AS1520/AS1521
Data Sheet - Electrical Characteristics
Table 6. AS1521 Timing Characteristics – (Figures 3, 4, 21, 23; VDD1 = VDD2 = VDD3 = +2.7 to +3.6V; TAMB = TMIN to
TMAX (unless otherwise specified). (Continued)
Symbol
tDOH
tSTH
Parameter
Conditions
CLOAD = 20pF
CLOAD = 20pF
CLOAD = 20pF
CLOAD = 20pF
CLOAD = 20pF
CLOAD = 20pF
CLOAD = 20pF
CLOAD = 20pF
Min
13
Typ
20
Max
Units
ns
SCLK Rise to DOUT Hold
SCLK Rise to SSTRB Hold
SCLK Rise to DOUT Valid
SCLK Rise to SSTRB Valid
CSN Rise to DOUT Disable
CSN Rise to SSTRB Disable
CSN Fall to DOUT Enable
CSN Fall to SSTRB Enable
CSN Pulse Width High
13
20
ns
tDOV
tSTV
100
100
85
ns
ns
tDOD
tSTD
13
13
ns
85
ns
tDOE
tSTE
85
ns
85
ns
tCSW
100
ns
Figure 3. DOUT Enable-Time Load Circuits
VDD2
DOUT
6kΩ
CLOAD
20pF
6kΩ
DOUT
CLOAD
20pF
DGND
GND
High-impedance to VOH and VOL to VOH
DGND
High-impedance to VOL and VOH to VOL
Figure 4. DOUT Disable-Time Load Circuits
VDD2
DOUT
6kΩ
CLOAD
20pF
6kΩ
DOUT
CLOAD
20pF
DGND
VOH to high-impedance
GND
DGND
VOL to high-impedance
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