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STM6315
Open drain microprocessor reset
Features

Low supply current of 1.5A (typ) 1.8% reset threshold accuracy (25C) Guaranteed RST assertion down to VCC = 1.0V Open drain RST output can exceed VCC Power supply transient immunity Operating temperature: -40 to +125C Available in SOT143-4 package. SOT143-4 (W1)
March 2007
Rev 5
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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 VCC transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Valid RST output down to VCC = 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
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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
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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, VRST = 2.63V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Supply current vs. temperature (no load), VRST = 2.63V . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 RST output voltage vs. output current, VCC = 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
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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 VCC supply voltage drops below a preset value and keeping it asserted until VCC has risen above the preset threshold for a minimum period of time (trec). It also provides a manual reset input (MR). The open drain RST output can be pulled up to a voltage higher than VCC, 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
VCC
MR
STM6315
RST
VSS
AI11162
Table 1.
Signal names
Description Supply voltage Manual reset input Active-low open drain reset output Ground
Symbol VCC MR RST VSS
Figure 2.
SOT143-4 connections (top view)
VSS RST
1 2
4 3
VCC MR
AI11163
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Summary description Figure 3. Block diagram
VCC VRST COMPARE trec Generator DEBOUNCE
STM6315
RST
MR
AI11164
Figure 4.
Hardware hookup
VCC VCC VCC
10k
STM6315
MCU
MR Manual Reset
RST(1)
RESET Input VSS
VSS
AI11165
1. Open drain RST output requires external pull-up resistor.
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STM6315
Operation
2
2.1
Operation
Reset output
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 Figure 4 on page 6). 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 VCC goes below the reset threshold (VRST), or when the manual reset input (MR) is taken low (see Figure 5 and Figure 6 on page 8). RST is guaranteed valid down to VCC = 1.0V. During power-up, (once VCC exceeds the reset threshold) an internal timer keeps RST low for the reset time-out period, trec. After this interval, RST returns high. If VCC 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 VCC goes below the reset threshold, the internal timer clears. The reset timer starts when VCC returns above the reset threshold.
2.2
Manual reset input
A logic low on MR asserts RST. RST remains asserted while MR is low, and for trec after it returns high. The MR input has an internal pull-up resistor 63k (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 VSS to create a manual reset function (see Figure 4 on page 6); external debounce circuitry is not required. If the device is used in a noisy environment, connect a 0.1F capacitor from MR to VSS to provide additional noise immunity.
2.3
Negative-going VCC transients
The STM6315 is relatively immune to negative-going VCC transients (glitches). Figure 12 on page 11 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 VCC, 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 VCC 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 Figure 12). A 0.1F bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity.
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Operation
STM6315
2.4
Valid RST output down to VCC = 0V
When VCC 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 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
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STM6315
Typical operating characteristics
3
Note: Figure 7.
Typical operating characteristics
Typical values are at TA = 25C. Supply current vs. supply voltage, VRST = 2.63V
3.00 2.75 2.50 Supply Current, ICC (A) 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 3.5 Supply Voltage, VCC (V) 4.0 4.5 5.0 5.5
AI11871c
Figure 8.
Supply current vs. temperature (no load), VRST = 2.63V
2.25 2.00
Supply Current, ICC (A)
1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 -40 -20 0 20 40 60 Temperature, TA (C) 80 100 120
AI11872c
VCC = 2V VCC = 3V VCC = 4V VCC = 5V
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Typical operating characteristics Figure 9. RST output voltage vs. output current, VCC = 4.25V
STM6315
0.20
0.16 Output Voltage (V)
0.12
0.08
0.04
0 0 3 6 Output Current (mA) 9 12
AI11873c
Figure 10. Normalized reset time-out period vs. temperature
1.14 Normalized Reset Time-out Period, trec/trec (typ) (-) 1.12 1.10 1.08 1.06 1.04 1.02 1.00 0.98 -40
-20
0
20 40 60 Temperature, TA (C)
80
100
120
AI11875b
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STM6315 Figure 11. Normalized reset threshold vs. temperature
Normalized Reset Threshold, VRST/VRST-typ (-)
Typical operating characteristics
1.01
1.005
1
0.995
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 Transient Duration (s) 80 70 60 50 40 30 20 10 0 1 10 100 Reset Threshold Overdrive (mV) 1000
AI11877
Note:
Reset occurs above the curve.
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Maximum rating
STM6315
4
Maximum rating
Stressing the device above the rating listed in the Table 2: Absolute maximum ratings 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 2.
Symbol TSTG TSLD(1) VIO VCC IO PD
Absolute maximum ratings
Parameter Storage temperature (VCC Off) Lead solder temperature for 10 seconds Input or output voltage Supply voltage Output current Power dissipation Value -55 to 150 260 -0.3 to VCC + 0.3 -0.3 to 7.0 20 320 Unit C C V V mA mW
1. Reflow at peak temperature of 260C (total thermal budget not to exceed 245C for greater than 30 seconds).
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STM6315
DC and AC parameters
5
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 VCC Supply Voltage Ambient Operating Temperature (TA) 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 0.8VCC 0.3 to 0.7VCC Unit V C ns V V
Figure 13. AC testing input/output waveforms
0.8VCC
0.7VCC 0.3VCC
AI02568
0.2VCC
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DC and AC parameters Table 4.
Sym VCC
STM6315
DC and AC characteristics
Description Test Condition (1) Min 1.0 VCC = 5.5V, no load TA = -40 to +85C VCC = 5.5V, no load TA = -40 to +125C VCC = 3.6V, no load TA = -40 to +85C VCC = 3.6V, no load TA = -40 to +125C VCC > 4.25V, ISINK = 3.2mA 1.5 2.0 Typ Max 5.5 12 15 10 12 0.4 0.3 0.3 1 Unit V A A A A V V V A
Operating voltage
ICC
VCC supply current
VOL
RST output voltage
VCC > 2.5V, ISINK = 1.2mA VCC > 1.0V, ISINK = 80A
RST output open drain Leakage Current Reset Thresholds Reset threshold (2) VRST (see Table 6 on page 18 for detailed listing)
VCC > VRST, RST not asserted
VCC falling; TA = 25C VCC falling; TA = -40 to 85C
VRST - 1.8%
VRST + 1.8%
V V V s
VRST - 2.5% VRST VRST + 2.5% VRST + 3.5% 35 1 1.5 0.8 20 30 16 140 210 112 1120 1680 896 60 2688 336 2240 48 280 2.4 40 2
VCC falling; TA = -40 to 125C VRST - 3.5% VCC falling from (VRST + 100mV) to (VRST - 200mV) at 1mV/s TA = -40 to +85C TA = -40 to +125C
tRD
VCC-to-RST delay
ms ms ms ms ms ms ms ms ppm/C
STM6315xAxxxx
STM6315xBxxxx trec RST pulse width (2) STM6315xDxxxx
TA = -40 to +85C TA = -40 to +125C TA = -40 to +85C TA = -40 to +125C
STM6315xGxxxx Reset threshold temperature coefficient
TA = -40 to +85C TA = -40 to +125C
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STM6315 Table 4.
Sym
DC and AC parameters DC and AC characteristics (continued)
Description Test Condition (1) Min Typ Max Unit
Manual Reset Input VIL MR low input threshold VRST > 4.0V VRST < 4.0V MR low input threshold MR input pulse width MR glitch rejection MR-to-RST delay MR pull-up resistance 32 VRST > 4.0V VRST < 4.0V 1 100 500 63 100 0.8 0.3VCC 2.4 0.7VCC V V V V s ns ns k
VIH
1. Valid for ambient operating temperature: TA = -40 to 125C; VCC = 2.5 to 5.5V (except where noted). 2. Other VRST thresholds and trec timings are offered. Minimum order quantities may apply. Contact local sales office for availability.
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Package mechanical data
STM6315
6
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.
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STM6315
Package mechanical data
Figure 14. SOT143-4 - 4-lead small outline transistor package outline
E E1
B 0.15
M
CAB
A1
1
e1
e/2 e D
0.15
M
CAB
b2
0.20
M
CAB A
4X
C 0.10 C
A2 A
3X b C
L1 L
C
SOT143-4
Note:
Drawing is not to scale. Table 5.
Symbol Typ A A1 A2 b b2 C D E E1 e e1 L L1 N - - - - - - - - - 1.92 0.20 0.55 - Min 0.89 0.01 0.88 0.37 0.76 0.09 2.80 2.10 1.20 - - - 0.40 0 4 Max 1.12 0.10 1.02 0.51 0.94 0.18 3.04 2.64 1.40 - - - 0.60 10 Typ - - - - - - - - - 0.076 0.008 0.022 - Min 0.035 0.001 0.035 0.015 0.030 0.004 0.110 0.083 0.047 - - - 0.016 0 4 Max 0.044 0.004 0.042 0.020 0.037 0.007 0.120 0.104 0.055 - - - 0.024 10
SOT143-4 - 4-lead small outline transistor package mechanical data
mm inches
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Part numbering
STM6315
7
Part numbering
Table 6.
Example:
Ordering information scheme
STM6315 R D W1 3 F
Device Type STM6315
Reset Threshold Voltage (1) L = VRST = 4.63V M = VRST = 4.38V S = VRST = 2.93V R = VRST = 2.63V RST Pulse Width (1) A = trec = 1.5ms B = trec = 30ms D = trec = 210ms G = trec = 1680ms
Package W1 = SOT143-4
Temperature Range 3 = -40 to 125C
Shipping Method F = ECOPACK Package, Tape & Reel
1. Other VRST thresholds and trec timings are offered. Minimum order quantities may apply. Contact local sales office for availability.
Note:
For other options, or for more information on any aspect of this device, please contact the ST Sales Office nearest you.
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STM6315 Table 7. Marking description
Reset Threshold (1) (V) 4.63 4.38 2.93 2.63 2.63 2.63 2.63 RST Pulse Width (1) (ms) 30 210 210 1.5 30 210 1680 Output Open drain RST Open drain RST Open drain RST Open drain RST Open drain RST Open drain RST Open drain RST
Part numbering
Part Number STM6315LB STM6315MD STM6315SD STM6315RA STM6315RB STM6315RD STM6315RG
Topside Marking (2) 9LBx 9MDx 9SDx 9RAx 9RBx 9RDx 9RGx
1. Other VRST thresholds and trec 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.
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Revision history
STM6315
8
Revision history
Table 8.
Date 14-Nov-2005 08-Feb-2006 12-Apr-2006 27-Jul-2006 21-Mar-2007
Document revision history
Revision 1.0 2.0 3 4 5 First edition. Update template, characteristics, marking (Figure 7, 8, 9, 10, and 11; Table 4, 6, and 7). Updated characteristics (Figure 7, 8, and 11; Table 4, 6, and 7). Updated Table 3, 5 and 6. Updated Table 2, 6, and 7. Changes
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STM6315
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