R
EM MICROELECTRONIC -
MARIN SA
V6309
V6319
3-Pin Microprocessor Reset Circuit
Description
The V6309 and V6319 are microprocessor supervisory
circuits used to monitor the power supplies in µP and digital
systems. They provide excellent circuit reliability and low
cost by eliminating external components and adjustments
when used with 5V powered or 3V powered circuits.
These circuits perform a single function: they assert a reset
signal whenever the V
DD
supply voltage declines below a
preset threshold, keeping it asserted for at least 140ms after
V
DD
has risen above the reset threshold. The only difference
between the two devices is that the V6309 has an active-low
RESET output (which is guaranteed to be in the correct
state for V
DD
down to 1V), while the V6319 has an active-
high RESET output. The reset comparator is designed to
ignore fast transients on V
DD
. Reset thresholds suitable for
operation with a variety of supply voltages are available.
Low supply current makes the V6309/V6319 ideal for use in
portable equipment. The V6309/V6319 come in a 3-pin
SOT23 package.
Features
Precision monitoring of 3V, 3.3V and 5V power supply
voltages
Fully specified over the temperature range of
-40 to +125°C
140ms minimum power-on reset pulse width:
RESET output for V6309
RESET output for V6319
16 µA supply current
Guaranteed RESET/RESET valid to V
DD
= 1V
Power supply transient immunity
No external components needed
3-pin SOT23 package
Fully compatible with MAX809/MAX810
Applications
Computer
Controllers
Intelligent instruments
Critical µP and µC power monitoring
Portable/battery-powered equipment
Typical Operating Configuration
V
DD
V
DD
V6309
RES
V
DD
Micro-
processor
RES
Pin Assignment
SOT23-3L
V
DD
3
V6309/19
1
2
V
SS
V
SS
V
SS
RES / RES
Fig. 1
Fig. 2
Pin Description
Pin
1
2
Name
V
SS
for V6309
Function
Ground
RESET
2
for V6319
RESET
VDD
RESET
Output remains low while
V
DD
is below the reset threshold and
rises for 240ms after V
DD
above the
reset threshold
RESET Output remains high while
V
DD
is below the reset threshold and
rises for 240ms after V
DD
above the
reset threshold
Supply voltage (+5V, +3.3V or
+3.0V)
Table 1
3
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R
V6309
V6319
Absolute Maximum Ratings
Parameter
Terminal voltage to V
SS
Min. voltage at RESET or
RESET
Maximum voltage at RESET or
RESET
Input current at V
DD
Output current at RESET or
RESET
Rate of rise at V
DD
Continuous power dissipation at
T
A
= +70°C for SOT-23
(>70°C derate by 4 mW/°C)
Operating temperature range
Storage temperature range
Symbol
Conditions
V
DD
-0.3V to + 6.0V
V
min
V
max
I
min
I
max
t
R
P
max
T
A
T
ST
-0.3V
V
CC
+ 0.3V
20 mA
20 mA
100Vµs
320 mW
-40 to +125°C
-65°C to +150°C
Table 2
Stresses above these listed maximum ratings may cause
permanent damages to the device. Exposure beyond
specified operating conditions may affect device reliability or
cause malfunction.
Handling Procedures
This device has built-in protection against high static
voltages or electric fields; however, it is advised that normal
precautions be taken as for any other CMOS component.
Unless otherwise specified, proper operation can only occur
when all terminal voltages are kept within the voltage range.
Electrical Characteristics
V
DD
= full range, T
A
= -40 to +125°C, unless otherwise specified, typical values at T
A
= +25°C, V
DD
= 5V for versions L and M,
V
DD
= 3.3V for versions T and S, V
DD
= 3 V for R. (Production testing done at T
A
= +25°C and 85°C, over temperature limits
guaranteed by design only)
Parameter
V
DD
range
Supply current
versions L, M
versions R, S, T
1)
RESET threshold
version L
version M
version T
version S
version R
Reset threshold temp. coefficient
1)
V
DD
to reset delay
Reset active timeout period
RESET output voltage low for V6309
versions R, S, T
versions L, M
RESET output voltage high for V6309
versions R, S, T
versions L, M
RESET output voltage low for V6319
versions R, S, T
versions L, M
RESET output voltage high for V6319
Symbol
V
DD
Test Conditions
T
A
= 0 to +70°C
T
A
= -40 to +105C
T
A
= -40 to +125°C
V
DD
< 5.5V
V
DD
< 3.6V
T
A
= +25°C
T
A
= -40 to +125°C
T
A
= +25°C
T
A
= -40 to +125°C
T
A
= +25°C
T
A
= -40 to +125°C
T
A
= +25°C
T
A
= -40 to +125°C
T
A
= +25°C
T
A
= -40 to +125°C
V
DD
= V
TH
to (V
TH
– 100mV)
T
A
= -40 to °125°C
Min.
1.0
1.2
1.6
Typ.
Max.
5.5
5.5
5.5
60
50
4.70
4.79
4.45
4.53
3.11
3.17
2.96
3.02
2.66
2.72
Unit
V
V
V
µA
µA
V
V
V
V
V
V
V
V
V
V
ppm/°C
µs
ms
V
V
V
V
V
I
CC
V
TH
26
16
4.56
4.40
4.31
4.16
3.04
2.92
2.89
2.78
2.59
2.50
4.63
4.38
3.08
2.93
2.63
-200
7
330
140
590
0.3
0.3
0.4
V
OL
V
DD
> 1.0V, I
SINK
= 50µA
V
DD
= V
TH
min., I
SINK
= 1.2mA
V
DD
= V
TH
min., I
SINK
= 3.2mA
V
DD
= V
TH
max., I
SOURCE
= 500µA
V
DD
= V
TH
max., I
SOURCE
= 800µA
V
DD
= V
TH
max., I
SINK
= 1.2mA
V
DD
= V
TH
max., I
SINK
= 3.2mA
1.8V < V
DD
< V
TH
min.,
I
SOURCE
= 150µA
0.8 V
DD
V
DD
-1.5V
V
OH
V
OL
V
OH
0.3
0.4
0.8 V
DD
V
V
V
Table 3
1)
RESET output for V6309 , RESET output for V6319
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R
V6309
V6319
Supply Current vs Temperature
No load, V63xxR/S/T
Power-Down Reset Delay vs Temperature
V63xxR/S/T
Fig. 3
Fig. 6
Supply Current vs Temperature
No load, V63xxL/M
Power-Down Reset Delay vs Temperature
V63xxL/M
Fig. 4
Fig. 7
Power-Up Reset Timeout vs Temperature
All versions
Normalized Reset Threshold vs Temperature
All versions
Fig. 5
Fig. 8
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V6309
V6319
Application Information
Negative-Going V
DD
Transients
In addition to issuing a reset to the microprocessor during
power-up, power-down and brownout conditions, the
V6309/V6319 are relatively immune to short duration
negative-doing V
DD
transients (glitches). Fig. 8 shows
typical transient duration vs. Reset comparator overdrive,
for which the V6309/V6319 do not generate a reset pulse.
The graph was generated using a negative-going pulse
applied to V
DD
, starting 0.5V above the actual reset
threshold and ending below it by the magnitude indicated
(reset comparator overdrive). The graph indicates the
maximum pulse width a negative-going V
DD
transient can
have without causing a reset pulse. As the magnitude of
the transient increases (goes farther below the reset
threshold), the maximum allowable pulse width decreases.
Typically, for the V6309L and V6319M, a V
DD
transient that
goes 100V below the reset threshold and lasts 20µs or less
will not cause a reset pulse. A 0.1µF bypass capacitor
mounted as close as possible to the V
DD
pin provides
additional transient immunity.
Max. Transient Duration without causing a Reset Pulse
versus Reset Comparator Overdrive
RESET Valid for V
DD
= Ground Circuit
V
DD
RES
V6309
V
SS
100 kΩ
Fig. 10
Interfacing to µPs with Bidirectional Reset Pins
Microprocessors with bidirectional reset pins (such as the
Motorola 68HC11 series) can connect to the V6309 reset
output. If, for example, the V6309
RESET
output is
asserted high and the µP wants to pull it low, indeterminate
logic levels may result. To correct this, connect a 4.7 k
Ω
resistor between the V6309
RESET
and the µP reset I/O
(Fig. 11). Buffer the V6309
RESET
output to other system
components.
Interfacing to µPs with Bidirectional Reset I/O
Buffer RES to
other system
components
Buffer
V
DD
V
DD
RES
V6309
4.7 kO
4.7k
Ω
RES
µP
V
SS
Fig .9
Ensuring a Valid Reset Output down to V
DD
= 0V
When V
DD
falls below 1V, the V6309
RESET
output no
longer sinks current, it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs connected
to
RESET
can drift to undetermined voltages. This
presents no problem in most applications, since most µP
and other circuitry is inoperative with V
DD
below 1V.
However, in applications where
RESET
must be valid
down to 0V, adding a pull-down resistor to
RESET
causes
any stray leakage currents to flow to ground, holding
RESET
low (Fig. 10). R1's value is not critical; 100 k
Ω
is
large enough not to load
RESET
and small enough to pull
RESET
to ground. A 100 k
Ω
pull-up resistor to V
DD
is also
recommended for the V6319, if RESET is required to
remain valid for V
DD
< 1V.
V
SS
Fig. 11
Benefits of Highly Accurate Reset Threshold
Most µP supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal supply
voltages. This ensures a reset will not occur within 5% of
the nominal supply, but will occur when the supply is 10%
below nominal. When using ICs rated at only the nominal
supply ±5%, this leaves a zone of uncertainty where the
supply is between 5% and 10% low, and where the reset
may or may not be asserted.
The V6209/T and V6319/T use highly accurate circuitry to
ensure that reset is asserted close to the 5% limit, and long
before the supply has declined to 10% below nominal.
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V6309
V6319
Packaging and Ordering Information
Dimensions of SOT23-3L Package
D
A1 A2 A
SOT23-3L
E
C
L
B
H
e
SYMBOL
A
A1
A2
B
C
D
E
e
e1
H
L
MIN
0.89
0.013
0.95
0.37
0.085
2.80
1.20
1.78
2.10
e1
TYP MAX
1.04 1.12
0.10
0.97 1.00
0.51
0.12 0.18
2.95 3.04
1.32 1.40
0.95
1.90 2.05
2.40 2.64
0.55
Dimensions are in mm
Ordering Information
When ordering, please always specify the complete Part Number. Please contact EM Microelectronic for availability.
Part Number
V6309RSP3B
V6309SSP3B
V6309TSP3B
V6309MSP3B
V6309LSP3B
V6319RSP3B
V6319SSP3B
V6319TSP3B
V6319MSP3B
V6319LSP3B
1)
2)
Threshold
Voltage
2.63V
2.93V
3.08V
4.38V
4.63V
2.63V
2.93V
3.08V
4.38V
4.63V
Output Type
Package &
Delivery Form
SOT23-3L,
Tape & Reel
3000 pces
Active low
push-pull
Active high
push-pull
SOT23-3L,
Tape & Reel
3000 pces
Top Marking
1)
with 4 Characters
AEAR
AEAS
AEAT
AEAM
AEAL
AFAR
AFAS
AFAT
AFAM
AFAL
Top Marking
2)
with 3 Characters
ER#
ES#
ET#
EM#
EL#
FR#
FS#
FT#
FM#
FL#
Top marking with 4 characters is standard from 2003. For lead-free/green mold (RoHS) parts, the first letter of top marking
with 4 characters begins with letter "B" instead of letter "A".
Top marking with 3 characters is kept as information since it was used until 2002. Where # refers to the lot number (EM
internal reference only)
RoHS Compliance Information
This product is also available in a lead-free/green mold package. Please add a "+" symbol at the end of the Part Number when
ordering to receive a lead-free equivalent (eg. V6309LSP3B+). Top marking of lead-free/green mold V6309 parts always begins
with letter "B" instead of "A".
Traceability for Small Packages
Due to the limited space on the package surface, the bottom marking contains a limited number of characters that provide only
partial information for lot traceability. Full information for complete traceability is however provided on the packing labels of the
product at delivery from EM. It is highly recommended that the customer insures full lot traceability of EM product in his final
product.
EM Microelectronic-Marin SA (EM) makes no warranty for the use of its products, other than those expressly contained in the Company's
standard warranty which is detailed in EM's General Terms of Sale located on the Company's web site. EM assumes no responsibility for
any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without
notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property
of EM are granted in connection with the sale of EM products, expressly or by implications. EM's products are not authorized for use as
components in life support devices or systems.
©
EM Microelectronic-Marin SA, 02/05, Rev. F
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