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參數(shù)資料
| 型號(hào)： | T7264 |
| 英文描述： | T7264 U-Interface 2B1Q Transceiver |
| 中文描述： | T7264 U型接口2B1Q收發(fā)器 |
| 文件頁數(shù)： | 35/54頁 |
| 文件大?。?/td> | 876K |
| 代理商： | T7264 |
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Data Sheet
April 1998
T7264 U-Interface 2B1Q Transceiver
Lucent Technologies Inc.
35
Electrical Characteristics
All characteristics are for a 15.36 MHz crystal, 135
line load, random 2B+D data,
V
DD
= 5 V
±
0.25 V, –40
°
C to +85
°
C, output capacitance = 50 pF.
Table 24. Power Consumption
Table 25. Performance Ratings
Table 26. Crystal Characteristics: Fundamental Mode Crystal
These are the characteristics of a crystal for meeting the
±
100 ppm requirements of T1.601 for NT operation.
The parasitic capacitance of the PC board to which the T7264 crystal is mounted must be kept within the range
0.6
±
0.4 pF.
For LT operation or for NT applications that can tolerate a free-running frequency tolerance of up to
±
150 ppm, T
OL
and C
m
may be relaxed as long as they satisfy the following:
| T
OL
+ (3300 ppm) x C
m
(in pF) |
≤
150 ppm
using the nominal value of C
m
. All other parameters are unchanged except that the shunt capacitance, C
O
, should
change in proportion with any change in C
m
.
Possible sources for 15.36 MHz crystals for use with the T7264 include:
* MTRON is a registered trademark of MTRON Industries, Inc., a wholly owned subsidiary of Lynch Corporation. (Lynch is a registered trade-
mark of Lynch Corporation.)
Parameter
Test Conditions
Operating, Random Data
Powerdown Mode
Min
—
—
Typ
275
30
Max
350
50
Unit
mW
mW
Power Consumption
Power Consumption
Parameter
Test Conditions
—
—
26 AWG cable
Min
—
—
—
Typ
200
3.5
—
Max
—
—
Unit
ms
s
—
Warm Start Time
Cold Start Time
Error Rate over 18 kft
10
–7
Parameter
Symbol
F
O
T
OL
Test Conditions
With 25.0 pF of loading
—
Specifications
15.36011
±
60
Unit
MHz
ppm
Center Frequency
Tolerance Including Calibration,
Temperature Stability, and Aging
Drive Level
Series Resistance
Shunt Capacitance
Motional Capacitance
D
L
R
S
C
O
Cm
Maximum
Maximum
—
—
0.5
20
mW
pF
fF
3.0
±
20%
12
±
20%
CTS Knights
MTRON*
William J. Winch
(Winch Sales Associates)
at 1-908-613-1515
P/N 4044-001
Saronix
Tom Haney at 1-704-684-0242
P/N 020-2807-0
Laura Derrickson at 1-800-227-8974
(in CA, 1-800-422-3355
P/N SRX5144(-N)
For LT applications, a relaxed specification part is avail-
able where TOL =
±
85 ppm and Cm = 18 fF
±
20%.
P/N SRX5152(–N [no vinyl coating])
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