10

Table 8. Transceiver Timing Characteristics

Parameter

Symbol

Minimum

Maximum

Unit

Notes

Hardware TX_DISABLE Assert Time

t_off

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 Assert Time

t_loss_on

100

μs

Note 6

Hardware RX_LOS De-Assert Time

t_loss_off

100

μs

Note 7

Software TX_DISABLE Assert Time

t_off_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_off_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.

Table 9. Transceiver Digital Diagnostic Monitor (Real Time Sense) Characteristics

Parameter

Symbol

Min

Units

Notes

Transceiver Internal Temperature Accuracy

± 3.0

°C

Transceiver Internal Supply Voltage Accuracy

± 0.1

V

Transmitter Laser DC Bias Current Accuracy

± 10

%

Percentage of nominal bias value

Transmitted Average Optical Output Power Accuracy

± 3.0

dB

Valid from 100

μW to 500μW, avg

Received Average Optical Input Power Accuracy

± 3.0

dB

Valid from 10

μW to 500μW avg