ICS8430-71B Datasheet, PDF (3/16 Pages) Integrated Circuit Systems – 700MHZ, LOW JITTER, CRYSTAL INTERFACE / LVCMOS-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS8430B-71
700MHZ, LOW JITTER, CRYSTAL INTERFACE/
LVCMOS-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1, 2, 3,
28, 29, 30
31, 32
4
M5, M6, M7,
M0, M1, M2,
M3, M4
M8
Input
Input
Pulldown _{M divider inputs. Data latched on LOW-to-HIGH transition of}
nP_LOAD input. LVCMOS / LVTTL interface levels.
Pullup
5, 6
N0, N1
Input Pulldown _{Determines output divider value as defined in Table 3C}
7
N2
Input
Pullup ^{Function Table. LVCMOS / LVTTL interface levels.}
8, 16
9
V_EE
TEST
Power
Output
Negative supply pins.
Test output which is ACTIVE in the serial mode of operation.
Output driven LOW in parallel mode. LVCMOS/LVTTL interface levels.
10
11, 12
V_CC
FOUT1,
nFOUT1
Power
Output
Core power supply pin.
Differential output for the synthesizer. 3.3V LVPECL interface levels.
13
14, 15
17
18
19
20
V_CCO
FOUT0,
nFOUT0
MR
S_CLOCK
S_DATA
S_LOAD
Power
Output
Input
Input
Input
Input
Output supply pin.
Differential output for the synthesizer. 3.3V LVPECL interface levels.
Pulldown
Pulldown
Pulldown
Pulldown
Active High Master reset. When logic HIGH, the internal dividers are
reset causing the true outputs (FOUTx) to go low and the inverted
outputs (nFOUTx) to go high. When Logic LOW, the internal dividers
and the outputs are enabled. Assertion of MR does not affect 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.
21
V_CCA
Power
Analog supply pin.
Selects between the crystal oscillator or test clock as the
22
XTAL_SEL
Input Pullup PLL reference source. Selects XTAL inputs when HIGH.
Selects TEST_CLK when LOW. LVCMOS / LVTTL interface levels.
23
TEST_CLK
Input Pulldown Test clock input. LVCMOS interface levels.
24,
25
XTAL_OUT,
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input.
XTAL_OUT is the output.
Parallel load input. Determines when data present at M8:M0 is
26
nP_LOAD
Input Pulldown loaded into the M divider, and when data present at N2:N0 sets the
N output divider value. LVCMOS / LVTTL interface levels.
27
VCO_SEL
Input
Pullup
Determines whether synthesizer is in PLL or bypass mode.
LVCMOS / LVTTL interface levels.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
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
8430BY-71
www.icst.com/products/hiperclocks.html
3
REV. A SEPTEMBER 20, 2005