MIC2790/1/3
Supervisor with High-Accuracy,
Ultra-Fast Propagation Delay, and
Capacitor-Programmable Reset Delay
General Description
Features
The MIC2790/1/3 is ideal for monitoring highly-accurate
core voltages that require rapid response in the event of a
fault condition. The voltage supervisor IC features a
manual reset input, enable input (MIC2793 only), a
capacitor-programmable reset timeout delay and both an
active-low and active-high reset output.
1.5V to 5.5V operating supply voltage range
Ultra-fast propagation delay (1µs typically)
0.4V reference voltage (SNS pin)
±1.0% threshold accuracy from 40°C to +125°C
Monitored voltage range from 0.4V to 5.5V
Programmable reset timeout delay (from 1ms to 10s)
Manual reset input with an internal pull-up resistor
Active-high enable input pin (MIC2793 only)
The MIC2790/1/3 features multiple output options:
Open-drain active-low (/RESET)
Push-pull active-low (/RESET)
Push-pull active-high (RESET)
40°C to 125°C junction temperature range
6-pin TSOT-23 (MIC2790)
6-pin 2mm × 2mm Thin DFN (MIC2790)
6-pin 1.6mm × 1.6mm Thin DFN (MIC2791)
8-pin 2mm × 2mm Thin DFN (MIC2793)
The MIC2790/1/3 monitors system voltages that are in the
range of 0.4V to 5.5V, with a typical sense accuracy of
0.5% at +25°C and ±1.0% across 40°C to +125°C. The
IC asserts a reset output when the sense voltage drops
below the threshold or when the manual reset is pulled to
a logic low. The active-low reset stays low for the duration
of the reset timeout delay once the sense voltage returns
to normal and the manual reset transitions to a logic high
state. The reset timeout delay period is programmable
from 1ms to 10s with an external capacitor.
The MIC2790/1/3 operates from a low supply voltage of
1.5V to 5.5V, and is rated to operate over the temperature
range of 40˚C to +125˚C. The MIC2790 is available in a
6-pin TSOT-23 package or a 6-pin 2mm × 2mm × 0.55mm
DFN package. The MIC2791 is available in a tiny 6-pin
1.6mm × 1.6mm × 0.55mm DFN package. The MIC2793 is
available in a 8-pin 2mm × 2mm × 0.55mm DFN package.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Applications
Telecom
Computer/servers
Medical equipment
Portable
Set-top boxes
Critical microprocessor monitoring
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 22, 2014
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Ordering Information
Marking
Code
Threshold
Voltage
(1)
(SNS)
/RESET
Output
(ActiveLow)
RESET
Output
(ActiveHigh)
Enable
Pin
Feature
Junction
Temperature
Range
MIC2790N-04VD6
9NB
0.4V
Open-Drain
–40°C to +125°C
6-pin TSOT-23
MIC2790L-04VD6
9LB
0.4V
Push-Pull
–40°C to +125°C
6-pin TSOT-23
MIC2790H-04VD6
9LC
0.4V
Push-Pull
–40°C to +125°C
6-pin TSOT-23
MIC2790N-04VMT
9NA
0.4V
Open-Drain
–40°C to +125°C
6-pin 2mm × 2mm TDFN
MIC2791N-04VMT
1N
0.4V
Open-Drain
–40°C to +125°C
6-pin 1.6mm ×1.6mm TDFN
MIC2791L-04VMT
1L
0.4V
Push-Pull
–40°C to +125°C
6-pin 1.6mm × 1.6mm TDFN
MIC2791H-04VMT
XH
0.4V
Push-Pull
–40°C to +125°C
6-pin 1.6mm ×1.6mm TDFN
MIC2793LH-04VMT
3LH
0.4V
Push-Pull
Push-Pull
Yes
–40°C to +125°C
8-pin 2mm × 2mm TDFN
MIC2793NH-04VMT
3NH
0.4V
Open-Drain
Push-Pull
Yes
–40°C to +125°C
8-pin 2mm × 2mm TDFN
Part Number
Package
(2, 3)
Notes:
1. Other voltage options are available. Contact Micrel for details.
2. Thin DFN pin 1 identifier = “ ”.
3. Thin DFN is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen free.
Pin Configuration
RESET (/RESET)
1
6
VDD
VDD
1
6
RESET (/RESET)
GND
2
5
SNS
SNS
2
5
GND
/MR
3
4
CTH
CTH
3
4
/MR
6-Pin TSOT (D6)
(Top View)
6-Pin 1.6mm x 1.6mm TDFN (MT)
(Top View)
VDD
1
6
RESET (/RESET)
SNS
2
5
GND
CTH
3
EP
4
/MR
6-Pin 2mm x 2mm TDFN (MT)
(Top View)
May 22, 2014
EP
EN
1
8
RESET
VDD
2
7
/RESET
SNS
3
6
GND
CTH
4
5
/MR
EP
8-Pin 2mm x 2mm TDFN (MT)
(Top View)
2
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Pin Description
Pin
Number
TSOT-23
(6L)
1
Pin
Number
1.6 × 1.6
(6L)
6
Pin
Number
2×2
(6L)
6
Pin
Number
2×2
(8L)
7
Pin
Name
Pin Function
/RESET
/RESET is an active-low output pin and is available in an opendrain or push-pull configuration.
In the open-drain configuration, a pull-up resistor to VDD is
required and /RESET pin is asserted low when /MR is set to a
logic low or the SNS voltage decreases below the threshold
voltage. /RESET will remain low for the reset timeout delay after
SNS > (VTH + VHYST) and /MR is set to a logic high.
The push-pull configuration does not require a pull-up resistor and
behaves exactly the same as the open-drain configuration.
Reset is an active-high push-pull output and is asserted high when
/MR is set to a logic low or the SNS voltage decreases below the
threshold voltage. RESET will remain high for the reset timeout
delay after SNS > (VTH + VHYST) and /MR is set to a logic high.
1
6
6
8
RESET
2
5
5
6
GND
Supply Ground.
3
4
4
5
/MR
Manual reset is an active-low input logic level pin and is internally
pulled to VDD through a 90kΩ pull-up resistor. Pulling the /MR
input to a logic low asserts RESET and /RESET pins. /RESET will
remain low and RESET will remain high for the reset timeout delay
after /MR is pulled to logic high.
4
3
3
4
CTH
Programmable timeout delay. Connect a capacitor to ground to set
a user defined reset delay time.
5
2
2
3
SNS
Voltage monitor input. Connect sense pin to the voltage to be
monitored through a resistor divider. When this voltage decreases
below the threshold voltage, VTH, /RESET is asserted low and
RESET is asserted high.
6
1
1
2
VDD
Supply voltage pin. Bypass with a 1µF capacitor from this pin to
GND.
1
EN
EP
EP
EP
ePad
May 22, 2014
Enable input function is only available in the MIC2793 version.
This pin enables the /MR input function and RESET and /RESET
outputs. When EN is in a logic low state, the reset outputs are deasserted. The EN pin has an internal 90kΩ pull-up resistor to VDD.
Exposed Pad. Connect to ground plane.
3
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Absolute Maximum Ratings(4)
Operating Ratings(5)
Supply Voltage (VDD) .................................... 0.3V to +6.0V
SNS ................................................................ 0.3V to 4.5V
/MR, EN, CTH .................................................... 0.3V to VDD
RESET, /RESET .............................................. 0.3V to VDD
Lead Temperature (soldering, 10s) ............................ 260°C
Storage Temperature (TS) ......................... 55°C to +150°C
(6)
ESD Ratings ............................................... ESD Sensitive
Supply Voltage (VDD) .................................... +1.5V to +5.5V
SNS ..................................................................... 0V to 4.0V
/MR, EN, CTH ......................................................... 0V to VDD
RESET, /RESET ................................................... 0V to VDD
Junction Temperature (TJ) ........................ 40°C to +125°C
Junction Thermal Resistance
6-pin, TSOT-23 (JA) ..................................... 177.2°C/W
6-pin, 1.6mm × 1.6mm TDFN (JA) ................. 92.4°C/W
6-pin, 2mm × 2mm TDFN (JA) .......................... 90°C/W
8-pin, 2mm × 2mm TDFN (JA) .......................... 90°C/W
Electrical Characteristics(7)
VDD = 3.3V; R/RESET = 100kΩ; CTH = 1nF; TA = 25°C, bold values indicate 40°C ≤ TA ≤ +125°C, unless noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
5.5
V
Supply Specifications
VDD
IDD
Supply Voltage
Supply Current
1.5
/RESET Output Valid
VDD = EN = /MR = 3.3V
RESET and /RESET not asserted
40
70
VDD = EN = /MR = 5V
RESET and /RESET not asserted
50
80
µA
Sense Specifications
VTH
Sense Threshold Voltage
0.4
1.0
Sense Threshold Accuracy
VHYST
Hysteresis
ISNS
Sense Input Bias Current
2.5
Sense rising
1.5
15
V
+1.0
%
+2.5
%
+15
nA
2.2
µs
0.3
V
RESET & /RESET Output Specifications
tp,SNS
SNS to RESET and /RESET
(8)
Propagation Delay
SNS = VTH × 1.05 to VTH × 0.95
VOL
/RESET Logic Low Output
Voltage
IOL = 1mA (open-drain only)
VOH
RESET Logic High Output
Voltage
IOH ≤ 1mA (push-pull only)
IOH
/RESET Leakage Current
/RESET not asserted (open-drain only)
td
RESET and /RESET
Timeout Delay
CTH = 100pF
0.45
CTH = 180nF
0.5
1
>0.9 × VDD
V
1
µA
1.05
1.8
ms
1.2
1.9
s
Notes:
4. Exceeding the absolute maximum ratings may damage the device.
5. The device is not guaranteed to function outside its operating ratings.
6. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
7. Specification for packaged product only.
8. SNS to RESET and or /RESET propagation delay is the delay time for SNS voltage to transition from VTH × 1.05 to VTH × 0.95 to RESET and or
/RESET.
May 22, 2014
4
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Electrical Characteristics(7) (Continued)
VDD = 3.3V; R/RESET = 100kΩ; CTH = 1nF; TA = 25°C, bold values indicate 40°C ≤ TA ≤ +125°C, unless noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
/MR Input Specifications
R/MR
/MR Internal Pull-Up
Resistance
90
kΩ
tp,/MR
/MR to RESET and /RESET
Propagation Delay
100
ns
VIL
/MR Logic Low Input Voltage
VIH
/MR Logic High Input
Voltage
0.5
1.2
V
V
EN Input Specifications (MIC2793 only)
REN
EN Internal Pull-Up
Resistance
tp,EN
EN to RESET and /RESET
Propagation Delay
VENL
EN Logic Low Input Voltage
VENH
EN Logic High Input Voltage
May 22, 2014
/MR = logic low
90
kΩ
100
ns
0.5
1.2
5
V
V
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Typical Characteristics
Supply Current
vs. Supply Voltage
Reset Timeout Delay
vs. Supply Voltage
70
125 C
60
85 C
50
40
30
25 C
-40 C
20
RESET
RESET
NOT
notASSERTED
asserted
1.6
1.2
1
0.8
0.6
CTH = 100pF
3
4
5
1
6
2
Reset Timeout Delay
vs. CTH
RESET TIMEOUT DELAY (ms)
10000
1000
100
10
1
VDD = 3.3V
0.1
0.01
0.1
1
10
100
0.8
0.6
4
5
6
1
2
3
4
5
SUPPLY VOLTAGE (V)
Reset Timeout Delay
vs. Temperature
Reset Timeout Delay
vs. Temperature
1.7
1.8
1.6
1.7
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
VDD = 3.3V
CTH = 100pF
0.6
-40
1000 10000
-20
0
20
40
60
80
100
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
120
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Normalized SNS Threshold
vs. Supply Voltage
Normalized SNS Threshold
vs. Temperature
CTH Charging Current
vs. Supply Voltage
0.8%
0.6%
0.4%
SNS RISING
0.2%
0.0%
-0.2%
SNS FALLING
-0.6%
-0.8%
-1.0%
1
2
3
4
SUPPLY VOLTAGE (V)
May 22, 2014
5
6
6
VDD = 3.3V
CTH = 180nF
1.6
CTH (nF)
1.0%
-0.4%
3
0.5
NORMALIZED SNS THRESHOLD (%)
RESET TIMEOUT DELAY (ms)
100000
1
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
RESET TIMEOUT DELAY (s)
2
1.2
0.4
120
400
1.0%
CTH CHARGING CURRENT (nA)
1
1.4
CTH = 180nF
0.4
10
NORMALIZED SNS THRESHOLD (%)
RESET TIMEOUT DELAY (s)
1.4
RESET TIMEOUT DELAY (ms)
SUPPLY CURRENT (µA)
80
Reset Timeout Delay
vs. Supply Voltage
0.8%
0.6%
0.4%
SNS FALLING
0.2%
0.0%
-0.2%
SNS RISING
-0.4%
-0.6%
-0.8%
VDD = 3.3V
-1.0%
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
6
100
120
350
300
250
200
150
100
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Typical Characteristics (Continued)
SNS to Reset Propagation Delay
vs. Overdrive Voltage
SNS TO RESET PROP DELAY (µs)
8
7
6
5
4
3
2
VDD = 3.3V
1
0
0
50
100
150
200
OVERDRIVE VOLTAGE (mV)
May 22, 2014
7
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Timing Diagrams
Figure 1. Timeout and Propagation Delay from Sense to RESET and /RESET
Figure 2. Timeout and Propagation Delay from /MR to RESET and /RESET
May 22, 2014
8
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Timing Diagrams (Continued)
Figure 3. Hold and Propagation Delay from EN to RESET and /RESET
May 22, 2014
9
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Functional Diagram
Figure 4. Simplified MIC2793 Functional Block Diagram
May 22, 2014
10
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Functional Description
Design and Product Advantages
The MIC2790/1/3 is a highly-accurate supervisor circuit
with an ultra-fast propagation delay of 2.2µs (maximum)
over the temperature range of 40˚C to +125˚C.
Additional features in the MIC2790/1/3 include a manual
reset input pin, a capacitor-programmable reset timeout
delay and both an active-low and active-high reset
output. The capacitor-programmable reset delay help
protect against accidental system glitch during a reset
timeout.
To set RTOP and RBOTTOM, use Equation 1 and set an
arbitrary RTOP value greater than 100kΩ and solve for
RBOTTOM or vice versa.
RTOP
VMONITOR 0.4V 1
RBOTTOM
VDD
The input supply (VDD) provides power to the
comparators and logic timers. VDD operating range is
1.5V to 5.5V. A ceramic input capacitor of 1µF with a
minimum voltage rating of 6.3V is recommended between
VDD and GND. Refer to PCB Layout Recommendations
for details.
Eq. 1
GND
The ground (GND) pin is the return path for VDD, logic
gates, and output pins. Refer to PCB Layout
Recommendations for details.
/MR
Manual reset (/MR) is an active-low input pin that is
internally pulled to VDD with a 90kΩ resistor. When /MR
is asserted to a logic-low level, /RESET will transition to a
logic low state while RESET will transition to a logic high
state. See the Timing Diagrams section for more
information.
EN
The enable (EN) pin feature is only available in the
MIC2793 option and has an internal pull-up of 90kΩ
resistor to VDD. A logic high signal on EN pin enables the
reset logic outputs, while a logic low signal disables the
reset outputs. See Figure 3 in the Timing Diagrams
section for more information.
/RESET
/RESET is an active-low output and is available in two
output configurations: open-drain or push-pull. The opendrain configuration requires an external pull-up resistor,
while the push-pull does not.
CTH
CTH is a programmable timeout delay pin. Connect a
capacitor to ground to set a reset timeout delay ranging
from 1ms to 10s. Refer to the Reset Timeout Delay vs.
CTH plot in the Typical Characteristics section for
examples.
/RESET is asserted low when /MR is set to a logic-low or
the SNS voltage decreases below the threshold voltage.
/RESET will remain low for the programmed reset timeout
delay after SNS > (VTH + VHYST) and /MR is set to a logichigh, and then /RESET will transition high to indicate
normal regulation. See the Timing Diagrams section for
more information.
SNS
The sense (SNS) input pin monitors the user’s voltage
through a resistor divider network as shown in Figure 5.
RESET
RESET is an active-high push-pull output and is asserted
high when /MR is set to a logic low or the SNS voltage
decreases below the threshold voltage. RESET will
remain high for the programmed reset timeout delay after
SNS > (VTH + VHYST) and /MR is set to a logic high, and
then RESET will transition low to indicate normal
regulation. See the Timing Diagrams section for more
information.
VMONITOR
RTOP
SNS = 0.4V
RBOTTOM
Figure 5. Resistor Divider on SNS pin
May 22, 2014
11
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Typical Application Schematic
Bill of Materials
Item
Part Number
06036D225KAT2A
C1
GRM188R60J225KE19D
C1608X5R0J225KT
01016D102KAT2A
C2
Manufacturer
Description
Qty.
(9)
AVX
Murata
(10)
2.2µF, 6.3V, X5R, 0603
1
1nF, 6.3V, X5R, 0603
1
50kΩ, 1%, 1/10W, 0603
1
(11)
TDK
AVX
GRM155R60J102KA01D
Murata
C0402X5R0J102K020BC
TDK
Vishay/Dale
(12)
R1
CRCW060350K0FKEA
R2
CRCW060328K7FKEA
Vishay/Dale
28.7kΩ, 1%, 1/10W, 0603
1
R3
CRCW060313K7FKEA
Vishay/Dale
13.7kΩ, 1%, 1/10W, 0603
1
R5, R6
CRCW06031003FKEA
Vishay/Dale
100kΩ, 1%, 1/10W, 0603
2
U1
MIC2793NH-04VMT
Supervisor with High-Accuracy, Ultra-Fast Propagation
Delay, and Capacitor-Programmable Reset Delay
1
(13)
Micrel, Inc.
Notes:
9. AVX: www.avx.com.
10. Murata: www.murata.com.
11. TDK: www.tdk.com.
12. Vishay: www.vishay.com.
13. Micrel, Inc.: www.micrel.com.
May 22, 2014
12
Revision 1.2
Micrel, Inc.
MIC2790/1/3
PCB Layout Recommendations
Top Layer
Bottom Layer
May 22, 2014
13
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Package Information(14) and Recommended Land Pattern (TSOT-23-6L)
6-pin TSOT-23 (D6)
Note:
14. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
May 22, 2014
14
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Package Information(14) and Recommended Land Pattern (1.6mm × 1.6mm TDFN-6L)
6-pin 1.6mm × 1.6mm TDFN (MT)
May 22, 2014
15
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Package Information(14) and Recommended Land Pattern (2mm × 2mm TDFN-6L)
6-pin 2mm × 2mm TDFN (MT)
May 22, 2014
16
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Package Information(14) and Recommended Land Pattern (2mm × 2mm TDFN-8L)
8-pin 2mm × 2mm TDFN (MT)
May 22, 2014
17
Revision 1.2
Micrel, Inc.
MIC2790/1/3
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical
implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2014 Micrel, Incorporated.
May 22, 2014
18
Revision 1.2
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