STM6315
Open drain microprocessor reset
Features
■
■
■
■
■
■
■
Low supply current of 1.5µA (typ)
±1.8% reset threshold accuracy (25°C)
Guaranteed RST assertion down to
V
CC
= 1.0V
Open drain RST output can exceed V
CC
Power supply transient immunity
Operating temperature: –40 to +125°C
Available in SOT143-4 package.
SOT143-4 (W1)
March 2007
Rev 5
1/21
www.st.com
1
Contents
STM6315
Contents
1
2
Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
2.2
2.3
2.4
Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Manual reset input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Negative-going V
CC
transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Valid RST output down to V
CC
= 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
4
5
6
7
8
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21
STM6315
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SOT143-4 – 4-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 17
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3/21
List of figures
STM6315
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.
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SOT143-4 connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Manual reset timing diagram, switch bounce/debounce . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Supply current vs. supply voltage, V
RST
= 2.63V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Supply current vs. temperature (no load), V
RST
= 2.63V . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
RST output voltage vs. output current, V
CC
= 4.25V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Normalized reset time-out period vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Max. transient duration not causing reset pulse vs. reset threshold Overdrive . . . . . . . . . 11
AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
SOT143-4 – 4-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 17
4/21
STM6315
Summary description
1
Summary description
The STM6315 Microprocessor Reset Circuit is a low power supervisory device used to
monitor power supplies. It performs a single function: asserting a reset signal whenever the
V
CC
supply voltage drops below a preset value and keeping it asserted until V
CC
has risen
above the preset threshold for a minimum period of time (t
rec
). It also provides a manual
reset input (MR). The open drain RST output can be pulled up to a voltage higher than V
CC
,
but less than 6V.
The STM6315 comes with standard factory-trimmed reset thresholds of 2.63V, 2.93V,
3.08V, 4.38V, and 4.63V. The STM6315 is available in the SOT143-4 package.
Figure 1.
Logic diagram
V
CC
MR
STM6315
RST
V
SS
AI11162
Table 1.
Signal names
Description
Supply voltage
Manual reset input
Active-low open drain reset output
Ground
Symbol
V
CC
MR
RST
V
SS
Figure 2.
SOT143-4 connections (top view)
V
SS
RST
1
2
4
3
V
CC
MR
AI11163
5/21
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