RTL8208B-LF/RTL8208BF-LF
Datasheet
9.4. AC Characteristics
Table 39. AC Characteristics
Parameter
SYM Conditions
Min
Typical Max Units
Transmitter, 100Base-TX
Differential Output
Voltage, Peak-to-Peak
Differential Output
Voltage Symmetry
Differential Output
Overshoot
V
2.022
100.3
2.7
-
-
-
V
%
%
50Ω from each output to Vcc, Best-fit over
14 bit times
50Ω from each output to Vcc, |Vp+|/|Vp-|
-
-
-
OD
V
V
OS
Percent of Vp+ or Vp-
10-90% of Vp+ or Vp-
OO
tr ,tf
Rise/Fall Time
4.2/4.3
100
-
-
-
ns
ps
ps
-
-
-
Rise/Fall Time Imbalance
Duty Cycle Distortion
|tr - tf|
-
Deviation from best-fit time-grid, 010101 …
Sequence
133
Timing Jitter
-
Idle pattern
650
-
ps
-
Transmitter, 10Base-TX
Differential Output
Voltage, Peak-to-Peak
TP_IDL Silence Duration
V
4.56
-
-
V
50Ω from each output to Vcc, all pattern
-
OD
-
Period of time from start of TP_IDL to link
pulses or period of time between link pulses
10.5
15.8
ms
Transmitter Output Jitter
Harmonic Content
-
-
6
-
-
ns
-
-
dB below fundamental, 20 cycles of all
ones data
31.6
dB
9.5. Digital Timing Characteristics
Table 40. Digital Timing Characteristics
SYM Conditions
100Base-TX Transmit System Timing
Parameter
Min
Typical Max Units
Active TX_EN Sampled
to first bit of ‘J’ on MDI
output
Inactive TX_EN Sampled
to first bit of ‘T’ on MDI
output
-
-
11
15
11
12
16
12
Bits
Bits
Bits
-
-
-
TX Propagation Delay
tTXpd From TXD[1:0] to TXOP/N
100Base-TX Receive System Timing
From RXIP/N to CRS_DV
First bit of ‘J’ on MDI
input to CRS_DV assert
First bit of ‘T’ on MDI
input to CRS_DV de-
assert
-
-
-
-
6
8
Bits
Bits
From RXIP/N to CRS_DV
16
18
RX Propagation Delay
tRXpd From RXIP/N to RXD[1:0]
10Base-TX Transmit System Timing
tTXpd From TXD[1:0] to TXOP/N
From TX_EN assert to TXOP/N
-
15
17
Bits
TX Propagation Delay
TX_EN to MDI output
-
-
5
5
6
6
Bits
Bits
-
Single-Chip Octal 10/100-TX/FX PHY Transceiver
52
Track ID: JATR-1076-21 Rev. 1.3
REALTEK [ Realtek Semiconductor Corp. ]
