LC87F0A08A

No.A1535-11/24

Allowable Operating Conditions at Ta = -40

C to +85C, VSS1 = VSS2 = 0V

Parameter

Symbol

Pin/Remarks

Conditions

Specification

VDD[V]

min

typ

max

unit

Operating supply

voltage

(Note 2-1)

VDD(1)

VDD1=VDD2

0.367

s  tCYC  200s

2.5

5.5

V

VDD(2)

0.735

s  tCYC  200s

2.5

5.5

Memory sustaining

supply voltage

VHD

VDD1=VDD2

RAM and register contents

sustained in HOLD mode

2.0

High level

input voltage

VIH(1)

Ports 0, 1, 2, 3

P70

2.5 to 5.5

0.3VDD

+0.7

VDD

VIH(4)

CF1, RES

2.5 to 5.5

0.75VDD

VDD

Low level

input voltage

VIL(1)

Ports 1, 2, 3

P70

4.0 to 5.5

VSS

0.1VDD

+0.4

2.5 to 4.0

VSS

0.2VDD

VIL(4)

CF1, RES

2.5 to 5.5

VSS

0.25VDD

Instruction cycle

time

(Note 2-1)

tCYC

(Note 2-2)

2.7 to 5.5

0.245

200

s

2.5 to 5.5

0.367

200

2.5 to 5.5

0.735

200

External system

clock frequency

FEXCF

CF1

 CF2 pin open

 System clock frequency

division ratio=1/1

 External system clock

duty=50

5%

2.7 to 5.5

0.1

12

MHz

2.5 to 5.5

0.1

8

Oscillation

frequency range

(Note 2-3)

FmCF(1)

CF1, CF2

8MHz ceramic oscillation

See Fig. 1.

2.5 to 5.5

8

MHz

FmCF(2)

CF1, CF2

4MHz ceramic oscillation

See Fig. 1.

2.5 to 5.5

4

FmMRC

1/2 of high-speed RC

oscillation frequency

(RCCTD=0)

(Note 2-4)

2.5 to 5.5

7.44

8.0

8.56

FmRC

Internal medium-speed RC

oscillation

2.5 to 5.5

0.5

1.0

2.0

FmSRC

Internal low-speed RC

oscillation

2.5 to 5.5

15

30

60

kHz

FsX’tal

XT1, XT2

32.768kHz crystal oscillation

See Fig. 2.

2.5 to 5.5

32.768

Note 2-1: VDD must be held greater than or equal to 2.7V in the flash ROM onboard programming mode.

Note 2-2: Relationship between tCYC and oscillation frequency is 3/FmCF at a division ratio of 1/1 and 6/FmCF at

a division ratio of 1/2.

Note 2-3: See Tables 1 and 2 for the oscillation constants.

Note 2-4: An oscillation stabilization time of 100

s or longer must be provided before switching the system clock

source after the state of the high-speed RC oscillation circuit is switched from “oscillation stopped” to

“oscillation enabled” .