XRT8000_06 Datasheet, PDF (4/24 Pages) Exar Corporation – Clock Synchronizer/Adapter for Communications

XRT8000
DC ELECTRICAL CHARACTERISTICS (Except Serial Interface) Operating Temperature: -40_C to 85_C
Test Conditions: T_A = 25_C, V_CC = 5.0V ± 5% Unless Otherwise Specified
Symbol
V_IL
V_IH
V_OL
V_OH
V_OL
V_OH
I_IL
I_IH
I_IL
I_IH
I_CC
R_IN
Parameter
Input low level
Input high level
Output low level (CLK1,CLK2)
Output high level (CLK1,CLK2)
Output low level (LOCKDET,SYNC)
Output high level (LOCKDET,SYNC)
Input low current (CSB,MSB)
Input high current (CSB,MSB)
Input low current (except CSB,MSB)
Input high current (except CSB,MSB)
Operating current
Input pull-up resistance (CSB,MSB)
Min Typ
2.0
2.4
2.4
-10
20
50 100
Max
0.8
0.4
0.4
-150
10
10
35
150
Unit
V
V
V
V
V
V
mA
mA
mA
mA
mA
KW
Conditions
I_OL = -6.0 mA
I_OH = 6.0 mA
I_OL = -3.0 mA
I_OH = 3.0 mA
V_IN = V_CC
V_IN = V_CC
No load. Clock = 2.1 MHz
AC ELECTRICAL CHARACTERISTICS (See Figure 3)
Symbol
T₁
T₂
T₃
T₆₁
Parameter
Input frequency
Minimum input signal high to
low duration
Output frequency
Duty cycle CLK1, CLK2
T₇₄
Jitter added 8KHz-40KHz
T₇₄
Jitter added 10Hz-40KHz
T₇₄
Broad Band-jitter
T₇₄
Jitter added 20Hz-100KHz
T₇₄
Jitter added 18kHz-100KHz
T₈
Capture time
T₉
Clock output rise time
T₁₀
Clock output fall time
T₁₁₂
Duty cycle SYNC
T₁₄
Delay time between the rising
edge of SYNC and the rising
edge of CLK1 or CLK2
Spec.³ Min Typ Max
0.008
32.7
12
1.2
2.1
47.5 50
52.5
0.025
0.025
0.05
1.5
0.2
0.007 0.02
0.022
0.03 0.05
0.05 0.07
0.01 0.03
40
10
10
40
60
T-20
T
T+20
Unit
MHz
ns
Conditions
KHz
% V_CC/2 switch point. 30pF
load.
UI Output =1.544MHz
UI Output =1.544MHz
UI Output =1.544MHz
UI Output =2.048MHz
UI Output =2.048MHz
ms
ns 30pF load. Measured at
20/80 %
ns 30pF load. Measured at
20/80 %
% V_CC/2 switch point
(in master forward mode).
30pF load.
ns See table 12 for values of T
Notes:
T4
1 _{T6 = ( T4 + T5 )}
T 12
2 _{T11 = ( T 12 + T 13 )}
3 _{Specifications from AT&T Publication 62411 and ITU-T Recommendations G-823 (for 1.544MHz and 2.048MHz, respectively).}
4 _{T7 is guaranteed by characterization, not tested.}
Specifications are subject to change without notice.
Rev. 1.11
4