STM6717/6718/6719/6720
STM6777/6778/6779/6780
Dual/triple ultra-low voltage supervisors
with push-button reset (with delay option)
Features
■
■
■
■
■
■
■
■
■
■
■
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,
900ms (typ)
Manual reset input (MR)
Optional delayed manual reset input (MRC)
with external capacitor (STM6777/78/79/80)
Low supply current - 11µA (typ),
V
CC1
= V
CC2
= 3.6V
Operating temperature: –40°C to 85°C
(industrial grade)
Device summary
Monitored voltages
Part
number
STM6717
STM6718
STM6719
STM6720
STM6777
STM6778
STM6779
STM6780
V
CC1
✔
✔
✔
✔
✔
✔
✔
✔
V
CC2
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
RSTIN
Manual reset
input (MR)
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
Delayed
MR pin
(MRC)
Reset output (RST)
Active-low
(push-pull)
Active-low
(open drain)
✔
Package
SOT23-6 (WB)
SOT23-5 (WY)
Table 1.
WY
WY
WB
WB
WB
WB
WB
WB
December 2007
Rev 6
1/29
www.st.com
1
Contents
STM6717/6718/6719/6720/STM6777/6778/6779/6780
Contents
1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1.1
1.1.2
1.1.3
1.1.4
1.1.5
1.1.6
1.1.7
Active-low, push-pull reset output (RST) - STM6718/20/78/80 . . . . . . . . 7
Active-low, open drain reset output (RST) - STM6717/19/77/79 . . . . . . . 7
Push-button reset input (MR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Manual reset delay input (MRC) - STM6777/78/79/80) . . . . . . . . . . . . . . 8
Primary supply voltage monitoring input (V
CC1
) . . . . . . . . . . . . . . . . . . . 8
Secondary supply voltage monitoring input (V
CC2
) . . . . . . . . . . . . . . . . . 8
Adjustable reset comparator input (RSTIN; STM6719/20/79/80) . . . . . . 8
2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1
Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
4
5
6
7
8
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2/29
STM6717/6718/6719/6720/STM6777/6778/6779/6780
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
t
MLMH
minimum pulse width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SOT23-5 – 5-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . . 23
SOT23-6 – 6-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . . 24
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3/29
List of figures
STM6717/6718/6719/6720/STM6777/6778/6779/6780
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Logic diagram (STM6717/18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Logic diagram (STM6777/78) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Logic diagram (STM6719/20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Logic diagram (STM6779/80) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STM6717/18 SOT23-5 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
STM6777/78 SOT23-6 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
STM6719/20 SOT23-6 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
STM6779/80 SOT23-6 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
STM67xx interface to processor with bi-directional reset pins . . . . . . . . . . . . . . . . . . . . . . 10
Ensuring RST valid to V
CC
= 0 (active-low, push-pull outputs). . . . . . . . . . . . . . . . . . . . . . 10
Supply current vs. temperature (V
CC1
= 5.5V; V
CC2
= 3.6V) . . . . . . . . . . . . . . . . . . . . . . . 11
Supply current vs. temperature (V
CC1
= 3.6V; V
CC2
= 2.75V) . . . . . . . . . . . . . . . . . . . . . . 11
Supply current vs. temperature (V
CC1
= 3.0V; V
CC2
= 2.0V) . . . . . . . . . . . . . . . . . . . . . . . 12
Supply current vs. temperature (V
CC1
= 2.0V; V
CC2
= 1.0V) . . . . . . . . . . . . . . . . . . . . . . . 12
Normalized V
CC
reset time-out period vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maximum V
CC
transient duration vs. reset threshold overdrive . . . . . . . . . . . . . . . . . . . . . 13
Normalized V
RST1
threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Normalized V
RST2
threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Reset input threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
V
CC1
-to-reset delay vs. temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Reset input-to-reset output delay vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
MR-to-reset output delay vs. temperature (V
CC1
= 3.6V) . . . . . . . . . . . . . . . . . . . . . . . . . . 16
AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
MR timing waveform (STM6717/18/19/20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
MR timing waveform (STM6777/78/79/80) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SOT23-5 – 5-lead small outline transistor package mechanical drawing . . . . . . . . . . . . . . 22
SOT23-6 – 6-lead small outline transistor package mechanical drawing . . . . . . . . . . . . . . 23
4/29
STM6717/6718/6719/6720/STM6777/6778/6779/6780
Description
1
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, designed 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 communication systems.
All device options have a push-button-type manual 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 6µs (MRC pin left open) or more with external capacitor. The
delay is implemented by connecting the appropriately sized capacitor between the MRC pin
and V
SS
(typical 4s delay with a 3.3µF capacitor, see
Table 7 on page 21).
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 adjustable 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 guaranteed 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 on
page 1).
5/29
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