M02097-11 Datasheet, PDF (8/21 Pages) M/A-COM Technology Solutions, Inc. – 3.3/5V LED Driver / Limiting Amplifier for Operation to 500 Mbps

Product Specification
1.5
Safety Logic Timing
V_CC = 3.05 to 3.55V or 4.7 to 5.5V, T_A = -40°C to +95°C, unless otherwise noted.
Typical values are V_CC = 3.3V, IPB_OUT = 4mA, I_MOD = 50mA.
Table 1-7. Safety Logic Timing
Symbol
Parameter
Conditions
Minimum Typical Maximum Units
t_off DIS assert time
Rising edge of DIS to fall of output signal below
–
10% of nominal ⁽¹⁾
t_on DIS negate time
Falling edge of DIS to rise of output signal above
–
90% of nominal ⁽¹⁾
t_init Time to initialize
Includes reset of FAIL; from power on after
–
Supply_OK or from negation of DIS during reset
of FAIL condition
t_wc Window comparator hold-off Time during which the status of the fault detect
2
time
comparators is ignored.
t_fault LED fault time -- from fault
From occurrence of fault condition or when
–
condition to assertion of FAIL Supply_OK is beyond specified range
t_reset DIS time to start reset
DIS pulse width required to initialize safety
–
circuitry or reset a latched fault
t_VCC__OK Supply okay delay time
Delay between supply_OK condition and when
–
outputs are enabled
NOTE:
1. With C_PB = 47 nF.
1
10
µs
0.4
1
ms
4
300
ms
3
–
ms
16
100
µs
–
10
µs
900
–
µs
Figure 1-1. Safety Logic Simplified Block Diagram
DIS
Fault _OK
V cc 3_OK
Vcc_OK
3 .3V _ONLY
~2V +
TCSLOPE
-
~900 µs typical
Activate_Config_Settings
Fault _OK
Configuration settings are not updated while TC_SLOPEis
~3 ms typical
pulled high, but are updated when TC_SLOPE is at normal level
* Fault_OK indicates that no fault is detected at any of the fault sense nodes
S Q ^SET
R Q CLR
SCB
Output _Enable
Normal
SCB
Normal
FAIL
02097-DSH-001-C
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