MAX1576 Datasheet, PDF (4/22 Pages) Maxim Integrated Products – 480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash

AC ELECTRICAL CHARACTERISTICS (TJ = – 40° to 130°C*, CL = 50 pF, Input tr = tf = 10 ns)
Symbol
fclk
tPLH,
tPHL
Parameter
Serial Data Clock Frequency, Single Device or Cascaded Devices
NOTE: Refer to Clock tw below
(Figure 1)
Maximum Propagation Delay, Clock to Data Out
(Figures 1 and 5)
tTLH,
tTHL
Maximum Output Transistion Time, Data Out
(Figures 1 and 5)
fR
Refresh Rate — Bank 1 through Bank 5
(Figures 2 and 6)
Cin
Maximum Input Capacitance — Data In, Clock, Enable
* See Thermal Considerations section.
VDD
V
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
—
Guaranteed
Limit
dc to 3.0
dc to 4.0
dc to 4.0
140
80
80
70
50
50
NA
700 to 1900
700 to 1900
10
Unit
MHz
ns
ns
Hz
pF
TIMING REQUIREMENTS (TJ = – 40° to 130°C*, Input tr = tf = 10 ns unless otherwise indicated)
Symbol
Parameter
VDD
V
Guaranteed
Limit
Unit
tsu, th
Minimum Setup and Hold Times, Data In versus Clock
(Figure 3)
3.0
50
ns
4.5
40
5.5
40
tsu, th,
trec
Minimum Setup, Hold, ** and Recovery Times, Enable versus Clock
(Figure 4)
3.0
150
ns
4.5
100
5.5
100
tw(L)
Minimum Active–Low Pulse Width, Enable
(Figure 4)
3.0
4.5
µs
4.5
3.4
5.5
3.4
tw(H)
Minimum Inactive–High Pulse Width, Enable
(Figure 4)
3.0
300
ns
4.5
150
5.5
150
tw
Minimum Pulse Width, Clock
(Figure 1)
3.0
167
ns
4.5
125
5.5
125
tr, tf
Maximum Input Rise and Fall Times — Data In, Clock, Enable
(Figure 1)
3.0
1
ms
4.5
1
5.5
1
* See Thermal Considerations section.
** For a high–speed 8–Clock access, th for Enable is determined as follows:
VDD = 3 to 4.5 V, fclk > 1.78 MHz: th = 4350 – (7500/fclk)
VDD = 4.5 to 5.5 Vc, _lfk > 2.34 MHz: th = 3300 – (7500/fclk)
where th is in ns and fclk is in MHz.
NOTES:
1. This restriction does NOT apply for fclk rates less than those listed above. For “slow” fclk rates, use the th limits in the above table.
2. This restriction does NOT apply for an access involving more than 8 Clocks. For > 8 Clocks, use the th limits in the above table.
MC14489B
4
MOTOROLA