Fujitsu MB15F74UV 사용자 설명서
MB15F74UV
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PIN DESCRIPTION
Pin no.
Pin
name
I/O
Descriptions
1
GND
Ground pin for OSC input buffer and the shift register circuit.
2
fin
IF
I
Prescaler input pin for the IF-PLL.
Connection to an external VCO should be AC coupling.
Connection to an external VCO should be AC coupling.
3
Xfin
IF
I
Prescaler complimentary input for the IF-PLL section.
This pin should be grounded via a capacitor.
This pin should be grounded via a capacitor.
4
GND
IF
Ground pin for the IF-PLL section.
5
V
CCIF
Power supply voltage input pin for the IF-PLL section, the shift register and the oscillator
input buffer.
input buffer.
6
Do
IF
O
Charge pump output for the IF-PLL section.
7
PS
IF
I
Power saving mode control pin for the IF-PLL section. This pin must be set at “L” when
the power supply is started up. (Open is prohibited.)
PS
the power supply is started up. (Open is prohibited.)
PS
IF
=
“H” ; Normal mode/PS
IF
=
“L” ; Power saving mode
8
LD/fout O
Lock detect signal output (LD) /phase comparator monitoring output (fout) pin. The out-
put signal is selected by LDS bit in a serial data.
LDS bit
put signal is selected by LDS bit in a serial data.
LDS bit
=
“H” ; outputs fout signal/LDS bit
=
“L” ; outputs LD signal
9
PS
RF
I
Power saving mode control for the RF-PLL section. This pin must be set at “L” when the
power supply is started up. (Open is prohibited. )
PS
power supply is started up. (Open is prohibited. )
PS
RF
=
“H” ; Normal mode/PS
RF
=
“L” ; Power saving mode
10
Do
RF
O
Charge pump output for the RF-PLL section.
11
V
CCRF
Power supply voltage input pin for the RF-PLL section.
12
GND
RF
Ground pin for the RF-PLL section
13
Xfin
RF
I
Prescaler complimentary input pin for the RF-PLL section.
This pin should be grounded via a capacitor.
This pin should be grounded via a capacitor.
14
fin
RF
I
Prescaler input pin for the RF-PLL.
Connection to an external VCO should be via AC coupling.
Connection to an external VCO should be via AC coupling.
15
LE
I
Load enable signal input pin (with the schmitt trigger circuit)
When LE is set “H”, data in the shift register is transferred to the corresponding latch ac-
cording to the control bit in a serial data.
When LE is set “H”, data in the shift register is transferred to the corresponding latch ac-
cording to the control bit in a serial data.
16
Data
I
Serial data input pin (with the schmitt trigger circuit)
Data is transferred to the corresponding latch (IF-ref. counter, IF-prog. counter,
RF-ref. counter, RF-prog. counter) according to the control bit in a serial data.
Data is transferred to the corresponding latch (IF-ref. counter, IF-prog. counter,
RF-ref. counter, RF-prog. counter) according to the control bit in a serial data.
17
Clock
I
Clock input pin for the 23-bit shift register (with the schmitt trigger circuit)
One bit data is shifted into the shift register on a rising edge of the clock.
One bit data is shifted into the shift register on a rising edge of the clock.
18
OSC
IN
I
The programmable reference divider input pin. TCXO should be connected with an AC
coupling capacitor.
coupling capacitor.