Datasheet

CCD
DD
V
8 7 6 5 4 3 2 1
15
28
78Q2123/78Q2133 Data Sheet DS_21x3_001
R4
100
R5
100
VCC
R2
5.1K
LED 1 D1
LED 0 D2
VCC
R1
680
R3
680
VCC
INTR
C1
0.1uF
R8
49.9
R9
49.9
VCC
R6 R7
C5
C2
VCC
J1
MDIO
MDC
RXD3
RXD2
RXD1
RXD0
RXDV
R11
100
0.1uF
R10
100
9
10
V
11 GN
RX_D
78Q2123
78Q2133
33
PB_GND
32
INTR
31
TXON
30
TXOP
0.01uF
T1
1
2
TD+
TDCT
0.1uF
16
TX+
15
TXCT
RJ45
8
7
6
RXCLK
RXER
TXER
TXCLK
TXEN
TXD0
TXD1
R12 R13
12
RX_CLK
13
RX_ER
14
TX_ER
16
TX_CLK
TX_EN
78Q2123
GND
29
RXIP
27
RXIN
26
VCC
25
XTLN
3
4
TD-
5
NC1
6
NC2
7
RD+
8
RDCT
RD-
14 5
TX-
13 4
NC4
12 3
NC3
11 2
RX+
10 1
RXCT
9
RX-
TXD2
TXD3
COL
CRS
100 100
Y1
25.000MHz
TLA-6T118LF
VCC
R14
R15 C11
C12
R16 R17 R18 R19 R20 R21 C10
C13 C14
49.9
49.9
0.01UF 0.1UF
75 75 75 75 75 75 0.1uF
1.5kV
R22
100
R23
100
VCC
R24
10k
C15
0.1uF
27pF 27pF
C13 and C14 must be calibrated
in actual application board f or
25.000MHz +/-50ppm.
Figure 7: Application Diagram for 78Q2123/78Q2133
32 Rev. 1.6
17 18 19 20 21 22 23 24
TXD0 TXD1 TXD2 TXD3 COL CRS RST XTLP
RXD0 RXD1 RXD2 RXD3 LED0 LED1 MDC MDIO
10 9