MIC2779 datasheet(3/6 Pages) MICREL

3 / 6 page

January 2006

MIC2779

Micrel, Inc.

Absolute Maximum Ratings (Note 1)

Supply Voltage (VDD).......................................–0.3V to +7V

Input Voltages (VLTH, VHTH, V/RST, VRST)........–0.3V to +7V

/RST, RST Output Current (I/RST), (IRST).................... 20mA

Storage Temperature (TS) ........................ –65°C to +150°C

ESD Rating,

Note 3....................................................... 2kV

Operating Ratings (Note 2)

Supply Voltage (VDD) .................................. +1.5V to +5.5V

Input Voltages (VLTH, VHTH, V/RST, VRST).....–0.3V to +6.0V

Ambient Temperature Range (TA) .............. –40°C to +85°C

Package Thermal Resistance................................ 256°C/W

Electrical Characteristics

1.5V ≤ VDD ≤ 5.5V; TA = +25°C, bold values indicate –40°C ≤ TA ≤ +85°C; unless noted

Symbol

Parameter

Condition

Min

Typ

Max

Units

IDD

Supply Current

/RST, RST not asserted

µA

ILTH, IHTH

Input Leakage Current

VREF

Reference Voltage

1.240

MIC2779H/L-2

1.215

1.265

MIC2779H/L-1

1.228

1.252

Propagation Delay

VLTH = VREF(max) +100mV to

µs

VREF(min) – 100mV

tRESET

Reset Pulse Width

140

420

VOL

Reset Output Low Voltage

/RST asserted or RST not asserted,

ISINK = 1.6mA, VDD ≥ 1.6V

0.3

/RST asserted or RST not asserted,

ISINK = 100µA, VDD ≥ 1.2V,

0.4

VOH

Reset Output High Voltage

/RST not asserted or RST asserted,

ISOURCE = 500µA, VDD ≥ 1.6V

0.8VDD

/RST not asserted or RST asserted,

ISOURCE = 50µA, VDD ≥ 1.2V,

0.8VDD

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. VDD operating range is 1.5V to 5.5V. Output is guaranteed to be held low down to VDD = 1.2V.

Timing Diagram

VHTH

VBATT

VLTH

VOH

VOL

tRST

V/RST

VOH

VOL

VRST

Propagation delays not shown for clarity.

Note A. The MIC2779 ignores very brief transients.

See “Applications Information” for details.

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