ICS840-77 Datasheet, PDF (2/9 Pages) Integrated Circuit Systems – 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS840-77
77.76MHZ, LVCMOS/LVTTL
OSCILLATOR REPLACEMENT
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
V
Power
DD
2, 3
XTAL_OUT,
XTAL_IN
Input
Power supply pin.
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
4
OE
Input
Pullup
Output enable pin. When HIGH, outputs are enabled. When LOW,
forces outputs to HiZ state. LVCMOS/LVTTL interface levels.
5
GND
Power
Power supply ground.
6
V_DDO
Power
7, 8
Q0, Q1
Output
Output supply pin.
Single-ended clock outputs. LVCMOS/LVTTL interface levels.
15Ω output impedence.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
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
TABLE 3. CONTROL FUNCTION TABLE
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