ICS8535-11 Datasheet, PDF (2/14 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/ LVCMOS-TO-3.3V LVPECL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
ICS8535-11
LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/
LVCMOS-TO-3.3V LVPECL FANOUT BUFFER
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
V_EE
Power
Negative supply pin. Connect to ground.
Synchronizing clock enable. When HIGH, clock outputs follows clock
2
CLK_EN
Input
Pullup input. When LOW, Q outputs are forced low, nQ outputs are forced
high. LVCMOS / LVTTL interface levels.
3
CLK_SEL
Input
Pulldown
Clock select input. When HIGH, selects CLK input. When LOW,
selects XTAL inputs. LVCMOS / LVTTL interface levels.
4
CLK
Input Pulldown Non-inverting LVCMOS / LVTTL clock input.
5, 8, 9
nc
Unused
No connect.
6
XTAL1
Input Pulldown Crystal oscillator input.
7
XTAL2
Input
Pullup Crystal oscillator input.
10, 13, 18
11, 12
V_CC
nQ3, Q3
Power
Output
Positive supply pins. Connect to 3.3V.
Differential clock outputs. LVPECL interface levels.
14, 15
nQ2, Q2
Output
Differential clock outputs. LVPECL interface levels.
16, 17
nQ1, Q1
Output
Differential clock outputs. LVPECL interface levels.
19, 20
nQ0, Q0
Output
Differential clock outputs. LVPECL interface levels.
NOTE: Pullup and Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
C_IN
R_PULLUP
R_PULLDOWN
Parameter
CLK
Input Capacitance
CLK_EN, CLK_SEL
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
51
51
Maximum
4
4
Units
pF
pF
KΩ
KΩ
8535AG-11
www.icst.com/products/hiperclocks.html
2
REV. B JULY 27, 2001