Integrated
Circuit
Systems, Inc.
ICS8442
700MH
Z
, C
RYSTAL
O
SCILLATOR
-
TO
-D
IFFERENTIAL
LVDS F
REQUENCY
S
YNTHESIZER
Type
Input
Input
Input
Unused
Power
Output
Power
Output
Output
Pullup
M divider inputs. Data latched on LOW-to-HIGH transistion
Pulldown of nP_LOAD input. LVCMOS / LVTTL interface levels.
Pulldown
Determines output divider value as defined in Table 3C
Function Table. LVCMOS / LVTTL interface levels.
No connect.
Power supply ground.
Test output which is ACTIVE in the serial mode of operation. Output
driven LOW in parallel mode. LVCMOS / LVTTL interface levels.
Core supply pins.
Differential output for the synthesizer. LVDS interface levels.
Differential output for the synthesizer. LVDS interface levels.
Active High Master Reset. When logic HIGH, the internal dividers
are reset causing the true outputs FOUTx to go low and the inver ted
outputs nFOUTx to go high. When logic LOW, the internal dividers
and the outputs are enabled. Asser tion of MR does not effect loaded
M, N, and T values. LVCMOS / LVTTL interface levels.
Clocks in serial data present at S_DATA input into the shift register
on the rising edge of S_CLOCK. LVCMOS / LVTTL interface levels.
Shift register serial input. Data sampled on the rising edge
of S_CLOCK. LVCMOS / LVTTL interface levels.
Controls transition of data from shift register into the dividers.
LVCMOS / LVTTL interface levels.
Analog supply pin.
Selects between cr ystal oscillator or test inputs as the PLL reference
source. Selects XTAL inputs when HIGH. Selects TEST_CLK when
LOW. LVCMOS / LVTTL interface levels.
Test clock input. LVCMOS / LVTTL interface levels.
Description
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2, 3, 4,
28, 29,
30, 31, 32
5, 6
7
8, 16
9
10, 13
11, 12
1 4, 15
Name
M5
M6, M7, M8,
M0, M1,
M2, M3, M4
N0, N1
nc
GND
TEST
V
DD
FOUT1, nFOUT1
FOUT0, nFOUT0
17
MR
Input
Pulldown
18
19
20
21
22
23
24, 25
26
27
S_CLOCK
S_DATA
S_LOAD
V
DDA
XTAL_SEL
TEST_CLK
XTAL1, XTAL2
nP_LOAD
VCO_SEL
Input
Input
Input
Power
Input
Input
Input
Input
Input
Pulldown
Pulldown
Pulldown
Pullup
Pulldown
Cr ystal oscillator interface. XTAL1 is the input XTAL2 is the output.
Parallel load input. Determines when data present at M8:M0 is
Pulldown loaded into M divider, and when data present at N1:N0 sets the
N output divider value. LVCMOS / LVTTL interface levels.
Determines whether synthesizer is in PLL or bypass mode.
Pullup
LVCMOS / LVTTL interface levels.
NOTE:
Pullup
and
Pulldown
refer 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
PULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
KΩ
KΩ
8442AY
www.icst.com/products/hiperclocks.html
3
REV. C JULY 8, 2004
ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
