SCG2503 Datasheet, PDF (3/12 Pages) Connor-Winfield Corporation – Synchronous Clock Generators

Table 3
Symbol
V_IH
V_IL
T_IO
C_OUT
V_HO
V
IO
T _IR
Input and Output Characteristics
Parameter
High level input voltage
Low level input voltage
I/O to output valid
Output capacitance
High level output voltage loh = -4mA
Low Level output voltage lo1 = 8mA
Input reference signal pulse width
Minimum
2.0
0
-
-
2.40
-
30
Nominal
-
-
-
-
-
-
-
Maximum
5.5
0.8
10
10
-
0.4
-
Units
V
V
nS
pF
-
-
nS
Notes
Vcc Min
Vcc Max
Table 4
Frequency (MHz)
77.76
Output Jitter Specifications
Jitter BW 10 Hz - 1 MHz
pS (RMS) m UI
20 Typ.
1.555Typ.
SONET Jitter BW 12 kHz - 20 MHz
pS (RMS)
m UI
1 Max., 0.5 Typ.
0.078 Max.
Table 5
Reset/
Tri-State
1
0
0
0
0
0
0
0
SEL_AB
X
X
0
1
0
1
0
X
Input Selection / Output Response
INPUTS
REF_A
REF_B
FR
X
X
X
X
X
1
A
A
0
NA
A
0
NA
A
0
A
NA
0
A
NA
0
NA
NA
0
FR_status
TS
1
0
0
0
0
0
1
OUPUTS
Alarm
TS
1
0
0
1
1
0
1
Oscillator 8 kHz
Output Output
FR
TS
FR
FR
LRA
LRAD
LRB
LRBD
U
U
U
U
LRA
LRAD
FR
FR
TS = Tri-State
FR = Free Run
LRA = Locked to Ref A
LRB = Locked to Reb B
U = Unstable
LRAD = Locked to Ref A and divided down
LRAB = Locked to ref B and divided do wn
X = Don’t care
Notes
6.0
6.0
NOTES:
1.0 Requires external regulation
2.0 Externally selectable via Input Select AB
3.0 Entry into Free Run doesn’t meet requirement for initial 2.33 seconds of self-timing
4.0 The wider bandwidth of this model may result in a break in the GR-253-CORE, R5-135 Switching Mask for obser vation times of <50ms.
5.0 Phase Drift from 0° to 70°C.
6.0 On alar m asser tion, switch references. If alarm is still active, force Free Run
7.0 Under rapidly changing input conditions. (-11ppm to +11ppm)
Data Sheet #: SG081 Page 3 of 12 Rev: 00 Date: 06/21/05
© Copyright 2005 The Connor-Winfield Corp. All Rights Reser ved Specifications subject to c hange without notice