MIC2794
Supervisor with Fast Propagation Delay and
Capacitor-Programmable
Reset Delay
General Description
The MIC2794 is a low-current supervisor with capacitor-
programmable reset delay time. It provides an active-low
manual reset input and active-low open-drain, active-low
push-pull, or active-high push-pull outputs. The device
initiates a reset signal when the sense input drops below
the threshold voltage (between 0.4V and 4.6V), or the
manual input is asserted low. The active-low reset stays
low for the duration of the reset timeout delay once the
monitored voltage or the manual reset exceed their
thresholds. The reset timeout delay period is
programmable from 1.25ms to 10s with an external
capacitor.
The MIC2794 operates from a supply voltage of 1.65V to
5.5V and guarantees an active-low reset output for supply
voltages equal to or greater than 1V. The device is rated to
operate over the temperature range of
−40°C
to +125°C.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
1.65V to 5.5V operating supply voltage range
Ultra-low operating current: 2µA (typical)
Fast propagation delay: 20µs (typical)
Fixed threshold voltages and 0.4V reference voltage
(adjustable from 0.4V to 4.6)
−
±2.0% threshold accuracy from –40°C to +125°C
Programmable reset timeout delay (from 1.25ms to 10s)
Manual reset input with an internal pull-up resistor
Active-low/high 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
6-pin 1.6mm × 1.6mm Thin DFN
•
•
•
•
•
•
Applications
•
Microprocessor systems
•
Computers, tablets
•
Intelligent instruments
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
January 29, 2015
Revision 1.0
Micrel, Inc.
MIC2794
Ordering Information
Part Number
(1,
2, 3)
Marking
Code
QP
QO
QN
QQ
QR
QU
QV
QX
QZ
BQ
QC
QB
QA
QD
QE
QG
QH
QJ
QL
QM
Typical
Threshold
Voltage (V
TH
)
0.400V
0.400V
0.400V
0.840V
1.120V
1.400V
1.670V
2.330V
3.070V
4.650V
0.400V
0.400V
0.400V
0.840V
1.120V
1.400V
1.670V
2.330V
3.070V
4.650V
/RESET
Output
(Active-Low)
−
Push-Pull
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
−
Push-Pull
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
RESET
Output
(Active-
High)
Push-Pull
−
−
−
−
−
−
−
−
−
Push-Pull
−
−
−
−
−
−
−
−
−
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
–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
–40°C to +125°C
–40°C to +125°C
Package
MIC2794H-04VD6
MIC2794L-04VD6
MIC2794N-04VD6
MIC2794N-08VD6
MIC2794N-11VD6
MIC2794N-14VD6
MIC2794N-16VD6
MIC2794N-23VD6
MIC2794N-30VD6
MIC2794N-46VD6
MIC2794H-04VMT
MIC2794L-04VMT
MIC2794N-04VMT
MIC2794N-08VMT
MIC2794N-11VMT
MIC2794N-14VMT
MIC2794N-16VMT
MIC2794N-23VMT
MIC2794N-30VMT
MIC2794N-46VMT
Note:
6-pin TSOT
6-pin TSOT
6-pin TSOT
6-pin TSOT
6-pin TSOT
6-pin TSOT
6-pin TSOT
6-pin TSOT
6-pin TSOT
6-pin TSOT
6-pin 1.6mm × 1.6mm TDFN
6-pin 1.6mm × 1.6mm TDFN
6-pin 1.6mm × 1.6mm TDFN
6-pin 1.6mm × 1.6mm TDFN
6-pin 1.6mm × 1.6mm TDFN
6-pin 1.6mm × 1.6mm TDFN
6-pin 1.6mm × 1.6mm TDFN
6-pin 1.6mm × 1.6mm TDFN
6-pin 1.6mm × 1.6mm TDFN
6-pin 1.6mm × 1.6mm TDFN
1. Other options are available. Contact Micrel for details.
2. All devices are available in Tape & Reel only. (Order entry PN, add TR. Example: MIC2794H-04VD6 TR).
3. Standard/Full reel quantity:
a.
b.
6-pin TSOT: 3,000 pieces per reel, Reel diameter is 7 inches, Hub diameter is 2 inches, Width is 8mm.
6-pin TDFN: 5,000 pieces per reel, Reel diameter is 13 inches, Hub diameter is 7 inches, Width is 8mm.
Part Numbering Convention
January 29, 2015
2
Revision 1.0
Micrel, Inc.
MIC2794
Pin Configuration
6-Pin TSOT (D6)
(Top View)
6-Pin 1.6mm × 1.6mm TDFN (MT)
(Top View)
Pin Description
Pin
Number
TSOT-6
Pin
Number
TDFN
Pin
Name
Pin Function
/RESET is an active-low output pin and is available in an open-drain or push-pull
configuration.
The /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.
In the open-drain configuration, an external pull-up resistor to VDD is required, the push-
pull configuration does not require a pull-up resistor.
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.
Programmable timeout delay. Connect a capacitor (up to 1.5µF) to ground to set a user
defined reset delay time. Leave this pin unconnected for a reset delay time of 20ms.
Connect to VDD via a resistor (40kΩ to 200kΩ) to set a reset delay time of 320ms.
Manual reset is an active-low logic pin and internally pulled to VDD through a 109kΩ pull-
up resistor. Pulling the /MR input to a logic low asserts /RESET. /RESET will remain low for
the reset timeout delay after /MR is pulled to logic high.
Connect-sense pin to the voltage to be monitored or through a resistor divider. When this
voltage decreases below the threshold voltage, V
TH
, /RESET is asserted low.
Supply voltage pin. Bypass this pin to GND with a 1µF capacitor placed as close to the pin
as possible.
Exposed Pad. Connect to ground plane.
1
6
/RESET
1
2
3
6
5
4
RESET
GND
CTH
4
3
/MR
5
6
−
2
1
EP
SNS
VDD
EP
January 29, 2015
3
Revision 1.0
Micrel, Inc.
MIC2794
Absolute Maximum Ratings
(4)
Supply Voltage (V
DD
) ....................................
−0.3V
to +6.0V
SNS, /MR, C
TH
..................................................
−0.3V
to V
DD
/RESET (open drain) ........................................ -0.3V to +6V
/RESET, RESET (push-pull) .................
−0.3V
to V
DD
+0.3V
Lead Temperature (soldering, 10s) ............................ 260°C
Storage Temperature (T
S
) .........................
−55°C
to +150°C
ESD Rating (Human Body Model)
(6)
.............................. 2kV
ESD Rating (Machine Model)
(
6)
................................... 200V
Operating Ratings
(5)
Supply Voltage (V
DD
) .................................... +1.0V to +5.5V
SNS, /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
TSOT-6 (θ
JA
) ................................................. 177.2°C/W
1.6mm × 1.6mm TDFN-6 (θ
JA
) ........................ 92.4°C/W
Electrical Characteristics
(7)
V
DD
= 1.65V to 5.5V; R
L
= 100kΩ; C
L
= 50pF; T
A
= 25°C,
bold
values indicate
−40°C
≤ T
A
≤ +125°C, unless noted.
Parameter
Supply Voltage (V
DD
)
Power-up Reset Voltage (V
DDmin
)
Condition
/RESET output valid
Output guaranteed in defined state
V
DD
= 3.3V,
C
T
, /MR = open
/RESET and RESET not asserted
V
DD
= 5V,
C
T
, /MR = open
/RESET and RESET not asserted
V
TH
= 0.400V
Sense Threshold Voltage Accuracy
(V
TH
)
Sense Hysteresis Voltage (V
HYST
)
Sense Input Bias Current
Sense Pulse Width to Reset
0.8V < V
TH
< 3.3V
3.3V < V
TH
< 5.5V
Sense rising
V
SNS
= 0.400V
V
SNS
= 5.5V
V
SNS
= 1.05 * V
TH
→ 0.95 * V
TH
−25
1.5
20
−2.0
−1.5
−2.0
2
Min.
1.65
Typ.
Max.
5.5
1.0
5
µA
2.5
±1.0
±0.5
±1.0
6
+2.0
+1.5
+2.0
+2.5
+25
%
nA
µA
µs
%
Units
V
V
Supply Current (I
DD
)
±
1.5
/RESET & RESET Output Specifications
SNS to /RESET and or RESET
(8)
Propagation Delay
1V ≤ V
DD
< 1.3V, I
OL
= 15µA
/RESET, RESET Logic Low Output
Voltage
1.3V ≤ V
DD
< 1.8V, I
OL
= 0.4mA
1.8V ≤ V
DD
< 5.5V, I
OL
= 1mA
1V ≤ V
DD
< 1.1V, I
OH
= 1µA
Push-Pull /RESET, RESET Logic High
Output Voltage
1.1V ≤ V
DD
< 1.3V, I
OH
= 15µA
1.3V ≤ V
DD
< 1.8V, I
OH
= 0.4mA
1.8V ≤ V
DD
< 5.5V, I
OH
= 1mA
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 assertion.
20
0.3
0.3
0.4
µs
V
0.8*V
DD
V
January 29, 2015
4
Revision 1.0
Micrel, Inc.
MIC2794
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.
Parameter
Open Drain /RESET Leakage Current
Condition
V
/RESET
= 5.5V, not asserted
C
TH
= open
RESET Delay Time
C
TH
= V
DD
C
TH
= 100pF
C
TH
= 180nF
/MR Input Specifications
/MR Internal Pull-Up Resistance
/MR to /RESET and RESET
Propagation Delay
/MR Pulse Width to Reset
/MR Logic Low Input Voltage
/MR Logic High Input Voltage
0.75*V
DD
1
0.25*V
DD
70
109
150
kΩ
ns
µs
V
V
12
180
0.75
700
14
240
1.25
1200
Min.
Typ.
Max.
500
28
400
1.75
1700
ms
Units
nA
January 29, 2015
5
Revision 1.0
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