PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840-77
77.76MH
Z
, LVCMOS/LVTTL
O
SCILLATOR
R
EPLACEMENT
Type
Power
Input
Input
Power
Power
Pullup
Description
Power supply pin.
Cr ystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
Output enable pin. When HIGH, outputs are enabled. When LOW,
forces outputs to HiZ state. LVCMOS/LVTTL interface levels.
Power supply ground.
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2, 3
4
5
6
Name
V
DD
XTAL_OUT,
XTAL_IN
OE
GND
V
DDO
Output supply pin.
Single-ended clock outputs. LVCMOS/LVTTL interface levels.
7, 8
Q0, Q1
Output
15
Ω
output impedence.
NOTE:
Pullup
refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
PULLUP
R
OUT
Parameter
Input Capacitance
Input Pullup Resistor
Output Impedance
Test Conditions
Minimum
Typical
4
51
15
Maximum
Units
pF
kΩ
Ω
T
ABLE
3. C
ONTROL
F
UNCTION
T
ABLE
Control Inputs
OE
0
1
Output
Q0, Q1
Hi-Z
Active
840AG-77
www.icst.com/products/hiperclocks.html
2
REV. A NOVEMBER 7, 2005
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
