NXP Semiconductors
PCA9922
8-channel constant current LED driver with output error detection
13. Dynamic characteristics
Table 10.
Dynamic characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
t w(LE)
LE pulse width
V DD = 3.3 V
[1]
10
-
-
ns
t w(OE)
t su(SDI)
t h(SDI)
f CLK
OE pulse width
SDI set-up time
SDI hold time
frequency on pin CLK
from SDI to CLK
from CLK to SDI
[2]
200
5
5
0
-
-
-
-
-
-
-
25
ns
ns
ns
MHz
δ
clock duty cycle
-
50 to 50 60 to 40 %
t w(CLKH)
t w(CLKL)
t PD(CLK-SDO)
CLK HIGH pulse width
CLK LOW pulse width
propagation delay
16
16
-
-
-
-
-
-
10
ns
ns
ns
from CLK to SDO
t su(LE)
t su(OE)
t h(LE)
t h(OE)
t PD(OE-LEDH)
t PD(OE-LEDL)
t PD(LEH-LEDH)
LE set-up time
OE set-up time
LE hold time
OE hold time
propagation delay
from OE to LED HIGH
propagation delay
from OE to LED LOW
propagation delay
from LE HIGH to LED HIGH
from LE to CLK
from OE to CLK
from CLK to LE
from CLK to OE
pins LED0 to LED7; V DD = 5.0 V;
C L = 30 pF; R L = 15 Ω ; V L = 1.9 V;
I O = 20.7 mA; R ext = 910 Ω
pins LED0 to LED7; V DD = 5.0 V;
C L = 30 pF; R L = 15 Ω ; V L = 1.9 V;
I O = 20.7 mA; R ext = 910 Ω
pins LED0 to LED7; V DD = 5.0 V;
C L = 30 pF; R L = 15 Ω ; V L = 1.9 V;
I O = 20.7 mA; R ext = 910 Ω ;
[3]
[3]
[3]
[3]
20
20
5
5
-
-
-
-
-
-
-
210
210
210
-
-
-
-
-
-
-
ns
ns
ns
ns
ns
ns
ns
OE = logic 0
t PD(LEH-LEDL)
propagation delay
from LE HIGH to LED LOW
pins LED0 to LED7; V DD = 5.0 V;
C L = 30 pF; R L = 15 Ω ; V L = 1.9 V;
I O = 20.7 mA; R ext = 910 Ω ;
-
210
-
ns
OE = logic 0
t PD(CLKH-LEDH)
propagation delay pins LED0 to LED7; V DD = 5.0 V;
from CLK HIGH to LED HIGH C L = 30 pF; R L = 15 Ω ; V L = 1.9 V;
I O = 20.7 mA; R ext = 910 Ω ;
-
210
-
ns
OE = logic 0; LE = logic 1
t PD(CLKH-LEDL)
propagation delay pins LED0 to LED7; V DD = 5.0 V;
from CLK HIGH to LED LOW C L = 30 pF; R L = 15 Ω ; V L = 1.9 V;
I O = 20.7 mA; R ext = 910 Ω ;
-
210
-
ns
OE = logic 0; LE = logic 1
t r
t f
rise time
fall time
pins LED0 to LED7; V DD = 5.0 V;
C L = 30 pF; R L = 15 Ω ; V L = 1.9 V;
I O = 20.7 mA; R ext = 910 Ω
pins LED0 to LED7; V DD = 5.0 V;
C L = 30 pF; R L = 15 Ω ; V L = 1.9 V;
I O = 20.7 mA; R ext = 910 Ω ;
-
-
175
190
-
-
ns
ns
OE = logic 0
[1]
Applies to normal device operation. This pulse width does not apply to active HIGH times for executing error detect sequences.
PCA9922
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 6 April 2011
? NXP B.V. 2011. All rights reserved.
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