MIC2777-26BM5 TR Micrel Inc, MIC2777-26BM5 TR Datasheet

IC SUPERVISOR DUAL MCPWR SOT23-5

MIC2777-26BM5 TR

Manufacturer Part Number
MIC2777-26BM5 TR
Description
IC SUPERVISOR DUAL MCPWR SOT23-5
Manufacturer
Micrel Inc
Type
Multi-Voltage Supervisorr
Datasheet

Specifications of MIC2777-26BM5 TR

Number Of Voltages Monitored
2
Output
Complementary
Reset
Active High/Active Low
Reset Timeout
140 ms Minimum
Voltage - Threshold
2.67V, Adj
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
MIC2777-26BM5TR
MIC2777-26BM5TR
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
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
the corresponding reference voltage. They remain asserted
for the timeout period after the input voltage and V
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
IttyBitty™ is a trademark of Micrel, Inc.
November 2005
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
DD
or the input voltage drops below
Ordering Information
Standard
MIC2777-XXBM5 UNXX
V
CORE
V
I/O
1.8V
1.0V
Manual
Reset
DD
against a fixed
R1
R2
Marking Pb-Free
Typical Application
DD
Part Number
VDD
IN
sub-
MIC2777
GND
MIC2777-XXYM5
/RST
RST
1
Features
• Monitors two independent power supplies for under-volt-
• 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
• Generates 140ms (minimum) power-on RESET pulse
• Manual reset capability
• Both active-high and active-low RESET outputs
• Input may be pulled above V
• /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-
• Computer systems
• PDAs, hand-held PCs
• Embedded controllers
• Telecommunications systems
• Power supplies
• Wireless / Cellular systems
• Networking hardware
Dual Micro-Power Low Voltage Supervisor
age conditions
0.3V
ages
MICROPROCESSOR
V
V
/RESET
CORE
I/O
Marking
UNXX
GND
OTHER
LOGIC
MIC2777
Junction Tem. Range
–40ºC to +85ºC
DD
(abs. max.)
SOT-23-5
Package
MIC2777

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MIC2777-26BM5 TR Summary of contents

Page 1

... 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. ...

Page 2

... Contact factory for information on non-standard versions. Available in tape-and-reel only. Pin Configuration Pin Description Pin Number Pin Name 1 /RST 2 GND 3 RST 4 5 VDD MIC2777 Typical Application (V DD 5.0V ±5% 5.0V ±10% 3.3V ±5% 3.3V ±10% 3.0V ±5% 2.85V ±5% 2.70V ±5% 2.5V ±5% 2.4V ±5% 1.8V ±5% ...

Page 3

... Note 4 DD )” as shown in “Standard Voltage Options Table.” (Note 2) ) .................................. +1.5V to +5. .............. –40°C to +85° ....................... 256°C/W JA Min Typ 3.5 V -1. 295 300 – 2.5%), 140 0. 1.2V. DD Max Units µA +1. 305 µs 280 ms 0 MIC2777 ...

Page 4

... Timing Diagram /RST V (ACTIVE LOW RST V (ACTIVE HIGH) OL MIC2777 RST Propagation delays not shown for clarity. Note A. The MIC2777 ignores very brief transients. See “Applications Information” for details HYST HYST V REF t RST November 2005 ...

Page 5

... Typically, the MIC2777 is used to monitor the power supplies of intelligent circuits such as microcontrollers and micropro- cessors. By connecting the appropriate reset output MIC2777 to the reset input of a µC or µP, the processor will be properly reset at power-on and during power-down and will fall below IN brown-out conditions. ...

Page 6

... – R2 TOTAL Application Example Figure 1 illustrates a hypothetical MIC2777-23 application in which the MIC2777-23 is used to monitor the core and I/O supplies of a high-performance CPU or DSP. The core supply this example is 1.0V ±5%. The main power CORE rail and I/O voltage 2.5V ±5%. As shown in Figure 1, ...

Page 7

... The resistor’s value is not critical, however. See Figure 3. The statements above also apply to the MIC2777’s RST out- put. That is, to ensure valid RST signal levels pull-up resistor (as opposed to a pull-down) should be added to the RST output. A value of 100kΩ ...

Page 8

... 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 MIC2777 SOT-23-5 (M5) ...

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