HDMP-1638 Datasheet, PDF (16/19 Pages) Agilent(Hewlett-Packard) – Gigabit Ethernet Transceiver Chip with Dual Serial I/O and Differential PECL Clock Inputs

16
NAME
PIN
TX[0]
2
TX[1]
3
TX[2]
4
TX[3]
5
TX[4]
6
TX[5]
7
TX[6]
8
TX[7]
9
TX[8]
10
TX[9]
11
TXCAP0
17
TXCAP1
16
SIG_DET
26
V_CC_RX
28
58
V_CC_RXA
50
V_CC_RXHS
54
V_CC_RXTTL
29
37
42
V_CC_TX
20
V_CC_TXA
18
V_CC_TXECL
61
V_CC_TXHS
64
TYPE
I-TTL
SIGNAL
Data Inputs: One 10 bit, 8B/10B encoded data byte. TX[0]
is the first bit transmitted. TX[0] is the least significant bit.
C
O-TTL
S
S
S
S
Loop Filter Capacitor: A loop filter capacitor must be
connected across the TXCAP1 and TXCAP0 pins (typical
value=0.1 µF).
Signal Detect: Indicates a loss of signal on the high-speed
differential inputs, ± DINB, as in the case where the
transmission cable becomes disconnected.
If ± DIN>=200 mV peak-to-peak, SIG_DET=logic 1.
If ± DIN<200 mV and ± DIN>50 mV, SIG_DET=undefined.
If ± DIN<=50 mV, SIG_DET=logic 0.
Logic Power Supply: Normally 3.3 volts. Used for
internal receiver PECL logic. It should be isolated from
the noisy TTL supply as well as possible.
Analog Power Supply: Normally 3.3 volts. Used to provide
a clean supply line for the PLL and high speed analog cells.
High Speed Supply: Normally 3.3 volts. Used only for
the high speed receiver cell (HS_IN). Noise on this line
should be minimized for best operation.
TTL Power Supply: Normally 3.3 volts. Used for all TTL
receiver output buffer cells.
S
Logic Power Supply: Normally 3.3 volts. Used for
internal transmitter PECL logic. Also used for all
transmitter TTL input buffer cells.
S
Analog Power Supply: Normally 3.3 volts. Used to provide
a clean supply line for the PLL and high speed analog cells.
S
High Speed ECL Supply: Normally 3.3 volts. Used only
for the last stage of the high speed transmitter output cell
(HS_OUT) as shown in Figure 10. Due to high current transi-
tions, this V_CC should be well bypassed to a ground plane.
S
High Speed Supply: Normally 3.3 volts. Used by the
transmitter side for the high speed circuitry. Noise on this
line should be minimized for best operation.