XRT8000_06 Datasheet, PDF (5/24 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 = 3.3V ± 5% Unless Otherwise Specified
Symbol
Parameter
Min Typ Max Unit
Conditions
V_IL
Input low level
V_IH Input high level
V_OL Output low level (CLK1,CLK2)
V_OH Output high level (CLK1,CLK2)
V_OL Output low level (LOCKDET,SYNC)
V_OH Output high level (LOCKDET,SYNC)
I_IL
Input low current (CSB,MSB)
I_IH
Input high current (CSB,MSB)
I_IL
Input low current (except CSB,MSB)
I_IH
Input high current (except CSB,MSB)
I_CC Operating current
R_IN Input pull-up resistance (CSB,MSB)
0.8
2.0
0.4
2.4
0.4
2.4
-150
10
-10
10
11
30
50 100 150
V
V
V I_OL = -3 mA
V I_OH = 3 mA
V I_OL = -2.5 mA
V I_OH = 2.5 mA
mA
mA V_IN = V_CC
mA
mA V_IN = V_CC
mA No load. Clock = 2.1 MHz
KW
AC ELECTRICAL CHARACTERISTICS (See Figure 3)
Symbol
Parameter
Spec.³ Min Typ Max
T₁
Input frequency
T₂
Minimum input signal high to
low duration
0.008
32.7
12
T₃
Output frequency
T₆₁
Duty cycle CLK1, CLK2
1.2
2.1
47.5 50
52.5
T₇₄
Jitter added 8KHz-40KHz
T₇₄
Jitter added 10Hz-40KHz
T₇₄
Broad Band
T₇₄
Jitter added 20Hz-100KHz
T₇₄
Jitter added 18kHz-100KHz
T₈
Capture time
T₉
Clock output rise time
0.025
0.025
0.05
1.5
0.2
0.01 0.02
0.030
0.035 0.05
0.045 0.07
0.010 0.03
40
14
T₁₀
Clock output fall time
14
T₁₁₂
Duty cycle SYNC
40
60
T₁₄
Delay time between SYNC
and CLK1 or CLK2
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 =} ( _{T 4 + T 5 )}
T 12
2 _{T11 =} ( _{T 12 + T 13 )}
3 _{Specifications from AT&T Publication 62411 and ITUT Rcommendations 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
5