UPD4990AC データシートの表示（PDF） - NEC => Renesas Technology

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UPD4990AC

SERIAL I/O CALENDAR & CLOCK CMOS LSI

NEC => Renesas Technology 

µPD4990A

TIMING DIAGRAM FOR SETTING COMMANDS (C0', C1', C2', C3')

Figure 2.

DATA

IN

CLK

STB

VIH

VIH

C0'

C1'

C2'

C3'

VIL

VIL

tDSU

tDHLD

VIH

VIH

VIL

VIL

tHLD

VIH

VIL

tSTB

NEW COMMAND

VALID

Other than time read mode

OLD MODE

Time read mode

OLD MODE

td1

NEW MODE

td2

NEW MODE

VDD − VSS = 2.0 V

tDSU = 1 µs MIN.

tDHLD = 1 µs MIN.

tHLD = 1 µs MIN.

tSTB = 1 µs MIN.

td1 = 1 µs MAX. (Other than time read mode)

td2 = 20 µs MAX. (Time read mode)

Note: Command (C2, C1, C0) is set to (1, 1, 1)

CS = "H"

A mode is latched by STB and held until another mode in the same group is set.

11

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