T-8110L AGERE [Agere Systems], T-8110L Datasheet - Page 125

• Manufacturer Part Number: T-8110L
• Manufacturer: AGERE [Agere Systems]

February 2004
Agere Systems Inc.
13 Electrical Characteristics
13.2 Crystal Specifications
13.2.1 XTAL1 Crystal (continued)
If an oscillator is used (see Section 6.4.4 on page 61), the signal has to be connected to the XTAL1_IN pin.
XTAL1_OUT must be left unconnected in this configuration. XTAL1_IN and XTAL1_OUT are not 5 V tolerant. The
oscillator must meet the requirements shown below.
Table 101. 16.384 MHz Oscillator Requirements
13.2.2 XTAL2 Crystal
XTAL2 is an optional crystal oscillator input. If a crystal is used, it has to be a 6.176 MHz or a 12.352 MHz crystal
and must be connected between the XTAL2_IN and the XTAL2_OUT pins, as shown in the diagram below. Exter-
nal 24 pF, 5% capacitors must be connected from XTAL2_IN and XTAL2_OUT to Vss. The ±32 ppm tolerance is
the suggested value if the oscillator is used as the clocking source while mastering the bus. Otherwise, a crystal
with a lesser tolerance can be used (see Table 121).
If XTAL2 is not used, XTAL2_IN should be tied to V
Table 102. XTAL2 Specifications
* 120
† 24 pF for 6.176 MHz crystal also.
‡ 18 pF for 6.176 MHz crystal also.
If an oscillator is used (see Section 6.5.1 on page 63), the signal has to be connected to the XTAL2_IN pin.
XTAL2_OUT must be left unconnected in this configuration. XTAL2_IN and XTAL2_OUT are not 5 V tolerant. The
oscillator must meet the requirements shown below.
Table 103. 6.176 MHz/12.352 MHz Oscillator Requirements
Frequency
Maximum Rise or Fall Time
Minimum Pulse Width
Frequency
Oscillation Mode
Effective Series Resistance
Load Capacitance
Shunt Capacitance
Frequency Tolerance and Stability
Frequency
Maximum Rise or Fall Time
Minimum Pulse Width
maximum for 6.176 MHz crystal.
Parameter
Parameter
Parameter
(continued)
Fundamental, parallel resonance
(continued)
10 ns, 10%—90% V
54 ns
Low
75*
7 pF maximum
12.352 MHz
DD
32 ppm
6.176 MHz
18
Value
and XTAL2_OUT should be left unconnected.
maximum
Value
‡
pF
Ambassador T8110L H.100/H.110 Switch
54 ns
High
DD
20 ns
Low
10 ns, 10%—90% V
16.384 MHz
10 ns, 10%—90% V
XTAL2_OUT
27 ns
T8110L
XTAL2_IN
Low
Value
12.352 MHz
Value
1 M
20 ns
DD
High
12.352 MHz
CRYSTAL
27 ns
High
DD
24 pF
24 pF
†
†
V
5-6390d
SS
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