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EM MICROELECTRONIC-MARIN SA Reset Circuit with Adjustable Delay
Description
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 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. 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 2.9A make the EM6354 an ideal choice for portable and battery-operated devices.
EM6354
Features
! ! ! ! ! !
Adjustable reset timeout period using an external capacitor Ultra-low supply current of 2.9A (VDD=3.3V) Operating temperature range: -40C to +125C 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: Active-low RESET push-pull 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
! ! ! !
Typical Application
VDD
VDD RESET
Applications
!
*
VDD RESET
! ! ! ! ! ! !
EM6354
CD GND
MPU, DSP
GND
GND * REXT for open-drain version only
Home appliances Modems Routers, hubs and gateways WAN, LAN Handheld GPS Metering and Instrumentation TV sets Automotive systems
Block Diagram
VDD Voltage Reference 1 2 4 3 GND
Pin Configuration (top view)
RESET (RESET) V DD GND 1 2 3 4 NC 5 CD RESET (RESET) V DD
+
Delay Circuit
RESET (RESET)
CD
SOT23-5L
SC70-4L
(SC-82AB) GND CD
Pin Description
SOT23-5L
1 2 3 4 5
Pin SC70-4L
1
Name
RESET RESET
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]
2 4 3
VDD GND N.C. CD
Copyright (c) 2006, EM Microelectronic-Marin SA 03/06 - rev.I
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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)
Part Number Top Marking Top 1) Marking with 4 Characters
2)
Part Number
Top Marking Top 1) Marking with 4 Characters
2)
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)
KC## KA##
K4## KB##
AMAA AMAE BMAE AMAG AMAH BMAH AMAL AMAA AMAE AMAG BMAG AMAH AMAL BMAL AMAT AMAW
EM6354YSP5B-4.6 EM6354YSP5B-4.6+ EM6354XSP5B-1.3 EM6354XSP5B-1.8 EM6354XSP5B-2.6 EM6354XSP5B-2.9
K1##
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
EM6354XSC4B-2.6+ EM6354XSC4B-4.6
Part Number
EM6354XSP5B-2.9+ 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 (c) 2006, EM Microelectronic-Marin SA 03/06 - rev.I
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EM6354
Absolute Maximum Ratings
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 250C x 10s Storage Temperature Range TSTG -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 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=+25C (note 1). Parameter Symbol Conditions +25C VDD=1.5V -40C to +125C Supply current (note 2) IDD VDD=3.3V VDD=5.0V +25C -40C to +125C +25C -40C to +125C
Min 1.290 1.359 1.546 1.635 1.773 2.167 2.591 2.886 3.034 4.334 4.561
Typ
2.3 2.9 3.4 1.31 1.38 1.57 1.66 1.80 2.20 2.63 2.93 3.08 4.40 4.63
Max 4.6
7 5.5 8.3 6.3 9.6 1.330 1.401 1.594 1.685 1.827 2.233 2.669 2.974 3.126 4.466
Unit
A
EM6354 - 1.3 EM6354 - 1.4 EM6354 - 1.6 EM6354 - 1.7 Threshold voltage (note 3) EM6354 - 1.8 VTH EM6354 - 2.2 EM6354 - 2.6 EM6354 - 2.9 EM6354 - 3.1 EM6354 - 4.4 EM6354 - 4.6
V
4.699 Threshold voltage VTH temperature coefficient ppm/C TA = -40C to +125C 50 TA (note 4) Threshold hysteresis VHYS 2.1%*VTH V Note 1: Production tested at +25C 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 x VTH x TA - 25C TA
Example: -6 for version VTH=2.93V, variation at TA=70C is equal to VTH(70C)=50*10 x 2.93 x (70-25)=6.59mV
Copyright (c) 2006, EM Microelectronic-Marin SA 03/06 - rev.I
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EM6354
Electrical Characteristics
Parameter
Reset timeout period Propagation delay time VDD to RESET (RESET) delay Open-drain RESET output Voltage
(continued)
Unless otherwise specified: VDD= 0.8V to 5.5V, TA=+25 C (note 1).
Symbol
tPOR tP 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)
VDD>1V -40C to +125C VDD>2.5V VDD>5V VDD>1V IOL=100A IOL=1.5mA IOL=3mA IOL=100A IOL=1.5mA IOL=3mA IOH=-30A IOH=-1.5mA IOH=-3mA
Min
72 2 0.8 2 4
Typ
100 130 -
Max
122 255 0.3 0.3 0.3 0.3 0.3 0.3 -
Unit
ms
s
V
VOL Push-pull RESET / RESET Output voltage VOH
-40C to +125C
VDD>2.5V VDD>5V VDD>1V
V
-40C to +125C
VDD>2.5V VDD>5V
Output leakage current ILEAK -40C to +125C, only for EM6354Y (open-drain) 0.5 A Note 1: Production tested at +25C 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" RESET logic "0" t logic "1"
tPOR tP
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 (c) 2006, EM Microelectronic-Marin SA 03/06 - rev.I
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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 VTH
4.63
Typical Reset Timeout Period tPOR vs. VTH for CD=100nF at TA=+25C
[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=+25C
Copyright (c) 2006, EM Microelectronic-Marin SA 03/06 - rev.I
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EM6354
Typical Operating Characteristics
(Typical values are at TA=+25C unless otherwise noted, RESET or RESET open.)
200% 175% 150% 125% 100% 75% 50% 25% 0% -50 -25 0 25 50 75 100 125 [C] tPOR (C) tPOR (25C)
200% 175% 150% 125% 100% 75% 50% 25% 0% -50 -25 0 25 50 75 100 125 tP (C) tP (25C)
[C]
Reset Timeout Period tPOR vs. Temperature (normalized with respect to tPOR 25C)
Propagation Time tP vs. Temperature (normalized with respect to tP 25C)
7 6 5 [ uA ] 4 3 2 1 0 -50
VDD 1. 5 V VDD 5 . 0 V VDD 3 . 3 V
400 350 300 [ us ] 250 200 150 100 50 Reset occurs above this line
-25
0
25
50 [ C ]
75
100 125
0 1 10 [ mV ] 100 1000
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 (c) 2006, EM Microelectronic-Marin SA 03/06 - rev.I
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EM6354
Package Information
D
A1 A2 A SOT23-5L
E1
C L
b e
SYM BOL A A1 A2 b C D E E1 e e1 L
E
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 0.95 1.90 0.45
M AX 1.45 0.15 1.30 0.50 0.20 3.00 3.00 1.75
e1
Dimensions are in mm
D e e
SC70-4L
L
HE
E
PIN 1
e1 b b1 Q1
A2
A
A1
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.
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
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 (c) 2006, EM Microelectronic-Marin SA 03/06 - rev.I
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