
DS2251T
17 of 22
AC CHARACTERISTICS—PARALLEL PROGRAM LOAD TIMING
(VCC = 5V ±10%, TA = 0C to +70C.)
#
PARAMETER
SYMBOL
MIN
MAX
UNITS
41 Pulse Width of PE 3-4
tCEPW
4tCLK - 35
ns
45 Byte-wide Address Hold after
PE
3-4 High
During MOVX
tCEHDA
4tCLK - 30
ns
46 Delay from Byte-wide Address Valid
PE
3-4
Low During MOVX
tCELDA
4tCLK - 35
ns
47 Byte-wide Data Setup to
PE
3-4 High During
MOVX (read)
tDACEH
1tCLK + 40
ns
48 Byte-wide Data Hold after
PE
3-4 High
During MOVX (read)
tCEHDV
10
ns
49 Byte-wide Address Valid to R/
W
Active
During MOVX (write)
tAVRWL
3tCLK - 35
ns
50 Delay from R/
W
Low to Valid Data Out
During MOVX (write)
tRWLDV
20
ns
51 Valid Data Out Hold Time from PE 3-4 High
tCEHDV
1tCLK - 15
ns
52 Valid Data Out Hold Time from R/ W High
tRWHDV
0
ns
53 Write Pulse Width (R/ W Low Time)
tRWLPW
6tCLK - 20
ns
BYTE-WIDE BUS TIMING