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M1025 Datasheet(PDF) 2 Page - Integrated Circuit Systems

No. de Pieza. M1025
Descripción  VCSO BASED CLOCK PLL WITH AUTOSWITCH
Descarga  14 Pages
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Fabricante  ICST [Integrated Circuit Systems]
Página de inicio  http://www.icst.com
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M1025 Datasheet(HTML) 2 Page - Integrated Circuit Systems

 
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M1025/26 Datasheet Rev 1.0
2 of 14
Revised 28Jul2004
I n te g r at ed Ci rcui t Systems , In c. ● N e tw o r ki ng & Co mmun ica t io ns ● ww w. icst.co m ● tel (5 08 ) 85 2-5 4 0 0
Integrated
Circuit
Systems, Inc.
M1025/26
VCSO BASED CLOCK PLL WITH AUTOSWITCH
Prod uct Data Sh eet
PIN DESCRIPTIONS
Number
Name
I/O
Configuration
Description
1, 2, 3, 10, 14, 26
GND
Ground
Power supply ground connections.
4
9
OP_IN
nOP_IN
Input
External loop filter connections.
See Figure 5, External Loop Filter, on pg. 9.
5
8
nOP_OUT
OP_OUT
Output
6
7
nVC
VC
Input
11, 19, 33
VCC
Power
Power supply connection, connect to +3.3V.
12
AUTO
Input
Internal pull-down resistor1
Automatic/manual reselection mode for clock input:
Logic 1 automatic reselection upon clock failure
(non-revertive)
Logic 0 manual selection only (using REF_SEL)
13
REF_ACK
Output
Reference Acknowledgement pin for input mux state; outputs
the currently selected reference input pair:
Logic 1 indicates nDIF_REF1, DIF_REF1
Logic 0 indicates nDIF_REF0, DIF_REF0
15
16
FOUT
nFOUT
Output
No internal terminator
Clock output pair. Differential LVPECL (CML, LVDS available).
17
18
P_SEL1
P_SEL0
Internal pull-down resistor1
Note 1: For typical values of internal pull-down and pull-UP resistors, see
DC Characteristics on pg. 11.
Post-PLL , P divider selection. LVCMOS/LVTTL. See Table 5,
P Divider Look-Up Table (LUT), on pg. 4.
20
nDIF_REF1
Input
Biased to Vcc/2 2
Note 2: Biased toVcc/2, with 50k
Ω to Vcc and 50kΩ to ground. See Differential Inputs Biased to VCC/2 on pg. 11.
Reference clock input pair 1. Differential LVPECL or LVDS.
Resistor bias on inverting terminal supports TTL or LVCMOS.
21
DIF_REF1
Internal pull-down resistor1
22
REF_SEL
Input
Internal pull-down resistor1
Reference clock input selection. LVCMOS/LVTTL:
Logic 1 selects DIF_REF1, nDIF_REF1.
Logic 0 selects DIF_REF0, nDIF_REF0.
23
nDIF_REF0
Input
Biased to Vcc/2 2
Reference clock input pair 0. Differential LVPECL or LVDS.
Resistor bias on inverting terminal supports TTL or LVCMOS.
24
DIF_REF0
Internal pull-down resistor 1
25
NC
No internal connection.
27
28
29
30
MR_SEL3
MR_SEL2
MR_SEL0
MR_SEL1
Input
Internal pull-down resistor1
M and R divider value selection. LVCMOS/ LVTTL.
See Tables 3 and 4, M and R Divider Look-Up Tables (LUT)
on pg. 3.
31
LOL
Output
Loss of Lock indicator output. Asserted when internal PLL is
not tracking the input reference for frequency and phase. 3
Logic 1 indicates loss of lock.
Logic 0 indicates locked condition.
Note 3: See LVCMOS Output in
DC Characteristics on pg. 11.
32
NBW
Input
Internal pull-UP resistor1
Narrow Bandwidth enable. LVCMOS/LVTTL:
Logic 1 - Narrow loop bandwidth, R
IN = 2100k
Ω.
Logic 0 - Wide bandwidth, R
IN = 100k
Ω.
34, 35, 36
DNC
Do Not Connect.
Table 2: Pin Descriptions


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