EM MICROELECTRONIC-MARIN SA
EM6354
Reset Circuit with Adjustable Delay
Description
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:
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 open-
drain 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
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
!
!
!
!
!
!
!
!
Home appliances
VDD
Modems
VDD
*
VDD
Routers, hubs and gateways
WAN, LAN
RESET
RESET
Handheld GPS
MPU, DSP
EM6354
CD
Metering and Instrumentation
TV sets
GND
GND
Automotive systems
GND
*
REXT for open-drain version only
Block Diagram
VDD
Pin Configuration (top view)
Voltage
Reference
-
RESET
RESET
1
2
3
5
CD
RESET
(RESET)
Delay
(RESET)
1
2
4
3
GND
CD
Circuit
VDD
(RESET)
+
VDD
4
NC
GND
SOT23-5L
SC70-4L (SC-82AB)
CD
GND
Pin Description
Pin
Name
Function
SOT23-5L
SC70-4L
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.
RESET
RESET
1
1
2
3
4
2
4
-
VDD
GND
N.C.
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]
5
3
CD
1
www.emmicroelectronic.com
Copyright © 2006, EM Microelectronic-Marin SA
03/06 – rev.I
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