Technical Note

2/13

BU7344HFV,BU7345HFV,BU7346GUL

www.rohm.com

2011.01 - Rev.A

© 2011 ROHM Co., Ltd. All rights reserved.

●

Absolute maximum ratings (Ta=25 ℃)

Parameter

Symbol

Ratings

Unit

Supply voltage

VDD

-0.3 ~ 4.0

V

Input voltage

VIN

-0.3 ~ VDD+0.3

V

Storage temperature range

Tstg

-55 ~ 125

℃

Power dissipation

Pd

410(BU7344HFV,BU7345HFV)

*1

mW

460(BU7346GUL)

*2

*1 Mounted on 70mm * 70mm * 1.6mm Glass-epoxy PCB. Derating: 4.1mW / ℃ at Ta > 25°C

*2 Mounted on 50mm * 58mm * 1.75mm Glass-epoxy PCB. Derating: 4.6mW / ℃ at Ta > 25°C

*

Operating is not guaranteed.

*

The radiation-resistance design is not carried out.

●

Operating conditions

Parameter

Symbol

Ratings

Unit

Supply voltage

VDD

2.7 ~ 3.6

V

Input H voltage

VINH

0.8VDD ~ VDD

V

Input L voltage

VINL

0.0 ~ 0.2VDD

V

Operating temperature

Topr

-5 ~ 75

℃

Output load

CL

15(MAX.)

pF

●

Electrical characteristics

○

BU7344HFV (Ta=25 ℃, VDD=3.3V, Crystal frequency=27.0000MHz, unless otherwise specified.)

Parameter

Symbol

Limits

Unit

Conditions

Min.

Typ.

Max.

Output H voltage

VOH

2.8

-

VDD

V

IOH = -3.0mA

Output L voltage

VOL

0.0

-

0.5

V

IOL = 3.0mA

Standby current

IDDst

-

-

1.0

μA

OE = L

Consumption current 1

IDD1

-

4.0

5.2

mA

40.5000MHz output

SEL = L

Consumption current 2

IDD2

-

3.5

4.6

mA

36.0000MHz output

SEL = H

Pull-down load

Rpd

50

100

200

kΩ

input PIN, pull-down load value

Output frequency

OUT1

CLK40.5

40.5000

MHz

IN*12/4/2, SEL = L

OUT2

CLK36

36.0000

MHz

IN*8/3/2, SEL = H

*

The output frequency is determined by the arithmetic (frequency division) expression of a frequency input to IN.

If the input frequency is set to 27.0000MHz, the output frequency will be as listed above.