JPS6489834A - Clock input circuit - Google Patents

Clock input circuit

Info

Publication number
JPS6489834A
JPS6489834A JP62246879A JP24687987A JPS6489834A JP S6489834 A JPS6489834 A JP S6489834A JP 62246879 A JP62246879 A JP 62246879A JP 24687987 A JP24687987 A JP 24687987A JP S6489834 A JPS6489834 A JP S6489834A
Authority
JP
Japan
Prior art keywords
clock
level
signal
comparator
outputs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP62246879A
Other languages
Japanese (ja)
Other versions
JPH0671256B2 (en
Inventor
Koji Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP62246879A priority Critical patent/JPH0671256B2/en
Publication of JPS6489834A publication Critical patent/JPS6489834A/en
Publication of JPH0671256B2 publication Critical patent/JPH0671256B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Dc Digital Transmission (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To decide the presence or absence of a clock to be inputted signal and the propriety of frequency by providing a receiver, a band pass filter, a comparator and a rectifier circuit. CONSTITUTION:A receiver 1 outputs a clock of the same frequency as the input clock frequency in receiving a clock signal 6 of a specified level or above and outputs a prescribed constant level when the level of the input signal is a specified value or below. When the clock signal 6 is within the specified frequency range, the output level of the band pass filter 3 is larger than the threshold level of the comparator 4 and a clock subjected to waveform shaping is outputted as the output of the comparator 4. The rectifier circuit 5 outputs an H level signal when the clock 14 is a prescribed level or below and has a duty ratio, and when not, the L level signal is outputted. Thus, an internal circuit 8 recognizes whether or not the normal clock is to be received.
JP62246879A 1987-09-30 1987-09-30 Clock input circuit Expired - Lifetime JPH0671256B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62246879A JPH0671256B2 (en) 1987-09-30 1987-09-30 Clock input circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62246879A JPH0671256B2 (en) 1987-09-30 1987-09-30 Clock input circuit

Publications (2)

Publication Number Publication Date
JPS6489834A true JPS6489834A (en) 1989-04-05
JPH0671256B2 JPH0671256B2 (en) 1994-09-07

Family

ID=17155099

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62246879A Expired - Lifetime JPH0671256B2 (en) 1987-09-30 1987-09-30 Clock input circuit

Country Status (1)

Country Link
JP (1) JPH0671256B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06177720A (en) * 1992-08-04 1994-06-24 Samsung Semiconductor Inc Duty-cycle control circuit of signal and supply method of clock signal provided with 50-% duty cycle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50151034A (en) * 1974-05-02 1975-12-04
JPS57145425A (en) * 1981-03-05 1982-09-08 Aisin Seiki Co Ltd Binary data regenerating device
JPS58144938U (en) * 1982-03-24 1983-09-29 富士通株式会社 Clock disconnection detection circuit
JPS58177057A (en) * 1982-04-09 1983-10-17 Nec Corp External clock detection and conversion circuit
JPS59126318A (en) * 1983-01-08 1984-07-20 Fujitsu Ltd Clock regenerating circuit
JPS6161536A (en) * 1984-08-31 1986-03-29 Fujitsu Ltd Timing pulse extracting circuit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50151034A (en) * 1974-05-02 1975-12-04
JPS57145425A (en) * 1981-03-05 1982-09-08 Aisin Seiki Co Ltd Binary data regenerating device
JPS58144938U (en) * 1982-03-24 1983-09-29 富士通株式会社 Clock disconnection detection circuit
JPS58177057A (en) * 1982-04-09 1983-10-17 Nec Corp External clock detection and conversion circuit
JPS59126318A (en) * 1983-01-08 1984-07-20 Fujitsu Ltd Clock regenerating circuit
JPS6161536A (en) * 1984-08-31 1986-03-29 Fujitsu Ltd Timing pulse extracting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06177720A (en) * 1992-08-04 1994-06-24 Samsung Semiconductor Inc Duty-cycle control circuit of signal and supply method of clock signal provided with 50-% duty cycle

Also Published As

Publication number Publication date
JPH0671256B2 (en) 1994-09-07

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