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AS1123
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Switching Characteristics
V DD = 3.0 to 5.5V, V DS = 0.8V, V IH = V DD , V IL = GND, R EXT = 940 ? , V LOAD = 4.0V, R LOAD = 64 ? , C LOAD = 10pF; The Switching Charac-
teristics are guaranteed by design.
Table 4. Switching Characteristics for V DD = 5V
Symbol
t P1
t P2
t P3
Parameter
Propagation Delay Time
(Without Staggered Output Delay)
Conditions
CLK - SDO
LD - OUTN n
OEN - OUTN n
Min
Typ
5
250
250
Max
10
500
500
Unit
ns
ns
t P4
t W(CLK)
Propagation Delay Time
CLK
15
10
ns
t W(L)
t W(OE)
Pulse Width
LD
OEN (@I OUT < 40mA)
15
500
ns
t R
t F
*
*
CLK Rise Time
CLK Fall Time
500
500
ns
ns
t OR
t OF
t SU(D)
t H(D)
t SU(L)
t H(L)
t TESTING
t STAG
Output Rise Time of V OUT (Turn Off)
Output Fall Time of V OUT (Turn On)
Setup Time for SDI
Hold Time for SDI
Setup Time for LD
Hold Time for LD
OEN Time for Error Detection
Staggered Output Delay
(only for AS1123B)
5
5
5
5
2000
tbd
tbd
20
500
500
40
ns
ns
ns
ns
ns
ns
ns
ns
t SU(OE)
t GSW(ERROR)
t SU(ERROR)
t P(I/O)
t SW(ERROR)
f CLK
Output Enable Setup Time
Global Error Switching Setup Time
Global Error Detection Setup Time
Propagation Delay Global Error Flag
Switching Time Global Error Flag
Clock Frequency (Cascade Operation)
20
10
10
5
10
30
ns
ns
ns
ns
ns
MHz
t P3,ON
t P3,OFF
t REXT2,1
t REXT2,1
Low-Current Test Mode
Propagation Delay Time
External Resistor Reaction Time
External Resistor Reaction Time
Turn ON
Turn OFF
Change from R EXT1 = 470 ? , I OUT1 = 40mA to
R EXT2 = 4.7k ? , I OUT2 = 4mA
Change from R EXT1 = 4.7k ? , I OUT1 = 4mA to
R EXT2 = 470 ? , I OUT2 = 40mA
3
0.05
0.5
0.5
5
0.1
1
1
s
s
s
s
*
If multiple AS1123 devices are cascaded and t r or t f is large, it may be critical to achieve the timing required for data transfer between two cas-
caded LED drivers.
www.austriamicrosystems.com/LED-Driver-ICs
Revision 1.00
5 - 24
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