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
= 940Ω, V
LOAD
= 4.0V, R
LOAD
= 64Ω, 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
t
P4
t
W(CLK)
t
W(L)
t
W(OE)
t
R
*
*
Parameter
Propagation Delay Time
(Without Staggered Output Delay)
Propagation Delay Time
Pulse Width
CLK Rise Time
CLK Fall Time
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)
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)
Low-Current Test Mode
Propagation Delay Time
OEN (@I
OUT
< 40mA)
t
SU(D)
t
H(D)
t
SU(L)
t
H(L)
t
STAG
t
TESTING
hn
ic a
al m
co s
A
nt G
en
ts
til
5
5
5
5
2000
20
20
10
10
External Resistor Reaction Time
External Resistor Reaction Time
Turn ON
Turn OFF
Change from R
EXT1
= 470Ω, I
OUT1
= 40mA to
R
EXT2
= 4.7kΩ, I
OUT2
= 4mA
Change from R
EXT1
= 4.7kΩ, I
OUT1
= 4mA to
R
EXT2
= 470Ω, I
OUT2
= 40mA
3
0.05
0.5
0.5
Revision 1.00
t
F
t
OR
t
OF
t
SU(OE)
t
GSW(ERROR)
t
SU(ERROR)
t
P(I/O)
t
SW(ERROR)
f
CLK
t
P3,ON
t
P3,OFF
t
REXT2,1
t
REXT2,1
*
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.
Te
c
lv
500
500
tbd
tbd
500
500
40
5
10
30
5
0.1
1
1
al
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MHz
s
s
s
s
5 - 24
CLK
LD
15
15
500
id
ns
Conditions
CLK - SDO
LD - OUTNn
OEN - OUTNn
Min
Typ
5
250
250
Max
10
500
500
10
Unit
ns
ns
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