MIC2788/MIC2789
Push-Button Reset IC
General Description
The MIC2788/MIC2789 are low-current, ultra-small, push-
button reset supervisors with long set-up delays. The
devices feature two manual reset inputs and two reset
outputs. The devices initiate a reset for the reset timeout
period when the /MR0 and /MR1 inputs are asserted low
for a period longer than the set-up delay. The two manual
reset inputs and long set-up period help to avoid
unintended system resets. Both manual reset inputs can
be tied together if a single push-button reset is desired.
The MIC2788 features integrated pull-up resistors on the
/MR0 and /MR1 inputs, while the MIC2789 requires
external pull-up resistors. The PDY input pin selects
between a 2s, 4s or 6s set-up period. Factory-programmed
reset timeout periods of 140ms (min.) and 240ms (min.)
are available. An active-low, open-drain reset output
(/RST) and an active-high, push-pull reset output (RSTP)
provide
flexibility
when
interfacing
to
various
microcontrollers, PMICs, or load switches.
The MIC2788/MIC2789 consume a quiescent current of
only 2.9µA and are offered in a tiny, space-saving 8-pin
®
thin MLF (2mm x 2mm x 0.55mm) package.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
•
1.6V to 5.5V operating voltage
•
2.9µA supply current when /MR0, /MR1 are not
asserted
•
Asserting /MR0 and /MR1 for longer than set-up delay
asserts reset output for the reset timeout period
•
Programmable delay (PDY) input selects 2.0s, 4.0s or
6.0s set-up delay
•
Factory-programmed 140ms (min.) or 240ms (min.)
reset timeout period
•
Integrated /MR0, /MR1 pull-up resistors (MIC2788)
•
Dual Reset Outputs:
−
Open-drain active-low reset (/RST) output
−
Push-pull active-high reset (RSTP) output
• −40°C
to 85°C ambient operating temperature range
•
8-pin 2mm x 2mm x 0.55mm thin MLF
®
package
Applications
•
•
•
•
•
Smart phones
MP3 players
Portable navigation devices
Set-top boxes (STBs)
Tablets/pads
_________________________________________________________________________________________________________________________
Typical Application
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technologies, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
October 2011
M9999-102711-A
Micrel, Inc.
MIC2788/MIC2789
Ordering Information
(1)
Part Number
MIC2788-XYMT
MIC2788-YYMT
(2)
MIC2789-XYMT
MIC2789-YYMT
(2)
Notes:
1.
2.
3.
4.
All devices available in Tape and Reel only.
Contact factory for availability.
Thin MLF
Thin MLF
®
®
Marking
8XA
8YA
9XA
9YA
Minimum
t
RESET
(ms)
140
240
140
240
Package
(3,4)
Integrated Pull-Up Resistors
Yes
Yes
No
No
8-Pin (2mm
×
2mm) Thin MLF
®
8-Pin (2mm
×
2mm) Thin MLF
®
8-Pin (2mm
×
2mm) Thin MLF
®
8-Pin (2mm
×
2mm) Thin MLF
®
▲
= Pin 1 identifier.
is a Green RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
MIC2788/89
®
8-Pin (2mm
×
2mm) Thin MLF
Top View
Pin Description
Pin Number
1
2
Pin Name
RSTP
GND
Pin Function
Active-High Push-Pull Reset Output. This output changes from low-to-high when both manual
reset pins are pulled low for the setup delay period. RSTP remains high for the reset timeout
delay duration after the setup delay period has elapsed.
Supply Ground.
Active-Low Manual Reset Input. The MIC2788 has an internal 65kΩ pull-up resistor to VIN while
the MIC2789 requires an external pull-up resistor to VIN if used with a push-button. Pull this pin
low to assert and force a reset. Pulling both manual reset inputs low for the setup delay time
causes one reset output pulse for the reset timeout delay period. Connect to VIN if unused, do
not leave floating.
Active-Low Open Drain Reset Output. This output changes from high to low when both manual
reset pins are pulled low for the setup delay period. /RST remains low for the reset timeout delay
after the setup delay has elapsed and it requires an external pull-up resistor.
Programmable Delay Input with Tri-State Connection. When left open, set-up delay is 2s, when
connected to GND, set-up delay is 4s and when connected to VIN, set-up delay is 6s.
3
/MR1
4
5
/RST
PDY
October 2011
2
M9999-102711-A
Micrel, Inc.
MIC2788/MIC2789
Pin Description (Continued)
Pin Number
6
Pin Name
NC
Pin Function
No Connect. Leave pin floating.
Active-Low Manual Reset Input. The MIC2788 has an internal 65kΩ pull-up resistor to VIN while
the MIC2789 requires an external pull-up resistor to VIN if used with a push-button. Pull this pin
low to assert and force a reset. Pulling both manual reset inputs low for the setup delay time
causes one reset output pulse for the reset timeout delay period. If unused, connect to VIN; do
not leave floating.
Positive Supply Voltage. A minimum 0.1μF decoupling ceramic capacitor must be connected
between VIN and GND close to the pins.
Exposed Pad. Connect to GND.
7
/MR0
8
EPAD
VIN
EPAD
October 2011
3
M9999-102711-A
Micrel, Inc.
MIC2788/MIC2789
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .....................................
−0.3V
to
+6.0V
Reset Input Voltage (/MR0, /MR1)........
−0.3V
to V
IN
+ 0.3V
Open Drain Reset Output (/RST) .................
−0.3V
to
+6.0V
Push-Pull Reset Output (RSTP)............
−0.3V
to V
IN
+ 0.3V
Tri-State Programmable Delay (PDY)...
−0.3V
to V
IN
+ 0.3V
Lead Temperature (soldering, 10sec.)....................... 260°C
Junction Temperature (T
J
) ........................−40°C to +150°C
Storage Temperature (Ts).........................
−55°C
to
+150°C
ESD Rating (Human Body Model)
(3)
.............................. 2kV
ESD Rating (Machine Model)
(3)
....................................300V
Operating Ratings
(2)
Supply Voltage (V
IN
)..................................... +1.6V to +5.5V
Reset Input Voltage (/MR0, /MR1)......................... 0V to V
IN
Open Drain Reset Output (/RST)...................... 0V to +5.5V
Push-Pull Reset Output (/RSTP) ........................... 0V to V
IN
Tri-State Programmable Delay (PDY).................... 0V to V
IN
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Junction Thermal Resistance
2mm
×
2mm Thin MLF
®
(θ
JA
).............................90°C/W
Electrical Characteristics
(4)
V
IN
= 3.0V, T
A
= 25°C,
Bold
values indicate –40°C
≤
T
A
≤
+85°C; unless noted otherwise.
Parameter
Power Supply Input
Supply Voltage (V
IN
)
V
IN
= 5V; /MR0, /MR1, /RST, RSTP, and PDY
open
V
IN
= 3V; /MR0, /MR1, /RST, RSTP, and PDY
open
PDY = Open
Set-Up Delay (t
SETUP
)
PDY = 0V
PDY = V
IN
Reset Timeout Delay (t
RESET
)
Reset Outputs (/RST, RSTP)
Reset Output Voltage Low
(/RST Output and RSTP Output)
(V
OL
)
V
IN
=
4.5V, I
SINK
= 3.2mA
V
IN
=
3.3V, I
SINK
= 2.5mA
V
IN
=
1.6V, I
SINK
= 1.0mA
V
IN
=
4.5V, I
SOURCE
= 0.8mA
Reset Output Voltage High
(RSTP Output) (V
OH
)
/RST Output Leakage (I
LO
)
Notes:
1.
2.
3.
4.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
Specification for packaged product only.
Conditions
Min.
Typ.
Max.
Units
V
1.6
3.4
2.9
5.5
7.5
Supply Current (I
IN
)
µA
Reset Time
1.6
3.2
4.8
140
240
2.0
4.0
6.0
220
350
2.4
4.8
7.2
280
480
ms
s
Option X
Option Y
0.3
0.3
0.3
0.8
×
VIN
0.8
×
VIN
0.8
×
VIN
0.3
μA
V
V
V
IN
=
2.7V, I
SOURCE
= 0.5mA
V
IN
=
1.6V, I
SOURCE
= 250μA
V
/RST
= 5.5V
October 2011
4
M9999-102711-A
Micrel, Inc.
MIC2788/MIC2789
Electrical Characteristics
(4)
(Continued)
V
IN
= 3.0V, T
A
= 25°C,
Bold
values indicate –40°C
≤
T
A
≤
+85°C; unless noted otherwise.
Parameter
Manual Reset Inputs (/MR0, /MR1)
Input High Voltage (V
IH
)
Input Low Voltage (V
IL
)
Internal Pull-Up Resistor (R
PU
)
Leakage Current /MR0, /MR1 pin
(I
MR
)
MIC2788 only
/MR0, /MR1 inputs; MIC2789 only
−1.0
65
1.0
1.2
0.3
V
V
kΩ
μA
Conditions
Min.
Typ.
Max.
Units
Programmable Setup Delay Input (PDY)
PDY = V
IN
, /MR0 = /MR1 = 0V
Input Bias Current PDY Pin (I
PDY
)
PDY = V
IN
, /MR0 = V
IN
or /MR1= V
IN
PDY = 0V, /MR0 = /MR1 = 0V
PDY = 0V, /MR0 = V
IN
or /MR1 = V
IN
+60
100
-60
100
μA
nA
μA
nA
October 2011
5
M9999-102711-A
DSP 与 ARM 处理器
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