M62021 Ver la hoja de datos (PDF) - Renesas Electronics

Número de pieza

componentes Descripción

Fabricante

M62021

System Reset IC with Switch for Memory Backup

Renesas Electronics 

M62021L/P/FP

Timing Chart

tpd

5V

VIN

0V

VOUT

tpd

VSH

∆VS

VSL

V1

V2

V3

V4

V5

CS

RES

RES

V2

V4

V5

VOL(CS)

5V

VIN(VSL)

VOL(RES)

VOH(RES)

VIN(VSL)

V1 = VIN – VDROP

V2 = VIN – Q4VEB(Di)

V3 = VIN(VSL) – VDROP

VOL(RES)

V4 = VIN(VSL) – Q4VEB(Di)

V5 = VBAT – VF

Figure 6 Timing Chart

Input

Voltage

Output

Pin

VOUT

RES

RES

CS

In Normal Operation

Input voltage: 5V

With Q4 set to ON,

a voltage (VIN – VDROP)

is output

The output level is VOL

(RES) with a logic low

The output level is VOH

(RES) with a logic low

The output level is VOL

(CS) with a logic low

In Failure (Instantaneous

Drop)

Input voltage: 5V→4V

Each output varies if the input

voltage drops to VSL or under

Q4 is turned OFF. A voltage

(VIN – Q4VEB(Di)) is output by

the diode between E and B of

Q4.

As the state shifts from a logic

low to logic high, the output

level becomes approximately

equal to the input voltage.

As the state shifts from a logic

high to logic low, the output

level becomes VOL (RES).

As the state shifts from a logic

low to logic high, the output

level becomes the voltage VIN –

Q4VEB(Di).

Restoration from Failure

(Instantaneous Drop)

Input voltage: 4V→5V

If the input voltage goes higher

than VSL by 100mV, each

output varies after delay

produced by the delay circuit

Q4 is turned ON after delay

and a voltage (VIN – VDROP) is

output.

A logic high is maintained, and

than shifts to a logic high.

A logic low is held, and than

shifts to a logic high.

A logic high is maintained, and

than shifts to a logic high.

In Backup State

Input voltage: 0V

Backup voltage: 3V

VBAT – VF

—

—

The output is a logic

high and the output

level is VBAT – VF

REJ03D0784-0200 Rev.2.00 Jun 15, 2007

Page 8 of 13

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