Document
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
www.DataSheet4U.com
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
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 © 2006, EM Microelectronic-Marin SA 03/06 – rev.I
1
www.emmicroelectronic.com
EM6354
www.DataSheet4U.com
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 © 2006, EM Microelectronic-Marin SA 03/06 – rev.I
2
w.