CAT4008 Datasheet, PDF (4/13 Pages) Catalyst Semiconductor – 8-Channel Constant Current LED Driver

CAT4008
Table 4. TIMING CHARACTERISTICS
(For 3.0 V ≤ V_DD ≤ 5.5 V, T_AMB = 25°C, unless specified otherwise.)
Symbol
Name
Conditions
CLK
f_clk
t_cwh
t_cwl
SIN
CLK Clock Frequency
CLK Pulse Width High
CLK Pulse Width Low
t_ssu
t_sh
LATCH
Setup time SIN to CLK
Hold time SIN to CLK
t_lwh
T_lh
T_lsu
LEDn
LATCH Pulse width
Hold time LATCH to CLK
Setup time LATCH to CLK
Channel Stagger Delay
t_ld
t_ls
t_lst
t_bd
t_lr
t_lf
SOUT
LED1 Propagation delay
LED Propagation delay stagger
LED Propagation delay stagger total
BLANK Propagation delay
LED rise time (10% to 90%)
LED fall time (90% to 10%)
LATCH to LED1 off/on
LED(n) to LED(n+1)
LED1 to LED8
BLANK to LED(n) off/on
Pull−up resistor = 50 W to 3.0 V
Pull−up resistor = 50 W to 3.0 V
t_or
SOUT rise time (10% to 90%)
C_L = 15 pF
t_of
SOUT fall time (90% to 10%)
C_L = 15 pF
t_od
Propagation delay time SOUT
CLK to SOUT
1. All min and max values are guaranteed by design.
2. V_DD = 5 V, LED current 30 mA.
Min
(Note 1)
20
20
4
4
20
4
400
8
Typ
(Note 2)
Max
(Note 1)
Units
25
MHz
ns
ns
ns
ns
ns
ns
ns
40
300
ns
17
40
ns
120
ns
60
300
ns
40
200
ns
30
250
ns
5
ns
5
ns
15
25
ns
VDD
1 mF
VDD
BLANK
LATCH
SIN
CLK
RSET
CAT4008
GND
RSET
Rp
50 W
LED1
LED8
SOUT
Rp
50 W
V1
Cl
3V
15 pF
Figure 2. Test Circuit for AC Characteristics
http://onsemi.com
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