No. 5743-11/23

LC72137, 72137M

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No.

Control block/data

Description

Related data

DO pin control data

• Data that determines DO pin output

DOC0, DOC1, DOC2

The open state is selected following a power-on reset.

Note: 1. end-UC: IF counter measurement completion check

ΠWhen end-UC is set and an IF count is started (CTE = 0

→ 1), the DO pin

automatically goes to the open state.

 When the IF count measurement completes, the DO pin goes low and

the count completion check operation is enabled.

Ž The DO pin goes to the open state due to serial data I/O (CE: high).

2. Goes to the open state if the IO pin itself is set to be an output port.

Caution: The DO pin always goes to the open state during the data input period (during the

period when CE is high in mode IN1 or IN2), regardless of the values of the DO pin

control data (DOC0 to DOC2). Also, the DO pin outputs the content of the internal

DO serial data in synchronization with the CL pin signal during the data output period

(during the period when CE is high in the OUT mode) regardless of the values of

the DO pin control data (DOC0 to DOC2).

Unlock detection data

• Selects the phase error (øE) detection range for PLL lock discrimination.

UL0, UL1

When a phase error greater than the specified range occurs, the LC72136N determines

that the PLL is unlocked. (*: Don’t care.)

Note: When unlocked, the DO pin goes low and the serial data output UL bit is 0.

Phase comparator

• Phase comparator dead zone control data

control data

DZ0, DZ1

Dead zone width: DZA < DZB < DZC < DZD

Clock time base

• An 8 Hz 40% duty clock time base signal can be output from BO1 by setting TBC to 1.

TBC

(The BO1 data will be ignored.)

Charge pump control data

• Data that forcibly controls the charge pump output

DLC

Note: The LC72137 provides a technique for escaping from deadlock by setting Vtune to

VCO oscillator being stopped by the VCO control voltage (Vtune) being 0 V.

(6)

(7)

(8)

(9)

(10)

UL0, UL1,

CTE,

IOC1, IOC2

DOC0,

DOC1,

DOC2

BO1

DOC2

DOC1

DOC0

DO pin state

0

0

0

Open

0

0

1

Low when the unlock state is detected

0

1

0

0

1

1

Open

1

0

0

Open

1

0

1

1

1

0

1

1

1

Open

UL1

UL0

øE detection width

Detector output

0

0

Stopped

Open

0

1

0

øE is output directly

1

*

±6.67 µs

øE is extended by 1 to 2 ms

DZ1

DZ0

Dead zone mode

0

0

DZA

0

1

DZB

1

0

DZC

1

1

DZD

DLC

Charge pump output

0

Normal operation

1

Forced low

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