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Part: EM63542.93
Category:
Description: Reset Circuit With Adjustable Delay
Company: EM Microelectronic
Datasheet: Download EM63542.93 datasheet File size : 513 kB
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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 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.
EM6354
Features
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: 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
V DD
VDD RESET
Applications
*
VDD RESET
EM6354
CD GND
MPU, DSP
GND
GND * REXT for open-drain version only
Microprocessor & microcontroller systems Portable/Battery-Powered equipment Notebook/desktop computers Wireless communication Automotive Household appliances Industrial electronics
Block Diagram
VDD Voltage Reference 1 2 4 3 G ND
Pin Configuration (top view)
RESET (R ESET ) VDD G ND 1 2 3 4 NC 5 CD RESET (R ESET ) VDD
+
Delay Circuit
RESET (RESET)
CD
S O T 2 3 -5 L
S C 7 0 -4 L
(SC-82AB) GND CD
Pin Description
SOT23-5L 1 2 3 4 5 Pin SC70-4L 1 RESET 2 4 3 VDD GND N.C. CD Name
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]
Copyright 2002, EM Microelectronic-Marin SA
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EM6354
Ordering Information
EM6354 X SP5B - 2.9
Reset Threshold Voltage: 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 = 5-pin SOT23-5, Tape & Reel, 3000 units SC4B = 4-pin SC70-4, Tape & Reel, 3000 units Reset Output Type: X = Active-low /RESET push-pull Y = Active-low /RESET open-drain Z = Active-high RESET push-pull
Standard versions in bold
Standard Versions
The versions below are considered standard and should be readily available. For other versions, please contact EM Microelectronic. Please make sure to give the complete Part Number when ordering. All parts are offered in tape-and-reel only.
Threshold Voltage 1.31V 1.80V 2.63V 2.93V 4.63V Top Marking AMAA AMAE AMAG AMAH AMAL
Output Type Active-low push-pull Active-low push-pull Active-low push-pull Active-low push-pull Active-low push-pull
Package SOT23-5L SC70-4L SOT23-5L SC70-4L SOT23-5L SC70-4L SOT23-5L SC70-4L SOT23-5L SC70-4L
Part Number EM6354XSP5B-1.3 EM6354XSC4B-1.3 EM6354XSP5B-1.8 EM6354XSC4B-1.8 EM6354XSP5B-2.6 EM6354XSC4B-2.6 EM6354XSP5B-2.9 EM6354XSC4B-2.9 EM6354XSP5B-4.6 EM6354XSC4B-4.6
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EM6354
Absolute Maximum Ratings
Parameter Symbol Conditions Voltage at VDD to GND VDD -0.3V to +6V Minimun voltage at reset VMIN GND - 0.3V Maximun voltage at reset VMAX VDD + 0.3V 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.
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=+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 1.31 EM6354 1.38 EM6354 1.57 EM6354 1.66 EM6354 1.80 VTH EM6354 2.20 EM6354 2.63 EM6354 2.93 EM6354 3.08 EM6354 4.40 EM6354 4.63 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 4.699 V Unit
µA
Threshold voltage (note 3)
Threshold voltage VTH TA = -40°C to +125°C p p m / °C temperature coefficient ±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
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EM6354
Electrical Characteristics (continued)
Unless otherwise specified: VDD= 0.8V to 5.5V, TA=+25° C (note 1). Parameter Reset timeout period Propagation delay time VDD to RESET (RESET) delay Open-drain RESET output Voltage 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 -40°C to +125°C VDD>2.5V VDD>5V VDD>1V VDD>2.5V VDD>5V VDD>1V VOH -40°C to +125°C VDD>2.5V VDD>5V IOL=100µA IOL=1.5mA I OL = 3 m A IOL=100µA IOL=1.5mA I OL = 3 m A IOH=-30µA IOH=-1.5mA IOH=-3mA Min 59 2 0.8 2 4 Typ 100 130 Max 122 255 0 .3 0.3 0.3 0 .3 0.3 0.3 µA V V Unit ms µs
VOL Push-pull RESET / RESET Output voltage
-40°C to +125°C
Output leakage current ILEAK -40°C to +125°C, only for EM6354Y (open-drain) 0.5 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 VT H
Overdrive
VHYS
0.8V t logic "1" RESET logic "0" t logic "1"
tPOR tP
RESE RESETT
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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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=+25°C
[ms ] 10000 V TH = 1.31 V 1000
V TH = 4.63 V 100
10
1 1 10 100 1000 10000 [nF]
Reset Timeout Period tPOR vs. Capacitor CD at TA=+25°C
Copyright 2002, EM Microelectronic-Marin SA
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