88e3015 Marvell Semiconductor, Inc., 88e3015 Datasheet - Page 98

• Manufacturer Part Number: 88e3015
• Description: Integrated 10/100 Fast Ethernet Transceiver
• Manufacturer: Marvell Semiconductor, Inc.

Figure 19: Clock Timing
Doc. No. MV-S103657-00, Rev. C
Page 98
4.6.2 XTAL_IN Input Clock Timing
(Over full range of values listed in the Recommended Operating Conditions unless otherwise specified)
Sy mbo l
T
T
T
T
T
T
P_XTAL_IN
H_XTAL_IN
L_XTAL_IN
R_XTAL_IN
F_XTAL_IN
J_XTAL_IN
1. If the crystal option is used, ensure that the frequency is 25 MHz ± 50 ppm. Capacitors must be chosen carefully - see application
2. PLL generated clocks are not recommended as input to XTAL_IN since they can have excessive jitter. Zero delay buffers are also
3. Broadband peak-peak = 200 ps, Broadband rms = 3 ps, 12 kHz to 20 MHz rms = 1 ps.
note supplied by the crystal vendor.
not recommended for the same reason.
Pa rame ter
XTAL_IN Period
XTAL_IN High time
XTAL_IN Low time
XTAL_IN Rise
XTAL_IN Fall
XTAL_IN total jitter
88E3015/88E3018
Integrated 10/100 Fast Ethernet Transceiver
XTAL_IN
Input
Document Classification: Proprietary Information
2
T
R_XTAL_IN
V
CONFIDENTIAL
V
Con di ti on
25 MHz
25 MHz
25 MHz
V
V
25 MHz
V
V
25 MHz
25 MHz
IH
IL
IL
IH
IH
IL
(max) to
(max) -
(min) -
(min) to
T
H_XTAL_IN
1
T
P_XTAL_IN
Mi n
40
-50 ppm
14
14
-
-
-
T
L_XTAL_IN
T
F_XTAL_IN
Ty p
40
20
20
3.0
3.0
-
October 26, 2006, Advance
Max
40
+50 ppm
26
26
-
-
200
Copyright © 2006 Marvell
Uni ts
ns
ns
ns
ns
ns
ps
3