EM6354 Data Sheet

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 V DD
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.

Typical Application






Active-low RESET push-pull




*

VDD

VDD
RESET
EM6354
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 package
Applications

VDD
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

MPU, DSP


CD
Home appliances
Modems
Routers, hubs and gateways
WAN, LAN
Handheld GPS
Metering and Instrumentation
TV sets
GND
GND
Block Diagram
GND
* REXT for open-drain version only
VDD
Voltage
Reference
Pin Configuration (top view)
RESET
(RESET)
1
VDD
2
GND
3
5
Delay
Circuit
+
CD
RESET
(RESET)
4 NC
SOT23-5L
CD
GND
Pin Description
Pin
SOT23-5L
Name
RESET
1
RESET
2
3
4
VDD
GND
N.C.
5
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]
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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)
1)
2)
Part Number
Top
Top Marking 2)
Marking1)
with 4
Characters
EM6354XSP5B-1.8+
EM6354XSP5B-2.9+
EM6354YSP5B-4.6+
KC##
KA##
K1##
BMAH
BMAX
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
EM6354XSP5B-1.8+
EM6354XSP5B-2.9+
EM6354YSP5B-4.6+
Sample stock is generally held on standard versions only. Please contact factory for other versions not shown here and
for availability of non standard versions.
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Absolute Maximum Ratings
Handling Procedures
Parameter
Symbol
Conditions
Voltage at VDD to GND
VDD
-0.3V to +6V
Minimum voltage at any signal
VMIN
GND - 0.3V
pin
Maximum voltage at any signal
VMAX
VDD + 0.3V
pin
Electrostatic discharge max. to
MIL-STD-883C method 3015.7
VESD
2000V
with ref. to VSS
Max. soldering conditions
TMAX
250°C x 10s
Storage Temperature Range
TSTG -65°C to +150°C
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.
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
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
+25°C
Supply current (note 2)
IDD
VDD=3.3V
-40°C to +125°C
+25°C
VDD=5.0V
-40°C to +125°C
EM6354 – 1.3
Threshold voltage
(note 3)
VTH
Min
-
Typ
2.3
2.9
3.4
Max
4.6
7
5.5
8.3
6.3
1.290
1.31
9.6
1.330
EM6354 – 1.4
EM6354 – 1.6
1.359
1.546
1.38
1.57
1.401
1.594
EM6354 – 1.7
EM6354 – 1.8
1.635
1.773
1.66
1.80
1.685
1.827
EM6354 – 2.2
EM6354 – 2.6
2.167
2.591
2.20
2.63
2.233
2.669
EM6354 – 2.9
EM6354 – 3.1
2.886
3.034
2.93
3.08
2.974
3.126
EM6354 – 4.4
EM6354 – 4.6
4.334
4.561
4.40
4.63
4.466
4.699
Unit
A
V
Threshold voltage
VT H
temperature coefficient
TA = -40°C to +125°C
ppm/°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 ΔVTH of VTH at a given temperature TA is calculated as follows:
VT H(T  TA ) 
VT H
 VT H  TA  25C
TA
Example:
for version VTH=2.93V, variation at TA=70°C is equal to ΔVTH(70°C)=±5010-6 x 2.93 x (70-25)=±6.59mV
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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
VOL
VOL
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)
-40°C to +125°C
-40°C to +125°C
Push-pull RESET / RESET
Output voltage
VOH
-40°C to +125°C
Min
Typ
Max
Unit
72
100
122
ms
2
130
255
s
V
VDD>1V
VDD>2.5V
IOL=100A
IOL=1.5mA
-
-
0.3
0.3
VDD>5V
VDD>1V
IOL=3mA
-
-
0.3
0.3
-
-
0.3
0.3
0.8
2
-
-
VDD>2.5V
VDD>5V
IOL=100A
IOL=1.5mA
IOL=3mA
VDD>1V
VDD>2.5V
IOH=-30A
IOH=-1.5mA
V
VDD>5V
IOH=-3mA
4
Output leakage current
ILEAK
-40°C to +125°C, only for EM6354Y (open-drain)
0.5
A
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 C D. 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.
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Typical Reset Timeout Period
The Reset Timeout Period (tPOR) 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 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
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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]
25
50
75 100 125
[°C]
Reset Timeout Period tPOR vs. Temperature
(normalized with respect to tPOR 25°C)
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
[ uA ]
250
4
[ us ]
Reset occurs
above this line
200
3
VDD 1. 5 V
150
2
100
1
50
0
-50
-25
0
25
50
75
0
100 125
1
10
[ °C ]
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)
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EM6354
Package Information
D
E1
SOT23-5L
C
A1 A2 A
b
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
L
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
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 warranties for the use of EM products, other than those expressly contained in EM's
applicable General Terms of Sale, located at http://www.emmicroelectronic.com. EM assumes no responsibility for any errors which may
have crept into 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 rights of EM are granted in connection with the sale of EM products, neither expressly
nor implicitly.
In respect of the intended use of EM products by customer, customer is solely responsible for observing existing patents and other
intellectual property rights of third parties and for obtaining, as the case may be, the necessary licenses.
Important note: The use of EM products as components in medical devices and/or medical applications, including but not limited
to, safety and life supporting systems, where malfunction of such EM products might result in damage to and/or injury or death
of persons is expressly prohibited, as EM products are neither destined nor qualified for use as components in such medical
devices and/or medical applications. The prohibited use of EM products in such medical devices and/or medical applications is
exclusively at the risk of the customer
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.
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