BD4946FVE-TR - Rohm Semiconductor

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08.JUL.2012.Rev.006

Datasheet

Voltage Detector IC Series

Standard CMOS

Voltage Detector IC

BD48xxx series BD49xxx series

●General Description

ROHM’s BD48xxx and BD49xxx series are highly

accurate, low current consumption reset IC series. The

line up includes BD48xxx devices with N channel open

drain output and BD49xxx devices with CMOS output.

The devices are available for specific detection voltages

ranging from 2.3V to 6.0V in increments of 0.1V.

●Features

 High accuracy detection

 Ultra-low current consumption

 Two output types (Nch open drain and CMOS output)

 Wide Operating temperature range

 Very small and low height package

 Package SSOP5 is similar to SOT-23-5 (JEDEC)

 Package SSOP3 is similar to SOT-23-3 (JEDEC)

●Typical A pplication Circuit

●Key Specifications

 Detection voltage: 2.3V to 6.0V (Typ.),

0.1V steps

 High accuracy detection voltage: ±1.0%

 Ultra-low current consumption: 0.9A (Typ.)

 Operating temperature range: -40°C to +105°C

●Package

SSOP5: 2.90mm x 2.80mm x 1.15mm

SSOP3: 2.90mm x 2.80mm x 1.15mm

VSOF5: 1.60 mm x 1.60mm x 0.60mm

●Applications

Circuits using microcontrollers or logic circuits that

require a reset.

(Open Drain Output type）

BD48xxx series

DD1

BD48xxx

VDD2

GND

Micro

controller

( Capacitor for

noise filtering

）

○Product structure:Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays.

(CMOS Output type）

BD49xxx series

( Capacitor for

noise filtering）

VDD1

BD49xxx Micro

controller

RST

GND

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08.JUL.2012.Rev.006

BD48xxx series BD49xxx series

Datasheet

●Connection Diagram

SSOP5 VSOF5

●Pin Descriptions

SSOP5 VSOF5

PIN No. Symbol Function PIN No. Symbol Function

1 VOUT Reset Output 1 VOUT Reset Output

2 VDD Power Supply Voltage 2 SUB Substrate*

3 GND GND

3 N.C.

Unconnected Terminal

4 N.C. Unconnected Terminal 4 GND GND

5 N.C.

Unconnected Terminal 5 VDD Power Supply Voltage

*Connect the substrate to GND.

SSOP3(1pin GND) SSOP3(3pin GND)

●Pin Descriptions

SSOP3-1 SSOP3-2

PIN No. Symbol Function PIN No. Symbol Function

1 GND GND 1 VOUT Reset Output

2 VOUT Reset Output 2 VDD Power Supply Voltage

3 VDD Power Supply Voltage 3 GND GND

z Ordering Information

note)

Please be new and, in hope of SSOP5, choose the package 1 by "E" and package 2" G."

Lot. No

TOP VIEW

VOUT SUB N.C

VDD GND

Marking Lot. No

TOP VIEW

VOUT VDD GND

N.C. N.C.

Marking

1 2

GND VOUT

VDD

Marking Lot. No

TOP VIEW

VOUT VDD

GND

Marking Lot. No

TOP VIEW

Part Output Type Package1 Reset Voltage Value Package2 Packageing and

Number 48 : Open Drain 23 : 2.3V forming specification

49 : CMOS 0.1V step Embossed tape and reel

60 : 6.0V TR :The pin number 1is

the upper right

:SSOP5

:VSOF5

TL :The pin number 1is

Package1 Package2 Package name the upper left

E G SSOP5 :SSOP3-1

K G SSOP3(1pin GND) :SSOP3-2

L G SSOP3(3pin GND)

Blank FVE VSOF5

Blank G SSOP5

BDx x -T Rxxx x

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BD48xxx series BD49xxx series

Datasheet

(Unit : mm)

SSOP5

2.9±0.2

0.13

4°+6°

−4°

1.6

2.8±0.2

1.1±0.05

0.05±0.05

+0.2

−0.1

+0.05

−0.03

0.42+0.05

−0.04

0.95

123

1.25Max.

0.2Min.

0.1

Direction of feed

Reel

∗

Order quantity needs to be multiple of the minimum quantity.

Embossed carrier tapeTape

Quantity

Direction

of feed

The direction is the 1pin of product is at the upper right when you hold

reel on the left hand and you pull out the tape on the right hand

3000pcs

()

1pin

(Unit : mm)

VSOF5

1.2±0.05

1.0±0.05

0.6MAX

0.22±0.05

0.5

1.6±0.05

0.13±0.05

0.2MAX

1.6±0.05

(MAX 1.28 include BURR)

SSO

2.92±0.1

0.45

0.1

4°±4°

0.15

0.05

1.2

MAX 2.8±0.15

1.6±0.1

1.1±0.05

1.9±0.1

0.4±0.1

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BD48xxx series BD49xxx series

Datasheet

●Lineup

Marking Detection

Voltage

Part

Number Marking Detection

Voltage

Part

Number Marking Detection

Voltage

Part

Number Marking Detection

Voltage

Part

Number

EW 6.0V BD4860 EB 4.1V BD4841 GW 6.0V BD4960 GB 4.1V BD4941

EV 5.9V BD4859 EA 4.0V BD4840 GV 5.9V BD4959 GA 4.0V BD4940

EU 5.8V BD4858 DV 3.9V BD4839 GU 5.8V BD4958 FV 3.9V BD4939

ET 5.7V BD4857 DU 3.8V BD4838 GT 5.7V BD4957 FU 3.8V BD4938

ES 5.6V BD4856 DT 3.7V BD4837 GS 5.6V BD4956 FT 3.7V BD4937

ER 5.5V BD4855 DS 3.6V BD4836 GR 5.5V BD4955 FS 3.6V BD4936

EQ 5.4V BD4854 DR 3.5V BD4835 GQ 5.4V BD4954 FR 3.5V BD4935

EP 5.3V BD4853 DQ 3.4V BD4834 GP 5.3V BD4953 FQ 3.4V BD4934

EN 5.2V BD4852 DP 3.3V BD4833 GN 5.2V BD4952 FP 3.3V BD4933

EM 5.1V BD4851 DN 3.2V BD4832 GM 5.1V BD4951 FN 3.2V BD4932

EL 5.0V BD4850 DM 3.1V BD4831 GL 5.0V BD4950 FM 3.1V BD4931

EK 4.9V BD4849 DL 3.0V BD4830 GK 4.9V BD4949 FL 3.0V BD4930

EJ 4.8V BD4848 DK 2.9V BD4829 GJ 4.8V BD4948 FK 2.9V BD4929

EH 4.7V BD4847 DJ 2.8V BD4828 GH 4.7V BD4947 FJ 2.8V BD4928

EG 4.6V BD4846 DH 2.7V BD4827 GG 4.6V BD4946 FH 2.7V BD4927

EF 4.5V BD4845 DG 2.6V BD4826 GF 4.5V BD4945 FG 2.6V BD4926

EE 4.4V BD4844 DF 2.5V BD4825 GE 4.4V BD4944 FF 2.5V BD4925

ED 4.3V BD4843 DE 2.4V BD4824 GD 4.3V BD4943 FE 2.4V BD4924

EC 4.2V BD4842 DD 2.3V BD4823 GC 4.2V BD4942 FD 2.3V BD4923

Marking Detection

Voltage

Part

Number Marking Detection

Voltage

Part

Number Marking Detection

Voltage

Part

Number Marking Detection

Voltage

Part

Number

Cm 6.0V BD48E60 Be 4.1V BD48E41 Ff 6.0V BD49E60 Ea 4.1V BD49E41

Ck 5.9V BD48E59 Bd 4.0V BD48E40 Fe 5.9V BD49E59 Dy 4.0V BD49E40

Ch 5.8V BD48E58 Bc 3.9V BD48E39 Fd 5.8V BD49E58 Dr 3.9V BD49E39

Cg 5.7V BD48E57 Bb 3.8V BD48E38 Fc 5.7V BD49E57 Dp 3.8V BD49E38

Cf 5.6V BD48E56 Ba 3.7V BD48E37 Fb 5.6V BD49E56 Dn 3.7V BD49E37

Ce 5.5V BD48E55 Ay 3.6V BD48E36 Fa 5.5V BD49E55 Dm 3.6V BD49E36

Cd 5.4V BD48E54 Ar 3.5V BD48E35 Ey 5.4V BD49E54 Dk 3.5V BD49E35

Cc 5.3V BD48E53 Ap 3.4V BD48E34 Er 5.3V BD49E53 Dh 3.4V BD49E34

Cb 5.2V BD48E52 An 3.3V BD48E33 Ep 5.2V BD49E52 Dg 3.3V BD49E33

Ca 5.1V BD48E51 Am 3.2V BD48E32 En 5.1V BD49E51 Df 3.2V BD49E32

By 5.0V BD48E50 Ak 3.1V BD48E31 Em 5.0V BD49E50 De 3.1V BD49E31

Br 4.9V BD48E49 Ah 3.0V BD48E30 Ek 4.9V BD49E49 Dd 3.0V BD49E30

Bp 4.8V BD48E48 Ag 2.9V BD48E29 Eh 4.8V BD49E48 Dc 2.9V BD49E29

Bn 4.7V BD48E47 Af 2.8V BD48E28 Eg 4.7V BD49E47 Db 2.8V BD49E28

Bm 4.6V BD48E46 Ae 2.7V BD48E27 Ef 4.6V BD49E46 Da 2.7V BD49E27

Bk 4.5V BD48E45 Ad 2.6V BD48E26 Ee 4.5V BD49E45 Cy 2.6V BD49E26

Bh 4.4V BD48E44 Ac 2.5V BD48E25 Ed 4.4V BD49E44 Cr 2.5V BD49E25

Bg 4.3V BD48E43 Ab 2.4V BD48E24 Ec 4.3V BD49E43 Cp 2.4V BD49E24

Bf 4.2V BD48E42 Aa 2.3V BD48E23 Eb 4.2V BD49E42 Cn 2.3V BD49E23

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BD48xxx series BD49xxx series

Datasheet

Marking Detection

Voltage Part Number Marking Detection

Voltage

Part

Number Marking Detection

Voltage

Part

Number

Cm 6.0V BD48K60 Be 4.1V BD48K41 Ff 6.0V BD49K60 Ea 4.1V BD49K41

Ck 5.9V BD48K59 Bd 4.0V BD48K40 Fe 5.9V BD49K59 Dy 4.0V BD49K40

Ch 5.8V BD48K58 Bc 3.9V BD48K39 Fd 5.8V BD49K58 Dr 3.9V BD49K39

Cg 5.7V BD48K57 Bb 3.8V BD48K38 Fc 5.7V BD49K57 Dp 3.8V BD49K38

Cf 5.6V BD48K56 Ba 3.7V BD48K37 Fb 5.6V BD49K56 Dn 3.7V BD49K37

Ce 5.5V BD48K55 Ay 3.6V BD48K36 Fa 5.5V BD49K55 Dm 3.6V BD49K36

Cd 5.4V BD48K54 Ar 3.5V BD48K35 Ey 5.4V BD49K54 Dk 3.5V BD49K35

Cc 5.3V BD48K53 Ap 3.4V BD48K34 Er 5.3V BD49K53 Dh 3.4V BD49K34

Cb 5.2V BD48K52 An 3.3V BD48K33 Ep 5.2V BD49K52 Dg 3.3V BD49K33

Ca 5.1V BD48K51 Am 3.2V BD48K32 En 5.1V BD49K51 Df 3.2V BD49K32

By 5.0V BD48K50 Ak 3.1V BD48K31 Em 5.0V BD49K50 De 3.1V BD49K31

Br 4.9V BD48K49 Ah 3.0V BD48K30 Ek 4.9V BD49K49 Dd 3.0V BD49K30

Bp 4.8V BD48K48 Ag 2.9V BD48K29 Eh 4.8V BD49K48 Dc 2.9V BD49K29

Bn 4.7V BD48K47 Af 2.8V BD48K28 Eg 4.7V BD49K47 Db 2.8V BD49K28

Bm 4.6V BD48K46 Ae 2.7V BD48K27 Ef 4.6V BD49K46 Da 2.7V BD49K27

Bk 4.5V BD48K45 Ad 2.6V BD48K26 Ee 4.5V BD49K45 Cy 2.6V BD49K26

Bh 4.4V BD48K44 Ac 2.5V BD48K25 Ed 4.4V BD49K44 Cr 2.5V BD49K25

Bg 4.3V BD48K43 Ab 2.4V BD48K24 Ec 4.3V BD49K43 Cp 2.4V BD49K24

Bf 4.2V BD48K42 Aa 2.3V BD48K23 Eb 4.2V BD49K42 Cn 2.3V BD49K23

Marking Detection

Voltage Part Number Marking Detection

Voltage

Part

Number Marking Detection

Voltage

Part

Number

Kb 6.0V BD48L60 Gn 4.1V BD48L41 Np 6.0V BD49L60 Mg 4.1V BD49L41

Ka 5.9V BD48L59 Gm 4.0V BD48L40 Nn 5.9V BD49L59 Mf 4.0V BD49L40

Hy 5.8V BD48L58 Gk 3.9V BD48L39 Nm 5.8V BD49L58 Me 3.9V BD49L39

Hr 5.7V BD48L57 Gh 3.8V BD48L38 Nk 5.7V BD49L57 Md 3.8V BD49L38

Hp 5.6V BD48L56 Gg 3.7V BD48L37 Nh 5.6V BD49L56 Mc 3.7V BD49L37

Hn 5.5V BD48L55 Gf 3.6V BD48L36 Ng 5.5V BD49L55 Mb 3.6V BD49L36

Hm 5.4V BD48L54 Ge 3.5V BD48L35 Nf 5.4V BD49L54 Ma 3.5V BD49L35

Hk 5.3V BD48L53 Gd 3.4V BD48L34 Ne 5.3V BD49L53 Ky 3.4V BD49L34

Hh 5.2V BD48L52 Gc 3.3V BD48L33 Nd 5.2V BD49L52 Kr 3.3V BD49L33

Hg 5.1V BD48L51 Gb 3.2V BD48L32 Nc 5.1V BD49L51 Kp 3.2V BD49L32

Hf 5.0V BD48L50 Ga 3.1V BD48L31 Nb 5.0V BD49L50 Kn 3.1V BD49L31

He 4.9V BD48L49 Fy 3.0V BD48L30 Na 4.9V BD49L49 Km 3.0V BD49L30

Hd 4.8V BD48L48 Fr 2.9V BD48L29 My 4.8V BD49L48 Kk 2.9V BD49L29

Hc 4.7V BD48L47 Fp 2.8V BD48L28 Mr 4.7V BD49L47 Kh 2.8V BD49L28

Hb 4.6V BD48L46 Fn 2.7V BD48L27 Mp 4.6V BD49L46 Kg 2.7V BD49L27

Ha 4.5V BD48L45 Fm 2.6V BD48L26 Mn 4.5V BD49L45 Kf 2.6V BD49L26

Gy 4.4V BD48L44 Fk 2.5V BD48L25 Mm 4.4V BD49L44 Ke 2.5V BD49L25

Gr 4.3V BD48L43 Fh 2.4V BD48L24 Mk 4.3V BD49L43 Kd 2.4V BD49L24

Gp 4.2V BD48L42 Fg 2.3V BD48L23 Mh 4.2V BD49L42 Kc 2.3V BD49L23

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BD48xxx series BD49xxx series

Datasheet

●Absolute Maximum Ratings (Ta=25°C)

Parameter Symbol Limits Unit

Power Supply Voltage VDD-GND -0.3 to +10 V

Nch Open Drain Output GND-0.3 to +10

Output Voltage CMOS Output VOUT GND-0.3 to VDD+0.3 V

SSOP5 *1*3 540 Power

Dissipation VSOF5 *2*3 Pd 210 mW

Operating Temperature Topr -40 to +105 °C

Ambient Storage Temperature Tstg -55 to +125 °C

*1 Use above Ta=25°C results in a 5.4mW loss per degree.

*2 Use above Ta=25°C results in a 2.1mW loss per degree.

*3 When a ROHM standard circuit board (70mm×70mm×1.6mm glass epoxy board) is mounted.

●Electrical Characteristics (Un l ess Otherwise Specified Ta=-40 to 105°C)

Limit

Parameter Symbol Condition Min. Typ. Max.

Unit

Detection Voltage VDET RL=470k, VDD=HÆL *1 VDET(T)

×0.99 VDET(T) VDET(T)

×1.01 V

Output Delay Time “LÆH” tPLH CL=100pF RＬ=100k *2

Vout=GNDÆ50% - - 100 µs

VDET=2.3-3.1V - 0.51 1.53

VDET=3.2-4.2V - 0.56 1.68

VDET=4.3-5.2V - 0.60 1.80

Circuit Current when ON ICC1 VDD=VDET-0.2V *1

VDET=5.3-6.0V - 0.66 1.98

µA

VDET=2.3-3.1V - 0.75 2.25

VDET=3.2-4.2V - 0.80 2.40

VDET=4.3-5.2V - 0.85 2.55

Circuit Current when OFF ICC2 VDD=VDET+2.0V *1

VDET=5.3-6.0V - 0.90 2.70

µA

VOL0.4V, Ta=25 to 105°C, RL=470k 0.95 - -

Operating Voltage Range VOPL VOL0.4V, Ta=-40 to 25°C, RL=470k 1.20 - -

VDS=0.5V, VDD=1.5V, VDET=2.3-6.0V 0.4 1.0 -

‘Low’Output Current (Nch) IOL VDS=0.5V, VDD=2.4V, VDET=2.7-6.0V 2.0 4.0 -

VDS=0.5V, VDD=4.8V, VDET=2.3-4.2V 0.7 1.4 -

VDS=0.5V, VDD=6.0V, VDET=4.3-5.2V 0.9 1.8 -

‘High’Output Current (Pch)

(BD49xxx Series) IOH

VDS=0.5V, VDD=8.0V, VDET=5.3-6.0V 1.1 2.2 -

Leak Current when OFF

(BD48xxx Series) Ileak VDD=VDS=10V *1 - - 0.1 µA

Detection Voltage

Temperature coefficient VDET/T Ta=-40°C to 105°C

(Designed Guarantee) - ±100 ±360 ppm/°C

Hysteresis Voltage VDET VDD=LÆHÆL VDET×0.03 VDET×0.05 VDET×0.08 V

VDET(T) : Standard Detection Voltage(2.3V to 6.0V, 0.1V step)

RL: Pull-up resistor to be connected between VOUT and power supply.

CL: Capacitor to be connected between VOUT and GND.

Designed Guarantee. (Outgoing inspection is not done on all products.)

*1 Guarantee is Ta=25°C.

*2 tPLH:VDD=(VDET typ.-0.5V)Æ(VDET typ.+0.5V)

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BD48xxx series BD49xxx series

Datasheet

●Block Diagrams

Fig.1 BD48xxx series

Fig.2 BD49xxx series

VOUT

VDD

GND

Vref

VOUT

VDD

GND

Vref

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BD48xxx series BD49xxx series

Datasheet

●Typical Performan ce Curves

Fig.3 Circuit Current

0.0

0.5

1.0

1.5

2.0

012345678910

VDD SUPPLY VOLTAGE ：VDD[V]

CIRCUIT CURRENT ： IDD[A]

【BD4842G/FVE】

0.0 0.5 1.0 1.5 2.0 2.5

DRAIN-SOURCE VOLTAGE ： VDS

[V]

"LOW" OUTPUT CURRENT ： IOL[mA]

【BD4842G/FVE】

VDD=2.4V

VDD=1.2V

Fig.4 “Low” Output Current

Fig.6 I/O Characteristics

00.5 11.522.5 33.544.5 55.5

VDD SUPPLY VOLTAGE ：VDD[V]

OUTPUT VOLTAGE

： VOUT[V]

【BD4842G/FVE】

Ta=25℃

0123456

DRAIN-SOURCE VOLTAGE ： VDS[V]

"HIGH" OUTPUT CURRENT ： IOH[mA]

【BD4942G/FVE】

VDD=8.0V

VDD=6.0V

VDD=4.8V

Fig.5 “High” Output Current

【BD49x42】

【BD48x42】

【BD49x42】

【BD48x42】

【BD49x42】

【BD48x42】

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BD48xxx series BD49xxx series

Datasheet

Fig.7 Operating Limit Voltage

[V]

0.0

0.2

0.4

0.6

0.8

1.0

0 0.5 1 1.5 2 2.5

SUPPLY VOLTAGE :

OUTPUT VOLTAGE :

OUT [V]

【

BD4842G/FVE

】

Fig.9 Circuit Current when ON

0.0

0.5

1.0

1.5

-40 -20 0 20 40 60 80 100

TEMPERATURE ： Ta[℃]

CIRCUIT CURRENT WHEN ON ： IDD1[μA]

【BD4842G/FVE】

Fig.10 Circuit Current when OFF

0.0

0.5

1.0

1.5

-40 -20 0 20 40 60 80 100

TEMPERATURE ： Ta[℃]

CIRCUIT CURRENT WHEN OFF ： IDD2[μA]

【BD4842G/FVE】

【 BD48x42x

】

【 BD48x42x

】【 BD48x42x 】

【BD49x42】

【BD48x42】

【BD49x42】

【BD48x42】

【BD49x42】

【BD48x42】

Fig.8 Detection Voltage

Release Voltage

3.0

3.4

3.8

4.2

4.6

5.0

5.4

-40 0 40 80

TEMPERATURE

: Ta[℃]

DETECTION VOLTAGE: VDET[V]

【

BD4842G/FVE】

Low to High(V

DET

+ΔV

DET

）

High to Low(V

DET

）

～

【 BD48x42x 】

【BD49x42】

【BD48x42】

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BD48xxx series BD49xxx series

Datasheet

Fig.11 Operating Limit Voltage

0.0

0.5

1.0

1.5

-40 -20 0 20 40 60 80 100

TEMPERATURE ： Ta[℃]

MINIMUM OPERATION VOLTAGE ： VOPL[V]

【BD4842G/FVE】

【 BD48x42x

】

【BD49x42】

【BD48x42】

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08.JUL.2012.Rev.006

BD48xxx series BD49xxx series

Datasheet

●Applic a tion Informa tion

Explanation of Operation

For both the open drain type (Fig.12) and the CMOS output type (Fig.13), the detection and release voltages are used as

threshold voltages. When the voltage applied to the VDD pins reaches the applicable threshold voltage, the VOUT terminal

voltage switches from either “High” to “Low” or from “Low” to “High”. Please refer to the Timing Waveform and Electrical

Characteristics for information on hysteresis.

Because the BD48xxx series uses an open drain output type, it is possible to connect a pull-up resistor to VDD or another

power supply [The output “High” voltage (VOUT) in this case becomes VDD or the voltage of the other power supply].

Fig.12 (BD48xxx series Internal Block Diagram) Fig.13 (BD49xxx series Internal Block Diagram)

Reference Data

Examples of Leading (tPLH) and Falling (tPHL) Output

Part Number tPLH (s) tPHL (s)

BD48x45 39.5 87.8

BD49x45 32.4 52.4

DD=4.3VÆ5.1V VDD=5.1VÆ4.3V

*This data is for reference only.

The figures will vary with the application, so please confirm actual operating conditions before use.

Timing Wa veform

Example: the following shows the relationship between the input voltages VDD and the output voltage VOUT when the

input power supply voltage VDD is made to sweep up and sweep down (the circuits are those in Fig.12 and 13).

1 When the power supply is turned on, the output is unsettled from

after over the operating limit voltage (VOPL) until tPHL. Therefore it is

possible that the reset signal is not valid when the rise time of VDD is

faster than tPHL.

2 When VDD is greater than VOPL but less than the reset release

voltage (VDET + VDET), the output voltages will switch to Low.

3 If VDD exceeds the reset release voltage (VDET + VDET), then

VOUT switches from L to H.

4 If VDD drops below the detection voltage (VDET) when the power

supply is powered down or when there is a power supply fluctuation,

VOUT switches to L (with a delay of tPHL).

5 The potential difference between the detection voltage and the

release voltage is known as the hysteresis width (VDET). The

system is designed such that the output does not flip-flop with power

supply fluctuations within this hysteresis width, preventing

malfunctions due to noise.

VDD

VDET+ΔVDET

VDET

VOPL

tPHL

① ②

VOUT

tPLH

tPHL

tPLH

③ ④

VOL

VOH

⑤

Fig.14 Timing Waveform

Vref

VDD

GND

VOUT

Vref

VDD

VOUT

GND

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08.JUL.2012.Rev.006

BD48xxx series BD49xxx series

Datasheet

●Circuit A pplications

Examples of a common power supply detection reset circuit.

Application examples of BD48xxx series (Open Drain

output type) and BD49xxx series (CMOS output type) are

shown below.

CASE1: the power supply of the microcontroller (VDD2)

differs from the power supply of the reset detection (VDD1).

Use an open drain output type (BD48xxx) device with a

load resistance RL attached as shown in figure 15.

CASE2: the power supply of the microcontroller (VDD1) is

same as the power supply of the reset detection (VDD1).

Use a CMOS output type (BD49xxx) device or an open

drain device with a pull up resistor between output and

VDD1.

When a capacitance CL for noise filtering is connected to

the VOUT pin (the reset signal input terminal of the

microcontroller), please take into account the waveform of

the rise and fall of the output voltage (VOUT).

The Electrical characteristics were measured using

RL= 470k and CL = 100pF.

Fig.16 CMOS Output Type

DD1

BD48xxx

VDD2

GND

Micro

controller

( capacitor is for

noise filtering ）

(

capacitor is for

filtering

）

DD1

BD49xxx Micro

controller

RST

GND

Fig.15 Open Drain Output Type

TSZ22111･15･001 13/13

08.JUL.2012.Rev.006

BD48xxx series BD49xxx series

Datasheet

●Operational Notes

1 . Absolute maximum range

Absolute Maximum Ratings are those values beyond which the life of a device may be destroyed. We cannot be defined the

failure mode, such as short mode or open mode. Therefore a physical security countermeasure, like fuse, is to be given when

a specific mode to be beyond absolute maximum ratings is considered.

2 . GND potential

GND terminal should be a lowest voltage potential every state.

Please make sure all pins, which are over ground even if, include transient feature.

3 . Electrical Characteristics

Be sure to check the electrical characteristics that are one the tentative specification will be changed by temperature, supply

voltage, and external circuit.

4 . Bypass Capacitor for Noise Rejection

Please put into the capacitor of 1F or more between VDD pin and GND, and the capacitor of about 1000pF between VOUT pin

and GND, to reject noise. If extremely big capacitor is used, transient response might be late. Please confirm sufficiently for the

point.

5 . Short Circuit between Terminal and Soldering

Don’t short-circuit between Output pin and VDD pin, Output pin and GND pin, or VDD pin and GND pin. When soldering the IC

on circuit board, please be unusually cautious about the orientation and the position of the IC. When the orientation is

mistaken the IC may be destroyed.

6 . Electromagnetic Field

Mal-function may happen when the device is used in the strong electromagnetic field.

7 . The VDD line inpedance might cause oscillation because of the detection current.

8. A V

DD -GND capacitor (as close connection as possible) should be used in high VDD line impedance condition.

9 . Lower than the mininum input voltage makes the VOUT high impedance, and it must be VDD in pull up (VDD) condition.

10. This IC has extremely high impedance terminals. Small leak current due to the uncleanness of PCB surface might cause

unexpected operations. Application values in these conditions should be selected carefully. If the leakage is assumed

between the VOUT terminal and the GND terminal, the pull-up resistor should be less than 1/10 of the assumed leakage

resistance.

11. External parameters

The recommended parameter range for RL is 10k to 1M. There are many factors (board layout, etc) that can affect

characteristics. Please verify and confirm using practical applications.

12. Power on reset operation

Please note that the power on reset output varies with the VDD rise up time. Please verify the actual operation.

13. Precautions for board inspection

Connecting low-impedance capacitors to run inspections with the board may produce stress on the IC. Therefore, be certain

to use proper discharge procedure before each process of the test operation.

To prevent electrostatic accumulation and discharge in the assembly process, thoroughly ground yourself and any

equipment that could sustain ESD damage, and continue observing ESD-prevention procedures in all handing, transfer and

storage operations. Before attempting to connect components to the test setup, make certain that the power supply is OFF.

Likewise, be sure the power supply is OFF before removing any component connected to the test setup.

14. When the power supply, is turned on because of in certain cases, momentary Rash-current flow into the IC at the logic

unsettled, the couple capacitance, GND pattern of width and leading line must be considered.

Status of this document

The Japanese version of this document is formal specification. A customer may use this translation version only for a reference

to help reading the formal version.

If there are any differences in translation version of this document formal version takes priority.

Datasheet

Notice - Rev.003

Notice

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Datasheet

Notice - Rev.003

●Precaution for Mounting / Circuit board design

1) When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product

performance and reliability.

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ROHM representative in advance.

For details, please refer to ROHM Mounting specification

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Datasheet

Notice - Rev.003

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