EM6323/24
Copyright
2006, EM Microelectronic-Marin SA
03/06 - rev.H
1
www.emmicroelectronic.com
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 3.8A make the EM6323 and the EM6324 an ideal choice
for portable and battery-operated devices.
Typical Application
V
DD
WDI
GND
RESET
MR
EM632x
V
DD
I/O
GND
RESET
MPU, DSP
V
DD
GND
*
*
R
EXT
for open-drain version only
RESET
RESET
Fig. 1
Block Diagram
Fig. 2
Features
!
Ultra-low supply current of 3.8A (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
!
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
Applications
!
Workstations
!
Point of sales (POS)
!
Personal computers
!
Routers, hubs and switches
!
Handheld GPS
!
Vending machines and ATM
!
Automotive systems
Pin Configuration
Fig. 3
Pin Description
SOT23-5L
EM6323 EM6324
Name Function
1 1
RESET Active-low
RESET
output (push-pull or open-drain)
2 2 GND
Ground
3 -
MR
Manual Reset input with an internal pull-up 30k
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
-
3
RESET
Active-high RESET output (push-pull)
4 4 WDI
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
5 5 V
DD
Supply Voltage (5.5V max.)
EM MICROELECTRONIC
- MARIN SA
SOT23-5
top view
1
3
2
5
4
EM6323
EM6323
(manual reset,
watchdog)
RESET
push-pull
RESET
MR
V
DD
WDI
GND
SOT23-5
top view
1
3
2
5
4
EM6324
EM6324
(watchdog)
V
DD
WDI
GND
RESET
push-pull/open-drain
V
DD
GND
+
-
Voltage
Reference
MR
Reset
Logic
+ Timer
WDI
Transition
Detector
Watchdog Logic
+ Timer
Oscillator
Filter
RESET
RESET
EM6323/24
Copyright
2006, EM Microelectronic-Marin SA
03/06 - rev.H
2
www.emmicroelectronic.com
Ordering Information
EM6323
-
Part Number:
RoHS Compliance:
EM6323 = manual reset & watchdog
+ = lead-free/green mold compliant
EM6324 = watchdog
[blank] = leaded
Delays t
POR
& t
WD
:
Reset Threshold Voltage:
EM6323/24:
t
POR
[ms]
1.3 = 1.31V
1.8 = 1.80V
3.1 = 3.08V
1.6 25
200 1600
1.4 = 1.38V
2.2 = 2.20V
4.4 = 4.40V
6.2 A
B
C
D
1.6 = 1.57V
2.6 = 2.63V
4.6 = 4.63V
102 E
F
G
H
1.7 = 1.66V
2.9 = 2.93V
1600 J
K
L
M
25600 N
P
Q
R
Package:
("L" is the standard version")
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)
t
WD
[ms]
+
L X SP5B 2.9
Note:
subject to availability (see standard versions list below). Please give complete Part Number when ordering
Standard Versions (Top Marking)
Threshold
Voltage
Delay (t
POR
)/
Watchdog timer (t
WD
)
Output Type
Package
Part Number
Top
Marking
1)
Top Marking
with 4
characters
2)
2.6V
200ms/1600ms
Active-high push-pull RESET
SOT23-5L EM6323LZSP5B-2.6
APL5
2.63V 200ms/1600ms Active-low push-pull RESET
SOT23-5L EM6323LXSP5B-2.6
APLG
2.63V 200ms/1600ms Active-low push-pull RESET
SOT23-5L EM6323LXSP5B-2.6+ KF##
BPLG
2.93V 200ms/1600ms Active-low push-pull RESET
SOT23-5L EM6323LXSP5B-2.9
APLH
2.93V 200ms/1600ms Active-low push-pull RESET
SOT23-5L EM6323LXSP5B-2.9+ K0##
BPLH
3.08V 200ms/1600ms Active-low push-pull RESET
SOT23-5L EM6323LXSP5B-3.1
APLJ
2.93V 200ms/1600ms Active-low open-drain RESET
SOT23-5L EM6323LYSP5B-2.9
APLU
2.93V 200ms/1600ms Active-low open-drain RESET
SOT23-5L EM6323LYSP5B-2.9+ K6##
BPLU
3.1V 200ms/1600ms
Active-low open-drain RESET
SOT23-5L EM6323LYSP5B-3.1
APLV
3.1V 200ms/1600ms Active-low push-pull RESET
SOT23-5L EM6323LXSP5B-3.1
APLJ
4.40V 200ms/1600ms Active-low push-pull RESET
SOT23-5L EM6324LXSP5B-4.4
AQMK
4.40V 200ms/1600ms Active-low push-pull RESET
SOT23-5L EM6324LXSP5B-4.4+ K9##
BQMK
2.9V 200ms/1600ms
Active-low open-drain RESET
SOT23-5L EM6324LYSP5B-2.9
AQLU
1.38V 200ms/25600ms Active-low push-pull RESET
SOT23-5L EM6324QXSP5B-1.4
AQQB
1)
Top marking is 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
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.
EM6323/24
Copyright
2006, EM Microelectronic-Marin SA
03/06 - rev.H
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
Input transition rise and fall rate
on
MR
and WDI
t
R
/t
F
-
100 ns/V
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 -
4.4
V
DD
=1.5V
-40C to +125C
-
2.4
6.8
+25C -
6.1
V
DD
=3.3V
-40C to +125C
-
3.86
9.9
+25C -
8.6
Supply current (note 2)
I
DD
V
DD
=5.0V
-40C to +125C
-
5.89
11.6
A
+25C 1.290
1.330
-40C to +85C
1.245
1.382
EM6323/24 1.3
-40C to +125C
1.221
1.31
1.387
+25C 1.359
1.401
-40C to +85C
1.311
1.456
EM6323/24 1.4
-40C to +125C
1.286
1.38
1.461
+25C 1.546
1.594
-40C to +85C
1.492
1.656
EM6323/24 1.6
-40C to +125C
1.463
1.57
1.663
+25C 1.635
1.685
-40C to +85C
1.577
1.751
EM6323/24 1.7
-40C to +125C
1.547
1.66
1.758
+25C 1.773
1.827
-40C to +85C
1.710
1.899
EM6323/24 1.8
-40C to +125C
1.678
1.80
1.906
+25C 2.167
2.233
-40C to +85C
2.090
2.321
EM6323/24 2.2
-40C to +125C
2.050
2.20
2.330
+25C 2.591
2.669
-40C to +85C
2.499
2.775
EM6323/24 2.6
-40C to +125C
2.451
2.63
2.785
+25C 2.886
2.974
-40C to +85C
2.784
3.091
EM6323/24 2.9
-40C to +125C
2.731
2.93
3.103
+25C 3.034
3.126
-40C to +85C
2.926
3.249
EM6323/24 3.1
-40C to +125C
2.871
3.08
3.262
+25C 4.334
4.466
-40C to +85C
4.180
4.642
EM6323/24 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
EM6323/24 4.6
-40C to +125C
4.315
4.63
4.903
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.
EM6323/24
Copyright
2006, EM Microelectronic-Marin SA
03/06 - rev.H
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
Threshold hysteresis
V
HYS
T
A
=+25C -
2.1%
V
TH
- V
EM6323/24
C-G-L-Q
160 200 240
EM6323/24 A-E-J-N
0.7
1.56
3.8
EM6323/24
B-F-K-P
20 25 30
Reset timeout period
t
POR
V
DD
from 0V to V
TH (typ)
+15%
T
A
= +25C
(note 2 and 4)
EM6323/24
D-H-M-R
1280 1600 1920
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 70 255
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
>1.1V
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 EM6323/24_Y (open-drain)
-
-
0.5
A
WATCHDOG INPUT (WDI)
WDI Input low
V
WDI
low
-
-
0.3
V
DD
V
WDI Input high
V
WDI
high
0.7
V
DD
-
- V
Pulse width at WDI
t
WP
T
A
= +25C
1 - -
s
EM6323/24
J-K-L-M
1280 1600 1920
EM6323/24 A-B-C-D
5
6.25
7.5
EM6323/24 E-F-G-H
80
100
120
Watchdog timeout period
t
WD
(note
6)
EM6323/24
N-P-Q-R
20480 25600 30720
ms
High-level Input Current
I
IH
WDI connected to VDD, T
A
=
+25C
- 18 -
A
Low-level Input Current
I
IL
WDI connected to GND, T
A
= +25C
-
8.3
-
A
MANUAL RESET (
MR
) EM6323 only
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
7
30
74
k
Note 1: Production tested at +25C only. Over temperature limits are guaranteed by design, not production tested.
Note 2: WDI,
MR
and
RESET
(RESET)
open.
Note 3: Threshold voltage is specified for V
DD
falling.
Note 4: 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
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.
EM6323/24
Copyright
2006, EM Microelectronic-Marin SA
03/06 - rev.H
5
www.emmicroelectronic.com
Timing Waveforms
V
DD
0.9V
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
Fig. 4
t
logic "1"
logic "0"
t
logic "1"
logic "0"
RESET
t
WP
RESET
logic "1"
logic "0"
WDI
t
WD
t
t
POR
t
WD
Fig. 5
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.
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