EM6354
Copyright
2006, EM Microelectronic-Marin SA
03/06 rev.I
1
www.emmicroelectronic.com
Reset Circuit with Adjustable Delay
Description
The EM6354 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 125C 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. 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 going
fully active. This delay time, or reset timeout period, can be
adjusted using an external capacitor.
The output is guaranteed to be in the correct state for V
DD
down to 0.8V. There are 11 reset threshold voltages starting
as low as 1.31V and up to 4.63V. The EM6354 features
three output types: active-low push-pull, active-low open-
drain and active-high push-pull.
Small SC70 and SOT23 packages as well as ultra-low
supply current of 2.9A make the EM6354 an ideal choice
for portable and battery-operated devices.
Typical Application
V
DD
GND
RESET
EM6354
V
DD
GND
RESET
MPU, DSP
V
DD
GND
C
D
*
*
R
EXT
for open-drain version only
Pin Configuration
(top view)
SC70-4L
(SC-82AB)
1
2
4
3
V
DD
GND
C
D
SOT23-5L
1
3
2
5
4
C
D
NC
V
DD
GND
RESET
(RESET)
RESET
(RESET)
Features
!
Adjustable reset timeout period using an external
capacitor
!
Ultra-low supply current of 2.9A (V
DD
=3.3V)
!
Operating temperature range: -40C to +125C
!
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 0.8V
!
Threshold hysteresis: 2.1% of V
TH
!
Very small SOT23-5L and SC70-4L (SC-82AB)
packages
Applications
!
Home appliances
!
Modems
!
Routers, hubs and gateways
!
WAN, LAN
!
Handheld GPS
!
Metering and Instrumentation
!
TV sets
!
Automotive systems
Block Diagram
(RESET)
RESET
V
DD
GND
+
-
Voltage
Reference
Delay
Circuit
C
D
Pin Description
Pin
SOT23-5L SC70-4L
Name Function
RESET
Active-low
RESET output. RESET remains low for the reset timeout period after all reset
conditions are deasserted and then goes high.
1 1
RESET
Active-high RESET output. RESET remains high for the reset timeout period after all reset
conditions are deasserted and then goes low.
2 2
V
DD
Supply Voltage (5.5V max.)
3 4
GND
Ground
4
-
N.C.
Not connected. Not internally connected
5 3
C
D
Connect a capacitor between C
D
and GND to set the timeout period
(C
D
min=1nF; C
D
max=10000nF). Reset Timeout Period in [ms] is equal to C
D
in [nF]
EM MICROELECTRONIC
-MARIN SA
EM6354
Copyright
2006, EM Microelectronic-Marin SA
03/06 rev.I
2
www.emmicroelectronic.com
Ordering Information
EM6354
-
Reset Output Type:
RoHS Compliance:
X = Active-low /RES push-pull
+ = lead-free/green mold compliant
Y = Active-low /RES open-drain
[blank] = leaded
Z = Active-high RES push-pull
Reset Threshold Voltage (V
TH
):
1.3 = 1.31V
2.6 = 2.63V
Package:
1.4 = 1.38V
2.9 = 2.93V
SP5B = SOT23-5, Tape&Reel 3000 pcs
1.6 = 1.57V
3.1 = 3.08V
SC4B = SC70-4, Tape&Reel 3000 pcs
1.7 = 1.66V
4.4 = 4.40V
1.8 = 1.80V
4.6 = 4.63V
2.2 = 2.20V
+
X SP5B 2.9
Note: subject to availability (see standard versions list below). Please give complete Part Number when ordering.
Standard Versions (Top Marking)
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.
Standard Versions (samples)
Part Number
EM6354XSC4B-2.6+
EM6354XSC4B-4.6
Part Number
EM6354XSP5B-2.9+
EM6354YSP5B-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.
Part Number
Top
Marking
1)
Top Marking
2)
with 4
Characters
EM6354XSP5B-1.3
AMAA
EM6354XSP5B-1.8
AMAE
EM6354XSP5B-1.8+ KC## BMAE
EM6354XSP5B-2.6
AMAG
EM6354XSP5B-2.9
AMAH
EM6354XSP5B-2.9+ KA## BMAH
EM6354XSP5B-4.6
AMAL
EM6354XSC4B-1.3
AMAA
EM6354XSC4B-1.8
AMAE
EM6354XSC4B-2.6
AMAG
EM6354XSC4B-2.6+ K4## BMAG
EM6354XSC4B-2.9
AMAH
EM6354XSC4B-4.6
AMAL
EM6354XSC4B-4.6+ KB## BMAL
EM6354YSP5B-2.6
AMAT
EM6354YSP5B-4.4
AMAW
Part Number
Top
Marking
1)
Top Marking
2)
with 4
Characters
EM6354YSP5B-4.6
AMAX
EM6354YSP5B-4.6+ K1## BMAX
EM6354XSP5B-1.3
AMAA
EM6354XSP5B-1.8
AMAE
EM6354XSP5B-2.6
AMAG
EM6354XSP5B-2.9
AMAH
EM6354
Copyright
2006, EM Microelectronic-Marin SA
03/06 rev.I
3
www.emmicroelectronic.com
Absolute Maximum Ratings
Parameter Symbol
Conditions
Voltage at V
DD
to GND
V
DD
-0.3V to +6V
Minimum voltage at any signal
pin
V
MIN
GND - 0.3V
Maximum voltage at any signal
pin
V
MAX
V
DD
+ 0.3V
Electrostatic discharge max. to
MIL-STD-883C method 3015.7
with ref. to V
SS
V
ESD
2000V
Max. soldering conditions
T
MAX
250C x 10s
Storage Temperature Range
T
STG
-65C to +150C
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, 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 Symbol
Min
Max
Unit
Supply voltage (note 1)
V
DD
0.8 5.5
V
Operating Temperature
T
A
-40
+125 C
Electrical Characteristics
Unless otherwise specified: V
DD
= 0.8V to 5.5V, T
A
=+25C (note 1).
Parameter Symbol
Conditions
Min
Typ
Max
Unit
+25C -
4.6
V
DD
=1.5V
-40C to +125C
-
2.3
7
+25C -
5.5
V
DD
=3.3V
-40C to +125C
-
2.9
8.3
+25C -
6.3
Supply current (note 2)
I
DD
V
DD
=5.0V
-40C to +125C
-
3.4
9.6
A
EM6354 1.3
1.290
1.31
1.330
EM6354 1.4
1.359
1.38
1.401
EM6354 1.6
1.546
1.57
1.594
EM6354 1.7
1.635
1.66
1.685
EM6354 1.8
1.773
1.80
1.827
EM6354 2.2
2.167
2.20
2.233
EM6354 2.6
2.591
2.63
2.669
EM6354 2.9
2.886
2.93
2.974
EM6354 3.1
3.034
3.08
3.126
EM6354 4.4
4.334
4.40
4.466
Threshold voltage
(note 3)
V
TH
EM6354 4.6
4.561
4.63
4.699
V
Threshold voltage
temperature coefficient
(note 4)
A
TH
T
V
T
A
= -40C to +125C
-
50
- ppm/C
Threshold hysteresis
V
HYS
-
2.1%
V
TH
- V
Note 1: Production tested at +25C only. Over temperature limits are guaranteed by design, not production tested.
V
DD
min=0.9V for active-high versions (EM6354Z).
Note 2:
RESET
(RESET)
open.
Note 3: Threshold voltage is specified for V
DD
falling.
Note 4: Typical variation V
TH
of V
TH
at a given temperature T
A
is calculated as follows:
C
25
T
V
T
V
)
T
T
(
V
A
TH
A
TH
A
TH
-
=
=
Example:
for version V
TH
=2.93V, variation at T
A
=70C is equal to V
TH
(70C)=50
10
-6
x 2.93 x (70-25)=6.59mV
EM6354
Copyright
2006, EM Microelectronic-Marin SA
03/06 rev.I
4
www.emmicroelectronic.com
Electrical Characteristics
(continued)
Unless otherwise specified: V
DD
= 0.8V to 5.5V, T
A
=+25 C (note 1).
Parameter Symbol Conditions Min
Typ
Max
Unit
Reset timeout period
t
POR
C
D
=100nF (measured value, note 5)
V
DD
from 0V to V
TH (typ)
+15% (note 2)
EM6354-4.6 version
72 100 122 ms
Propagation delay time
V
DD
to
RESET
(RESET) delay
t
P
V
DD
drops from V
TH (typ)
+0.2V to V
TH (typ)
-0.2V
(note 2)
2 130
255
s
V
DD
>1V
I
OL
=100
A
- - 0.3
-40C to +125C
V
DD
>2.5V I
OL
=1.5mA - - 0.3
Open-drain
RESET
output
Voltage
V
OL
V
DD
>5V I
OL
=3mA -
-
0.3
V
V
DD
>1V
I
OL
=100
A
- - 0.3
-40C to +125C
V
DD
>2.5V I
OL
=1.5mA - - 0.3
V
OL
V
DD
>5V I
OL
=3mA -
-
0.3
V
DD
>1V
I
OH
=-30
A
0.8 - -
-40C to +125C
V
DD
>2.5V I
OH
=-1.5mA 2 - -
Push-pull RESET /
RESET
Output voltage
V
OH
V
DD
>5V
I
OH
=-3mA 4 - -
V
Output leakage current
I
LEAK
-40C to +125C, only for EM6354Y (open-drain)
-
-
0.5
A
Note 1: Production tested at +25C only. Over temperature limits are guaranteed by design, not production tested.
V
DD
min=0.9V for active-high version (EM6354Z).
Note 2:
RESET
(RESET)
open.
Note 5: t
POR
is programmable by varying the value of the external capacitor connected to pin C
D
. The relation is t
POR
(ms) =
C
D
(nF). The tolerance of the capacitor should be taken into account.
Timing Waveforms
RESET
V
DD
0.8V
V
TH
t
t
logic "1"
logic "0"
t
SEN
t
logic "1"
logic "0"
RESET
t
POR
t
P
V
HYS
RESET
Overdrive
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.
EM6354
Copyright
2006, EM Microelectronic-Marin SA
03/06 rev.I
5
www.emmicroelectronic.com
Typical Reset Timeout Period
The Reset Timeout Period (t
POR
) is programmable using an external capacitor connected to pin C
D
of EM6354. A ceramic
chip capacitor rated at or above 10V is sufficient. The Reset Timeout Period (t
POR
) can be calculated using the following
formula for V
TH
=4.63V (EM6354-4.6):
t
POR
(ms) = C
D
(nF).
For example a C
D
of 100nF will achieve a t
POR
of 100 ms. The tolerance of the capacitor should be taken into account. If no
delay due to t
POR
is needed in a certain application, the circuit EM6352 should be used instead.
For threshold voltage between V
TH
=4.63V and V
TH
=1.31V , the following graphic applies :
Typical Reset Timeout Period t
POR
vs. V
TH
for C
D
=100nF at T
A
=+25C
Reset Timeout Period t
POR
vs. Capacitor C
D
at T
A
=+25C
V
TH
100
110
120
130
1.31
2.93
4.63
[ ms ]
1
10
100
1000
10000
1
10
100
1000
10000
[nF]
[ms]
VTH
= 1.31 V
VTH
= 4.63 V
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