ICS843S2807
FEMTOCLOCK™ CRYSTAL-TO-LVPECL/LVDS/LVCMOS CLOCK GENERATOR
PRELIMINARY
TABLE 1. PIN DESCRIPTIONS
Number
1,
2
3, 16, 17, 24
4,
5
6, 13,
20, 27, 32
7, 21
8
Name
F_SEL0,
F_SEL1
VCC
XTAL_IN,
XTAL_OUT
V
EE
V VCCA2, CCA1
RESET
Type
Input Pullup
Power
Input
Power
Description
Frequency select pins. LVCMOS/LVTTL interface levels.
See Table 3A.
Core supply pins.
Crystal oscillator interface. XTAL_OUT is the output.
XTAL_IN is the input.
Negative supply pins.
Power
Analog supply pins.
Input Pulldown Resets the dividers and PLL. LVCMOS/LVTTL interface levels.
9
10
11
12
14, 15
OE
MARGIN
MARGIN_MODE
PLL_BYPASS
QD0, nQD0
Input
Input
Input
Input
Output
Pullup
Pulldown
Pulldown
Pulldown
Output enable pin. LVCMOS/LVTTL interface levels.
Selects between the margin and normal mode.
LVCMOS/LVTTL interface levels. See Table 3B.
Selects between ±5% margin.
LVCMOS/LVTTL interface levels. See Table 3B.
Selects between the PLL and XTAL as the input to the dividers.
When LOW, selects PLL. When HIGH, selects XTAL.
LVCMOS/LVTTL interface levels.
Differential Bank D clock outputs. LVDS interface levels.
18, 19
nQC0, QC0 Output
Differential Bank C clock outputs. LVPECL interface levels.
22, 23
nQA1, QA1 Output
Differential Bank A clock outputs. LVPECL interface levels.
25, 30
26
VCCO_LVCMOS
QA0
Power
Output
Output supply pins for LVCMOS/LVTTL outputs.
Single-ended Bank A clock output.
LVCMOS/LVTTL interface levels. 15Ω impedance.
28, 29
QB1, QB0
Output
Single-ended Bank B clock outputs.
LVCMOS/LVTTL interface levels. 15Ω impedance.
31
REF_OUT
Output
Reference clock output. LVCMOS/LVTTL interface levels.
15Ω impedance.
NOTE: Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
C
PD
RPULLDOWN
RPULLUP
ROUT
Parameter
Input Capacitance
Power
Dissipation Capacitance
Input Pulldown Resistor
Input Pullup Resistor
Output Impedance
QA0,
QB0, QB1,
REF_OUT
QA0,
QB0, QB1,
REF_OUT
Test Conditions
Minimum Typical Maximum Units
4 pF
VCC, VCCO_LVCMOS = 3.465V
TBD
51
51
pF
kΩ
kΩ
VCCO_LVCMOS = 3.465V
15 Ω
IDT™ / ICS™ LVPECL/LVDS/LVCMOS CLOCK GENERATOR
2
ICS843S2807BY REV. A JANUARY 30, 2008
