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AS1123B bảng dữ liệu(PDF) 6 Page - ams AG

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AS1123B bảng dữ liệu(HTML) 6 Page - ams AG

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www.austriamicrosystems.com/LED-Driver-ICs
Revision 1.00
5 - 24
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
VDD = 3.0 to 5.5V, VDS = 0.8V, VIH = VDD, VIL = GND, REXT = 940
Ω, VLOAD = 4.0V, RLOAD = 64Ω, CLOAD = 10pF; The Switching Charac-
teristics are guaranteed by design.
*
If multiple AS1123 devices are cascaded and tr or tf is large, it may be critical to achieve the timing required for data transfer between two cas-
caded LED drivers.
Table 4. Switching Characteristics for VDD = 5V
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
tP1
Propagation Delay Time
(Without Staggered Output Delay)
CLK - SDO
5
10
ns
tP2
LD - OUTNn
250
500
ns
tP3
OEN - OUTNn
250
500
tP4
Propagation Delay Time
10
ns
tW(CLK)
Pulse Width
CLK
15
ns
tW(L)
LD
15
tW(OE)
OEN (@IOUT < 40mA)
500
tR
*
CLK Rise Time
500
ns
tF
*
CLK Fall Time
500
ns
tOR
Output Rise Time of VOUT (Turn Off)
tbd
500
ns
tOF
Output Fall Time of VOUT (Turn On)
tbd
500
ns
tSU(D)
Setup Time for SDI
5
ns
tH(D)
Hold Time for SDI
5
ns
tSU(L)
Setup Time for LD
5
ns
tH(L)
Hold Time for LD
5
ns
tTESTING
OEN Time for Error Detection
2000
ns
tSTAG
Staggered Output Delay
(only for AS1123B)
20
40
ns
tSU(OE)
Output Enable Setup Time
20
ns
tGSW(ERROR)
Global Error Switching Setup Time
10
ns
tSU(ERROR)
Global Error Detection Setup Time
10
ns
tP(I/O)
Propagation Delay Global Error Flag
5
ns
tSW(ERROR)
Switching Time Global Error Flag
10
ns
fCLK
Clock Frequency (Cascade Operation)
30
MHz
tP3,ON
Low-Current Test Mode
Propagation Delay Time
Turn ON
3
5
s
tP3,OFF
Turn OFF
0.05
0.1
s
tREXT2,1
External Resistor Reaction Time
Change from REXT1 = 470
Ω, IOUT1 = 40mA to
REXT2 = 4.7k
Ω, IOUT2 = 4mA
0.5
1
s
tREXT2,1
External Resistor Reaction Time
Change from REXT1 = 4.7k
Ω, IOUT1 = 4mA to
REXT2 = 470
Ω, IOUT2 = 40mA
0.5
1
s



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