Datasheet MM1245BF, MM1245CD, MM1245CF, MM1134BF, MM1026BF Datasheet (MITSMI)

MITSUMI

System Reset (with battery back-up) MM1026, 1245, 1080, 1134

System Reset (with battery back-up)

Monolithic IC MM1026, 1245, 1080 ,1134

Outline

These ICs protect S-RAM data in back-up mode (CS signal makes R-SAM CE pin low and CE

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

pin high) when
power supply voltage goes below a certain set voltage (detection voltage 3.5V, 4.2V or 4.5V typ.). Further, it
switches from main power supply to battery back-up when power supply voltage drops. Conversely, when
power supply rises, it first switches the S-RAM from battery back-up to main power supply (switching voltage

3.3V typ.), then 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.

Features

MM1026

• Power supply switching circuit (switching between main power supply and battery)

• CS control for S-RAM (normal mode : S-RAM can be accessed; back-up mode: S-RAM can not be
accessed low current consumption mode)

• Reset output

MM1245

• Power supply switching circuit

• CS control for S-RAM

• CS control signal delay, power supply line chattering removal approx. 1S max.

• Supply current from main power supply can be increased by external power transistor

MM1080

• Power supply switching circuit

• CS control for S-RAM

• Low current consumption 60µA typ.

MM1134

• Power supply switching circuit

• CS control for S-RAM

• Gate circuit with CS signal

Characteristics

1. Battery back-up

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

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

O=100µA 0.3V typ.

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

2. Normal operation

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

O=50µA 0.2V typ.

2. Output voltage V

CC=5V IO=50mA 4.8V typ.

3. Battery-V

CC switching voltage 3.3V typ.

4. Detection voltage (CS, CS

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

, reset output) A : 3.5V typ.

B : 4.2V typ.
C : 4.5V typ.

MITSUMI

System Reset (with battery back-up) MM1026, 1245, 1080, 1134

Package

DIP-8B (MM D)
SOP-8C (MM F)

*

contains detection voltage rank.

Applications

1. Memory cards (S-RAM cards)

2. PCs, word processors

3. Fax machines, photocopiers, other office equipment

4. Sequence controllers, other FA equipment

5. Video games and other equipment with S-RAMs

Pin no.

Pin name

MM1026 MM1245 MM1080 MM1134

1 GND GND GND GND
2

RESET

T

C NC

RESET

3 CS CS CS CS
4 V

BATT VBATT VBATT VBATT

5

CS CS

NC

CS

6 V

OUT VOUT VOUT VOUT

7 NC Tr.B NC Y
8 V

CC VCC VCC VCC

Pin Assignment

1432

8567

DIP-8P(C)/SOP-8P(C)/SOP-8P(C) Taping

Block Diagram

MM1026

MITSUMI

System Reset (with battery back-up) MM1026, 1245, 1080, 1134

MM1080

MM1134

MM1245

MITSUMI

System Reset (with battery back-up) MM1026, 1245, 1080, 1134

Equivalent Circuit Diagram

MM1026

MM1245

MITSUMI

System Reset (with battery back-up) MM1026, 1245, 1080, 1134

Absolute Maximum Ratings

(Ta=25°C)

Item Symbol Rating Units

Storage temperature T

STG

-

40~+125

°

C

Operating temperature T

OPR

-

20~+75

°

C

Power supply voltage V

CC max. 7 V

Operating voltage V

CCOP 7V

Allowable loss Pd 300 mW

MM1245

Output current

MM1026

I

O1

80 mA

MM1134
MM1080 50 mA

Output current I

O2 200 µA

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

MM1080

MM1134

MITSUMI

System Reset (with battery back-up) MM1026, 1245, 1080, 1134

Electrical Characteristics

(Except where noted otherwise, Ta=25°C, VCC=VRS=5V, RRS=10kΩ)

Item

Symbol

Measurement conditions Min. Typ. Max. Units

MM1026 2.0 mA

Consumption MM1245

I

CC VCC=5V, VBATT=3V, IO1=0mA

0.6 1.0 1.4 mA

current MM1080 60 120 µA

MM1134 1.4 2.2 mA

I/O voltage difference 1 V

SAT1VCC=5V, VBATT=3V, IO1=1mA 0.03 0.05 V

Output voltage 1 V

O1VCC=5V, VBATT=3V, IO1=1mA 4.95 4.97 V

I/O voltage difference 2

MM1245 VSAT2VCC=5V, VBATT=3V, IO1=30mA 0.15 0.30 V
MM1026

Output voltage 2 MM1134 V

O2

V

CC=5V, VBATT=3V, IO1=15mA 4.75 4.90 V

MM1080 V

CC=5V, VBATT=3V, IO1=30mA 4.5 4.7 V

I/O voltage difference 3

MM1245 VSAT3VCC=5V, VBATT=3V, IO1=80mA 0.30 0.50

Output voltage 3

Except MM1245

VO3VCC=5V, VBATT=3V, IO1=50mA 4.7 4.8 V

A type 3.35 3.50 3.65 V

Detection voltage B type V

S VCC=H L 4.05 4.20 4.35 V

C type 4.30 4.50 4.70 V

Hysteresis voltage V

S VCC=L H 100 mV

Maximum base

driving current

MM1245 I

BUF VCC=5V, VBUF=4.5V 14 20 26 mA

Reset output voltage L

MM1026 VRSL VCC=3V 0.2 0.4 V

Reset leakage current H

MM1134 IRSH VCC=5V, VRS=7.0V ±0.01 ±0.1 µA

Reset operation

limit voltage

V

OPL VRSL

<
=

0.4V, V

CC=H L 0.8 1.2 V

CS output voltage L V

CSL VCC=3.7V, VBATT=3V, ICS=1µA 0.1 V

CS output voltage H V

CSH VCC=5V, VBATT=3V, ICS=

-

1µA 4.90 V

CS

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

output voltage L VCSL VCC=5V, VBATT=3V, ICS=1µA 0.1 V

CS

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

output voltage H VCSH VCC=3.7V, VBATT=3V, ICS=-1µA

VO-

0.1

V

Detection voltage temperature characteristic

VS/ T ±0.05 %/°C

ON delay time

MM1245

Td

ON CTC=OPEN 50 µS

OFF delay time Td

OFF CTC=OPEN 5 µS

T

C pin charge current

MM1245

ITC VCC=5V, VBATT=3V, VTC=0V 0.60 0.80 1.10 µA

CS source current I

CSSOU VCC=5V, VBATT=3V, VCS=4.5V 25 50 80 µA

Power supply switching voltage V

B VCC=H L 3.15 3.30 3.45 V

Hysteresis voltage V

B VCC=L H 100 mV

Switching voltage temperature characteristic

VB/ T ±0.05 %/°C

Loss current I

BL VCC=0V, VBATT=3V, IO2=0µA 0.1 µA

I/O voltage difference 2 Vsat2 V

CC=0V, VBATT=3V, IO2=1µA 0.2 0.3 V

Output voltage 4 V

04VCC=0V, VBATT=3V, IO2=1µA 2.7 2.8 V

Output voltage 5 V

05VCC=0V, VBATT=3V, IO2=100µA 2.6 2.7 V

Reverse current I

OREV VCC=5V, VBATT=0V 0.1 µA

Y

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

pin LO H

level current

MM1134 I

YLO VCC=5V, VBATT=3V, VY=0V 150 400

µA

Reference voltage (typical) V

REF 1.25 V

MM1080
(CS only)
MM1026
MM1245
MM1134

Note : Detection voltage ranks A, B MM1026

B MM1134, MM1080

B, C MM1245

MITSUMI

System Reset (with battery back-up) MM1026, 1245, 1080, 1134

Timing Chart

VCC

RESET

CS

V

OUT

CS

0V

0V

0V

0V

V

S

V

B

V

OPL

VE

VS

VRSL

VCSH

VCSL

VCSH

VO1,O2,O3

VRSH

VCSL

VO4,O5

VCC

TC

CS

V

OUT

CS

VE

VS

VS
VB
VOPL

VTH

VCSLVCSL

VO1,O2,O3

VCSL

VO4,O5

VCSL

Set inside IC

Delay

VCC

VS
VB

BATTERY

CS

V

OUT

VS

VCSL

VCSL

VO1,O2

VO3,O4

VE

0V

0V

0V

0V

2.8V

4.8V

VCC

Y

CS

V

OUT

CS

VE

VS

VS
VB
VOPL

VCSL

VCSL

*

VY

VO1,O2,O3

VO4,O5

VCSL

VRSL

VCSL

0V

0V

0V

0V

0V

RESET

MM1026 MM1245

MM1080 MM1134

Characteristics

(MM1026, MM1134 series)

VOUT (V)

3.000

0.100/div

2.000

IOUT (mA)

0 1.000

0.100/div

VOUT (V)

(V)

5.000

.0500/div

4.500

IOUT (mA)

.0000

-

100.0

10.00/div

VOUT-IOUT (VCC=5.0V) VOUT-IOUT (VBAT=3.0V)

*

Use Y

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

pin input voltage at less than 5V when VCC

<
=

Vs.

MITSUMI

System Reset (with battery back-up) MM1026, 1245, 1080, 1134

IBAT (nA)

40.00

5.000/div

-

10.00

0

VCC (V)

0 10.00

1.000/div

VCC-IBAT

ICC (mA)

5.000

.5000/div

.0000

.0000

VCC (V)

10.00

1.000/div

VCC-ICC

2.0

1.0

0.0

-

50 0 50 100

Current consumption

(mA)

Ambient temperature (°C)

Current consumption-Temperature
characteristics

IOL=50mA

I

OL=10mA

0.3

0.2

0.1

-

50 0 50 100

Output voltage

1, 2 (V)

Ambient temperature (°C)

Output voltage 1, 2-Temperature
characteristics

IOL=100µA

I

OL=1µA

-

50 0 50 100

0.2

0.1

0

0.5

0.4

0.3

Output voltage 3, 4 (V)

Ambient temperature (°C)

Output voltage 3, 4-Temperature

10nA

100nA

1µA

-80-500 50 100

Reverse current

Ambient temperature (°C)

Reverse current-Temperature

10nA

100nA

1µA

-

80

-500 50 100

Loss current

Ambient temperature (°C)

Loss current-Temperature

MITSUMI

System Reset (with battery back-up) MM1026, 1245, 1080, 1134

5.000

0.5000

0.0000
.0000

/div

V

OUT

(V)

100.0

I

OUT 10.00/div (mA)

Current consumption-Temperature (Vcc=5V)

100.0

10.00

.0000

.0000 5.000

/div

I

IN

(µA)

V

IN .5000/div (V)

VIN-IIN

5.000

.0000

.0000

/div

V

OUT

(V)

.5000

200.0

I

OUT 20.00/div (µA)

VOUT-IOUT (VBAT-3.0V)

1.000

.2000

-

1.000
.0000

/div

I

BATT

(µA)

5.000

V

IN .5000/div (V)

0

VIN-IBATT

-

25 0 25 50 75

TEMP (

°

C)

(µA)

80

70

60

50

Current consumption-Temperature (VCC=5V)

Hysteresis voltage

(V)

3.3

3.2

3.1

3.0

-

250 255075

TEMP (

°

C)

50

100

150

(mV)

Hysteresis voltage

VBAT detection voltage

VBAT detection voltage-Temperature

Hysteresis voltage

(V)

4.5

4.0

3.5

-

25 0 25 50 75

TEMP (

°

C)

100

150

(mV)

Hysteresis voltage

CS detection voltage

CS detection voltage-Temperature

Characteristics

(MM1080 series)

MITSUMI

System Reset (with battery back-up) MM1026, 1245, 1080, 1134

5.00

4.90

4.80

4.70

4.60

4.50

4.40

4.30

4.20

4.10

4.00
5 25456585105125

VOUT

IOUT (mA)

IOUT-VOUT

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

-

250 255075

Temperature (°C)

VOUT-CS

47kΩ

CS open

Current consumption

(mA)

Current consumption-Temperature

4.4

4.35

4.3

4.25

4.2

4.15

4.1

-

25 0 25 50 75

voltage (V)

Temperature (°C)

CS detection voltage-Temperature

OFF delay time

10

1

100m

10m

1m

100µ

10µ

1µ

1µ

0.1µ

0.01µ0.001µ

100p10p

Use 1S max. for CS-CS pin ON delay time.

Delay time (S)

Capacitance (F)

ON delay time

CS-CS pin ON/OFF delay time vs. capacitance TC

3.5

3.45

3.4

3.35

3.3

3.25

3.2

-

25 0 25 50 75

Voltage (V)

Temperature (°C)

VBAT detection voltage-Temperature

Characteristics

(MM1245 series)