PD780 datasheet(7/24 Pages) NEC

7 / 24 page

fttfEC

AC Characteristics (cont)

TA =

DOC to +70°C; Vcc

+ 5 V ± 5%; unless otherwise specified

�PD7'O (2.5 MHzI

Parameter

Symbol

Min

Max

RFSH delay from rising edge of clock to RFSH low

tOL(RF)

180

RFSH delay from rising edge of clock to RFSH high

tOH(RF)

150

WAIT setup time to falling edge of clock

tS(wr)

WR delay from rising edge of clock to WR low

t OL.,(WR)

WR delay from falling edge of clock WR low

tOl+(WR)

WR delay from falling edge of clock to WR high

100

Pulse width to

WR low

tW(WRL)

(13)

Notes:

(1 ) tc = tw(tH) + tw(,L) + tR

+ tF

(2) Though the structure of the 780 is static, 2OO�s is guaranteed maximum.

(3) tACM = t

w(tH) + tF

65 (75)' (50)"

(4) tACI = te - 70 (80)" (55)"

(5) ICA = tw(,L)

+ tR

50 (40)* (501'*

(6) ICAF = twitL)

+ tR

(60)' (40)"'

(7) tOCM = tc - 170 (210)' (140)*'

(8) tOCI

tw{,L)

+ tR

170 (210)' (140)"

(9) tCOF

ltL) + tR

70 (80)* (55)*'

(10) tMR

2tc

+ 'witH) + tF

65 (80)' (50)"

(11) tw(MRL)

tc - 30 (40)' (30)*'

(12) Iw(MRH)

twitH) + IF

20 (30)' (20)"

(13) tw(WR)

tc - 30 (40)* (30)*'

, These values apply to the flPD780.

" These values apply to the flPD780-2.

Load Circuit for Output

FromOutput

"..,,-, .. 10K 2.2K

83-OOO884A

�PD780

Umlls

�PD71O·1(4 MHzl

�PD78.2 (6 MHz)

Test

Min

Max

Min

Max

Unit

Conditions

130

110

120

100

(13 )

4-9

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