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ICS84021 Datasheet, PDF (4/14 Pages) Integrated Circuit Systems – 260MHZ, CRYSTAL-TO-LVCMOS / LVTTL FREQUENCY SYNTHESIZER
Integrated
Circuit
Systems, Inc.
ICS84021
260MHZ, CRYSTAL-TO-LVCMOS / LVTTL
FREQUENCY SYNTHESIZER
TABLE 2. PIN CHARACTERISTICS
Symbol Parameter
CIN
Input Capacitance
CPD
Power Dissipation Capacitance
(per output)
RPULLUP Input Pullup Resistor
RPULLDOWN Input Pulldown Resistor
Test Conditions
VDD, VDDA, VDDO = 3.465V
VDD, VDDA = 3.465V, VDDO = 2.625V
VDD, VDDA = 3.465V, VDDO = 1.89V
Minimum
Typical
4
15
15
20
51
51
Maximum
Units
pF
pF
pF
pF
KΩ
KΩ
TABLE 3A. PARALLEL AND SERIAL MODE FUNCTION TABLE
MR nP_LOAD M
H
X
X
Inputs
N S_LOAD
X
X
S_CLOCK
X
S_DATA
X
Conditions
Reset. Forces outputs LOW.
L
L
Data Data
X
L
↑
Data Data
L
L
H
XX
L
L
H
XX
↑
X
X
Data on M and N inputs passed directly to the M
divider and N output divider. TEST output forced LOW.
X
X
Data is latched into input registers and remains loaded
until next LOW transition or until a serial event occurs.
↑
Data
Serial input mode. Shift register is loaded with data on
S_DATA on each rising edge of S_CLOCK.
L
Data
Contents of the shift register are passed to the
M divider and N output divider.
L
H
XX
↓
L
Data M divider and N output divider values are latched.
L
H
XX
L
X
X Parallel or serial input do not affect shift registers.
L
H
XX
H
↑
Data S_DATA passed directly to M divider as it is clocked.
NOTE: L = LOW
H = HIGH
X = Don't care
↑ = Rising edge transition
↓ = Falling edge transition
TABLE 3B. PROGRAMMABLE VCO FREQUENCY FUNCTION TABLE (NOTE 1)
VCO Frequency
(MHz)
M Divide
256
M8
128
M7
64
M6
32
M5
16
M4
8
M3
4
M2
2
M1
1
M0
625
25
0
0
0
0
1
1
0
0
1
•
•
•
•
•
•
•
•
•
•
•
700
28
0
0
0
0
1
1
1
0
0
•
•
•
•
•
•
•
•
•
•
•
775
31
0
0
0
0
1
1
1
1
1
NOTE 1: These M divide values and the resulting frequencies correspond to crystal or TEST_CLK input frequency
of 25MHz.
84021AY
www.icst.com/products/hiperclocks.html
4
REV. A NOVEMBER 7, 2003