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DATAVALID DATAVALID
R/W
CS
DATA
t
1
t
2
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
TIMING REQUIREMENTS: 2.5 V to 4.5 V
TIMING REQUIREMENTS: 4.5 V to 5.5 V
DAC7821
SBAS365B – OCTOBER 2005 – REVISED JULY 2007
TIMING INFORMATION
At t
r
= t
f
= 1ns (10% to 90% of V
DD
) and timed from a voltage level of (V
IL
+ V
IH
)/2; V
DD
= +2.5V to +4.5V, V
REF
= +10V,
I
OUT
2 = 0V. All specifications –40 ° C to +125 ° C, unless otherwise noted.
DAC7821
PARAMETER
(1)
TEST CONDITIONS MIN TYP MAX UNIT
t
1
R/ W to CS setup time 0 ns
t
2
R/ W to CS hold time 0 ns
t
3
CS low time (write cycle) 10 ns
t
4
Data setup time 6 ns
t
5
Data hold time 0 ns
t
6
R/ W high to CS low 5 ns
t
7
CS min high time 9 ns
t
8
Data access time 20 40 ns
t
9
Bus relinquish time 5 10 ns
(1) Ensured by design; not production tested.
At t
r
= t
f
= 1ns (10% to 90% of V
DD
) and timed from a voltage level of (V
IL
+ V
IH
)/2; V
DD
= +4.5V to +5.5V, V
REF
= +10V,
I
OUT
2 = 0V. All specifications –40 ° C to +125 ° C, unless otherwise noted.
DAC7821
PARAMETER
(1)
TEST CONDITIONS MIN TYP MAX UNIT
t
1
R/ W to CS setup time 0 ns
t
2
R/ W to CS hold time 0 ns
t
3
CS low time (write cycle) 10 ns
t
4
Data setup time 6 ns
t
5
Data hold time 0 ns
t
6
R/ W high to CS low 5 ns
t
7
CS min high time 7 ns
t
8
Data access time 10 20 ns
t
9
Bus relinquish time 5 10 ns
(1) Ensured by design; not production tested.
4
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