EM6325
Copyright
2005, EM Microelectronic-Marin SA
1
www.emmicroelectronic.com
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 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 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 2.9A make the EM6325 an
ideal choice for portable and battery-operated devices.
Typical Application
V
DD
RESET
GND
RESET
MR
EM6325
V
DD
RESET
GND
RESET
MPU, DSP
V
DD
GND
*
*
R
EXT
for open-drain version only
Block Diagram
RESET
V
DD
GND
+
-
Voltage
Reference
MR
Reset
Logic
Filter
RESET
Oscillator
Features
Manual reset function
200ms reset timeout period (1.6ms, 25ms, 1600ms on
request)
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 0.9V
Threshold hysteresis: 2.1% of V
TH
Very small SOT23-5L, SC70-5L and SC70-4L
Applications
Computers
Servers and workstations
Modems
Wireless communication
Metering
Playstations
PDA , Webpad
Automotive systems
Pin Configuration
(top view)
SOT23-5 / SC70-5
top view
1
3
2
4
RESET
push-pull / open-drain
GND
RESET
push-pull
V
DD
MR
5
SC70-4
1
2
4
3
V
DD
GND
RESET
(RESET)
MR
top view
Pin Description
Pin
SOT23-5L / SC70-5L SC70-4L
Name Function
1 2
RESET
Active-low RESET output. RESET remains low for the reset timeout period and
then goes high after all reset conditions are deasserted or after
MR goes from low
to high
2 1
GND
Ground
3 2
RESET
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
4 3
MR
Manual Reset input with an internal pull-up 15k
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
5 4
V
DD
Supply Voltage (5.5V max.)
EM MICROELECTRONIC
- MARIN SA
EM6325
Copyright
2005, EM Microelectronic-Marin SA
2
www.emmicroelectronic.com
Ordering Information
EM6325
-
Delay (t
POR
):
RoHS Compliance:
C = 200ms
B = 25ms
+ = lead-free/green mold compliant
A = 1.6ms
D = 1600ms
[blank]
= leaded
Reset Output Type:
Reset Threshold Voltage (V
TH
):
X = Active-low /RES push-pull
1.3 = 1.31V
2.6 = 2.63V
Active-high RES push-pull
1.4 = 1.38V
2.9 = 2.93V
Y = Active-low /RES open-drain
1.6 = 1.57V
3.1 = 3.08V
Active-high RES push-pull
1.7 = 1.66V
4.4 = 4.40V
Z = Active-high RES push-pull
1.8 = 1.80V
4.6 = 4.63V
2.2 = 2.20V
Package:
SP5B = SOT23-5, Tape&Reel 3000 pcs
SC5B = SC70-5, Tape&Reel 3000 pcs
SC4B = SC70-4, Tape&Reel 3000 pcs
+
C X SP5B 2.9
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
Top
Marking
Part Number
Top
Marking
Part Number
Top
Marking
Part Number
Top
Marking
EM6325AX__-1.3
ANAA
EM6325BX__-1.3
ANBA
EM6325CX__-1.3
ANCA
EM6325DX__-1.3
ANDA
EM6325AX__-1.4
ANAB
EM6325BX__-1.4
ANBB
EM6325CX__-1.4
ANCB
EM6325DX__-1.4
ANDB
EM6325AX__-1.6
ANAC
EM6325BX__-1.6
ANBC
EM6325CX__-1.6
ANCC
EM6325DX__-1.6
ANDC
EM6325AX__-1.7
ANAD
EM6325BX__-1.7
ANBD
EM6325CX__-1.7
ANCD
EM6325DX__-1.7
ANDD
EM6325AX__-1.8
ANAE
EM6325BX__-1.8
ANBE
EM6325CX__-1.8
ANCE
EM6325DX__-1.8
ANDE
EM6325AX__-2.2
ANAF
EM6325BX__-2.2
ANBF
EM6325CX__-2.2
ANCF
EM6325DX__-2.2
ANDF
EM6325AX__-2.6
ANAG
EM6325BX__-2.6
ANBG
EM6325CX__-2.6
ANCG
EM6325DX__-2.6
ANDG
EM6325AX__-2.9
ANAH
EM6325BX__-2.9
ANBH
EM6325CX__-2.9
ANCH
EM6325DX__-2.9
ANDH
EM6325AX__-3.1
ANAJ
EM6325BX__-3.1
ANBJ
EM6325CX__-3.1
ANCJ
EM6325DX__-3.1
ANDJ
EM6325AX__-4.4
ANAK
EM6325BX__-4.4
ANBK
EM6325CX__-4.4
ANCK
EM6325DX__-4.4
ANDK
EM6325AX__-4.6
ANAL
EM6325BX__-4.6
ANBL
EM6325CX__-4.6
ANCL
EM6325DX__-4.6
ANDL
EM6325AY__-1.3
ANAM
EM6325BY__-1.3
ANBM
EM6325CY__-1.3
ANCM
EM6325DY__-1.3
ANDM
EM6325AY__-1.4
ANAN
EM6325BY__-1.4
ANBN
EM6325CY__-1.4
ANCN
EM6325DY__-1.4
ANDN
EM6325AY__-1.6
ANAP
EM6325BY__-1.6
ANBP
EM6325CY__-1.6
ANCP
EM6325DY__-1.6
ANDP
EM6325AY__-1.7
ANAQ
EM6325BY__-1.7
ANBQ
EM6325CY__-1.7
ANCQ
EM6325DY__-1.7
ANDQ
EM6325AY__-1.8
ANAR
EM6325BY__-1.8
ANBR
EM6325CY__-1.8
ANCR
EM6325DY__-1.8
ANDR
EM6325AY__-2.2
ANAS
EM6325BY__-2.2
ANBS
EM6325CY__-2.2
ANCS
EM6325DY__-2.2
ANDS
EM6325AY__-2.6
ANAT
EM6325BY__-2.6
ANBT
EM6325CY__-2.6
ANCT
EM6325DY__-2.6
ANDT
EM6325AY__-2.9
ANAU
EM6325BY__-2.9
ANBU
EM6325CY__-2.9
ANCU
EM6325DY__-2.9
ANDU
EM6325AY__-3.1
ANAV
EM6325BY__-3.1
ANBV
EM6325CY__-3.1
ANCV
EM6325DY__-3.1
ANDV
EM6325AY__-4.4
ANAW
EM6325BY__-4.4
ANBW
EM6325CY__-4.4
ANCW
EM6325DY__-4.4
ANDW
EM6325AY__-4.6
ANAX
EM6325BY__-4.6
ANBX
EM6325CY__-4.6
ANCX
EM6325DY__-4.6
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
EM6325
Copyright
2005, EM Microelectronic-Marin SA
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
V
DD
0.9 5.5
V
Operating Temperature
T
A
-40
+125
C
Electrical Characteristics
Unless otherwise specified: V
DD
= 0.9V to 5.5V, T
A
=-40C to +125C (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
+25C 1.290
1.330
-40C to +85C
1.245
1.382
EM6325 1.3
-40C to +125C
1.221
1.31
1.387
+25C 1.359
1.401
-40C to +85C
1.311
1.456
EM6325 1.4
-40C to +125C
1.286
1.38
1.461
+25C 1.546
1.594
-40C to +85C
1.492
1.656
EM6325 1.6
-40C to +125C
1.463
1.57
1.663
+25C 1.635
1.685
-40C to +85C
1.577
1.751
EM6325 1.7
-40C to +125C
1.547
1.66
1.758
+25C 1.773
1.827
-40C to +85C
1.710
1.899
EM6325 1.8
-40C to +125C
1.678
1.80
1.906
+25C 2.167
2.233
-40C to +85C
2.090
2.321
EM6325 2.2
-40C to +125C
2.050
2.20
2.330
+25C 2.591
2.669
-40C to +85C
2.499
2.775
EM6325 2.6
-40C to +125C
2.451
2.63
2.785
+25C 2.886
2.974
-40C to +85C
2.784
3.091
EM6325 2.9
-40C to +125C
2.731
2.93
3.103
+25C 3.034
3.126
-40C to +85C
2.926
3.249
EM6325 3.1
-40C to +125C
2.871
3.08
3.262
+25C 4.334
4.466
-40C to +85C
4.180
4.642
EM6325 4.4
-40C to +125C
4.101
4.40
4.660
+25C 4.561
4.699
-40C to +85C
4.399
4.885
Threshold voltage
(note 3)
V
TH
EM6325 4.6
-40C to +125C
4.315
4.63
4.903
V
Threshold hysteresis
V
HYS
T
A
=+25C -
2.1%
V
TH
- V
Note 1:
Production tested at +25C only. Over temperature limits are guaranteed by design, not production tested.
Note 3:
Threshold voltage is specified for V
DD
falling.
EM6325
Copyright
2005, EM Microelectronic-Marin SA
4
www.emmicroelectronic.com
Electrical Characteristics
(continued)
Unless otherwise specified: V
DD
= 0.9V to 5.5V, T
A
=-40C to +125 C (note 1).
Parameter Symbol
Conditions Min
Typ
Max
Unit
EM6325C 155 200 224
EM6325A 0.7 1.6 3.8
EM6325B 19.4 25 28
Reset timeout period
t
POR
(note 2 and 4)
V
DD
from 0V to V
TH (typ)
+15%
T
A
= +25C
EM6325D 1240 1600 1792
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). T
A
= +25C
2 130
255
s
V
DD
>1V
I
OL
=100
A
- -
0.3
V
DD
>2.5V I
OL
=1.5mA -
-
0.3
Open-drain
RESET
output
Voltage
V
OL
V
DD
>5V I
OL
=3mA -
-
0.35
V
V
DD
>1V
I
OL
=100
A
- -
0.3
V
DD
>2.5V I
OL
=1.5mA -
-
0.3
V
OL
V
DD
>5V I
OL
=3mA -
-
0.35
V
DD
>1V
I
OH
=-30
A
0.8 - -
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
Only for EM6325_Y (open-drain)
-
-
0.5
A
MANUAL RESET (
MR
)
MR Input low
V
MRT
low
0.3
V
DD
V
MR Input high
V
MRT
high
0.7
V
DD
V
MR to Reset delay
t
MD
0.3
s
Pulse width at MR (note 5)
t
PMD
T
A
= +25C
1
s
MR Internal Pull-up resistor
R
MR
T
A
=-40C to +125C
4.8
15
31
k
Note 1:
Production tested at +25C 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 1
s to ensure the
RESET
(RESET)
to go active.
EM6325
Copyright
2005, EM Microelectronic-Marin SA
5
www.emmicroelectronic.com
Timing Waveforms
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 15k
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 0.1
F capacitor from
MR
to V
SS
to provide additional noise immunity (stronger external additional
pull-up resistor can also be added).
V
DD
0.8V
V
TH
t
t
logic "1"
logic "0"
t
SEN
t
logic "1"
logic "0"
RESET
t
POR
t
MD
V
HYS
RESET
Overdrive
logic "1"
logic "0"
MR
t
PMD
t
t
POR
t
P
PDF 
ZIP