EM MICROELECTRONIC
- MARIN SA
EM6323/24
Reset Circuit with Manual Reset and Watchdog
Description
The EM6323/24 are low power, high precision reset ICs
featuring a manual reset and a watchdog inputs. They have
different threshold voltages and several timeout reset periods
(t
POR
) and watchdog timeout periods (t
WD
) for maximum
flexibility in the application. EM6323 has a manual reset (
MR
with internal pull-up) and a watchdog input pins. EM6324 has
only a watchdog input pin (WDI). The watchdog function can
be disabled by driving WDI with a three-state driver or by
leaving WDI unconnected. This is useful when the MCU is in
sleep mode.
Small SOT23-5L package as well as ultra-low supply current
of 3.8µA make the EM6323 and the EM6324 an ideal choice
for portable and battery-operated devices.
Features
!
!
!
!
!
!
!
Ultra-low supply current of 3.8µA (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
200ms reset timeout period (1.6ms, 25ms, 1600ms on
request)
1.6s watchdog timeout period (6.2ms, 102ms, 25.6s on
request)
3 reset output options:
Active-low
RESET
push-pull
Active-low
RESET
open-drain
Active-high
RESET
push-pull
Detection of microcontroller in sleep mode
Typical Application
V
DD
V
DD
RESET
RESET
*
V
DD
RESET
RESET
!
Applications
!
!
!
!
!
!
!
EM632x
MR
GND
WDI
MPU, DSP
I/O
GND
GND
*
R
EXT
for open-drain version only
Fig. 1
Block Diagram
V
DD
Oscillator
Workstations
Point of sales (POS)
Personal computers
Routers, hubs and switches
Handheld GPS
Vending machines and ATM
Automotive systems
Pin Configuration
RESET
RESET
+
Voltage
Reference
-
Reset
Logic
+ Timer
EM6323
RESET
GND
MR
1
2
3
(manual reset,
watchdog)
5
V
DD
EM6324
push-pull/open-drain
(watchdog)
5 V
DD
RESET
GND
EM6323
MR
GND
WDI
Transition
Detector
Filter
2
3
EM6324
1
4
WDI
RESET
push-pull
4
WDI
Watchdog Logic
+ Timer
SOT23-5
Fig. 2
top view
SOT23-5
top view
Fig. 3
Pin Description
SOT23-5L
EM6323 EM6324
1
2
3
-
4
5
1
2
-
3
4
5
Name
RESET
Function
Active-low
RESET
output (push-pull or open-drain)
Ground
Manual Reset input with an internal pull-up 30kΩ resistor. Reset remains active as long as
MR
is low
and for t
POR
after returns high.
MR
can be driven with a CMOS output or shorted to ground with a switch
Active-high RESET output (push-pull)
Watchdog input. WDI must be driven with a CMOS output. If the microcontroller I/O is put in a high
impedance condition, the circuit will detect this condition as a microcontroller in sleep mode and prevent
its watchdog from timing out
Supply Voltage (5.5V max.)
GND
MR
RESET
WDI
V
DD
Copyright
©
2006, EM Microelectronic-Marin SA
03/06 - rev.H
1
www.emmicroelectronic.com
EM6323/24
Ordering Information
EM6323 L X SP5B - 2.9 +
Part Number:
EM6323
= manual reset & watchdog
EM6324
= watchdog
Delays t
POR
& t
WD
:
EM6323/24:
t
WD
[ms]
t
POR
[ms]
1.6 25 200 1600
6.2
A
B
C
D
102
E
F
G
H
1600
J
K
L
M
25600
N
P
Q
R
("L" is the standard version")
RoHS Compliance:
+ = lead-free/green mold compliant
[blank]
= leaded
Reset Threshold Voltage:
1.3
= 1.31V
1.4
= 1.38V
1.6
= 1.57V
1.7
= 1.66V
1.8
= 1.80V
2.2
= 2.20V
2.6
= 2.63V
2.9
= 2.93V
3.1
= 3.08V
4.4
= 4.40V
4.6
= 4.63V
Package:
SP5B
= 5-pin SOT23-5, tape&reel, 3000 pcs
Reset Output Type:
X
= Active-low /RESET push-pull
(Active-high RESET push-pull also for EM6324)
Y
= Active-low /RESET open-drain
(Active-high RESET push-pull also for EM6324)
Z
= Active-high RESET push-pull
(EM6323 only)
Note:
subject to availability (see standard versions list below). Please give complete Part Number when ordering
Standard Versions (Top Marking)
Threshold
Voltage
2.6V
2.63V
2.63V
2.93V
2.93V
3.08V
2.93V
2.93V
3.1V
3.1V
4.40V
4.40V
2.9V
1.38V
1)
2)
Delay (t
POR
)/
Watchdog timer (t
WD
)
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/1600ms
200ms/25600ms
Output Type
Active-high push-pull RESET
Active-low push-pull
RESET
Active-low push-pull
RESET
Active-low push-pull
RESET
Active-low push-pull
RESET
Active-low push-pull
RESET
Active-low open-drain
RESET
Active-low open-drain
RESET
Active-low open-drain
RESET
Active-low push-pull
RESET
Active-low push-pull
RESET
Active-low push-pull
RESET
Active-low open-drain
RESET
Active-low push-pull
RESET
Package
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
SOT23-5L
Part Number
EM6323LZSP5B-2.6
EM6323LXSP5B-2.6
EM6323LXSP5B-2.6+
EM6323LXSP5B-2.9
EM6323LXSP5B-2.9+
EM6323LXSP5B-3.1
EM6323LYSP5B-2.9
EM6323LYSP5B-2.9+
EM6323LYSP5B-3.1
EM6323LXSP5B-3.1
EM6324LXSP5B-4.4
EM6324LXSP5B-4.4+
EM6324LYSP5B-2.9
EM6324QXSP5B-1.4
Top
Top Marking
1)
with 4
Marking
2)
characters
APL5
APLG
KF##
BPLG
APLH
K0##
BPLH
APLJ
APLU
K6##
BPLU
APLV
APLJ
AQMK
K9##
BQMK
AQLU
AQQB
Top marking is standard from 2006. No bottom marking exists. Where ## refers to the lot number (EM internal reference
only)
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
EM6323LXSP5B-2.6+
EM6323LXSP5B-2.9+
Part Number
EM6323LYSP5B-2.9+
EM6324LXSP5B-4.4+
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.
Copyright
©
2006, EM Microelectronic-Marin SA
03/06 - rev.H
2
www.emmicroelectronic.com
EM6323/24
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
Operating Temperature
Input transition rise and fall rate
on
MR
and WDI
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
t
R
/t
F
0.9 5.5
V
-40 +125 °C
-
100 ns/V
Electrical Characteristics
Unless otherwise specified: V
DD
= 0.9V 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
EM6323/24 – 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
-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
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
2.4
3.86
5.89
1.31
Max
4.4
6.8
6.1
9.9
8.6
11.6
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
µA
EM6323/24 – 1.4
1.38
EM6323/24 – 1.6
1.57
EM6323/24 – 1.7
1.66
EM6323/24 – 1.8
Threshold voltage
(note 3)
1.80
V
TH
EM6323/24 – 2.2
2.20
V
EM6323/24 – 2.6
2.63
EM6323/24 – 2.9
2.93
EM6323/24 – 3.1
3.08
EM6323/24 – 4.4
4.40
EM6323/24 – 4.6
4.63
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
©
2006, EM Microelectronic-Marin SA
03/06 - rev.H
3
www.emmicroelectronic.com
EM6323/24
Electrical Characteristics
(continued)
Unless otherwise specified: V
DD
= 0.9V to 5.5V, T
A
=-40°C to +125° C (note 1).
Parameter
Threshold hysteresis
Symbol
V
HYS
Conditions
T
A
=+25°C
EM6323/24 C-G-L-Q
V
DD
from 0V to V
TH (typ)
+15%
T
A
= +25°C
(note 2 and 4)
EM6323/24 A-E-J-N
EM6323/24 B-F-K-P
EM6323/24 D-H-M-R
Min
-
160
0.7
20
1280
2
-
-
-
-
-
-
0.8
2
4
-
-
Typ
2.1%•V
TH
200
1.56
25
1600
70
-
-
-
-
-
-
-
-
-
-
-
-
-
1600
6.25
100
25600
18
8.3
-
-
0.3
-
30
Max
-
240
3.8
30
1920
255
0.3
0.3
0.35
0.3
0.3
0.35
-
-
-
0.5
0.3
•
V
DD
-
-
1920
7.5
120
30720
-
-
0.3
•
V
DD
-
-
-
74
Unit
V
Reset timeout period
t
POR
ms
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
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
µ
s
V
OL
V
DD
>2.5V
V
DD
>5V
V
DD
>1V
V
V
OL
Push-pull RESET /
RESET
Output voltage
V
OH
Output leakage current
I
LEAK
V
WDI
low
V
WDI
high
t
WP
V
DD
>2.5V
V
DD
>5V
V
DD
>1.1V
V
DD
>2.5V
V
DD
>5V
V
Only for EM6323/24_Y (open-drain)
µ
A
V
V
WATCHDOG INPUT (WDI)
WDI Input low
WDI Input high
Pulse width at WDI
T
A
= +25°C
EM6323/24 J-K-L-M
Watchdog timeout period
t
WD
(note 6)
EM6323/24 A-B-C-D
EM6323/24 E-F-G-H
EM6323/24 N-P-Q-R
High-level Input Current
Low-level Input Current
I
IH
I
IL
V
MRT
low
V
MRT
high
t
MD
t
PMD
R
MR
T
A
=-40°C to +125°C
T
A
= +25°C
WDI connected to VDD, T
A
= +25°C
WDI connected to GND, T
A
= +25°C
0.7
•
V
DD
1
1280
5
80
20480
-
-
-
0.7
•
V
DD
-
1
7
µ
s
ms
µ
A
µ
A
V
V
MANUAL RESET (
MR
) –
EM6323 only
MR
Input low
MR
Input high
MR
to Reset delay
Pulse width at
MR
(note 5)
µ
s
µ
s
k
Ω
MR
Internal Pull-up
resistor
Production tested at +25°C only. Over temperature limits are guaranteed by design, not production tested.
WDI,
MR
and
RESET
(RESET)
open.
Threshold voltage is specified for V
DD
falling.
Standard version for t
POR
is 200ms (typ). 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
µ
s to ensure the
RESET (RESET)
to go active.
Note 6:
Standard version for t
WD
is 1600ms (typ). Other option (6.2ms, 102ms, 25.6s) are available by mask option and
upon minimum order quantity. Please contact EM sales.
Note 1:
Note 2:
Note 3:
Note 4:
Copyright
©
2006, EM Microelectronic-Marin SA
03/06 - rev.H
4
www.emmicroelectronic.com
EM6323/24
Timing Waveforms
V
DD
V
TH
t
SEN
V
HYS
Overdrive
0.9V
t
logic "1"
MR
logic "0"
t
logic "1"
RESET
logic "0"
t
logic "1"
RESET
logic "0"
t
Fig. 4
t
PMD
t
POR
t
MD
t
P
t
POR
logic "1"
WDI
logic "0"
t
WP
t
WD
t
WD
t
logic "1"
RESET
logic "0"
t
logic "1"
RESET
logic "0"
t
Fig. 5
t
POR
Note 7:
t
SEN
= Maximum Transient Duration. Please refer to figure on the next page.
Note 8:
Overdrive = V
TH
-V
DD
. Please refer to figure on the next page.
Copyright
©
2006, EM Microelectronic-Marin SA
03/06 - rev.H
5
www.emmicroelectronic.com
