DS1554 Datasheet, PDF (13/21 Pages) Dallas Semiconductor – 256K NV Y2KC Timekeeping RAM

DS1554
WRITE CYCLE, AC CHARACTERISTICS
(0°C to 70°C; V_CC = 5.0V ±10%)
70 ns access 100 ns access
PARAMETER
SYMBOL ^{MIN MAX MIN MAX} UNITS NOTES
Write Cycle Time
t_WC
70
100
ns
Address Access Time
t_AS
0
0
ns
WE Pulse Width
t_WEW
50
70
ns
CE Pulse Width
t_CEW
60
75
ns
Data Setup Time
t_DS
30
40
ns
Data Hold time
t_DH1
0
0
ns
9
Data Hold time
t_DH2
X
X
ns
10
Address Hold Time
t_AH1
5
5
ns
9
Address Hold Time
t_AH2
X
X
ns
10
WE Data Off Time
t_WEZ
25
35
ns
Write Recovery Time
t_WR
5
5
ns
WRITE CYCLE, AC CHARACTERISTICS
(0°C to 70°C; V_CC = 3.3V ±10%)
120 ns access 150 ns access
PARAMETER
SYMBOL ^{MIN MAX MIN MAX} UNITS NOTES
Write Cycle Time
t_WC
120
150
ns
Address Setup Time
t_AS
0
0
ns
WE Pulse Width
t_WEW
100
130
ns
CE Pulse Width
t_CEW
110
140
ns
Data Setup Time
t_DS
80
90
ns
Data Hold Time
t_DH1
0
0
ns
9
Data Hold Time
t_DH2
X
X
ns
10
Address Hold Time
t_AH1
0
0
ns
9
Address Hold Time
t_AH2
X
X
ns
10
WE Data Off Time
t_WEZ
40
50
ns
Write Recovery Time
t_WR
10
10
ns
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