)
Delayed MR
Pin (MRC)
Reset Output (RST)
Package
V
CC1
V
CC2
RSTIN
Active-Low
(Push-Pull)
Active-Low
(Open Drain)
STM6717
WY
STM6718
WY
STM6719
WB
STM6720
WB
STM6777
WB
STM6778
WB
STM6779
WB
STM6780
WB
STM6717/6718/6719/6720/6777/6778/6779/6780
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TABLE OF CONTENTS
FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 1. Device Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 2. Logic Diagram (STM6717/18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 3. Logic Diagram (STM6719/20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 4. Logic Diagram (STM6777/78) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 5. Logic Diagram (STM6779/80) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 2. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 6. STM6717/18 SOT23-5 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 7. STM6719/20 SOT23-6 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 8. STM6777/78 SOT23-6 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 9. STM6779/80 SOT23-6 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Pin Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 10.Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 11.Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Applications Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 12.STM67xx Interface to Processor with Bi-directional Reset Pins . . . . . . . . . . . . . . . . . . . . 8
Figure 13.Ensuring RST Valid to V
CC
= 0 (Active-Low, Push-Pull Outputs) . . . . . . . . . . . . . . . . . . . 8
TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 14.Supply Current vs. Temperature (V
CC1
= 5.5V; V
CC2
= 3.6V). . . . . . . . . . . . . . . . . . . . . . 9
Figure 15.Supply Current vs. Temperature (V
CC1
= 3.6V; V
CC2
= 2.75V). . . . . . . . . . . . . . . . . . . . . 9
Figure 16.Supply Current vs. Temperature (V
CC1
= 3.0V; V
CC2
= 2.0V). . . . . . . . . . . . . . . . . . . . . 10
Figure 17.Supply Current vs. Temperature (V
CC1
= 2.0V; V
CC2
= 1.0V). . . . . . . . . . . . . . . . . . . . . 10
Figure 18.Normalized V
CC
Reset Time-out Period vs. Temperature. . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 19.Maximum V
CC
Transient Duration vs. Reset Threshold Overdrive . . . . . . . . . . . . . . . . . 11
Figure 20.Normalized V
RST1
Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 21.Normalized V
RST2
Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 22.Reset Input Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 23.V
CC1
-to-Reset Delay vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 24.Reset Input-to-Reset Output Delay vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 25.MR-to-Reset Output Delay vs. Temperature (V
CC1
= 3.6V) . . . . . . . . . . . . . . . . . . . . . . 14
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 4. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 5. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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STM6717/6718/6719/6720/6777/6778/6779/6780
Figure 26.AC Testing Input/Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 27.MR Timing Waveform (STM6717/18/19/20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 28.MR Timing Waveform (STM6777/78/79/80) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 6. DC and AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 7. t
MLMH
Minimum Pulse Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 29.SOT23-5 5-lead Small Outline Transistor Package Mechanical Drawing . . . . . . . . . . 21
Table 8. SOT23-5 5-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . . 21
Figure 30.SOT23-6 6-lead Small Outline Transistor Package Mechanical Drawing . . . . . . . . . . 22
Table 9. SOT23-6 6-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . . 22
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 10. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 11. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
STM6717/6718/6719/6720/6777/6778/6779/6780
4/25
SUMMARY DESCRIPTION
The STM6717/18/19/20 and STM6777/78/79/80
Supervisors are a family of low voltage/low supply
current processor (Micro or DSP) Supervisors, de-
signed to monitor two (or three) system power
supply voltages. They are targeted at applications
such as Set-Top Boxes (STBs), portable, battery-
powered systems, networking, and communica-
tion systems.
All device options have a push-button-type manu-
al reset input (MR). The STM6777/78/79/80 also
includes an option which enables the user to delay
the start of the Manual Reset process from 6s
(MRC pin left open) or more with external capaci-
tor. The delay is implemented by connecting the
appropriately sized capacitor between the MRC
pin and V
SS
(typical 4s delay with a 3.3F capaci-
tor, see
Table 7., page 19
).
Two of the three supplies monitored (V
CC1
and
V
CC2
) have fixed (customer-selectable, factory-
trimmed) thresholds (V
RST1
and V
RST2
). The third
voltage is monitored using an externally adjust-
able RSTIN threshold (0.626V internal reference).
If any of the three monitored voltages drop below
its factory-trimmed or adjustable thresholds, or if
MR is asserted to logic low, a RST is asserted
(driven low). Once asserted, RST is maintained at
Low for a minimum delay period (t
rec
) after ALL
supplies rise above their respective thresholds
and MR returns to High. These devices are guar-
anteed to be in the correct reset output logic state
when V
CC1
and/or V
CC2
is greater than 0.8V.
These devices are available in a standard 5-pin or
6-pin SOT23 packages (see
Table 1., page 1
).
Figure 2. Logic Diagram (STM6717/18)
Figure 3. Logic Diagram (STM6719/20)
Figure 4. Logic Diagram (STM6777/78)
Figure 5. Logic Diagram (STM6779/80)
AI10413
V
CC1
STM6717
STM6718
V
SS
V
CC2
RST
MR
AI10414
V
CC1
STM6719
STM6720
V
SS
V
CC2
RST
RSTIN
MR
AI10415
V
CC1
STM6777
STM6778
V
SS
V
CC2
RST
MRC
MR
AI10416
V
CC
STM6779
STM6780
V
SS
RST
MRC
RSTIN
MR
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