MIC2790/1/3
Supervisor with High-Accuracy,
Ultra-Fast Propagation Delay, and
Capacitor-Programmable Reset Delay
General Description
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.
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.
Features
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)
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
Part Number
Marking
Code
9NB
9LB
9LC
9NA
1N
1L
XH
3LH
3NH
Threshold
Voltage
(1)
(SNS)
0.4V
0.4V
0.4V
0.4V
0.4V
0.4V
0.4V
0.4V
0.4V
/RESET
Output
(Active-
Low)
Open-Drain
Push-Pull
Open-Drain
Open-Drain
Push-Pull
Push-Pull
Open-Drain
RESET
Output
(Active-
High)
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Enable
Pin
Feature
Yes
Yes
Junction
Temperature
Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
(2,
3)
MIC2790N-04VD6
MIC2790L-04VD6
MIC2790H-04VD6
MIC2790N-04VMT
MIC2791N-04VMT
MIC2791L-04VMT
MIC2791H-04VMT
MIC2793LH-04VMT
MIC2793NH-04VMT
Notes:
6-pin TSOT-23
6-pin TSOT-23
6-pin TSOT-23
6-pin 2mm × 2mm TDFN
6-pin 1.6mm ×1.6mm TDFN
6-pin 1.6mm × 1.6mm TDFN
6-pin 1.6mm ×1.6mm TDFN
8-pin 2mm × 2mm TDFN
8-pin 2mm × 2mm TDFN
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)
GND
/MR
1
2
3
6
5
4
VDD
SNS
C
TH
VDD
SNS
C
TH
1
2
3
6
5
4
RESET (/RESET)
GND
/MR
EP
6-Pin TSOT (D6)
(Top View)
6-Pin 1.6mm x 1.6mm TDFN (MT)
(Top View)
VDD
SNS
C
TH
1
2
3
6
5
4
RESET (/RESET)
GND
EN
VDD
SNS
1
2
3
4
EP
8
7
6
5
RESET
/RESET
GND
/MR
EP
/MR
C
TH
6-Pin 2mm x 2mm TDFN (MT)
(Top View)
8-Pin 2mm x 2mm TDFN (MT)
(Top View)
May 22, 2014
2
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Pin Description
Pin
Number
TSOT-23
(6L)
Pin
Number
1.6 × 1.6
(6L)
Pin
Number
2×2
(6L)
Pin
Number
2×2
(8L)
Pin
Name
Pin Function
1
6
6
7
/RESET
/RESET is an active-low output pin and is available in an open-
drain 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 > (V
TH
+ V
HYST
) 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 > (V
TH
+ V
HYST
) and /MR is set to a logic high.
Supply Ground.
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.
Programmable timeout delay. Connect a capacitor to ground to set
a user defined reset delay time.
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.
Supply voltage pin. Bypass with a 1µF capacitor from this pin to
GND.
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 de-
asserted. The EN pin has an internal 90kΩ pull-up resistor to VDD.
Exposed Pad. Connect to ground plane.
1
6
6
8
RESET
2
5
5
6
GND
3
4
4
5
/MR
4
3
3
4
CTH
5
2
2
3
SNS
6
1
1
2
VDD
EP
EP
1
EN
EP
ePad
May 22, 2014
3
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Absolute Maximum Ratings
(4)
Supply Voltage (V
DD
) ....................................
0.3V
to +6.0V
SNS ................................................................
0.3V
to 4.5V
/MR, EN, C
TH
....................................................
0.3V
to V
DD
RESET, /RESET ..............................................
0.3V
to V
DD
Lead Temperature (soldering, 10s) ............................ 260°C
Storage Temperature (T
S
) .........................
55°C
to +150°C
(6)
ESD Ratings ............................................... ESD Sensitive
Operating Ratings
(5)
Supply Voltage (V
DD
) .................................... +1.5V to +5.5V
SNS ..................................................................... 0V to 4.0V
/MR, EN, C
TH
......................................................... 0V to V
DD
RESET, /RESET ................................................... 0V to V
DD
Junction Temperature (T
J
) ........................
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)
V
DD
= 3.3V; R
/RESET
= 100kΩ; C
TH
= 1nF; T
A
= 25°C,
bold
values indicate
40°C
≤ T
A
≤ +125°C, unless noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
Supply Specifications
V
DD
Supply Voltage
/RESET Output Valid
V
DD
= EN = /MR = 3.3V
RESET and /RESET not asserted
V
DD
= EN = /MR = 5V
RESET and /RESET not asserted
1.5
40
50
5.5
70
µA
80
V
I
DD
Supply Current
Sense Specifications
V
TH
V
HYST
I
SNS
Sense Threshold Voltage
Sense Threshold Accuracy
Hysteresis
Sense Input Bias Current
Sense rising
1.0
2.5
15
0.4
+1.0
V
%
%
nA
1.5
+2.5
+15
RESET & /RESET Output Specifications
t
p,SNS
V
OL
V
OH
I
OH
t
d
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 V
TH
× 1.05 to V
TH
× 0.95 to RESET and or
/RESET.
SNS to RESET and /RESET
(8)
Propagation Delay
/RESET Logic Low Output
Voltage
RESET Logic High Output
Voltage
/RESET Leakage Current
RESET and /RESET
Timeout Delay
SNS = V
TH
× 1.05 to V
TH
× 0.95
I
OL
= 1mA (open-drain only)
I
OH
≤ 1mA (push-pull only)
/RESET not asserted (open-drain only)
C
TH
= 100pF
C
TH
= 180nF
0.45
0.5
>0.9 × V
DD
1
2.2
0.3
µs
V
V
1
1.05
1.2
1.8
1.9
µA
ms
s
May 22, 2014
4
Revision 1.2
Micrel, Inc.
MIC2790/1/3
Electrical Characteristics
(7)
(Continued)
V
DD
= 3.3V; R
/RESET
= 100kΩ; C
TH
= 1nF; T
A
= 25°C,
bold
values indicate
40°C
≤ T
A
≤ +125°C, unless noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
/MR Input Specifications
R
/MR
t
p,/MR
V
IL
V
IH
/MR Internal Pull-Up
Resistance
/MR to RESET and /RESET
Propagation Delay
/MR Logic Low Input Voltage
/MR Logic High Input
Voltage
1.2
90
100
0.5
kΩ
ns
V
V
EN Input Specifications (MIC2793 only)
R
EN
t
p,EN
V
ENL
V
ENH
EN Internal Pull-Up
Resistance
EN to RESET and /RESET
Propagation Delay
EN Logic Low Input Voltage
EN Logic High Input Voltage
1.2
/MR = logic low
90
100
0.5
kΩ
ns
V
V
May 22, 2014
5
Revision 1.2
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