3
MB15C02
■PIN DESCRIPTIONS
(Continued)
Pin no. Pin
name I/O Descriptions
SSOP
16 SSOP
20
1 1 VDD –Power supply voltage
2 2 Clock IClock input for the shift register.(Schmitt trigger input)
Data is shifted into the shift register on the rising edge of the clock.
– 3 NC –No connection
3 4 Data ISerial data input using binary code.(Schmitt trigger input)
4 5 LE ILoad enable signal input (Schmitt trigger input)
When LE is high, the data in the shift register is transferred to a latch,
according to the control bit in the serial data.
5 6 fin I Presc aler input.
A bias circuit and amplifier are at input port. Connection with an external
VCO should be done by AC coupling.
6 7 PS IPower saving mode control. This pin must be set at “L” at Power-ON.
PS = “H” ; Normal mode
PS = “L” ; Power saving mode
– 8 NC –No connection
7 9 LD OLock detector signal output.
When a PLL is locking, LD outputs “H”.
When a PLL is not locking, LD outputs “L”.
810 Do O
Charge pump output.
Phase of the charge pump can be reversed by FC input. The Do output
may be inverted by FC input. The relationships between the programmable
reference divider output (fr) and the programmable divider output (fp) are
shown below;
fr > fp :“H” level (FC = “L”), “L” level (FC = “H”)
fr = fp : High impedance
fr < fp :“L” level (FC = “L”), “H” level (FC = “H”)
911 Vp –Power supply for the charge pump.
10 12 φR O
Phase comparator output pin (for external charge pump). Relation between
the programmable reference divider output (fr) and the prog rammable divider
output (fp) are shown below;
When FC = “L”
fr > fp : φR = “L” level, φP = “L” level
fr = fp : φR = “L” level, φP = High impedance
fr < fp : φR = “H” level, φP = High impedance
When FC = “H”
fr > fp : φR = “H” level, φP = High impedance
fr = fp : φR = “L” level, φP = High impedance
fr < fp : φR = “L” level, φP = “L” level
–13 NC –No connection
11 14 φP O Phase comparator output pin (for external charge pump). Refer to Pin
description for φR. φP pin is a Nch open drain output.
12 15 FC IPhase comparator input select pin.
13 16 TEST ITest mode select pin. (Pull down resistor)
Please set this pin to ground or open usually.