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參數(shù)資料
| 型號： | TR857FA-0D50M |
| 英文描述： | Optoelectronic |
| 中文描述： | 光電 |
| 文件頁數(shù)： | 6/19頁 |
| 文件大?。?/td> | 201K |
| 代理商： | TR857FA-0D50M |
6
TIMING REQUIREMENTS OF CONTROL AND STATUS I/O
PARAMETER
SYMBOL
MIN.
MAX.
UNIT
CONDITIONS
Tx Disable
assert time
t_off
10
μ
s
Timing from rising edge of Tx Disable
to when the optical output falls below
10% of nominal
Timing from falling edge of Tx Disable
to when the modulated optical output
rises above 90% of nominal
Tx Disable
Negate time
t_on
1
ms
Time to initialize
Includes reset of
Tx Fault
Tx Fault
Assert time
Tx Disable to
Reset
Los Assert time
Los
Deassert time
t_init
300
ms
From power on or negation of Tx
Fault using Tx Disable
t_fault
100
μ
s
Time from fault to Tx Fault on
t_reset
10
μ
s
Time Tx Disable must be held high to
reset Tx Fault
Time from LOS state to Rx Los assert
Time from non-LOS state to Rx Los
deassert
Timing from rising or falling edge of
rate
select
input
bandwidth is in conformance with
appropriate specification
t_loss_on
100
μ
s
t_loss_off
1000
μ
s
Rate select
Change time
t_ratesel
100
μ
s
until
receiver
Serial ID clock
rate
f_s_clock
100
kHz
SFP transceiver power on initialization procedure, TX_DISABLE negated.
During power on of the SFP transceiver, TX_FAULT may be asserted (High) as soon as power supply
voltages are within specification. For transceiver initialization with TX_DISABLE negated, TX_FAULT
shall be negated when the transmitter safety circuitry has detected that the transmitter is operating in
its normal state. If a transmitter fault has not occurred, TX_FAULT shall be negated within a period
t_init from the time that VCCT exceeds the specified minimum operating voltage. If TX_FAULT
remains asserted beyond the period t_init, the host may assume that a transmission fault has been
detected by the transceiver. The power on initialization timing for a transceiver with TX_DISABLE
negated is shown in Figure 3.
Figure 3. Power on initialization of SFP transceivers, Tx Disable negated
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