EM MICROELECTRONIC
- MARIN SA
Reset Circuit with Fixed Delay
Description
The EM6353 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.
The EM6353 features three output types: active-low push-
pull, active-low open-drain and active-high push-pull.
Small SC70-5L and SOT23-3L packages as well as ultra-low
supply current of 2.9µA make the EM6353 an ideal choice
for portable and battery-operated devices.
EM6353
Features
!
!
!
!
!
!
200ms reset timeout period (25ms 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
No external components
Immune to short negative V
DD
transients
Guaranteed Reset valid down to 0.8V
Threshold hysteresis: 2.1% of V
TH
Very small SOT23-3L and SC70-5L packages
!
!
!
!
!
Typical Application
V
DD
V
DD
RESET
*
V
DD
RESET
Applications
!
!
!
!
!
!
!
!
3 GND
EM6353
GND
MPU, DSP
GND
GND
*
R
EXT
for open-drain version only
Pin Configuration
(top view)
GND
1
3
RESET 2
(RESET)
V
DD
V
DD
2
RESET 1
(RESET)
!
Mobile phones
Set-top boxes
Video, digital cameras, DVD players and recorders
Modems
Personal computers
Switching hubs
Copiers and fax
Utility meters
Automotive systems
SOT23-3L
"beta" bonding
NC
V
DD
NC
1
2
3
5 RESET
(RESET)
4 GND
SOT23-3L
"alpha" bonding
GND 4
RESET
5
(RESET)
3 NC
2 V
DD
1 NC
Block Diagram
V
DD
Oscillator
+
Voltage
Reference
(compatible with SC70-3 by rotating 180°)
SC70-5L
-
Reset
Logic
RESET
RESET
GND
Pin Description
Pin
SOT23-3L
“beta”
1
Function
SC70-5L
4
SOT23-3L
“alpha”
3
Name
GND
Ground
Active-low RESET output. RESET remains low for the reset timeout period
after all reset conditions are deasserted and then goes high.
Active-high RESET output. RESET remains high for the reset timeout period
after all reset conditions are deasserted and then goes low.
Supply Voltage (5.5V max.)
Not connected. Not internally connected.
RESET
2
1
5
RESET
3
-
2
-
2
1,3
V
DD
N.C.
Copyright
©
2006, EM Microelectronic-Marin SA
03/06 – rev.K
1
www.emmicroelectronic.com
EM6353
Ordering Information
EM6353 B X 2SP3B - 2.9 +
Delay (t
POR
):
B = 200ms
A = 25ms
Reset Output Type:
X = Active-low /RES push-pull
Y = Active-low /RES open-drain
Z = Active-high RES push-pull
Package & Bonding:
1SP3B = SOT23-3, "alpha", Tape&Reel 3kpcs
2SP3B = SOT23-3, "beta", Tape&Reel 3kpcs
SC5B = SC70-5, Tape&Reel 3kpcs
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
Note:
Subject to availability (see standard versions list below). Please give complete Part Number when ordering. All
parts are offered in tape-and-reel only (3000 units).
Standard Versions (Top Marking)
Part Number
EM6353BX1SP3B-1.3
EM6353BX1SP3B-2.6
EM6353BX1SP3B-2.6+
EM6353BX1SP3B-2.9
EM6353BX1SP3B-2.9+
EM6353BX1SP3B-4.4
EM6353BX1SP3B-4.4+
EM6353BX1SP3B-4.6
EM6353BX1SP3B-4.6+
EM6353BX2SP3B-1.3
EM6353BX2SP3B-1.8
EM6353BX2SP3B-1.8+
EM6353BX2SP3B-2.6
EM6353BX2SP3B-2.6+
EM6353BX2SP3B-2.9
EM6353BX2SP3B-2.9+
EM6353BX2SP3B-3.1
EM6353BX2SP3B-3.1+
EM6353BX2SP3B-4.4
EM6353BX2SP3B-4.4+
EM6353BX2SP3B-4.6
EM6353BX2SP3B-4.6+
EM6353BXSC5B-1.3
EM6353BXSC5B-1.8
EM6353BXSC5B-2.6
EM6353BXSC5B-2.6+
EM6353BXSC5B-2.9
EM6353BXSC5B-3.1
1)
Top Marking
Top
1)
2)
Marking
with 4
Characters
ALBA
ALBG
BLBG
ALBH
C1##
BLBH
ALBK
C2##
BLBK
ALBL
BLBL
ALWA
ALWE
BLWE
AW##
ALWG
BW##
BLWG
AR##
ALWH
BR##
BLWH
PC##
ALWJ
C5##
BLWJ
ALWK
C8##
BLWK
ALWL
BLWL
ALWA
ALWE
AW##
ALWG
BW##
BLWG
AR##
ALWH
PC##
ALWJ
Part Number
EM6353BXSC5B-3.1
EM6353BXSC5B-4.6
EM6353BY1SP3B-2.2
EM6353BY1SP3B-2.6
EM6353BY1SP3B-2.9
EM6353BY1SP3B-2.9+
EM6353BY1SP3B-3.1
EM6353BY1SP3B-4.4
EM6353BY1SP3B-4.6
EM6353BY2SP3B-2.6
EM6353BY2SP3B-2.6+
EM6353BY2SP3B-2.9
EM6353BY2SP3B-2.9+
EM6353BY2SP3B-3.1
EM6353BY2SP3B-3.1+
EM6353BY2SP3B-4.4
EM6353BY2SP3B-4.6
EM6353BY2SP3B-4.6+
EM6353BYSC5B-2.9
EM6353BYSC5B-2.9+
EM6353BYSC5B-4.4
EM6353BZ2SP3B-2.9
EM6353BZ2SP3B-2.9+
EM6353BZ2SP3B-3.1
EM6353BZ2SP3B-3.1+
EM6353BZ2SP3B-4.6
EM6353BZ2SP3B-4.6+
Top Marking
Top
1)
2)
Marking
with 4
Characters
C5##
BLWJ
ALWL
ALBS
ALBT
AS##
ALBU
BS##
BLBU
ALBV
ALBW
ALBX
ALWT
C9##
BLWT
ALWU
C7##
BLWU
ALWV
BLWV
ALWW
ALWX
BLWX
ALWU
C7##
BLWU
ALWW
AV##
ALW6
BV##
BLW6
ALW7
BLW7
ALW9
CB##
BLW9
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.
Copyright
©
2006, EM Microelectronic-Marin SA
03/06 – rev.K
2
www.emmicroelectronic.com
EM6353
Standard Versions (samples)
Part Number
EM6353BX1SP3B-2.6+
EM6353BX1SP3B-2.9+
EM6353BX1SP3B-4.4+
EM6353BX1SP3B-4.6+
EM6353BX2SP3B-1.8+
EM6353BX2SP3B-2.6+
EM6353BX2SP3B-2.9+
EM6353BX2SP3B-3.1+
EM6353BX2SP3B-4.4+
EM6353BX2SP3B-4.6+
Part Number
EM6353BXSC5B-2.9
EM6353BXSC5B-3.1
EM6353BY1SP3B-2.9+
EM6353BY2SP3B-2.9+
EM6353BY2SP3B-3.1+
EM6353BY2SP3B-4.6+
EM6353BYSC5B-2.9+
EM6353BZ2SP3B-2.9+
EM6353BZ2SP3B-3.1+
EM6353BZ2SP3B-4.6
Sample stock is generally held on
standard versions
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.
Absolute Maximum Ratings
Parameter
Voltage at V
DD
to GND
Minimum voltage at any signal pin
Maximum voltage at any signal pin
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
Electrostatic discharge max. to
MIL-STD-883C method 3015.7
with ref. to V
SS
Max. soldering conditions
Storage Temperature Range
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 (note 1)
Operating Temperature
Symbol Min Max Unit
V
DD
0.8 5.5
V
T
A
-40 +125 °C
Stresses above these listed maximum ratings may cause
permanent damage to the device. Exposure beyond
specified operating conditions may affect device
reliability or cause malfunction.
Electrical Characteristics
Unless otherwise specified: V
DD
= 0.8V to 5.5V, T
A
=-40°C to +125°C (note 1).
Parameter
Symbol
Conditions
V
DD
=1.5V
Supply current (note 2)
I
DD
V
DD
=3.3V
V
DD
=5.0V
Threshold voltage
(note 3)
V
TH
EM6353 – 1.3
+25°C
-40°C to +125°C
+25°C
-40°C to +125°C
+25°C
-40°C to +125°C
+25°C
-40°C to +85°C
-40°C to +125°C
+25°C
-40°C to +85°C
-40°C to +125°C
+25°C
-40°C to +85°C
-40°C to +125°C
+25°C
-40°C to +85°C
-40°C to +125°C
+25°C
-40°C to +85°C
-40°C to +125°C
+25°C
-40°C to +85°C
-40°C to +125°C
+25°C
-40°C to +85°C
3
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
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
Unit
µ
A
V
EM6353 – 1.4
1.38
EM6353 – 1.6
1.57
EM6353 – 1.7
1.66
EM6353 – 1.8
1.80
EM6353 – 2.2
EM6353 – 2.6
Copyright
©
2006, EM Microelectronic-Marin SA
03/06 – rev.K
2.20
2.63
www.emmicroelectronic.com
EM6353
EM6353 – 2.9
-40°C to +125°C
+25°C
-40°C to +85°C
-40°C to +125°C
+25°C
-40°C to +85°C
-40°C to +125°C
+25°C
-40°C to +85°C
-40°C to +125°C
+25°C
-40°C to +85°C
-40°C to +125°C
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
-
2.93
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
-
V
EM6353 – 3.1
3.08
EM6353 – 4.4
4.40
EM6353 – 4.6
Threshold hysteresis
V
HYS
4.63
2.1%
•
V
TH
T
A
=+25°C
Note 1:
Note 3:
Production tested at +25°C only. Over temperature limits are guaranteed by design, not production tested.
V
DD
min=0.9V for active-high versions (EM6353_Z).
Threshold voltage is specified for V
DD
falling.
Copyright
©
2006, EM Microelectronic-Marin SA
03/06 – rev.K
4
www.emmicroelectronic.com
EM6353
Electrical Characteristics
Parameter
Reset timeout period
Propagation delay time
V
DD
to
RESET
(RESET) delay
Open-drain RESET output
Voltage
(continued)
Unless otherwise specified: V
DD
= 0.8V to 5.5V, T
A
=-40°C to +125°C (note 1).
Symbol
t
POR
t
P
Conditions
V
DD
from 0V to V
TH (typ)
+15%
(note 2 and 4). T
A
= +25°C
EM6353B
EM6353A
Min
155
19.4
2
-
-
-
-
-
-
0.8
2
4
-
Typ
200
25
130
-
-
-
-
-
-
-
-
-
-
Max
224
28
255
0.3
0.3
0.3
0.3
0.3
0.35
-
-
-
0.5
Unit
ms
V
DD
drops from V
TH (typ)
+0.2V to V
TH (typ)
-0.2V
(note 2). T
A
= +25°C
V
DD
>1V
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
DD
>2.5V
V
DD
>5V
V
DD
>1V
µ
s
V
OL
V
V
OL
Push-pull RESET /
RESET
Output voltage
V
OH
Output leakage current
I
LEAK
V
DD
>2.5V
V
DD
>5V
V
DD
>1V
V
DD
>2.5V
V
DD
>5V
V
Only for EM6353_Y (open-drain)
µ
A
Note 1:
Note 2:
Note 4:
Production tested at +25°C only. Over temperature limits are guaranteed by design, not production tested.
V
DD
min=0.9V for active-high versions (EM6353_Z).
RESET
(RESET) open.
Standard version is EM6353B (t
POR
=200ms), available at all times. EM6353A (t
POR
=25ms) is available by mask option and upon
minimum order quantity. Please contact EM sales.
Timing Waveforms
t
SEN
V
DD
V
TH
Overdrive
V
HYS
0.8V
t
logic "1"
RESET
logic "0"
t
logic "1"
t
POR
t
P
RESET
RESET
logic "0"
t
Note 6:
t
SEN
= Maximum Transient Duration. Please refer to figure on next page.
Note 7:
Overdrive = V
TH-
-V
DD
. Please refer to figure on next page.
Copyright
©
2006, EM Microelectronic-Marin SA
03/06 – rev.K
5
www.emmicroelectronic.com
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