LC87F74C8A

No.7825-11/21

Recommended Operating Range / Ta = -20°C to +70°C, VSS1 = VSS2 = VSS3 = 0V

Limits

Parameter

Symbol

Pins

Conditions

VDD [V]

min

typ

max

unit

VDD(1)

0.294

µs≤ tCYC≤200µs

4.5

5.5

Operating supply

voltage range

VDD(2)

VDD1 = VDD2 = VDD3

0.735

µs≤ tCYC≤200µs

3.0

5.5

Supply voltage

range in Hold

mode

VHD

VDD1

Keep RAM and register

data in HOLD mode.

2.0

5.5

VIH(1)

• Port 0, 3, 8

• Port A, B, C, D, E, F, L

Output disable

3.0 to 5.5

0.3VDD

+0.7

VDD

VIH(2)

• Port 1

• Port 71, 72, 73

• P70 port input/interrupt

Output disable

3.0 to 5.5

0.3VDD

+0.7

VDD

VIH(3)

P87 small signal input

Output disable

3.0 to 5.5

0.75VDD

VDD

VIH(4)

Port 70

Watchdog timer

Output disable

3.0 to 5.5

0.9VDD

VDD

Input high voltage

VIH(5)

XT1, XT2, CF1, RES

3.0 to 5.5

0.75VDD

VDD

VIL(1)

• Port 0, 3, 8

• Port A, B, C, D, E, F, L

Output disable

3.0 to 5.5

VSS

0.15VDD

+0.4

VIL(2)

• Port 1

• Port 71, 72, 73

• P70 port input/interrupt

Output disable

3.0 to 5.5

VSS

0.1VDD

+0.4

VIL(3)

Port 87 small signal

input

Output disable

3.0 to 5.5

VSS

0.25VDD

VIL(4)

Port 70

Watchdog timer

Output disable

3.0 to 5.5

VSS

0.8VDD

-1.0

Input low voltage

VIL(5)

XT1, XT2, CF1, RES

3.0 to 5.5

VSS

0.25VDD

V

4.5 to 5.5

0.294

200

Operation cycle

time

tCYC

3.0 to 5.5

0.735

200

µs

4.5 to 5.5

0.1

10

• CF2 open

• System clock divider :

1/1

• External clock

DUTY = 50 ± 5%

3.0 to 5.5

0.1

4

4.5 to 5.5

0.2

20

External system

clock frequency

FEXCF(1)

CF1

• CF2 open

• System clock divider :

1/2

3.0 to 5.5

0.2

8

FmCF(1)

CF1, CF2

10MHz ceramic resonator

oscillation

Refer to figure 1

4.5 to 5.5

10

FmCF(2)

CF1, CF2

4MHz ceramic resonator

oscillation

Refer to figure 1

3.0 to 5.5

4

FmRC

RC oscillation

3.0 to 5.5

0.3

1.0

2.0

FmMRC

Frequency variable RC

oscillation source

oscillation

3.0 to 5.5

50

MHz

Oscillation

frequency range

(Note 1)

FsX’tal

XT1, XT2

32.768kHz crystal

resonator oscillation

Refer to figure 2

3.0 to 5.5

32.768

kHz

Note 1 : The parts value of oscillation circuit is shown in table 1 and table 2.