Datasheet MM1081XV, MM1027NV, MM1027XD, MM1027XF, MM1027XV Datasheet (MITSMI)

MITSUMI

System Reset (with battery back-up) MM1027, 1081

System Reset (with battery back-up)

Monolithic IC MM1027, 1081

Outline

These ICs were developed for STATIC-RAM (S-RAM) battery back-up, and have built-in switching circuit for
main power supply and battery, back-up timing circuit and battery checker.
Power ON/OFF and momentary power interruptions can damage S-RAM data on equipment that contains an
S-RAM. These ICs switch the S-RAM to back-up mode (CS signal makes S-RAM CE pin low and CE
when power supply voltage goes below a set voltage (detection voltage 4.2V typ., variable), preventing
damage to data. Further, when power supply voltage drops, these ICs switch from main power supply to
battery back-up (switching voltage 3.3V typ.). Then, when power supply voltage rises, they first switch the S­RAM from battery back-up state to main power supply (switching voltage 3.3V typ.), and from back-up mode
to normal mode (CS signal makes S-RAM CE pin high and CE

--------------------------------------------------

pin low). These signal processes provide
reliable protection against data damage. The CS signal also can absorb power supply chattering and
roughness through the external capacitor.
There is a built-in battery checker to monitor the back-up battery voltage, and this circuit is turned ON/OFF by
the control pin.

---------------------------------------------------

pin high)

Features

1. Battery back-up

1. Low IC current consumption (loss current) 0.3µA typ.

2. Drop voltage inside IC (input/output voltage difference) I

3. Reverse current (reverse leak current) 0.1µA max.

2. Normal operation

MM1027

Drop voltage inside IC (input/output voltage difference) I
Output voltage V

CC=5V IO=10mA 4.8V typ.

Current consumption D.CONT OPEN 3.0mA max.
External transistor drive current 25mA typ.

MM1081

Drop voltage inside IC (input/output voltage difference) I
Output voltage V

CC=5V IO=120mA 4.75V typ.

Current consumption 350µA max.
External transistor drive current (for output current increase) 25mA typ.
TC source current 3.0µA typ.

3. Battery-Vcc switching voltage 3.3V typ.

4. Detection voltage (CS, CS

------------------------------------------------

) variable 4.2V typ.

5. Battery checker 1 X type 2.70V typ.

N type 2.50V typ.

6. Battery checker 2 X type 2.55V typ.

N type 2.35V typ.

O=10µA 0.2V typ.

O=70mA 0.2V typ.

O=120mA 0.25V typ.

Package

TSOP-20A (MM1027XV, MM1027NV, MM1081XV)
SOP-16A (MM1027XF, MM1027NF)
DIP-16A (MM1027XD)

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SOP-16A/DIP-16A

13 762458

16 13 1115 14 12910

TSOP-20A

13 6824579

10

20 16 1319 17 15 14 1218 11

System Reset (with battery back-up) MM1027, 1081

Applications

1. IC memory cards (RAM cards)

2. PCs, word processors

3. Fax machines, photocopiers, other office equipment

4. Other equipment with S-RAMs (equipment requiring back-up)

Pin Assignment

Pin no.

Function

TSOP-20A SOP-16A DIP-16A

1 GND GND GND
2 ADJ. NC NC
3 NC ADJ. ADJ.
4 TC TC T

C

5 NC CS CS
6 CS NC NC
7 NC CS

---------------------------------------------------

8 CS

---------------------------------------------------

DET.CONT DET.CONT

---------------------------------------------------

CS

9 NC Bat.DET1 Bat.DET1
10 DET.CONT NC NC
11 Bat.DET1 Bat.DET2 Bat.DET2
12 NC Battery Battery
13 Bat.DET2 V

OUT VOUT

14 NC External drive External drive
15 Battery NC NC
16 NC V

CC VCC

17 VOUT
18 NC
19 External drive
20 V

CC

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Block Diagram

System Reset (with battery back-up) MM1027, 1081

Absolute Maximum Ratings

Item Symbol Rating Units

Storage temperature T

Operating temperature T

Power supply voltage V

Operating voltage V

Allowable loss Pd 300 mW

Output current

Output current I

Note : IO1 expresses VCC output current value, and IO2 expresses VBATT output current value.

Electrical Characteristics

Item Symbol Measurement conditions Min. Typ. Max. Units

Consumption MM1027
current 1

All

circuits

Consumption
current 2

MM1027 I
MM1081 I

(Except where noted otherwise, Ta=25°C, VCC=5V, V

MM1081 V

MM1027 I

(Ta=25°C)

STG

OPR

CC max. 7 V

CCOP 7V

O190mA
O1 120 mA
O2 200 µA

V

CC=5V, VBAT=3V, IO=0mA

I

CC1 D.CONT pin : OPEN

CC=5V, VBAT=3V, IO=0mA 150 210 350 µA

V

CC2

CC=5V, VBAT=3V, IO=0mA

-

40~+125

-

20~+70

D.CONT pin : GND

°

C

°

C

BAT

=3V)

0.9 1.7 3.0 mA

1.2 2.2 3.5 mA

---------------------------------

CS•CS

circuit

unit

CS, CS detection voltage 1 V
CS, CS hysteresis voltage 1
Detection voltage
temperature characteristic

MM1027
MM1081

S/ T

V

CS, CS detection voltage 2

CS, CS hysteresis voltage 2
CS output voltage L V
CS output voltage H V
CS source current I

S1VCC=H L, VBAT=3V, ADJ pin : OPEN 4.05 4.20 4.35 V

VS1VCC=L H 0.05 0.10 0.20 V

±0.08

%/°C

±0.06

VS2

CC=H L, VBAT=3V

ADJ pin : 12kΩ PULL UP (to V

CC)

3.25 3.50 3.75 V

V

VS2VCC=L H 0.05 0.10 0.20 V

CSL VCC=3V, ICS=3µA 0.05 0.10 V
CSH VCC=5V, ICS=

CSH VCC=5V, VCS=4.6V current measured 8 15 µA

-

3µA 4.85 4.95 V

MITSUMI

System Reset (with battery back-up) MM1027, 1081

Electrical Characteristics

Item Symbol Measurement conditions Min. Typ. Max. Units

CS sync current I

-----------------------------------------------------

CS

output voltage L VCC=5V, ICS=3µA

-----------------------------------------------------

CS

output voltage H VCC=4V, VOUT-VCSH, ICS=-3µA

-----------------------------------------------------

CS

-----------------------------------------------------

•

CS

CS
circuit
unit

BD

circuit

unit

sync current VCC=5V, VCS=0.4V Current measured 0.3 1.0

Operation limit voltage L V

ON delay time 1 t
OFF delay time 1 t
ON delay time 2 t
OFF delay time 2 t
BATT
detection voltage 1

MM1027X
MM1081N

BATT hysteresis voltage 1

BATT

detection voltage 2

MM1027X
MM1081N

BATT hysteresis voltage 2

BD output voltage L VBDL V

(Except where noted otherwise, Ta=25°C, VCC=5V, V

CSL VCC=3.5, VCS=0.4V Current measured 0.5 2.0

--------------------------------------------------------------------

VCSL

--------------------------------------------------

VCSH

---------------------------------------------------------------

ICSL

Minimum power supply voltage at which

OPL

CS pin can hold low level V

PLH1VCC=L H, TC : OPEN, C1=47pF
PHL1VCC=H L, TC : OPEN, C1=47pF
PLH2VCC=L H, TC : 1nF, C1=47pF
PHL2VCC=H L, TC : 1nF, C1=47pF

V

CC=5V, R1=10kΩ PULL UP

<

CS

0.4V

=

VBD1

VBAT=H L (to VCC)

V

CC=5V, R1=10kΩ PULL UP

VBD1

BAT=L H(to VCC)

V

V

CC=5V, R2=10kΩ PULL UP

VBD2

VBAT=H L (to VCC)

V

CC=5V, R2=10kΩ PULL UP

VBD2

BAT=L H (to VCC)

V

CC=5V, VBAT=0V

BAT

=3V)

-

mA

-

0.10 0.25 V

-

0.14 0.40 V

-

mA

-

2.0 2.4 V

-

30

-

µS

-

2.0 5 µS

-

0.8

-

mS

-

2.0 10 µS

2.60 2.70 2.80 V

0.05 0.10 0.20 V

2.45 2.55 2.65 V

0.05 0.10 0.20 V

-

0.2 0.4 V

Backup

circuit

unit

BD output sink current
Leakage current IBDH V

IBDSNK

VCC=5V, VBAT=0V, VBD=4V 1.0 3.0

CC=5V, VBAT=3V, VBD=5V

I/O voltage MM1027

V

SAT1

difference 1 MM1081 V
I/O voltage difference 2 V
I/O voltage difference 3 V
External transistor driving current
Power supply switching voltage
Hysteresis voltage V
Switching voltage
temperature characteristic

MM1027
MM1081 ±0.06

SAT2VBAT=3V, IO=10µA
SAT3VBAT=3V, IO=100µA

IBUD VCC=5V, V (TB) =4.5V 16 25

VBB VCC=H L, VBAT=3V 3.15 3.30 3.45 V

BB VCC=L H, VBAT=3V 0.05 0.10 0.20 V

BB/ T

V

VCC=0V, VBAT=3V, IO=0µA

Loss current I

LOS

D.CONT pin : GND

VCC=0V, VBAT=3V, IO=0µA

Reverse current I

OREV

D.CONT pin : OPEN

TC source current I

TCSCE VCC=5V, VTC=0V 2.0 3.0 5.0 µA

CC=5V, IO=70mA

V

CC=5V, IO=120mA

--

-

0.2 0.3

-

0.25 0.4

-

0.2 0.3 V

-

0.3 0.4 V

--

--

--

-

0.2 µA

-

±0.08

0.3 µA

0.1 µA

mA

V

mA

%/°C

MITSUMI

V

CC

V

BATT

V

OUT

CS

V

BD1

V

BD2

CS

VS

VBB

VBD2

VBD1

VS1

VBB

VBD2 VBD1

Timing Chart

System Reset (with battery back-up) MM1027, 1081

MITSUMI

System Reset (with battery back-up) MM1027, 1081

Application Circuits

(Example : MM1027XV)

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ON delay time

100m

10m

1m

100µ

10µ

1µ

0.1µ0.01µ0.001µ100p10p1p

Delay time (S)

Capacitance (F)

OFF delay time

Vs. Capacitance

ON delay time

OFF delay time

I

(mA)

5.000

.5000
/div

.0000

.0000 5.000

VI .5000/div (V)

CCONT
GND
CCONT
OPEN

IB

(µA)

2.400

0

.6000

/div

-

3.600
.0000

V

BAT=3V, IO=0µA

5.000

VI .5000/div (V)

5.000

.5000

/div

.0000

.0000

V

O

(V)

-

80.00

4.000

IO .8000/div (mA)

/div

.1000

V

OUT

VCC

5.000

V

BAT=3V

IB

(µA)

2.700

0

.9000

-

6.300

.0000

/div

VI .5000/div (V)

5.000

V

BAT=0

System Reset (with battery back-up) MM1027, 1081

Characteristics

CS pin ON delay time VS. Capacitance

Note : CS and CS

Characteristics

(MM1027X)

-----------------------------------------------------------

output waveforms may be disturbed if delay time is more than 10mS.

(MM1027 series)

Current consumption

Output voltage 1

Loss current during back-up

Shot key barrier diode reverse current

MITSUMI

3.000

V

O

(V)

.1000

2.000
.0000

/div

-

100.0

IO 10.00/div (V)

VCC=0V

ICS

(mA)

-

20.00

2.000

.0000

.0000

/div

5.000

VCS .5000/div (V)

CS pin
Sink current
V

CC=4.5V

V

CS=Variable

ICS

(mA)

-

5.000

5.000

.0000

.0000

/div

3.500

VCS .3500/div (V)

CS pin
Sink current
V

CC=3.5V

V

CS=Variable

ICS

(mA)

5.000

.5000

0000

000

/div

5.000

VCS .5000/div (V)

VCC=5V
V

CS=Variable

System Reset (with battery back-up) MM1027, 1081

Output voltage 2 3

ICS-VCS 2

ICS-VCS 1

ICS-VCS

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PPM

800

750

700

-

770

PPM/

°

C

-

706

PPM/

°

C

-

25 0 25 50 75 100 125

Tc pin

(C

T=1000PF±60PPM/

°

C)

Delay time

Ambient temperature (°C)

4.0

3.0

2.0
10 100

max.

typ.

min.

Detection voltage (V)

Resistor R1 (kΩ)

CS detection voltage

System Reset (with battery back-up) MM1027, 1081

ON delay time-Temperature

How to Adjust Detection Voltage Vs1

1.

Connecting a resistor between ADJ pin and Vcc pin
(effective only when lowering detection voltage)

Calculated min. and max. values take
into account resistance, etc. variance
inside the IC.

Refer to Figure 1

CS detection voltage adjustment (ADJ pin)

2. Using resistors to divide Vcc potential and connect
to ADJ pin

Detection voltage can be determined close to
external resistance value by setting external R2
and R3 values small.

Refer to Figure 2

(However, current increases when R2 and R3 are
made smaller, so set at around R

2+R3=6kΩ.)

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0.5mS 2V/Div

V

CC

CS

*

TC pin OPEN

0.5mS 2V/Div

V

CC

CS

*

TC pin 1000pF

0.5mS 2V/Div

V

CC

CS

*

TC pin OPEN

VCC

CS

*

TC pin 1000pF

CS detection voltage

adjustment (ADJ pin)

5

4

3

01234

max.

typ.

min.

Detection voltage

Resistor R2 (kΩ)

CS Output

System Reset (with battery back-up) MM1027, 1081

CS detection voltage adjustment (ADJ pin)

------------------------------------------

CS

Output

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4.0

4.5

5.0

50 60 70 80 90

100 110 120 130 140 150

Output voltage (V)

Output current (mA)

4.30

4.25

4.20

4.15

4.10

(V)

-

25 0 25 50 75 TEMP(°C)

H L

L H

VOUT-CS

47kΩ

CS open

0.0000 5.000

.5000/div

V

CC (V)

I

CC (µA)

300.0

30.00/div

.0000

3.45

3.40

3.35

3.30

3.25

-

25 0 25 50 75 TEMP(°C)

(V)

H L

L H

VCC
VBATT
VOUT
CS

B

D1,BD2

D.CONT:OPEN

BD1

D.CONT:GNO

BD2

D.CONT:GNO

CS

3.4V

3.6V

4.3V

5V

4.2V

3.5V

3.3V

3.4V

3.6V

4.3V

4.2V

2.53V

2.38V

2.35V

2.50V

3.0V

3.5V

3.3V

System Reset (with battery back-up) MM1027, 1081

Characteristics

(MM1081 series)

Input/output voltage difference 1
(Vcc=5.0V)

VCC-ICC

---------------------------

CS-CS

detection voltage-Temperature

Power supply switching voltage-Temperature

Timing Chart

The broken lines for CS and CS
to VCC by 12kΩ.

------------------------------------------------------

indicate timing when the ADJ pin is pulled up