CAT4008 Datasheet, PDF (4/14 Pages) Catalyst Semiconductor – 8-Channel Constant Current LED Driver

CAT4008
TIMING CHARACTERISTICS
For 3.0V ≤ V_DD ≤ 5.5V, T_AMB = 25 ºC, unless specified otherwise.
Symbol
CLK
f_clk
t_cwh
t_cwl
SIN
t_ssu
t_sh
LATCH
t_lwh
T_lh
T_lsu
LEDn
t_ld
t_ls
t_lst
t_bd
t_lr
t_lf
SOUT
t_or
t_of
t_od
Name
CLK Clock Frequency
CLK Pulse Width High
CLK Pulse Width Low
Setup time SIN to CLK
Hold time SIN to CLK
LATCH Pulse width
Hold time LATCH to CLK
Setup time LATCH to CLK
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%)
SOUT rise time (10% to 90%)
SOUT fall time (90% to 10%)
Propagation delay time SOUT
Conditions
Channel Stagger Delay
LATCH to LED1 off/on
LED(n) to LED(n+1)
LED1 to LED8
BLANK to LED(n) off/on
Pull-up resistor = 50Ω to 3.0V
Pull-up resistor = 50Ω to 3.0V
C_L = 15pF
C_L = 15pF
CLK to SOUT
Min⁽¹⁾ Typ⁽²⁾ Max⁽¹⁾ Units
25
MHz
20
ns
20
ns
4
ns
4
ns
20
ns
4
ns
400
ns
40
300
ns
17
40
ns
120
ns
60
300
ns
40
200
ns
30
250
ns
5
ns
5
ns
8
15
25
ns
TEST CIRCUIT FOR AC CHARACTERISTICS
VDD
1µF
VDD
BLANK
LATCH
CAT4008
SIN
CLK
RSET
GND
RSET
LED1
LED8
SOUT
Rp
50Ω
Rp
50Ω
V1
Cl
3V
15pF
Notes:
(1) All min and max values are guaranteed by design.
(2) V_DD = 5V, LED current 30mA.
Doc. No. MD-5034 Rev. A
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice