GS2972 Datasheet, PDF (90/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

Table 4-33: GSPI AC Characteristics
Parameter
Symbol
Conditions
Min
Typ Max Units
CS low before SCLK rising
edge
t₀
1.5
−
−
ns
SCLK period
t₁
12.5
−
−
ns
SCLK duty cycle
t₂
40
50
60
%
Input data setup time
t₃
1.5
−
−
ns
PCLK
(MHz)
ns
Time between end of
Command Word (or data in
Auto-Increment mode) and
t₄
the first SCLK of the following
Data Word – write cycle.
unlocked
445
13.5
74.2
−
−
ns
27.0
37.1
74.25
13.5
148.5
6.7
Time between end of
Command Word (or data in
Auto-Increment mode) and
t₅
the first SCLK of the following
Data Word – read cycle.
50% levels; +3.3V or
+1.8V operation
PCLK
(MHz)
unlocked
ns
1187
13.5
297
−
−
ns
27.0
148.5
74.25
53.9
148.5
27
Output hold time (15pF load)
t₆
1.5
−
−
ns
PCLK
(MHz)
ns
unlocked
445
CS HIGH after last SCLK rising
edge
t₇
74.2
37.10
74.2
−
−
ns
37.1
74.25
13.5
148.5
6.7
Input data hold time
t₈
1.5
−
−
ns
Note: If the application interface performs a Read or Write access after power-up, prior to the application of a valid serial video input
signal, the SCLK frequency must not exceed 10MHz.
GS2972 3G/HD/SD-SDI Serializer with Complete
SMPTE Audio & Video Support
Final Data Sheet Rev. 9
GENDOC-047479 September 2013
www.semtech.com
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