R
V6309
V6319
Copyright 2006, EM Microelectronic-Marin SA
03/06 rev.G
1
www.emmicroelectronic.com
3-Pin Microprocessor Reset Circuit
Description
The V6309 and V6319 are microprocessor supervisory
circuits used to monitor the power supplies in P 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 +125C
!
140ms minimum power-on reset pulse width:
RESET output for V6309
RESET output for V6319
!
16 A 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 P and C power monitoring
!
Portable/battery-powered equipment
Typical Operating Configuration
Micro-
processor
V
DD
V
DD
V
SS
V
SS
RES
V
DD
RES
V6309
Fig. 1
Pin Assignment
V6309/19
3
2
1
V
DD
V
SS
RES / RES
SOT23-3L
Fig. 2
Pin Description
Pin Name
Function
1 V
SS
Ground
2 for
V6309
RESET
RESET
Output remains low while
V
DD
is below the reset threshold and
rises for 240ms after V
DD
above the
reset threshold
2 for
V6319
RESET
RESET Output remains high while
V
DD
is below the reset threshold and
rises for 240ms after V
DD
above the
reset threshold
3
VDD
Supply voltage (+5V, +3.3V or
+3.0V)
Table 1
EM MICROELECTRONIC -
MARIN SA
R
V6309
V6319
Copyright 2006, EM Microelectronic-Marin SA
03/06 rev.G
2
www.emmicroelectronic.com
Absolute Maximum Ratings
Parameter Symbol
Conditions
Terminal voltage to V
SS
V
DD
-0.3V to + 6.0V
Min. voltage at RESET or
RESET
V
min
-0.3V
Maximum voltage at RESET or
RESET
V
max
V
CC
+ 0.3V
Input current at V
DD
I
min
20
mA
Output current at RESET or
RESET
I
max
20
mA
Rate of rise at V
DD
t
R
100Vs
Continuous power dissipation at
T
A
= +70C for SOT-23
(>70C derate by 4 mW/C)
P
max
320
mW
Operating temperature range
T
A
-40 to +125C
Storage temperature range
T
ST
-65C to +150C
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 +125C, unless otherwise specified, typical values at T
A
= +25C, 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
= +25C and 85C, over temperature limits
guaranteed by design only)
Parameter Symbol
Test
Conditions
Min.
Typ.
Max.
Unit
V
DD
range
V
DD
T
A
= 0 to +70C
1.0
5.5
V
T
A
= -40 to +105C
1.2
5.5
V
T
A
= -40 to +125C
1.6
5.5
V
Supply current
versions L, M
I
CC
V
DD
< 5.5V
26
60
A
versions R, S, T
V
DD
< 3.6V
16
50
A
RESET threshold
1)
version
L
V
TH
T
A
= +25C
4.56
4.63
4.70
V
T
A
= -40 to +125C
4.40
4.79
V
version
M
T
A
= +25C
4.31
4.38
4.45
V
T
A
= -40 to +125C
4.16
4.53
V
version
T
T
A
= +25C
3.04
3.08
3.11
V
T
A
= -40 to +125C
2.92
3.17
V
version
S
T
A
= +25C
2.89
2.93
2.96
V
T
A
= -40 to +125C
2.78
3.02
V
version
R
T
A
= +25C
2.59
2.63
2.66
V
T
A
= -40 to +125C
2.50
2.72
V
Reset threshold temp. coefficient
-200
ppm/C
V
DD
to reset delay
1)
V
DD
= V
TH
to (V
TH
100mV)
7
s
Reset active timeout period
T
A
= -40 to 125C
140
330
590
ms
RESET output voltage low for V6309
V
OL
V
DD
> 1.0V, I
SINK
= 50A
0.3
V
versions R, S, T
V
DD
= V
TH
min., I
SINK
= 1.2mA
0.3
V
versions L, M
V
DD
= V
TH
min., I
SINK
= 3.2mA
0.4
V
RESET output voltage high for V6309
versions R, S, T
V
OH
V
DD
= V
TH
max., I
SOURCE
= 500A 0.8
V
DD
V
versions L, M
V
DD
= V
TH
max., I
SOURCE
= 800A V
DD
-1.5V
V
RESET output voltage low for V6319
versions R, S, T
V
OL
V
DD
= V
TH
max., I
SINK
= 1.2mA
0.3
V
versions L, M
V
DD
= V
TH
max., I
SINK
= 3.2mA
0.4
V
RESET output voltage high for V6319
V
OH
1.8V < V
DD
< V
TH
min.,
I
SOURCE
= 150A
0.8 V
DD
V
Table 3
1)
RESET output for V6309 , RESET output for V6319
R
V6309
V6319
Copyright 2006, EM Microelectronic-Marin SA
03/06 rev.G
3
www.emmicroelectronic.com
Supply Current vs Temperature
No load, V63xxR/S/T
Fig. 3
Supply Current vs Temperature
No load, V63xxL/M
Fig. 4
Power-Up Reset Timeout vs Temperature
All versions
Fig. 5
Power-Down Reset Delay vs Temperature
V63xxR/S/T
Fig. 6
Power-Down Reset Delay vs Temperature
V63xxL/M
Fig. 7
Normalized Reset Threshold vs Temperature
All versions
Fig. 8
R
V6309
V6319
Copyright 2006, EM Microelectronic-Marin SA
03/06 rev.G
4
www.emmicroelectronic.com
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 20s or less
will not cause a reset pulse. A 0.1F 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
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 P
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
is
large enough not to load
RESET and small enough to pull
RESET to ground. A 100 k
pull-up resistor to V
DD
is also
recommended for the V6319, if RESET is required to
remain valid for V
DD
< 1V.
RESET Valid for V
DD
= Ground Circuit
V
DD
V
SS
RES
V6309
100 k
Fig. 10
Interfacing to Ps 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 P wants to pull it low, indeterminate
logic levels may result. To correct this, connect a 4.7 k
resistor between the V6309
RESET and the P reset I/O
(Fig. 11). Buffer the V6309
RESET output to other system
components.
Interfacing to Ps with Bidirectional Reset I/O
V
DD
V
DD
V
SS
V
SS
V6309
P
Buffer
4.7 kO
Buffer RES to
other system
components
RES
RES
Fig. 11
Benefits of Highly Accurate Reset Threshold
Most P 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.
4.7k
R
V6309
V6319
Copyright 2006, EM Microelectronic-Marin SA
03/06 rev.G
5
www.emmicroelectronic.com
Packaging and Ordering Information
Dimensions of SOT23-3L Package
Ordering Information
When ordering, please always specify the complete Part Number. Please contact EM Microelectronic for availability.
Part Number
Threshold
Voltage
Output Type
Package &
Delivery Form
Top Marking
1)
Top Marking
2)
with 4
Characters
Top Marking
3)
with 3
Characters
V6309RSP3B 2.63V
AEAR
ER#
V6309RSP3B+ 2.63V
EK##
BEAR
V6309SSP3B 2.93V
AT##
AEAS
ES#
V6309SSP3B+ 2.93V
BT##
BEAS
V6309TSP3B 3.08V
AEAT
ET#
V6309TSP3B+ 3.08V
EF##
BEAT
V6309MSP3B 4.38V
AEAM
EM#
V6309MSP3B+ 4.38V
E9##
BEAM
V6309LSP3B 4.63V
AEAL
EL#
V6309LSP3B+ 4.63V
Active low
push-pull
SOT23-3L,
Tape & Reel
3000 pces
E6## BEAL
V6319RSP3B 2.63V
AFAR
FR#
V6319SSP3B 2.93V
AFAS
FS#
V6319TSP3B 3.08V
AFAT
FT#
V6319MSP3B 4.38V
P0##
AFAM
FM#
V6319MSP3B+ 4.38V
E5##
BFAM
V6319LSP3B 4.63V
Active high
push-pull
SOT23-3L,
Tape & Reel
3000 pces
AFAL
FL#
1)
Top marking is the standard from 2006. No bottom marking exists. Where ## refers to the lot number (EM internal
reference only)
2)
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". Bottom marking indicates the lot number.
3)
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)
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.
Dimensions are in mm
L
C
e
e1
E
H
SOT23-3L
SYMBOL MIN TYP MAX
A
0.89 1.04 1.12
A1
0.013
0.10
A2
0.95 0.97 1.00
B
0.37
0.51
C
0.085 0.12 0.18
D
2.80 2.95 3.04
E
1.20 1.32 1.40
e
0.95
e1
1.78 1.90 2.05
H
2.10 2.40 2.64
L
0.55
A1 A2 A
D
B
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