ST7577

Ver 1.0a

39/48

2008/02/14

System Bus Read/Write Characteristics (For the 6800 Series MPU)

Rating

Item

Signal

Symbol

Condition

Min.

Typ.

Max.

Units

Address setup time

45

Address hold time

A0

10

System cycle time

130

Enable L pulse width (WRITE)

50

Enable H pulse width (WRITE)

E/RD

80

Enable L pulse width (READ)

245

Enable H pulse width (READ)

E/RD

40

WRITE Data setup time

45

WRITE Data hold time

45

READ access time

15

245

READ output disable time

D0 ~ D7

45

ns

*1 The input signal rise time and fall time (tr, tf) is specified at 15 ns or less. When the system cycle time is extremely fast,

(tr +tf) ≦ (tCYC6

– tEWLW – tEWHW) for (tr + tf) ≦ (tCYC6 – tEWLR – tEWHR) are specified.

*3 tEWLW and tEWLR are specified as the overlap between CSB being

“L” and E.