9

Notes:

1. For information on part-to-part delay through DPRAM cells from writing port to reading port, refer to Read Timing with Port-to-Port Delay waveform (see figure 3c).

SYMBOL

PARAMETER

7C138 - 45

7C139 - 45

MIN

MAX

7C138 - 55

7C139 - 55

MIN

MAX

UNIT

Write cycle time

45

55

ns

t

SCE

CE LOW to write end

40

50

ns

Address set-up to write end

40

50

ns

Address hold from write end

0

0

ns

Address set-up to write start

0

0

ns

t

PWE

Write pulse width

40

50

ns

Data set-up to write end

40

50

ns

Data hold from write end

0

0

ns

R/W LOW to high Z

20

20

ns

t

LZWE

R/W HIGH to low Z

0

0

ns

Write pulse to data delay

95

105

ns

Write data valid to read data valid

95

105

ns

Write disable time

5

5

ns