CXP87452 datasheet(17/32 Pages) SONY

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CXP87452/87460

∗ tsys indicates three values according to the contents of the clock control register (address; 00FE

) upper 2

bits (CPU clock selection).

tsys [ns] = 2000/fc (Upper 2 bits = "00"), 4000/fc (Upper 2 bits = "01"), 16000/fc (Upper 2 bits = "11")

XTAL

tXH

tXL

tCF

tCR

0.4V

VDD – 0.4V

1/fc

EXTAL

Crystal oscillation

Ceramic oscillation

EXTAL

XTAL

External clock

EXTAL

XTAL

74HC04

AC Characteristics

(1) Clock timing

System clock frequency

System clock input pulse

width

System clock input

rising and falling times

Event count clock input

pulse width

Event count clock input

rising and falling times

tXL,

tXH

tCR,

tCF

tEL,

tEH

tER,

tEF

XTAL

EXTAL

XTAL

EXTAL

XTAL

EXTAL

PE1/EC

MHz

Item

Symbol

Condition

Unit

Fig. 1,

Fig. 2

Fig. 1,

Fig. 2 (External clock drive)

Fig. 1, Fig. 2

(External clock drive)

Fig. 3

Min.

37.5

tsys

× 4∗

Max.

200

(Ta = –20 to +75°C, VDD = 3.0 to 5.5V, Vss = 0V)

Fig. 1. Clock timing

VDD = 4.5 to 5.5V

Fig. 2. Clock applied condition

tEH

tEL

tEF

tER

0.2VDD

0.8VDD

Fig. 3. Event count clock timing

CXP87452 Datasheet(PDF) 17 Page - Sony Corporation

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