HDMP-1636A Datasheet, PDF (5/18 Pages) Agilent(Hewlett-Packard) – Gigabit Ethernet and Fibre Channel SerDes ICs

5
HDMP-1636/1646A/T1636A (Transmitter Section) – Fibre Channel
Timing Characteristics
T_A[1] = 0°C to +70°C, V_CC = 3.15 V to 3.45 V
Symbol
Parameter
Units
Min.
Typ.
t_setup
Setup Time
nsec
2
t_hold
t_txlat^[2]
Hold Time
Transmitter Latency
nsec
nsec
1.5
4.2
bits
4.4
Max.
Notes:
1. Device tested and characterized under T_A conditions specified, with T_C monitored at approximately 20° higher than T_A.
2. The transmitter latency, as shown in Figure 4, is defined as the time between the latching in of the parallel data word (as triggered
by the rising edge of the transmit byte clock, REFCLK) and the transmission of the first serial bit of that parallel word (defined by
the rising edge of the first bit transmitted).
REFCLK
TX[0]-TX[9]
DATA
DATA
DATA
t_SETUP
t_HOLD
Figure 3. Transmitter Section Timing.
DATA
DATA
1.4 V
2.0 V
0.8 V
DATA BYTE A
DATA BYTE B
± DOUT T5 T6 T7 T8 T9 T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T0 T1 T2 T3 T4 T5
t_TXLAT
TX[0]-TX[9]
DATA BYTE B
DATA BYTE C
REFCLK
1.4 V
Figure 4. Transmitter Latency.