EM MICROELECTRONIC
- MARIN SA
Reset Circuit with Manual Reset
Description
The EM6325 is an ultra-low current reset circuit available in a
large variety of configurations and very small packages for
maximum flexibility in all end-applications up to 125°C and
using power supplies between 1.5V and 5.5V.
This circuit monitors the supply voltage of any electronic
system, and generates the appropriate reset signal after a
fixed reset timeout period. The threshold defines the
minimum allowed voltage which guarantees the good
functionality of the system. When V
DD
rises above V
TH
, the
output remains active for an additional delay time. This
allows the system to stabilize before getting fully active.
This circuit features a Manual Reset: an input that asserts
reset when pulled low (
MR
with internal pull-up).
Small SC70-4L, SC70-5L and SOT23-5L packages as well
as ultra-low supply current of 2.9μA make the EM6325 an
ideal choice for portable and battery-operated devices.
EM6325
Features
Manual reset function
200ms reset timeout period (1.6ms, 25ms, 1600ms on
request)
Ultra-low supply current of 2.9μA (V
DD
=3.3V)
Operating temperature range: -40°C to +125°C
±1.5%
reset threshold accuracy
11 reset threshold voltages V
TH
: 4.63V, 4.4V, 3.08V,
2.93V, 2.63V, 2.2V, 1.8V, 1.66V, 1.57V, 1.38V, 1.31V
3 reset output options:
Active-low
RESET
push-pull
Active-low
RESET
open-drain
Active-high
RESET
push-pull
Immune to short negative V
DD
transients
Guaranteed Reset valid down to 0.9V
Threshold hysteresis: 2.1% of V
TH
Very small SOT23-5L, SC70-5L and SC70-4L
Typical Application
V
DD
V
DD
RESET
*
V
DD
RESET
Applications
Computers
Servers and workstations
Modems
Wireless communication
Metering
Playstations
PDA , Webpad
Automotive systems
EM6325
MR
RESET
GND
MPU, DSP
RESET
GND
GND
*
R
EXT
for open-drain version only
Block Diagram
V
DD
Oscillator
Pin Configuration
(top view)
RESET
RESET
push-pull / open-drain
+
Voltage
Reference
-
Reset
Logic
RESET
1
2
3
5
V
DD
GND
RESET
(RESET)
1
2
4
3
V
DD
MR
GND
RESET
push-pull
MR
GND
Filter
4
MR
SOT23-5 / SC70-5
top view
SC70-4
top view
Pin Description
Pin
SOT23-5L / SC70-5L
1
SC70-4L
2
Name
Function
Active-low RESET output. RESET remains low for the reset timeout period and
RESET
2
3
1
2
GND
RESET
then goes high after all reset conditions are deasserted or after
MR goes from low
to high
Ground
Active-high RESET output. RESET remains high for the reset timeout period and
then goes low after all reset conditions are deasserted or after
MR
goes from low to
high
Manual Reset input with an internal pull-up 15k
Ω
resistor. Reset remains active as
long as MR is low and for t
POR
after MR returns high. MR can be driven with a
CMOS output or shorted to ground with a switch
Supply Voltage (5.5V max.)
4
5
3
4
MR
V
DD
Copyright
©
2005, EM Microelectronic-Marin SA
1
www.emmicroelectronic.com
EM6325
Ordering Information
EM6325 C X SP5B - 2.9 +
Delay (t
POR
):
C = 200ms
A = 1.6ms
B = 25ms
D = 1600ms
RoHS Compliance:
+ = lead-free/green mold compliant
[blank]
= leaded
Reset Threshold Voltage (V
TH
):
1.3 = 1.31V
2.6 = 2.63V
1.4 = 1.38V
2.9 = 2.93V
1.6 = 1.57V
3.1 = 3.08V
1.7 = 1.66V
4.4 = 4.40V
1.8 = 1.80V
4.6 = 4.63V
2.2 = 2.20V
Reset Output Type:
X = Active-low /RES push-pull
Active-high RES push-pull
Y = Active-low /RES open-drain
Active-high RES push-pull
Z = Active-high RES push-pull
Package:
SP5B = SOT23-5, Tape&Reel 3000 pcs
SC5B = SC70-5, Tape&Reel 3000 pcs
SC4B = SC70-4, Tape&Reel 3000 pcs
Top Marking
Package top marking below is for most parts in leaded package (first letter is “A”). For lead-free/green mold (RoHS) parts,
the first letter of top marking begins with letter “B” instead of letter “A”. The underscore "_ _" refers to the four-letter code for
the package (eg. SP5B, SC4B, …).
Part Number
EM6325AX__-1.3
EM6325AX__-1.4
EM6325AX__-1.6
EM6325AX__-1.7
EM6325AX__-1.8
EM6325AX__-2.2
EM6325AX__-2.6
EM6325AX__-2.9
EM6325AX__-3.1
EM6325AX__-4.4
EM6325AX__-4.6
EM6325AY__-1.3
EM6325AY__-1.4
EM6325AY__-1.6
EM6325AY__-1.7
EM6325AY__-1.8
EM6325AY__-2.2
EM6325AY__-2.6
EM6325AY__-2.9
EM6325AY__-3.1
EM6325AY__-4.4
EM6325AY__-4.6
Top
Marking
ANAA
ANAB
ANAC
ANAD
ANAE
ANAF
ANAG
ANAH
ANAJ
ANAK
ANAL
ANAM
ANAN
ANAP
ANAQ
ANAR
ANAS
ANAT
ANAU
ANAV
ANAW
ANAX
Part Number
EM6325BX__-1.3
EM6325BX__-1.4
EM6325BX__-1.6
EM6325BX__-1.7
EM6325BX__-1.8
EM6325BX__-2.2
EM6325BX__-2.6
EM6325BX__-2.9
EM6325BX__-3.1
EM6325BX__-4.4
EM6325BX__-4.6
EM6325BY__-1.3
EM6325BY__-1.4
EM6325BY__-1.6
EM6325BY__-1.7
EM6325BY__-1.8
EM6325BY__-2.2
EM6325BY__-2.6
EM6325BY__-2.9
EM6325BY__-3.1
EM6325BY__-4.4
EM6325BY__-4.6
Top
Marking
ANBA
ANBB
ANBC
ANBD
ANBE
ANBF
ANBG
ANBH
ANBJ
ANBK
ANBL
ANBM
ANBN
ANBP
ANBQ
ANBR
ANBS
ANBT
ANBU
ANBV
ANBW
ANBX
Part Number
EM6325CX__-1.3
EM6325CX__-1.4
EM6325CX__-1.6
EM6325CX__-1.7
EM6325CX__-1.8
EM6325CX__-2.2
EM6325CX__-2.6
EM6325CX__-2.9
EM6325CX__-3.1
EM6325CX__-4.4
EM6325CX__-4.6
EM6325CY__-1.3
EM6325CY__-1.4
EM6325CY__-1.6
EM6325CY__-1.7
EM6325CY__-1.8
EM6325CY__-2.2
EM6325CY__-2.6
EM6325CY__-2.9
EM6325CY__-3.1
EM6325CY__-4.4
EM6325CY__-4.6
Top
Marking
ANCA
ANCB
ANCC
ANCD
ANCE
ANCF
ANCG
ANCH
ANCJ
ANCK
ANCL
ANCM
ANCN
ANCP
ANCQ
ANCR
ANCS
ANCT
ANCU
ANCV
ANCW
ANCX
Part Number
EM6325DX__-1.3
EM6325DX__-1.4
EM6325DX__-1.6
EM6325DX__-1.7
EM6325DX__-1.8
EM6325DX__-2.2
EM6325DX__-2.6
EM6325DX__-2.9
EM6325DX__-3.1
EM6325DX__-4.4
EM6325DX__-4.6
EM6325DY__-1.3
EM6325DY__-1.4
EM6325DY__-1.6
EM6325DY__-1.7
EM6325DY__-1.8
EM6325DY__-2.2
EM6325DY__-2.6
EM6325DY__-2.9
EM6325DY__-3.1
EM6325DY__-4.4
EM6325DY__-4.6
Top
Marking
ANDA
ANDB
ANDC
ANDD
ANDE
ANDF
ANDG
ANDH
ANDJ
ANDK
ANDL
ANDM
ANDN
ANDP
ANDQ
ANDR
ANDS
ANDT
ANDU
ANDV
ANDW
ANDX
Standard Versions, Samples
Sample stock is generally held on
standard versions
(below) only. Non standard versions have a 30,000 pieces minimum
order quantity. Please contact factory for other versions not shown here and for availability of non standard versions.
EM6325AXSC4B-2.9
EM6325CXSC5B-2.9
EM6325CXSP5B-1.3
EM6325CXSP5B-2.6
EM6325CXSP5B-2.9
EM6325CXSP5B-3.1
EM6325CYSP5B-2.9
EM6325CYSP5B-4.6
EM6325DXSC4B-2.6
EM6325CXSP5B-4.6
Copyright
©
2005, EM Microelectronic-Marin SA
2
www.emmicroelectronic.com
EM6325
Absolute Maximum Ratings
Parameter
Voltage at V
DD
to GND
Minimum voltage at any signal pin
Maximum voltage at any signal pin
Electrostatic discharge max. to
MIL-STD-883C method 3015.7
with ref. to V
SS
Max. soldering conditions
Storage Temperature Range
Handling Procedures
Symbol
V
DD
V
MIN
V
MAX
V
ESD
T
MAX
T
STG
Conditions
-0.3V to +6V
GND - 0.3V
V
DD
+ 0.3V
2000V
250°C x 10s
-65°C to +150°C
This device has built-in protection against high static
voltages or electric fields; however, anti-static
precautions must 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. Unused inputs must
always be tied to a defined logic voltage level.
Operating Conditions
Parameter
Supply voltage
Operating Temperature
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.
Symbol Min Max Unit
V
DD
T
A
0.9
-40
5.5
+125
V
°C
Electrical Characteristics
Unless otherwise specified: V
DD
= 0.9V to 5.5V, T
A
=-40°C to +125°C (note 1).
Parameter
Symbol
Conditions
+25°C
-40°C to +125°C
+25°C
V
DD
=3.3V
-40°C to +125°C
+25°C
V
DD
=5.0V
-40°C to +125°C
+25°C
EM6325 – 1.3
-40°C to +85°C
-40°C to +125°C
+25°C
EM6325 – 1.4
-40°C to +85°C
-40°C to +125°C
+25°C
EM6325 – 1.6
-40°C to +85°C
-40°C to +125°C
+25°C
EM6325 – 1.7
-40°C to +85°C
-40°C to +125°C
+25°C
EM6325 – 1.8
-40°C to +85°C
-40°C to +125°C
+25°C
EM6325 – 2.2
-40°C to +85°C
-40°C to +125°C
+25°C
EM6325 – 2.6
-40°C to +85°C
-40°C to +125°C
+25°C
EM6325 – 2.9
-40°C to +85°C
-40°C to +125°C
+25°C
EM6325 – 3.1
-40°C to +85°C
-40°C to +125°C
+25°C
EM6325 – 4.4
-40°C to +85°C
-40°C to +125°C
+25°C
EM6325 – 4.6
-40°C to +85°C
-40°C to +125°C
T
A
=+25°C
V
DD
=1.5V
Min
-
-
-
-
-
-
1.290
1.245
1.221
1.359
1.311
1.286
1.546
1.492
1.463
1.635
1.577
1.547
1.773
1.710
1.678
2.167
2.090
2.050
2.591
2.499
2.451
2.886
2.784
2.731
3.034
2.926
2.871
4.334
4.180
4.101
4.561
4.399
4.315
-
Typ
2.3
2.9
3.4
1.31
Max
4.6
7
5.5
8.3
6.3
9.6
1.330
1.382
1.387
1.401
1.456
1.461
1.594
1.656
1.663
1.685
1.751
1.758
1.827
1.899
1.906
2.233
2.321
2.330
2.669
2.775
2.785
2.974
3.091
3.103
3.126
3.249
3.262
4.466
4.642
4.660
4.699
4.885
4.903
-
Unit
Supply current (note 2)
I
DD
μ
A
1.38
1.57
1.66
1.80
Threshold voltage
(note 3)
V
TH
2.20
V
2.63
2.93
3.08
4.40
4.63
2.1%
•
V
TH
Threshold hysteresis
V
HYS
V
Note 1:
Production tested at +25°C only. Over temperature limits are guaranteed by design, not production tested.
Note 3:
Threshold voltage is specified for V
DD
falling.
Copyright
©
2005, EM Microelectronic-Marin SA
3
www.emmicroelectronic.com
EM6325
Electrical Characteristics
(continued)
Unless otherwise specified: V
DD
= 0.9V to 5.5V, T
A
=-40°C to +125° C (note 1).
Parameter
Symbol
Conditions
EM6325C
Reset timeout period
t
POR
(note 2 and 4)
V
DD
from 0V to V
TH (typ)
+15%
T
A
= +25°C
EM6325A
EM6325B
EM6325D
Propagation delay time
V
DD
to RESET (RESET) delay
Open-drain
RESET
output
Voltage
t
P
V
DD
drops from V
TH (typ)
+0.2V to V
TH (typ)
-0.2V
(note 2). T
A
= +25°C
V
DD
>1V
V
OL
V
DD
>2.5V
V
DD
>5V
V
DD
>1V
V
OL
Push-pull RESET / RESET
Output voltage
V
OH
Output leakage current
MANUAL RESET (
MR
)
MR Input low
MR Input high
MR to Reset delay
Pulse width at MR (note 5)
MR Internal Pull-up resistor
V
MRT
low
V
MRT
high
t
MD
t
PMD
R
MR
T
A
=-40°C to +125°C
T
A
= +25°C
0.7
•
V
DD
0.3
1
4.8
15
31
0.3
•
V
DD
V
V
μ
s
μ
s
Min
155
0.7
19.4
1240
2
-
-
-
-
-
-
0.8
2
4
-
Typ
200
1.6
25
1600
130
-
-
-
-
-
-
-
-
-
-
Max
224
3.8
28
1792
255
0.3
0.3
0.35
0.3
0.3
0.35
-
-
-
0.5
Unit
ms
μ
s
I
OL
=100
μ
A
I
OL
=1.5mA
I
OL
=3mA
I
OL
=100
μ
A
I
OL
=1.5mA
I
OL
=3mA
I
OH
=-30
μ
A
I
OH
=-1.5mA
I
OH
=-3mA
V
V
DD
>2.5V
V
DD
>5V
V
DD
>1V
V
DD
>2.5V
V
DD
>5V
V
I
LEAK
Only for EM6325_Y (open-drain)
μ
A
k
Ω
Note 1:
Production tested at +25°C only. Over temperature limits are guaranteed by design, not production tested.
Note 2:
RESET (RESET)
open.
Note 4:
Standard version for t
POR
is 200ms (typ), available at all times. Other option (1.6ms, 25ms, 1600ms) are available
by mask option and upon minimum order quantity. Please contact EM sales.
Note 5:
Pulse width must be greater than 1μs to ensure the
RESET
(RESET)
to go active.
Copyright
©
2005, EM Microelectronic-Marin SA
4
www.emmicroelectronic.com
EM6325
Timing Waveforms
V
DD
V
TH
t
SEN
V
HYS
Overdrive
0.8V
t
logic "1"
MR
logic "0"
t
logic "1"
RESET
logic "0"
t
logic "1"
RESET
logic "0"
t
t
POR
t
POR
t
MD
t
P
t
PMD
Note 6:
t
SEN
= Maximum Transient Duration. Please refer to figure on the next page.
Note 7:
Overdrive = V
TH
-V
DD
. Please refer to figure on the next page.
Manual Reset Input
A logic low on
MR
asserts a reset. Reset remains asserted while
MR
is low, and for t
POR
(200ms nominal for EM6325C) after
it returns high.
MR
has an internal 15kΩ pull-up resistor, so it can be left open if unused. This input can be driven with
CMOS logic levels or with open-drain outputs. Connect a normally open momentary switch from
MR
to V
SS
to create a
manual-reset function; debounce circuitry is integrated. If
MR
is driven from long cable or the device is used in a noisy
environment, connect a 0.1μF capacitor from
MR
to V
SS
to provide additional noise immunity (stronger external additional
pull-up resistor can also be added).
Copyright
©
2005, EM Microelectronic-Marin SA
5
www.emmicroelectronic.com
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