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MIC2777-22YM5-TR

P1-P3P4-P6P7-P8
November 2005 1 MIC2777
MIC2777 Micrel, Inc.
MIC2777
Dual Micro-Power Low Voltage Supervisor
General Description
The MIC2777 is a dual power supply supervisor that provides
under-voltage monitoring, manual reset capability, and power-
on reset generation in a compact 5-pin SOT package. Fea-
tures include two under-voltage detectors, one fixed and one
adjustable, and both active-high and active-low reset outputs.
One under-voltage detector compares V
DD
against a fixed
threshold. Ten factory-programmed thresholds are available.
The other under-voltage detector is user-adjustable.
The reset outputs are asserted for no less than 140ms at
power-on and any time V
DD
or the input voltage drops below
the corresponding reference voltage. They remain asserted
for the timeout period after the input voltage and V
DD
sub-
sequently rise back above the threshold boundaries. A reset
can be generated at any time by pulling down on the adjust-
able input. Hysteresis is included to prevent chattering due
to noise. Typical supply current is a low 3.5µA.
Typical Application
IN
R1
R2
/RST
VDD
RST
OTHER
LOGIC
MIC2777
MICROPROCESSOR
Manual
Reset
/RESET
V
CORE
V
CORE
1.0V
V
I/O
1.8V
V
I/O
GND
GND
Typical Application
Features
• Monitors two independent power supplies for under-volt-
age conditions
• One fixed and one user adjustable input
• 1.5% theshold accuracy
• Choice of factory-programmed thresholds
• User-adjustable input can monitor supplies as low as
0.3V
• Generates 140ms (minimum) power-on RESET pulse
• Manual reset capability
• Both active-high and active-low RESET outputs
• Input may be pulled above V
DD
(abs. max.)
• /RST output valid down to 1.2V
• Ultra-low supply current, 3.5µA typical
• Rejects brief input transients
• IttyBitty™ 5-pin SOT-23 package
Applications
• Monitoring processor, ASIC, or FPGA core and I/O volt-
ages
• Computer systems
• PDAs, hand-held PCs
• Embedded controllers
• Telecommunications systems
• Power supplies
• Wireless / Cellular systems
• Networking hardware
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
IttyBitty™ is a trademark of Micrel, Inc.
Ordering Information
Part Number
Junction Tem. Range
Package
Standard Marking Pb-Free Marking
MIC2777-XXBM5 UNXX MIC2777-XXYM5 UNXX –40ºC to +85ºC SOT-23-5
MIC2777 Micrel, Inc.
MIC2777 2 November 2005
Pin Configuration
/RST
VDDIN
RST
13
4 5
2
GND
SOT-23-5 (M5)
Standard Voltage Options*
Voltage Typical Nominal Threshold
Code Application (V
DD
) Voltage (V
TH
)
46 5.0V ±5% 4.68
44 5.0V ±10% 4.43
31 3.3V ±5% 3.09
29 3.3V ±10% 2.93
28 3.0V ±5% 2.81
26 2.85V ±5% 2.67
25 2.70V ±5% 2.53
23 2.5V ±5% 2.34
22 2.4V ±5% 2.25
17 1.8V ±5% 1.69
*There are ten standard versions available with an order increment of 3000 pieces. Samples of standard versions are
normally available from stock. Contact factory for information on non-standard versions. Available in tape-and-reel only.
Pin Description
Pin Number Pin Name Pin Function
1 /RST
Digital (Output): Asserted low whenever V
IN
or V
DD
falls below the reference
voltage. It will remain asserted for no less than 140ms after V
IN
and V
DD
return above the threshold limits.
2 GND Ground
3 RST
Digital (Output): Asserted high whenever V
IN
or V
DD
falls below the refer-
ence voltage. It will remain asserted for no less than 140ms after V
IN
and
V
DD
return within above the threshold limit.
4 IN Analog (Input): The voltage on this pin is compared to the internal 300mV
reference. An undervoltage condition will trigger a reset sequence. Manual
reset capability can be achieved by adding a switch between this pin and
ground.
5 VDD Analog (Input): Power supply input for internal circuitry and input to the fixed
voltage monitor: The voltage on this pin is compared against the internal
voltage reference. An undervoltage condition will trigger a reset sequence.
November 2005 3 MIC2777
MIC2777 Micrel, Inc.
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
DD
) .......................................–0.3V to +7V
Input Voltage (V
IN
) ...........................................–0.3V to +7V
RST, (/RST) Current ...................................................
20mA
Storage Temperature (T
S
) ........................ –65°C to +150°C
ESD Rating, Note 3 .................................................... 1.5kV
Operating Ratings (Note 2)
Supply Voltage (V
DD
) .................................. +1.5V to +5.5V
Input Voltage
(V
IN
) .............................................................–0.3V to +6.0V
Ambient Temperature Range (T
A
) .............. –40°C to +85°C
Package Thermal Resistance (
θ
JA
) ....................... 256°C/W
Electrical Characteristics
Note 5; T
A
= +25°C, bold values indicate –40°C ≤ T
A
≤ +85°C; unless noted
Symbol Parameter Condition Min Typ Max Units
I
DD
Supply Current V
DD
= V
IN
3.5
µA
Note 5; /MR, RST, /RST open
VDD VOLTAGE THRESHOLD
Under-Voltage Threshold On V
DD
V
TH
-1.5%
V
TH
V
TH
+1.5%
V
V
HYST
Hysteresis Voltage 1 %
IN, UNDER-VOLTAGE DECTECTOR INPUT
V
REF
Under-Voltage Threshold 295 300 305 mV
V
HYST
Hysteresis Voltage 3 mV
I
IN
Input Current 5 pA
T
MIN
≤ T
A
≤ T
MAX
10 nA
RST, /RST OUTPUTS
t
PROP
Propagation Delay V
IN
= (V
REF(MAX)
+ 100mV) to 20 µs
V
IN
= (V
REF(MIN)
– 100mV) or
V
DD
= (V
TH
+ 2.5
%
) to (V
TH
– 2.5
%
), V
IN
=V
DD
t
RST
Reset Pulse Width 140 280 ms
V
OL
RST or /RST Output Voltage Low I
SINK
= 1.6mA; 0.3
V
V
DD
≥ 1.6V
I
SINK
= 100µA; 0.3
V
V
DD
≥ 1.2V,
Note 4
V
OH
RST or /RST Output Voltage High I
SOURCE
= 500µA; 0.8V
DD
V
V
DD
≥ 1.5V
RST asserted, I
SOURCE
= 10µA; 0.8V
DD
V
V
DD
≥ 1.2V,
Note 4
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 4. V
DD
operating range is 1.5V to 5.5V. Output is guaranteed to be asserted down to V
DD
= 1.2V.
Note 5. V
DD
equals the nominal “Typical Application (V
DD
)” as shown in “Standard Voltage Options Table.”
P1-P3P4-P6P7-P8

MIC2777-22YM5-TR

Mfr. #:
Buy MIC2777-22YM5-TR
Manufacturer:
Microchip Technology / Micrel
Description:
Supervisory Circuits Dual Voltage Supervisor with 0.3V and 2.25V Thresholds, Active-High and Active-L
Lifecycle:
New from this manufacturer.
Delivery:
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