STMicroelectronics STM6315 Datasheet
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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.
STM6315
Open drain microprocessor reset
SOT143-4 (W1)
March 2007 Rev 5 1/21
www.st.com
1
Contents
Contents
STM6315
transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
CC
= 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/21
STM6315
List of tables
List of tables
SOT143-4 – 4-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 17
3/21
List of figures
List of figures
STM6315
Supply current vs. supply voltage, V
= 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
Max. transient duration not causing reset pulse vs. reset threshold Overdrive . . . . . . . . . 11
4/21
STM6315 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
Symbol
V
CC
MR
RST
V
SS
Description
Supply voltage
Manual reset input
Active-low open drain reset output
Ground
Figure 2.
SOT143-4 connections (top view)
V
SS
RST
1
2
4
V
CC
3 MR
AI11163
5/21
Summary description
Figure 3.
Block diagram
VCC
VRST
MR
COMPARE
DEBOUNCE
STM6315
trec
Generator
RST
AI11164
Figure 4.
Hardware hookup
VCC
Manual
Reset
VCC
STM6315
10k
VCC
MCU
MR
VSS
RST
(1) RESET
Input
VSS
AI11165
1.
Open drain RST output requires external pull-up resistor.
6/21
STM6315
2 Operation
Operation
2.2
The STM6315 Microprocessor Reset Circuit has an active-low, open drain reset output. This output structure will sink current when RST is asserted. Connect a pull-up resistor from RST
to any supply voltage up to 6V (see
). Select a resistor value large enough to register a logic low, and small enough to register a logic high while supplying all input current and leakage paths connected to the reset output line. A 10k pull-up is sufficient in most applications.
The STM6315 asserts a reset signal to the MCU whenever V
CC
goes below the reset threshold (V
RST
), or when the manual reset input (MR) is taken low (see
and
). RST is guaranteed valid down to V
CC
= 1.0V.
During power-up, (once V
CC
exceeds the reset threshold) an internal timer keeps RST low for the reset time-out period, t rec
. After this interval, RST returns high.
If V
CC
drops below the reset threshold, RST goes low. Each time RST is asserted, it stays low for at least the reset time-out period. Any time V
CC
goes below the reset threshold, the internal timer clears. The reset timer starts when V
CC
returns above the reset threshold.
Manual reset input
A logic low on MR asserts RST. RST remains asserted while MR is low, and for t rec
after it returns high. The MR input has an internal pull-up resistor 63k
Ω (typ), allowing it to be left open if not used.
This input can be driven with TTL/CMOS-logic levels or with open drain/collector outputs.
Connect a standard open push-button switch from MR to V
SS
to create a manual reset
); external debounce circuitry is not required. If the device is
used in a noisy environment, connect a 0.1µF capacitor from MR to V
SS
to provide additional noise immunity.
The STM6315 is relatively immune to negative-going V
CC
transients (glitches).
shows typical transient duration versus reset comparator overdrive (for which the
STM6315 will NOT generate a reset pulse). The graph was generated using a negative pulse applied to V
CC
, starting at 0.5V above the actual reset threshold and ending below it by the magnitude indicated (Reset Threshold Overdrive). The graph indicates the maximum pulse width a negative V
CC
transient can have without causing a reset pulse. As the magnitude of the transient increases (further below the threshold), the maximum allowable pulse width decreases. Any combination of duration and overdrive which lies under the curve will NOT generate a reset signal (see
). A 0.1µF bypass capacitor mounted
as close as possible to the V
CC
pin provides additional transient immunity.
7/21
Operation STM6315
RST output down to V
CC
= 0V
When V
CC
falls below 1V, the RST output no longer sinks current, but becomes an open circuit. In most systems this is not a problem, as most MCUs do not operate below 1V.
However, in applications where RST output must be valid down to 0V, a pull-down resistor may be added to hold the RST output low. This resistor must be large enough to not load the RST output, and still be small enough to pull the output to Ground. A 100K
Ω resistor is recommended.
Figure 5.
Reset timing diagram
VCC
VRST
RST
VCC (min) trec
AI11166
Figure 6.
Manual reset timing diagram, switch bounce/debounce
MR Glitch Rejection
MR
MR Input Pulse Width
RST trec
MR-to-RST Delay
AI11167b
8/21
STM6315
3 Typical operating characteristics
Typical operating characteristics
Note: Typical values are at T
A
= 25°C.
Figure 7.
Supply current vs. supply voltage, V
RST
= 2.63V
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Supply Voltage, VCC (V)
3.5
4.0
4.5
5.0
5.5
AI11871c
Figure 8.
Supply current vs. temperature (no load), V
RST
= 2.63V
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
–40 –20 0 20 40
Temperature, TA (°C)
60 80
VCC = 2V
VCC = 3V
VCC = 4V
VCC = 5V
100 120
AI11872c
9/21
Typical operating characteristics
Figure 9.
RST output voltage vs. output current, V
CC
= 4.25V
0.20
0.16
0.12
0.08
0.04
0
0 3 6
Output Current (mA)
9
Figure 10.
Normalized reset time-out period vs. temperature
1.14
1.12
1.10
1.08
1.06
t rec
1.04
1.02
1.00
0.98
–40 –20 0 20 40 60
Temperature, TA (°C)
80 100 120
AI11875b
12
AI11873c
STM6315
10/21
STM6315
Figure 11.
Normalized reset threshold vs. temperature
1.01
1.005
1
0.995
Typical operating characteristics
0.99
–40 –20 0 20 40 60
Temperature, TA (°C)
80 100 120
AI11876c
Figure 12.
Max. transient duration not causing reset pulse vs. reset threshold Overdrive
100
90
80
70
60
50
40
30
20
10
0
1 10 100
Reset Threshold Overdrive (mV)
1000
AI11877
Note: Reset occurs above the curve.
11/21
Maximum rating STM6315
Stressing the device above the rating listed in the
Table 2: Absolute maximum ratings
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 2.
Symbol
Absolute maximum ratings
Parameter Value Unit
T
STG
T
SLD
(1)
V
IO
V
CC
I
O
P
D
Storage temperature (V
Input or output voltage
Supply voltage
Output current
Power dissipation
CC
Off)
Lead solder temperature for 10 seconds
–55 to 150
260
–0.3 to V
CC
+ 0.3
–0.3 to 7.0
20
320
°C
°C
V
V mA mW
1.
Reflow at peak temperature of 260°C (total thermal budget not to exceed 245°C for greater than 30 seconds).
12/21
STM6315
5 DC and AC parameters
DC and AC parameters
This section summarizes the operating measurement conditions, and the DC and AC characteristics of the device. The parameters in the DC and AC characteristics Tables that follow are derived from tests performed under the measurement conditions summarized in
Table 3: Operating and AC measurement conditions
. Designers should check that the
operating conditions in their circuit match the operating conditions when relying on the quoted parameters.
Table 3.
Operating and AC measurement conditions
Parameter
V
CC
Supply Voltage
Ambient Operating Temperature (T
A
)
Input Rise and Fall Times
Input Pulse Voltages
Input and Output Timing Reference Voltages
STM6315
1.0 to 5.5
–40 to +125
~5
0.2 to 0.8V
CC
0.3 to 0.7V
CC
Figure 13.
AC testing input/output waveforms
Unit
V
°C ns
V
V
0.8VCC
0.2VCC
0.7VCC
0.3VCC
AI02568
13/21
DC and AC parameters STM6315
Table 4.
Sym
DC and AC characteristics
Description Test Condition
(1)
Min Typ Max Unit
V
CC
Operating voltage 1.0
5.5
V
I
V
CC
OL
V
CC
supply current
RST output voltage
V
CC
= 5.5V, no load
T
A
= –40 to +85°C
V
CC
= 5.5V, no load
T
A
= –40 to +125°C
V
CC
= 3.6V, no load
T
A
= –40 to +85°C
V
CC
= 3.6V, no load
T
A
= –40 to +125°C
V
CC
> 4.25V, I
SINK
= 3.2
m
A
V
CC
> 2.5V, I
SINK
= 1.2
m
A
V
CC
> 1.0V, I
SINK
= 80
µ
A
V
CC
> V
RST
, RST not asserted
2.0
1.5
12
15
10
12
0.4
0.3
0.3
µA
µA
µA
µA
V
V
V
RST output open drain
Leakage Current
Reset Thresholds
1 µA
V
RST t t
RD rec
Reset threshold
(2)
for detailed listing)
V
CC
-to-RST delay
RST pulse width
(2)
STM6315xAxxxx
STM6315xBxxxx
STM6315xDxxxx
V
CC
falling; T
A
= 25°C V
RST
– 1.8%
V
CC
falling; T
A
= –40 to 85°C V
RST
– 2.5%
V
CC
falling; T
A
= –40 to 125°C V
RST
– 3.5%
V
CC
falling from
(V
RST
+ 100mV) to
(V
RST
– 200mV) at 1mV/µs
1 T
A
= –40 to +85°C
T
A
= –40 to +125°C
T
A
= –40 to +85°C
T
A
= –40 to +125°C
0.8
20
16
140
STM6315xGxxxx
T
A
= –40 to +85°C
T
A
= –40 to +125°C
T
A
= –40 to +85°C
T
A
= –40 to +125°C
112
1120
896
Reset threshold temperature coefficient
V
RST
V
RST
+ 1.8%
V
RST
+ 2.5%
V
RST
+ 3.5%
35
1.5
30
210
1680
60
2
2.4
40
48
280
336
2240
2688
V
V
V
µs ms ms ms ms ms ms ms ms ppm/°C
14/21
STM6315 DC and AC parameters
Table 4.
Sym
DC and AC characteristics (continued)
Description Test Condition
(1)
Min Typ Max Unit
Manual Reset Input
V
V
IL
IH
MR low input threshold
MR low input threshold
V
V
V
V
RST
RST
RST
RST
> 4.0V
< 4.0V
> 4.0V
< 4.0V
0.8
0.3V
CC
2.4
0.7V
CC
MR input pulse width
MR glitch rejection
MR-to-RST delay
MR pull-up resistance
1
100
500
63 32 100
1.
Valid for ambient operating temperature: T
A
= –40 to 125°C; V
CC
= 2.5 to 5.5V (except where noted).
2.
Other V
RST availability.
thresholds and t rec
timings are offered. Minimum order quantities may apply. Contact local sales office for
V
V
V
V
µs ns ns k
Ω
15/21
Package mechanical data
6 Package mechanical data
STM6315
In order to meet environmental requirements, ST offers these devices in ECOPACK
® 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.
16/21
STM6315 Package mechanical data
Figure 14.
SOT143-4 – 4-lead small outline transistor package outline
E
E1
B
0.15
M
C A B
A1 e1
1 e/2 e
D
0.15
M
C A B b2
Note:
3X b
0.20
M
C A B
C
A
C 0.10
C
4X
A
A2
θ
L1
C
L
SOT143-4 b2
C
D
E
A
A1
A2 b
E1 e e1
L
L1
Θ
N
Drawing is not to scale.
Table 5.
SOT143-4 – 4-lead small outline transistor package mechanical data mm inches
Symbol
Typ
–
–
–
–
–
–
–
–
–
1.92
0.20
0.55
–
Min
1.20
–
–
–
0.40
0°
4
0.76
0.09
2.80
2.10
0.89
0.01
0.88
0.37
Max
1.40
–
–
–
0.60
10°
0.94
0.18
3.04
2.64
1.12
0.10
1.02
0.51
Typ
–
–
–
–
–
–
–
–
–
0.076
0.008
0.022
–
Min
0.047
–
–
–
0.016
0°
4
0.035
0.001
0.035
0.015
0.030
0.004
0.110
0.083
Max
0.055
–
–
–
0.024
10°
0.044
0.004
0.042
0.020
0.037
0.007
0.120
0.104
17/21
Part numbering STM6315
Note:
Table 6.
Ordering information scheme
Example: STM6315 R
Device Type
STM6315
Reset Threshold Voltage
(1)
L = V
RST
= 4.63V
M = V
RST
= 4.38V
S = V
RST
= 2.93V
R = V
RST
= 2.63V
RST Pulse Width
(1)
A = t rec
= 1.5ms
B = t rec
= 30ms
D = t rec
= 210ms
G = t rec
= 1680ms
Package
W1 = SOT143-4
Temperature Range
3 = –40 to 125°C
D W1 3 F
Shipping Method
F = ECOPACK Package, Tape & Reel
1.
Other V
RST
thresholds and t rec
timings are offered. Minimum order quantities may apply. Contact local sales office for availability.
For other options, or for more information on any aspect of this device, please contact the
ST Sales Office nearest you.
18/21
STM6315 Part numbering
Table 7.
Marking description
Part Number
Reset Threshold
(1)
(V)
RST Pulse Width
(1)
(ms)
Output
Topside
Marking
(2)
STM6315LB
STM6315MD
STM6315SD
STM6315RA
STM6315RB
4.63
4.38
2.93
2.63
2.63
30
210
210
1.5
30
Open drain RST 9LBx
Open drain RST 9MDx
Open drain RST 9SDx
Open drain RST 9RAx
Open drain RST 9RBx
STM6315RD
STM6315RG
2.63
2.63
210
1680
Open drain RST 9RDx
Open drain RST 9RGx
1.
Other V
RST
thresholds and t rec
timings are offered. Minimum order quantities may apply. Contact local sales office for availability.
2.
Where "x" = Assembly Work Week (A to Z), such that "A" = WW01-02, "B" = WW03-04, and so forth.
19/21
Revision history STM6315
Table 8.
Date
Document revision history
14-Nov-2005
08-Feb-2006
12-Apr-2006
27-Jul-2006
21-Mar-2007
Revision
1.0
2.0
3
4
5
Changes
First edition.
Update template, characteristics, marking (Figure
Updated characteristics (Figure
,
,
,
,
20/21
STM6315
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