Rainbow-electronics T89C51CC01 Manual de usuario descargar pdf (Pagina 139)

139

T89C51CC01

Rev. D – 17-Dec-01

19.4.4 External Data Memory

Characteristics

Table 98. Symbol Description

Table 99. AC Parameters for a Variable Clock (F=40MHz)

Symbol Parameter

RLRH

RD Pulse Width

WLWH

WR Pulse Width

RLDV

RD to Valid Data In

RHDX

Data Hold After RD

RHDZ

Data Float After RD

LLDV

ALE to Valid Data In

AVD V

Address to Valid Data In

LLWL

ALE to WR or RD

AVWL

Address to WR or RD

QVWX

DataValidtoWRTransition

QVWH

Data set-up to WR High

WHQX

Data Hold After WR

RLAZ

RD Low to Address Float

WHLH

RD or WR High to ALE high

Symbol

Min Max

Units

RLRH

130 ns

WLWH

130 ns

RLDV

100 ns

RHDX

0ns

RHDZ

30 ns

LLDV

160 ns

AVDV

165 ns

LLWL

50 100 ns

AVWL

75 ns

QVWX

10 ns

QVWH

160 ns

WHQX

15 ns

RLAZ

0ns

WHLH

10 40 ns

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 148 149

T89C51CC01 1

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