ICS840051 Datasheet, PDF (2/10 Pages) Integrated Circuit Systems – FEMTOCLOCK CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
ICS840051
FEMTOCLOCKS™ CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
V_DDA
Power
Analog supply pin.
2
OE
Input
Pullup
Output enable pin. When HIGH, Q0 output is enabled. When LOW,
forces Q0 to HiZ state. LVCMOS/LVTTL interface levels. See Table 3A.
3, 4
XTAL_OUT,
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
5
FREQ_SEL Input Pulldown Frequency select pin. LVCMOS/LVTTL interface levels. See Table 3B.
6
GND
Power
Power supply ground.
7
Q0
Output
Single-ended clock output. LVCMOS/LVTTL interface levels.
15Ω output impedance.
8
V_DD
Power
Core supply pin.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
C_IN
C_PD
R_PULLUP
R_PULLDOWN
R_OUT
Parameter
Input Capacitance
Power Dissipation Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Output Impedance
Test Conditions
V_DD, V_DDA = 3.465V
Minimum
Typical
4
7
51
51
15
Maximum
Units
pF
pF
KΩ
KΩ
Ω
TABLE 3A. CONTROL FUNCTION TABLE
Control Input
OE
0
1
Output
Q0
Hi-Z
Active
TABLE 3B. FREQ_SEL FUNCTION TABLE
Control Input
FRE_SEL
0
1
N Divider
÷4 (default)
÷8
840051AG
www.icst.com/products/hiperclocks.html
2
REV. A JANUARY 14, 2005