AFBR-57J9AMZ Datasheet, PDF (11/17 Pages) AVAGO TECHNOLOGIES LIMITED – RoHS OBSAI/CPRI Compatible Optical Transceiver

Table 9. Transceiver SOFT DIAGNOSTIC Timing Characteristics
(T_C = -10°C to 85°C, VccT, VccR = 3.3 V ±10%)
Parameter
Hardware TX_DISABLE Assert Time
Hardware TX_DISABLE Negate Time
Time to initialize, including reset of TX_FAULT
Hardware TX_FAULT Assert Time
Hardware TX_DISABLE to Reset
Symbol
t_off
t_on
t_init
t_fault
t_reset
Minimum Maximum Unit
10
µs
1
ms
300
ms
1
ms
10
µs
Notes
Note 1
Note 2
Note 3
Note 4
Note 5
Hardware RX_LOS Deassert Time
t_loss_on
100
µs
Note 6
Hardware RX_LOS Assert Time
t_loss_off
100
µs
Note 7
Software TX_DISABLE Assert Time
Software TX_DISABLE Negate Time
Software Tx_FAULT Assert Time
Software Rx_LOS Assert Time
Software Rx_LOS Deassert Time
Analog parameter data ready
t_off_soft
t_on_soft
t_fault_soft
t_loss_on_soft
t_loss_off_soft
t_data
100
100
100
100
100
1000
ms
Note 8
ms
Note 9
ms
Note 10
ms
Note 11
ms
Note 12
ms
Note 13
Serial bus hardware ready
t_serial
300
ms
Note 14
Serial bus buffer time
t_buf
20
µs
Note 16
Write Cycle Time
t_write
80
ms
Note 15
Serial ID Clock Rate
f_serial_clock
400
kHz
Note 17
Notes:
1. Time from rising edge of TX_DISABLE to when the optical output falls below 10% of nominal.
2. Time from falling edge of TX_DISABLE to when the modulated optical output rises above 90% of nominal.
3. Time from power on or falling edge of Tx_Disable to when the modulated optical output rises above 90% of nominal.
4. From power on or negation of TX_FAULT using TX_DISABLE.
5. Time TX_DISABLE must be held high to reset the laser fault shutdown circuitry.
6. Time from loss of optical signal to Rx_LOS Assertion.
7. Time from valid optical signal to Rx_LOS De-Assertion.
8. Time from two-wire interface assertion of TX_DISABLE (A2h, byte 110, bit 6) to when the optical output falls below 10% of nominal. Measured
from falling clock edge after stop bit of write transaction.
9. Time from two-wire interface de-assertion of TX_DISABLE (A2h, byte 110, bit 6) to when the modulated optical output rises above 90% of
nominal.
10. Time from fault to two-wire interface TX_FAULT (A2h, byte 110, bit 2) asserted.
11. Time for two-wire interface assertion of Rx_LOS (A2h, byte 110, bit 1) from loss of optical signal.
12. Time for two-wire interface de-assertion of Rx_LOS (A2h, byte 110, bit 1) from presence of valid optical signal.
13. From power on to data ready bit asserted (A2h, byte 110, bit 0). Data ready indicates analog monitoring circuitry is functional.
14. Time from power on until module is ready for data transmission over the serial bus (reads or writes over A0h and A2h).
15. Time from stop bit to completion of a 1-8 byte write command. For a one to four byte write the maximum cycle time is 40ms and for a five to
eight byte write the maximum cycle time is 80ms.
16. Time between STOP and START commands.
17. Module may clock stretch for f_serial_clock greater than 100 kHz.
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