ICS843N252-45 Datasheet, PDF (2/16 Pages) Integrated Device Technology – Fourth generation FemtoClock

ICS843N252-45 Data Sheet
FEMTOCLOCK^® CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
Table 1. Pin Descriptions
Number
1
2, 9, 15
3
4
5, 6
7
8, 12
10
11
13, 14
16
Name
CLK_ENA
V_EE
QA
V_CCOA
nc
V_CCA
V_CC
XTAL_OUT
XTAL_IN
nQB, QB
CLK_ENB
Type
Input
Pullup
Power
Output
Power
Unused
Power
Power
Input
Output
Input
Pullup
Description
Clock enable pin. LVCMOS/LVTTL interface levels. See Table 3A.
Negative supply pins.
Single-ended clock output. LVCMOS/LVTTL interface levels.
Output supply pin for QA output.
No connect.
Analog supply pin.
Power supply pin.
Crystal oscillator interface XTAL_IN is the input, XTAL_OUT is the output.
Differential output pair. LVPECL interface levels.
Clock enable pin. LVCMOS/LVTTL interface levels. See Table 3B.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Symbol
C_IN
C_PD
R_PULLUP
R_OUT
Parameter
Input Capacitance
Power Dissipation Capacitance
Input Pullup Resistor
Output Impedance QA
Function Tables
Table 3A. CLK_ENA Function Table
Input
Outputs
CLK_ENA
QA
0
High-Impedance
1
Active
Test Conditions
V_CC = V_{CCO_A} = 3.465V
V_{CCO_A} = 3.465V
Minimum
Typical
4
7
51
15
Maximum
Units
pF
pF
kΩ
Ω
Table 3B. CLK_ENB Function Table
Input
Outputs
CLK_ENB
QB
nQB
0
HIGH
LOW
1
Active
Active
ICS843N252GG-45 REVISION A JULY 6, 2011
2
©2011 Integrated Device Technology, Inc.