8430I-61 DATA SHEET
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
28, 29, 30
31, 32, 1, 2 M3, M4, M5, M6
M0, M1, M2
Input Pulldown
M divider inputs. Data latched on LOW-to-HIGH transition of nP_
LOAD input. LVCMOS / LVTTL interface levels.
3, 4
M7, M8
Input
Pullup
5, 7
6
N0, N2
N1
Input Pulldown
Determines output divider value as defined in Table 3C,
Function Table. LVCMOS / LVTTL interface levels.
Input
Pullup
8, 16
VEE
Power
Negative supply pins.
Test output which is ACTIVE in the serial mode of operation.
Output driven LOW in parallel mode. LVCMOS interface levels.
9
TEST
VCC
Output
Power
10
Core supply pin.
11, 12
13
FOUT1, nFOUT1 Output
VCCO Power
FOUT0, nFOUT0 Output
Differential output for the synthesizer. LVPECL interface levels.
Output supply pin for LVPECL outputs.
14, 15
Differential output for the synthesizer. LVPECL interface levels.
Active High Master Reset. When logic HIGH, the internal dividers are
reset causing the true outputs FOUTx to go low and the inverted out-
17
MR
Input Pulldown puts 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.
18
19
S_CLOCK
S_DATA
Input Pulldown
Shift register serial input. Data sampled on the rising edge
of S_CLOCK. LVCMOS / LVTTL interface levels.
Input Pulldown
Controls transition of data from shift register into the dividers. LVC-
MOS / LVTTL interface levels.
20
21
S_LOAD
VCCA
Input Pulldown
Power
Input
Analog supply pin.
Selects between crystal oscillator or test inputs as the PLL reference
Pullup source. Selects XTAL inputs when HIGH. Selects TEST_CLK when
LOW. LVCMOS / LVTTL interface levels.
22
23
XTAL_SEL
TEST_CLK
Input Pulldown Test clock input. LVCMOS / LVTTL interface levels.
24,
25
XTAL_OUT, XTAL_
IN
Crystal oscillator interface. XTAL_IN is the input.
XTAL_OUT is the output.
Input
Parallel load input. Determines when data present at M8:M0 is loaded
26
nP_LOAD
Input Pulldown into M divider, and when data present at N2:N0 sets the
N output divider value. LVCMOS / LVTTL interface levels.
Determines whether synthesizer is in PLL or bypass mode. LVCMOS
/ LVTTL interface levels.
27
VCO_SEL
Input
Pullup
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
Parameter
Test Conditions
Minimum Typical Maximum Units
Input Capacitance
Input Pullup Resistor
4
pF
kΩ
kΩ
RPULLUP
51
51
RPULLDOWN Input Pulldown Resistor
REVISION D 10/15/15
3
500MHZ, CRYSTAL-TO-3.3V, 2.5V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER