11
Table 9. Transceiver Timing Characteristics
(T
C
= -40°C to 85°C, VccT, VccR = 3.3 V ± 10%)
Parameter Symbol Minimum Maximum Unit Notes
Hardware TX_DISABLE Assert Time t_o 10 μs Note 1
Hardware TX_DISABLE Negate Time t_on 1 ms Note 2
Time to initialize, including reset of TX_FAULT t_init 300 ms Note 3
Hardware TX_FAULT Assert Time t_fault 100 μs Note 4
Hardware TX_DISABLE to Reset t_reset 10 μs Note 5
Hardware RX_LOS DeAssert Time t_loss_on 100 μs Note 6
Hardware RX_LOS Assert Time t_loss_o 100 μs Note 7
Software TX_DISABLE Assert Time t_o _soft 100 ms Note 8
Software TX_DISABLE Negate Time t_on_soft 100 ms Note 9
Software Tx_FAULT Assert Time t_fault_soft 100 ms Note 10
Software Rx_LOS Assert Time t_loss_on_soft 100 ms Note 11
Software Rx_LOS De-Assert Time t_loss_o _soft 100 ms Note 12
Analog parameter data ready t_data 1000 ms Note 13
Serial bus hardware ready t_serial 300 ms Note 14
Write Cycle Time t_write 10 ms Note 15
Serial ID Clock Rate f_serial_clock 400 kHz
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.
