M02094 Datasheet, PDF (8/44 Pages) M/A-COM Technology Solutions, Inc. – 3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 2 Gbps

M02094 Data Sheet
Table 1-5. Safety Logic Timing
Symbol
Parameter
Conditions
t_init
Time to initialize⁽²⁾
Includes reset of FAIL; from power on after
Supply_OK or from negation of DIS during
reset of FAIL condition
t_fault
Laser fault time - from fault condition From occurrence of fault condition or when
to assertion of FAIL
Supply_OK is beyond specified range
t_reset
DIS time to start reset
DIS or ENA pulse width required to initialize
safety circuitry or reset a latched fault
t_on_BM
DIS negate (turn-on) time during
burst-mode operation
Using integrated switch at SVCC (3.3V
operation) ⁽⁴⁾
t_off_BM
DIS assert (turn-off) time during
burst-mode operation
Using integrated switch at SVCC (3.3V
operation)⁽⁴⁾
Notes:
1. With CAPC = 2.2nF
2. User-adjustable. Specifications reflect timing with no external RESET capacitor.
3. With < 1nF capacitor from RESET pin to ground.
4. Imod > 12mA
Min. Typ. Max. Units.
2
3
5
ms
100
µs
10⁽³⁾
µs
300 500
ns
200 500
ns
Figure 1-1. Safety Logic Timing Characteristics
Hot Plug (DIS Low)
V_CC3
and
V_CC5
status
FAIL
V_CC3 and V_CC5
“OK”
(low)
DIS
LASER
OUTPUT
(low)
t_on < 1ms,
(300 us typ.)
Slow Rise on Vcc=3.3V at Power-up (DIS Low)
3.3V
V_CC
V_CC3
FAIL
3.3V
FAIL state at power-up will
depend on pull-up voltage
(low)
DIS
LASER
OUTPUT
(low)
t_on < 1ms,
(300 us typ.)
8
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