em6324qysp5b-2.8 EM Microelectronic, em6324qysp5b-2.8 Datasheet

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em6324qysp5b-2.8

Manufacturer Part Number
em6324qysp5b-2.8
Description
Reset Circuit With Manual Reset And Watchdog
Manufacturer
EM Microelectronic
Datasheet
Description
The EM6323/24 are low power, high precision reset ICs
featuring a manual reset and a watchdog inputs. They have
different threshold voltages and several timeout reset periods
(t
flexibility in the application. EM6323 has a manual reset (
with internal pull-up) and a watchdog input pins. EM6324 has
only a watchdog input pin (WDI). The watchdog function can
be disabled by driving WDI with a three-state driver or by
leaving WDI unconnected. This is useful when the MCU is in
sleep mode.
Small SOT23-5L package as well as ultra-low supply current
of 3.8μA make the EM6323 and the EM6324 an ideal choice
for portable and battery-operated devices.
Typical Application
Block Diagram
Pin Description
Copyright © 2006, EM Microelectronic-Marin SA
09/06 - rev.J
EM6323 EM6324
POR
GND
WDI
V
MR
DD
GND
V
) and watchdog timeout periods (t
1
2
3
4
5
-
SOT23-5L
DD
Transition
Reset Circuit with Manual Reset and Watchdog
Detector
1
2
3
4
5
-
EM MICROELECTRONIC
MR
EM632x
RESET
RESET
Name
GND
WDI
Reference
MR
V
Voltage
GND
Filter
DD
V
DD
RESET
RESET
WDI
Watchdog Logic
Active-low
Ground
Manual Reset input with an internal pull-up 30k Ω resistor. Reset remains active as long as MR is low
and for t
Active-high RESET output (push-pull)
Watchdog input. WDI must be driven with a CMOS output. If the microcontroller I/O is put in a high
impedance condition, the circuit will detect this condition as a microcontroller in sleep mode and prevent
its watchdog from timing out
Supply Voltage (5.5V max.)
+ Timer
+
-
*
R
EXT
*
for open-drain version only
POR
I/O
RESET
RESET
MPU, DSP
RESET
Oscillator
after returns high. MR can be driven with a CMOS output or shorted to ground with a switch
+ Timer
Reset
Logic
WD
GND
V
) for maximum
DD
output (push-pull or open-drain)
RESET
RESET
Fig. 1
Fig. 2
MR
- MARIN SA
1
Features
Applications
Pin Configuration
RESET
EM6323
GND
MR
Ultra-low supply current of 3.8μA (V
Operating temperature range: -40°C to +125°C
±1.5% reset threshold accuracy
11 reset threshold voltages V
2.93V, 2.8V, 2.63V, 2.3V, 2.2V, 2.0V, 1.8V, 1.66V,
1.57V, 1.38V, 1.31V
200ms reset timeout period (1.6ms, 25ms, 1600ms on
request)
1.6s watchdog timeout period (6.2ms, 102ms, 25.6s on
request)
3 reset output options:
Detection of microcontroller in sleep mode
Workstations
Point of sales (POS)
Personal computers
Routers, hubs and switches
Handheld GPS
Vending machines and ATM
Automotive systems
Function
SOT23-5
1
2
3
Active-low
Active-low
Active-high
(manual reset,
watchdog)
top view
5
4
V
WDI
DD
RESET
RESET
RESET
EM6323/24
push-pull/open-drain
push-pull
open-drain
push-pull
www.emmicroelectronic.com
EM6324
RESET
RESET
push-pull
GND
TH
SOT23-5
: 4.63V, 4.4V, 3.08V,
1
2
3
(watchdog)
DD
=3.3V)
top view
5
4
Fig. 3
V
WDI
DD

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em6324qysp5b-2.8 Summary of contents

Page 1

... V Supply Voltage (5.5V max.) DD Copyright © 2006, EM Microelectronic-Marin SA 09/06 - rev.J - MARIN SA Features Ultra-low supply current of 3.8μA (V Operating temperature range: -40°C to +125°C ±1.5% reset threshold accuracy ...

Page 2

... Top Part Number Marking EM6323LZSP5B-2.6 EM6323LXSP5B-2.6 KF## EM6323LXSP5B-2.6+ EM6323LXSP5B-2.9 K0## EM6323LXSP5B-2.9+ EM6323LXSP5B-3.1 EM6323LYSP5B-2.9 K6## EM6323LYSP5B-2.9+ EM6323LYSP5B-3.1 EM6323LXSP5B-3.1 EM6324LXSP5B-4.4 K9## EM6324LXSP5B-4.4+ EM6324LYSP5B-2.9 EM6324QXSP5B-1.4 KH## EM6324QYSP5B-2.0+ KJ## EM6324QYSP5B-2.3+ KK## EM6324QYSP5B-2.8+ www.emmicroelectronic.com Top Marking 1) with 4 2) characters APL5 APLG BPLG APLH BPLH APLJ APLU BPLU APLV APLJ AQMK BQMK AQLU AQQB ...

Page 3

... Electrical Characteristics Unless otherwise specified 0.9V to 5.5V Parameter Symbol Supply current (note Threshold voltage V TH (note 3) Copyright © 2006, EM Microelectronic-Marin SA 09/06 - rev.J Part Number EM6323LYSP5B-2.9+ EM6324LXSP5B-4.4+ Handling Procedures Conditions This device has built-in protection against high static V -0.3V to +6V voltages DD V GND - 0.3V ...

Page 4

... Note 1: Production tested at +25°C only. Over temperature limits are guaranteed by design, not production tested. Note 3: Threshold voltage is specified for V Copyright © 2006, EM Microelectronic-Marin SA 09/06 - rev.J -40°C to +125°C +25°C EM6323/24 – 2.9 -40°C to +85°C -40°C to +125°C +25°C EM6323/24 – 3.1 -40°C to +85°C -40° ...

Page 5

... Note 5: Pulse width must be greater than 1μs to ensure the Note 6: Standard version for t is 1600ms (typ). Other option (6.2ms, 102ms, 25.6s) are available by mask option and WD upon minimum order quantity. Please contact EM sales. Copyright © 2006, EM Microelectronic-Marin SA 09/06 - rev.J =-40°C to +125° C (note 1). A Conditions T =+25° ...

Page 6

... RESET logic "0" Note Maximum Transient Duration. Please refer to figure on the next page. SEN Note 8: Overdrive = Please refer to figure on the next page Copyright © 2006, EM Microelectronic-Marin SA 09/06 - rev.J t SEN Overdrive t PMD t t POR MD t ...

Page 7

... I vs. Temperature DD 160% 140% 120% 100% 80% 60% -50 - °C ] Reset Timeout Period t vs. Temperature POR (normalized with respect to t Copyright © 2006, EM Microelectronic-Marin SA 09/06 - rev RESET - -4% -6% 75 100 125 Fig. 6 Threshold Voltage Variation vs. Temperature ...

Page 8

... Propagation Time t vs. Temperature PHL 250 225 200 [ ns ] 175 150 125 100 -50 - °C ] Watchdog Input Pulse Width t WP Copyright © 2006, EM Microelectronic-Marin SA 09/06 - rev RESET 120 100 100 125 Fig. 10 350 300 250 [ ns ] 200 150 ...

Page 9

... RESET asserted it stays low for the reset timeout period. Any time V goes below the reset threshold the internal DD timer restarts. is the inverse of RESET. RESET Copyright © 2006, EM Microelectronic-Marin SA 09/06 - rev.J High Impedance t POR Manual Reset Input (EM6323 only) A logic low on asserted while EM6323 C-G-L-Q) after it returns high ...

Page 10

... WDI Input Current Low-level I vs. Temperature IL (V =5.5V) DD Copyright © 2006, EM Microelectronic-Marin SA 09/06 - rev.J When WDI is left unconnected, this internal driver clears WD the 1.6s timer every 1.5s. When WDI is three-stated or unconnected, the maximum allowable leakage current is 0.5µA. To minimized the overall system power consumption and ...

Page 11

... EM 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 ...

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