MIC2772 datasheet(7/9 Pages) MICREL

7 / 9 page

Micrel

MIC2772

Transients on VCC

The MIC2772 is inherently immune to very short

“glitches” on VCC.

In the case of very brief

transients, VCC may drop below the reset-voltage

threshold without triggering a reset. As shown in the

graph,

the

MIC2772

relatively

immune

transients with typical duration of 25us. The lines on

the graph represent the typical allowable transient

duration for a given amount of threshold overdrive

that will not generate a reset. The data was taken by

adding negative-going square-wave pulse to a DC

input voltage set at 0.5V above actual measured

threshold for the part being characterized. Figure 1

shows the graph for the MIC2772[UP3] and Figure 2

shows the graph for the MIC2772[UP5]

200

400

600

800

1000

RESET COMP. OVERDRIVE VTH - VCC (mV)

Typical Transient

Response

= 4.393V

Figure 1

200

400

600

800

1000

RESET COMP. OVERDRIVE VTH - VCC (mV)

Typical Transient

Response

= 2.933V

Figure 2

Interfacing to Processors with Bi-directional

Reset Pins

Some microprocessors have reset signal pins that

are bi-directional, rather than input only. The

Motorola 68HC11 family is one example. Because

the MIC2772’s output is active-low, open-drain, it

can be connected directly to the processor’s reset

pin with only the pull-up resistor normally required.

MIC2772 Replaces Single Supervisor

The table below lists common single voltage

supervisors that can be considered for replacement

by MIC2772.

P/N Suffix

Supervisor #1

Supervisor #2

L2L3

MIC6315-46D2

MIC1810-5,

MIC6315-46D3,

MIC809L, MIC811L

M2M3

MIC6315-44D2

MIC1810-10,

MIC6315-44D3,

MIC809M,

MIC811M

L3L3

MIC1810-5,

MIC6315-46D3,

MIC809L, MIC811L

MIC1810-5,

MIC6315-46D3,

MIC809L, MIC811L

M3M3

MIC1810-10,

MIC6315-44D3,

MIC809M,

MIC811M

MIC1810-10,

MIC6315-44D3,

MIC809M,

MIC811M

T3T3

MIC6315-31D3,

MIC809T, MIC811T

MIC6315-31D3,

MIC809T, MIC811T

S3S3

MIC1815-10,

MIC6315-29D3,

MIC809S, MIC811S

MIC1815-10,

MIC6315-29D3,

MIC809S, MIC811S

T2T3

MIC6315-31D2

MIC6315-31D3,

MIC809T, MIC811T

S2S3

MIC6315-29D2

MIC1815-10,

MIC6315-29D3,

MIC809S, MIC811S

L3T3

MIC1810-5,

MIC6315-46D3,

MIC809L, MIC811L

MIC6315-31D3,

MIC809T, MIC811T

M3S3

MIC1810-10,

MIC6315-44D3,

MIC809M,

MIC811M

MIC1815-10,

MIC6315-29D3,

MIC809S, MIC811S

April 2005

M9999-042605

(408) 955-1690

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