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ICS8521 Datasheet, PDF (2/13 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER
◁
Integrated
Circuit
Systems, Inc.
ICS8521
LOW SKEW, 1-TO-9
DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
VDD
Power
Positive supply pin. Connect to 3.3V.
2
CLK
Input
Pulldown Non-inverting differential clock input.
3
nCLK
Input
Pullup Inverting differential clock input.
Clock select input. When HIGH, selects PCLK, nPCLK inputs.
4
CLK_SEL
Input
Pulldown When LOW, selects CLK, nCLK.
LVTTL / LVCMOS interface levels.
5
PCLK
Input
Pulldown Non-inverting differential LVPECL clock input.
6
nPCLK
Input
Pullup Inverting differential LVPECL clock input.
7
GND
Power
Power supply ground. Connect to ground.
8
9, 16, 17,
24, 25, 32
CLK_EN
VDDO
Input
Power
Pullup
Synchronizing clock enable. When HIGH, clock outputs follow
clock input. When LOW, Q outputs are forced low, nQ outputs
are forced high. LVCMOS /LVTTL interface levels.
Output supply pins. Connect to 1.8V.
10, 11
nQ8, Q8
Output
Differential output pair. LVHSTL interface level.
12, 13
nQ7, Q7
Output
Differential output pair. LVHSTL interface level.
14, 15
nQ6, Q6
Output
Differential output pair. LVHSTL interface level.
18, 19
nQ5, Q5
Output
Differential output pair. LVHSTL interface level.
20, 21
nQ4, Q4
Output
Differential output pair. LVHSTL interface level.
22, 23
nQ3 Q3
Output
Differential output pair. LVHSTL interface level.
26, 27
nQ2, Q2
Output
Differential output pair. LVHSTL interface level.
28, 29
nQ1, Q1
Output
Differential output pair. LVHSTL interface level.
30, 31
nQ0, Q0
Output
Differential output pair. LVHSTL interface level.
NOTE: Pullup and Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
R
PULLUP
RPULLDOWN
Parameter
Input Capacitance
CLK, nCLK,
PCLK, nPLCK
CLK_EN, CLK_SEL
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum Typical Maximum Units
4
pF
4
pF
51
KΩ
51
KΩ
8521BY
www.icst.com/products/hiperclocks.html
2
REV. B JULY 31, 2001
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