EM EM6354 Reset circuit with adjustable delay Datasheet

EM MICROELECTRONIC-MARIN SA
EM6354
Reset Circuit with Adjustable Delay
Description
Features
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 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. The
threshold defines the minimum allowed voltage which
guarantees the good functionality of the system. When VDD
rises above VTH, 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 VDD
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 opendrain and active-high push-pull.
Small SC70 and SOT23 packages as well as ultra-low
supply current of 2.9µA make the EM6354 an ideal choice
for portable and battery-operated devices.
!
!
!
!
!
!
Active-low RESET push-pull
!
!
!
!
!
VDD
*
VDD
RESET
EM6354
!
VDD
!
RESET
!
MPU, DSP
!
!
CD
GND
!
GND
!
GND
* REXT for open-drain version only
V DD
GND
5
CD
2
3
Home appliances
Modems
Routers, hubs and gateways
WAN, LAN
Handheld GPS
Metering and Instrumentation
TV sets
Automotive systems
Block Diagram
VDD
Pin Configuration (top view)
1
Active-low RESET open-drain
Active-high RESET push-pull
Immune to short negative VDD transients
Guaranteed Reset valid down to 0.8V
Threshold hysteresis: 2.1% of VTH
Very small SOT23-5L and SC70-4L (SC-82AB)
packages
Applications
Typical Application
RESET
(RESET)
Adjustable reset timeout period using an external
capacitor
Ultra-low supply current of 2.9µA (VDD=3.3V)
Operating temperature range: -40°C to +125°C
±1.5% reset threshold accuracy
11 reset threshold voltages VTH: 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:
RESET
(RESET)
V DD
4 NC
SOT23-5L
Voltage
Reference
1
4
GND
2
3
CD
+
SC70-4L
Delay
Circuit
RESET
(RESET)
(SC-82AB)
CD
GND
Pin Description
SOT23-5L
Pin
SC70-4L
Name
RESET
1
1
RESET
2
3
4
2
4
-
VDD
GND
N.C.
5
3
CD
Function
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.)
Ground
Not connected. Not internally connected
Connect a capacitor between CD and GND to set the timeout period
(CD min=1nF; C D max=10000nF). Reset Timeout Period in [ms] is equal to CD in [nF]
Copyright © 2006, EM Microelectronic-Marin SA
03/06 – rev.I
1
www.emmicroelectronic.com
EM6354
Ordering Information
EM6354 X SP5B - 2.9 +
Reset Output Type:
X = Active-low /RES push-pull
Y = Active-low /RES open-drain
Z = Active-high RES push-pull
RoHS Compliance:
+ = lead-free/green mold compliant
[blank] = leaded
Reset Threshold Voltage (VTH):
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
Package:
SP5B = SOT23-5, Tape&Reel 3000 pcs
SC4B = SC70-4, Tape&Reel 3000 pcs
Note:
subject to availability (see standard versions list below). Please give complete Part Number when ordering.
Standard Versions (Top Marking)
Part Number
EM6354XSP5B-1.3
EM6354XSP5B-1.8
EM6354XSP5B-1.8+
EM6354XSP5B-2.6
EM6354XSP5B-2.9
EM6354XSP5B-2.9+
EM6354XSP5B-4.6
EM6354XSC4B-1.3
EM6354XSC4B-1.8
EM6354XSC4B-2.6
EM6354XSC4B-2.6+
EM6354XSC4B-2.9
EM6354XSC4B-4.6
EM6354XSC4B-4.6+
EM6354YSP5B-2.6
EM6354YSP5B-4.4
1)
2)
Top Marking
Top
1)
Marking
with 4
Characters
KC##
KA##
K4##
KB##
2)
Part Number
EM6354YSP5B-4.6
EM6354YSP5B-4.6+
EM6354XSP5B-1.3
EM6354XSP5B-1.8
EM6354XSP5B-2.6
EM6354XSP5B-2.9
AMAA
AMAE
BMAE
AMAG
AMAH
BMAH
AMAL
AMAA
AMAE
AMAG
BMAG
AMAH
AMAL
BMAL
AMAT
AMAW
Top Marking
Top
1)
Marking
with 4
Characters
K1##
2)
AMAX
BMAX
AMAA
AMAE
AMAG
AMAH
Top marking is the 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
Part Number
EM6354XSC4B-2.6+
EM6354XSP5B-2.9+
EM6354XSC4B-4.6
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.
Copyright © 2006, EM Microelectronic-Marin SA
03/06 – rev.I
2
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EM6354
Absolute Maximum Ratings
Handling Procedures
Parameter
Symbol
Conditions
Voltage at VDD to GND
VDD
-0.3V to +6V
Minimum voltage at any signal
GND - 0.3V
VMIN
pin
Maximum voltage at any signal
VMAX
VDD + 0.3V
pin
Electrostatic discharge max. to
MIL-STD-883C method 3015.7
2000V
VESD
with ref. to VSS
Max. soldering conditions
TMAX
250°C x 10s
Storage Temperature Range
TSTG -65°C to +150°C
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
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
VDD
0.8 5.5
V
TA
-40 +125 °C
Electrical Characteristics
Unless otherwise specified: VDD= 0.8V to 5.5V, TA=+25°C (note 1).
Parameter
Symbol
Conditions
+25°C
VDD=1.5V
-40°C to +125°C
Supply current (note 2)
IDD
VDD=3.3V
VDD=5.0V
Threshold voltage
(note 3)
VTH
Min
-
+25°C
-
-40°C to +125°C
-
+25°C
-
-40°C to +125°C
-
Typ
2.3
2.9
3.4
Max
4.6
Unit
7
5.5
8.3
µA
6.3
9.6
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
EM6354 – 4.6
4.561
4.63
V
4.699
Threshold voltage
∆VTH
temperature coefficient
ppm/°C
TA = -40°C to +125°C
±50
∆TA
(note 4)
Threshold hysteresis
VHYS
2.1%•VTH
V
Note 1: Production tested at +25°C only. Over temperature limits are guaranteed by design, not production tested.
VDD min=0.9V for active-high versions (EM6354Z).
Note 2: RESET (RESET) open.
Note 3: Threshold voltage is specified for VDD falling.
Note 4: Typical variation ∆VTH of VTH at a given temperature TA is calculated as follows:
∆VTH (T = TA ) =
∆VTH
× VTH × TA − 25°C
∆TA
Example:
-6
for version VTH=2.93V, variation at TA=70°C is equal to ∆VTH(70°C)=±50•10 x 2.93 x (70-25)=±6.59mV
Copyright © 2006, EM Microelectronic-Marin SA
03/06 – rev.I
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EM6354
Electrical Characteristics
(continued)
Unless otherwise specified: VDD= 0.8V to 5.5V, TA=+25° C (note 1).
Parameter
Symbol
Reset timeout period
Propagation delay time
VDD to RESET (RESET) delay
Open-drain RESET output
Voltage
tPOR
tP
Conditions
CD=100nF (measured value, note 5)
VDD from 0V to VTH (typ)+15% (note 2)
EM6354-4.6 version
VDD drops from VTH (typ)+0.2V to VTH (typ)-0.2V
(note 2)
VOL
VOL
-40°C to +125°C
Push-pull RESET / RESET
Output voltage
VOH
-40°C to +125°C
Typ
Max
Unit
72
100
122
ms
2
130
255
µs
-
-
0.3
VDD>2.5V
IOL=100µA
IOL=1.5mA
-
-
0.3
VDD>5V
IOL=3mA
-
-
0.3
VDD>1V
-
-
0.3
VDD>2.5V
IOL=100µA
IOL=1.5mA
-
-
0.3
VDD>5V
IOL=3mA
-
-
0.3
VDD>1V
0.8
-
-
VDD>2.5V
IOH=-30µA
IOH=-1.5mA
2
-
-
VDD>5V
IOH=-3mA
4
-
-
VDD>1V
-40°C to +125°C
Min
V
V
Output leakage current
ILEAK
-40°C to +125°C, only for EM6354Y (open-drain)
0.5
µA
Note 1: Production tested at +25°C only. Over temperature limits are guaranteed by design, not production tested.
VDD min=0.9V for active-high version (EM6354Z).
Note 2: RESET (RESET) open.
Note 5: tPOR is programmable by varying the value of the external capacitor connected to pin CD. The relation is tPOR (ms) =
CD (nF). The tolerance of the capacitor should be taken into account.
Timing Waveforms
tSEN
VDD
VTH
Overdrive
VHYS
0.8V
t
logic "1"
tPOR
RESET
tP
logic "0"
t
logic "1"
RESET
RESET
logic "0"
t
Note 6: tSEN = Maximum Transient Duration. Please refer to figure on the next page.
Note 7: Overdrive = VTH -VDD. Please refer to figure on the next page.
Copyright © 2006, EM Microelectronic-Marin SA
03/06 – rev.I
4
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EM6354
Typical Reset Timeout Period
The Reset Timeout Period (tPOR) is programmable using an external capacitor connected to pin CD of EM6354. A ceramic
chip capacitor rated at or above 10V is sufficient. The Reset Timeout Period (tPOR) can be calculated using the following
formula for VTH =4.63V (EM6354-4.6):
tPOR (ms) = CD (nF).
For example a CD of 100nF will achieve a tPOR of 100 ms. The tolerance of the capacitor should be taken into account. If no
delay due to tPOR is needed in a certain application, the circuit EM6352 should be used instead.
For threshold voltage between VTH=4.63V and VTH=1.31V , the following graphic applies :
130
120
[ ms ]
110
100
1.31
2.93
4.63
VTH
Typical Reset Timeout Period tPOR vs. VTH for CD=100nF at TA=+25°C
[ms]
10000
VTH = 1.31 V
1000
VTH = 4.63 V
100
10
1
1
10
100
1000
10000
[nF]
Reset Timeout Period tPOR vs. Capacitor CD at TA=+25°C
Copyright © 2006, EM Microelectronic-Marin SA
03/06 – rev.I
5
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EM6354
Typical Operating Characteristics
(Typical values are at TA=+25°C unless otherwise noted, RESET or RESET open.)
200%
200%
tPOR (°C)
175%
175%
tPOR (25°C)
150%
tP (°C)
tP (25°C)
150%
125%
125%
100%
100%
75%
75%
50%
50%
25%
25%
0%
0%
-50 -25
0
25
50
-50 -25
75 100 125
0
[°C]
75 100 125
Propagation Time tP vs. Temperature
(normalized with respect to tP 25°C)
7
400
VDD 3 . 3 V
6
350
300
5
VDD 5 . 0 V
4
[ us ]
3
VDD 1. 5 V
2
250
Reset occurs
above this line
200
150
100
1
0
-50
50
[°C]
Reset Timeout Period tPOR vs. Temperature
(normalized with respect to tPOR 25°C)
[ uA ]
25
50
-25
0
25
50
75
0
100 125
1
[ °C ]
10
100
1000
[ mV ]
IDD vs. Temperature
Maximum Transient Duration tSEN
vs. Overdrive VTH-VDD
8%
6%
4%
2%
0%
-2%
-4%
-6%
-8%
-50
-25
0
25
50
75
100
125
[°C]
Threshold Voltage Variation vs. Temperature (normalized)
Copyright © 2006, EM Microelectronic-Marin SA
03/06 – rev.I
6
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EM6354
Package Information
D
E1
SOT23-5L
C
A1 A2 A
b
L
E
e
SYM BOL
A
A1
A2
b
C
D
E
E1
e
e1
L
e1
M IN
0.90
0.05
0.90
0.35
0.08
2.80
2.60
1.50
TYP
1.30
0.08
1.15
2.90
2.80
M AX
1.45
0.15
1.30
0.50
0.20
3.00
3.00
1.75
0.95
1.90
0.45
Dimensions are in mm
SC70-4L
D
e
e
L
HE
E
PIN 1
e1
b
A2
Q1
b1
A
A1
SYMBOL
e
e1
D
b
b1
E
HE
Q1
A2
A1
A
c
L
MIN
MAX
0.65 BSC
0.5 BSC
1.80
2.20
0.15
0.30
0.575
0.70
1.15
1.35
1.80
2.40
0.10
0.40
0.80
1.00
0.00
0.10
0.80
1.10
0.10
0.18
0.10
0.30
c
NOTE:
" All dimensions are in millimeters
" Dimensions are inclusive of plating
" Dimensions are exclusive of mold flash & metal burr
" All specifications comply to EIAJ SC70
" Even though the width of pin 2 on SC70-4L is slightly larger than on socalled 4-pin SC-82AB, the footprint of SC70-4L package is compatible
with the footprint of SC-82AB package from other suppliers, and thus
suitable for pin-to-pin replacement. Please check footprint on PCB.
Traceability for small packages
Due to the limited space on the package surface, the bottom marking contains a limited number of characters that provide only partial
information for lot traceability. Full information for complete traceability is however provided on the packing labels of the product at delivery
from EM. It is highly recommended that the customer insures full lot traceability of EM product in his final product.
EM Microelectronic-Marin SA (EM) makes no warranty for the use of its products, other than those expressly contained in the Company's
standard warranty which is detailed in EM's General Terms of Sale located on the Company's web site. EM assumes no responsibility for
any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without
notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual
property of EM are granted in connection with the sale of EM products, expressly or by implications. EM's products are not authorized for
use as components in life support devices or systems.
Product qualification is performed according to internal EM quality standards for industrial products. For any special requirement (eg. automotive grade) please
contact EM Microelectronic-Marin S.A.
Copyright © 2006, EM Microelectronic-Marin SA
03/06 – rev.I
7
www.emmicroelectronic.com