EM MICROELECTRONIC
- MARIN SA
Reset Circuit with Fixed Delay
Description
The EM6353 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擄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 after a
fixed reset timeout period. The threshold defines the
minimum allowed voltage which guarantees the good
functionality of the system. When V
DD
rises above V
TH
, the
output remains active for an additional delay time. This
allows the system to stabilize before getting fully active.
The EM6353 features three output types: active-low push-
pull, active-low open-drain and active-high push-pull.
Small SC70-5L and SOT23-3L packages as well as ultra-low
supply current of 2.9碌A(chǔ) make the EM6353 an ideal choice
for portable and battery-operated devices.
EM6353
Features
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200ms reset timeout period (25ms on request)
Ultra-low supply current of 2.9碌A(chǔ) (V
DD
=3.3V)
Operating temperature range: -40擄C to +125擄C
鹵1.5%
reset threshold accuracy
11 reset threshold voltages V
TH
: 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
No external components
Immune to short negative V
DD
transients
Guaranteed Reset valid down to 0.8V
Threshold hysteresis: 2.1% of V
TH
Very small SOT23-3L and SC70-5L packages
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Typical Application
V
DD
V
DD
RESET
*
V
DD
RESET
Applications
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3 GND
EM6353
GND
MPU, DSP
GND
GND
*
R
EXT
for open-drain version only
Pin Configuration
(top view)
GND
1
3
RESET 2
(RESET)
V
DD
V
DD
2
RESET 1
(RESET)
!
Mobile phones
Set-top boxes
Video, digital cameras, DVD players and recorders
Modems
Personal computers
Switching hubs
Copiers and fax
Utility meters
Automotive systems
SOT23-3L
"beta" bonding
NC
V
DD
NC
1
2
3
5 RESET
(RESET)
4 GND
SOT23-3L
"alpha" bonding
GND 4
RESET
5
(RESET)
3 NC
2 V
DD
1 NC
Block Diagram
V
DD
Oscillator
+
Voltage
Reference
(compatible with SC70-3 by rotating 180擄)
SC70-5L
-
Reset
Logic
RESET
RESET
GND
Pin Description
Pin
SOT23-3L
鈥渂eta鈥?/div>
1
Function
SC70-5L
4
SOT23-3L
鈥渁lpha鈥?/div>
3
Name
GND
Ground
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.)
Not connected. Not internally connected.
RESET
2
1
5
RESET
3
-
2
-
2
1,3
V
DD
N.C.
Copyright
漏
2006, EM Microelectronic-Marin SA
03/06 鈥?rev.K
1
www.emmicroelectronic.com
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