JPH03157950A - Semiconductor integrated circuit - Google Patents

Semiconductor integrated circuit

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Publication number
JPH03157950A
JPH03157950A JP1298022A JP29802289A JPH03157950A JP H03157950 A JPH03157950 A JP H03157950A JP 1298022 A JP1298022 A JP 1298022A JP 29802289 A JP29802289 A JP 29802289A JP H03157950 A JPH03157950 A JP H03157950A
Authority
JP
Japan
Prior art keywords
oscillation
signal
bit
output
tosc
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
JP1298022A
Other languages
Japanese (ja)
Other versions
JPH07109845B2 (en
Inventor
Kazuyoshi Ofuji
大藤 一嘉
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 JP1298022A priority Critical patent/JPH07109845B2/en
Publication of JPH03157950A publication Critical patent/JPH03157950A/en
Publication of JPH07109845B2 publication Critical patent/JPH07109845B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Testing Or Measuring Of Semiconductors Or The Like (AREA)
  • Tests Of Electronic Circuits (AREA)

Abstract

PURPOSE:To perform easily inspection of an oscillation frequency by a method wherein an oscillation circuit is provided with a self-checking circuit. CONSTITUTION:Relays 3 are shut, a vibrator 4, capacitors 5 and a resistor 6 are connected to an inverter 1 for oscillation use to obtain an oscillation signal of a constant cycle Tosc and the waveform of the signal is shaped by a buffer 7 for waveform shaping use, is given to an n-bit upcounter 8 and is counted by an enable signal CE to obtain an output pulse width PW=ToscX2<m-1>. Output of an oscillation circuit and asynchronous two-phase clocks phi1 and phi2 are made to synchronize with each other by means of a cascade connection of D type FFs(flip-flops) 10 and 11 and the time of the PW is operated by an m-bit upcounter 9 using the phi1. The countered value of the counter 9 is latched on an m-bit FF 12 by an output rise of the FF 11 to obtain the PW (the value of the FF 12)X(the value of the phi1). From both formulas, a signal to divide the frequency of an output signal of the oscillation circuit is sampled by the phi1 from a tester and the Tosc is known. Moreover, the Tosc is compared with the upper and lower limit values of an allowable error by m-bit comparators 13 and 14 and when the Tosc is within the range of the values, a flag is set up through an AND gate (IC output) 15 to verify a normal operation and the inspection is finished.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は半導体集積回路(IC)に係シ、特にLSII
を用いた製品検査工程において検査される水晶振動子発
振回路やセラミック振動子発振回路OR発振回路等を含
むICに関する。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to semiconductor integrated circuits (ICs), particularly LSII
The present invention relates to an IC including a crystal resonator oscillation circuit, a ceramic resonator oscillation circuit, an OR oscillation circuit, etc., which are inspected in a product inspection process using the IC.

〔従来の技術〕[Conventional technology]

従来、LSIテスタを用いた発振回路の検査は作業効率
・量産性の観点から、発振回路部のブロックを単なるイ
ンバータとみなして、ファンクションの確認、及び出力
電流などのDC特性検査のみを行うことが多かった。
Conventionally, when testing oscillator circuits using an LSI tester, from the viewpoint of work efficiency and mass productivity, it was possible to treat the oscillation circuit block as a simple inverter and only check the function and DC characteristics such as output current. There were many.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかし、従来のLSIテスタを用いた検査方法では、発
振回路ブロックが論理動作上、DC特性上正常であるこ
とが確認されても、実際に振動子等を付けた時に期待ど
おシの周波数や電圧で発振する保障がなく、その確認が
行われていなかった。
However, with conventional testing methods using LSI testers, even if it is confirmed that the oscillation circuit block is normal in terms of logic operation and DC characteristics, the expected frequency and There was no guarantee that the voltage would cause oscillation, and this had not been confirmed.

これを行う方法としては、従来では、振動子やコンデン
サ、抵抗等を付け、実際に発振回路を構成し、その出力
をオシロスコープや周波数カウンタ等で波形観測して検
査を行っていた。しかし、この検査はLSIテスタ自体
に周波数カウンタ等の機能を持っていないので、LSI
テスタを用いた通常のICの機能検査とは別にやらなけ
ればならず、そのため時間や工数が多くかかシ、量産に
は向かないという欠点があった。
Conventionally, this has been done by actually constructing an oscillation circuit by attaching a vibrator, capacitor, resistor, etc., and observing the waveform of its output using an oscilloscope, frequency counter, etc. for inspection. However, this test is performed because the LSI tester itself does not have functions such as a frequency counter.
This method had the disadvantage that it had to be carried out separately from the normal IC function test using a tester, and therefore required a lot of time and man-hours, making it unsuitable for mass production.

本発明の目的は、前記欠点が解決され、発振周波数の検
査が極めて容易に行えるようにした半導体集積回路を提
供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a semiconductor integrated circuit in which the above-mentioned drawbacks are solved and the oscillation frequency can be tested extremely easily.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の構成は、発振回路を含む半導体集積回路におい
て、前記発振回路を自己診断する回路を備えたことを特
徴とする。
The structure of the present invention is characterized in that a semiconductor integrated circuit including an oscillation circuit includes a circuit for self-diagnosing the oscillation circuit.

〔実施例〕〔Example〕

次に図面を参照しながら本発明を説明する。 Next, the present invention will be explained with reference to the drawings.

第1図は本発明の一実施例の半導体集積回路を示す回路
ブロック図、第2図社第1図の動作波形図である。
FIG. 1 is a circuit block diagram showing a semiconductor integrated circuit according to an embodiment of the present invention, and an operational waveform diagram of FIG. 1 of FIG. 2.

第1図、第2図において、本実施例は、振動子4、コン
デンサ5.抵抗6.リレー31発振用インバータ1を有
する発振回路と、他ブロツク部2と、カウンタ8,9.
フリップフロップ10,11゜12.16と、mビット
コンパレータ13,14等を有する自己診断回路とを同
−半導体集積回路上に含み、構成される。
1 and 2, in this embodiment, a vibrator 4, a capacitor 5. Resistance 6. An oscillation circuit having a relay 31 and an oscillation inverter 1, other block sections 2, counters 8, 9 .
The self-diagnosis circuit includes flip-flops 10, 11, 12, 16, m-bit comparators 13, 14, etc. on the same semiconductor integrated circuit.

発振インバータ1の検査は、IC上の他ブロツク部2と
は別に行う。先ず、LSIテスタの検査ボード(図示せ
ず)上に載っているリレー3を導通(ON)状態にし、
同じくボード上に載っている振動子4.2個のコンデン
サ5、抵抗6と発振インバータ1とを接続し、発振回路
を構成する。
The oscillation inverter 1 is tested separately from other blocks 2 on the IC. First, the relay 3 mounted on the inspection board (not shown) of the LSI tester is turned on (ON).
A vibrator 4, two capacitors 5, a resistor 6, and an oscillation inverter 1, which are also mounted on the board, are connected to form an oscillation circuit.

そして、ICのVDD電源端子(図示せず)に電圧を印
加することによシ、発振を開始させる。ある一定時間後
、発振周波数は振動子4によって決まる略一定周波数に
なる。この発振信号は、波形整形用バッファ7を介し、
他ブロツク部2へ伝るとともに、nビットアップカウン
タ8のクロック(CLK)入力に入力される。そして、
このカウンタ8のクロックイネーブル(CE)がノ・イ
レベルになると、この発振信号はカウンタ8でカウント
される。従って、このnビットアップカウンタ8のMO
B出力のハイレベル出力パルス幅PWは、発振回路の発
振周期をToscとすると、次の(1)式と表る。
Oscillation is then started by applying a voltage to the VDD power supply terminal (not shown) of the IC. After a certain period of time, the oscillation frequency becomes a substantially constant frequency determined by the vibrator 4. This oscillation signal is passed through a waveform shaping buffer 7,
The signal is transmitted to the other block section 2 and is also input to the clock (CLK) input of the n-bit up counter 8. and,
When the clock enable (CE) of this counter 8 reaches the no-low level, this oscillation signal is counted by the counter 8. Therefore, the MO of this n-bit up counter 8
The high-level output pulse width PW of the B output is expressed by the following equation (1), where Tosc is the oscillation period of the oscillation circuit.

PW= ’rosc X 2(”1) ・・・・・・・
・・・・・・・・・・・(1)但し、電源電圧印加後に
、リセツ)(RE8ET)信号を一度入力することによ
シ、カウンタ8.フリップ・フロップ10等は、カウン
ト前に、リセットしておく必要がある。ここで、信号φ
1.φ2は、LSIテスタからインバータを介して与え
られる2相クロツク(クロック1.クロック2)信号で
、このクロック信号Φ1を用い1mビットカウンタ9で
、カウンタ8のMOB出力出力スルフ幅間を計算する。
PW='rosc X 2("1)...
(1) However, by inputting the reset (RE8ET) signal once after applying the power supply voltage, the counter 8. The flip-flop 10 etc. must be reset before counting. Here, the signal φ
1. φ2 is a two-phase clock (clock 1, clock 2) signal given from the LSI tester via an inverter. Using this clock signal φ1, the 1m-bit counter 9 calculates the MOB output sulf width of the counter 8.

LSIテスタからのクロック信号φ1゜φ2は、発振回
路の出力信号と、非同期なので、2個のDタイプのフリ
ップ・フロップ10.11は、この様にカスケード接続
することによシ、同期を取っている。mビットカウンタ
9でカウントされた値は、第3図に示すフリップ・フロ
ップ11の出力信号の立ち上がりで、mビットフリップ
・フロップ12にラッチされる。従って、mビットフリ
ップ・フロップ12の値は、次の(2)式で表わせる様
になる。
Since the clock signals φ1 and φ2 from the LSI tester are asynchronous with the output signal of the oscillation circuit, the two D-type flip-flops 10 and 11 are synchronized by cascading them in this way. There is. The value counted by the m-bit counter 9 is latched into the m-bit flip-flop 12 at the rising edge of the output signal of the flip-flop 11 shown in FIG. Therefore, the value of the m-bit flip-flop 12 can be expressed by the following equation (2).

(nビットカウンタ8のMSB出力)(ルス幅)#(m
ビットクリップ・フロップ12の値)×(φ1の周期)
        ・・・(2)前記(1) 、 (2)
式よj5.LSIテスタよりのクロック信号φ1で、発
振回路の出力信号を分周した信号をサンプリングするこ
とによシ、発振回路の発5− 振周波数を求めることが可能なことがわかる。mビット
フリップ・フロップ120値は発振周波数の誤差や、サ
ンプリング時の誤差、非同期信号をLSIテスタと同期
した信号に変換する時の誤差などによシ、若干誤差を生
じる。mビットコンパレータ13,14は、予め設定し
ておいたこの誤差の許容できる上限値、下限値とmビッ
ト・スリップ・フロップ12の出力値との大小を比較し
、もし上限値と下限値との間に、mビットフリップ・フ
ロップ12の値が入っているなら、発振回路は正常な周
波数で発振しているとし、AND回路を介し、出力15
にフラグを立てる。LSIテスタはこのフラグを読み込
み、発振回路が正常に動作していることを確認し、発振
回路の検査を終了する。
(MSB output of n-bit counter 8) (Russ width) #(m
Bit clip flop 12 value) x (period of φ1)
...(2) Above (1), (2)
Expression j5. It can be seen that the oscillation frequency of the oscillation circuit can be determined by sampling a signal obtained by frequency-dividing the output signal of the oscillation circuit using the clock signal φ1 from the LSI tester. The value of the m-bit flip-flop 120 has some errors due to errors in the oscillation frequency, errors in sampling, errors in converting an asynchronous signal to a signal synchronized with the LSI tester, etc. The m-bit comparators 13 and 14 compare the preset allowable upper and lower limits of this error with the output value of the m-bit slip-flop 12, and if the upper and lower limits are different, If the value of m-bit flip-flop 12 is entered in between, it is assumed that the oscillation circuit is oscillating at a normal frequency, and the output 15 is output through the AND circuit.
flag. The LSI tester reads this flag, confirms that the oscillation circuit is operating normally, and finishes testing the oscillation circuit.

尚、LSIテスタは、リセット信号、クロック・イネー
ブル信号が得られ、リセット信号はバッファを介してカ
ウンタ8,9フリツプ・フロップ10.11,12.1
6に与えられ、後者の信号もバッファを介してフリップ
・フロップ10に与えら6− れる。
Note that the LSI tester can obtain a reset signal and a clock enable signal, and the reset signal is passed through a buffer to the counters 8, 9 and flip-flops 10.11, 12.1.
The latter signal is also applied to flip-flop 10 via a buffer.

第2図は本発明の他の実施例の半導体集積回路の回路図
である。
FIG. 2 is a circuit diagram of a semiconductor integrated circuit according to another embodiment of the present invention.

第2図において、本実施例は基本的には第1図と同様で
あるので、異なる部分のみ説明を行う。
In FIG. 2, since this embodiment is basically the same as that in FIG. 1, only the different parts will be explained.

第1図のnビットアップカウンタ8の代わシに、本実施
例はnビットダウンカウンタ16を用いる。
In place of the n-bit up counter 8 of FIG. 1, this embodiment uses an n-bit down counter 16.

これによシ、カウンタ16のクロック・イネーブル(C
E)入力がハイレベルになると、MOB出力はすぐにハ
イレベルとなる。もし、電源電圧印加時から、CE大入
力ハイレベルになるまでの時間が短く、まだ正常な発振
周波数で発振していないなら、カウンタ16のMOB出
力ハイレベルパルス幅が変ってしまう。これによシ後段
でのチエツクで異常発振と判定されてしまう。つまシ、
カウンタをダウンカウンタに代えることによシ、発振開
始時間のチエツクも可能となシ、またコンパレータ17
,18の上限値、下限値を予めIC内に設定しておくの
ではなくて、ICの外部から、つま、9LSIテスタよ
シ与えることができるようにしておくことにより、発振
周波数の変更や発振精度のよシ高い製品の選別などが可
能である。
This also enables the counter 16 clock enable (C
E) When the input goes high, the MOB output goes high immediately. If the time from when the power supply voltage is applied until the CE large input becomes high level is short and oscillation is not yet at the normal oscillation frequency, the MOB output high level pulse width of the counter 16 will change. This causes abnormal oscillation to be determined in a check at a later stage. Tsumashi,
By replacing the counter with a down counter, it is also possible to check the oscillation start time.
, 18 upper and lower limits are not set in advance in the IC, but can be applied from outside the IC to the 9LSI tester, thereby changing the oscillation frequency and controlling the oscillation. It is possible to select products with high precision.

以上本発明の実施例によれは、実際に使用する発振回路
素子(振動子や、コンデンサ、抵抗等)を用いて発振さ
せ、その発振周波数のチエツクをICに内賦されている
自己診断回路で行うことによfi、LSIテスタで発振
回路の良否が容易に判定できる。
According to the embodiments of the present invention, the oscillation circuit elements actually used (vibrators, capacitors, resistors, etc.) are used to oscillate, and the oscillation frequency is checked by a self-diagnosis circuit built into the IC. By doing this, the quality of the oscillation circuit can be easily determined using an LSI tester.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明は、実際の発振回路に用い
る振動子や受動素子を用いてLSIテスタ上で検査が行
えるから、次の様な効果がある。
As explained above, the present invention has the following effects because it can be tested on an LSI tester using vibrators and passive elements used in actual oscillation circuits.

(1)従来、LSIテスタで行っていたファンクション
・テスト、DCIrf性チエツクのみの検査に比べ、信
頼性が向上する。
(1) Reliability is improved compared to testing using only function tests and DCIrf checks, which were conventionally performed using LSI testers.

(11)従来は実使用素子を用いて検査を行うためには
LSIテスタのチエツクとは別に、もう−度別基板で検
査を行う必要があったが、本発明はLSIテスタ上で同
時に行うので、検査の短時間化、省工数化が可能である
(11) Conventionally, in order to test using actually used elements, it was necessary to perform the test on a separate board in addition to the check on the LSI tester, but with the present invention, the test can be performed simultaneously on the LSI tester. , it is possible to shorten the inspection time and reduce the number of man-hours.

(iii)  L S Iテスタのプログラムの簡単な
変更で、発振開始時is!j−’P発振開始電圧も容易
に検査でき、製品の信頼性向上が望める。
(iii) With a simple change to the LSI tester program, IS! when oscillation starts! The j-'P oscillation starting voltage can also be easily tested, and product reliability can be improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例の半導体集積回路を示す回路
図、第2図は本発明の他の実施例の半導体集積回路を示
す回路図、第3図は第1図の信号波形を示す動作波形図
である。 1・・・発振用インバータ、2・・・ICに搭載されて
いる他ブロツク部、3・・・リレー 4・・・′振動子
、5・・・コンデンサ、6・・・抵抗、7・・・波形整
形用バッファ、8・・・nビットアップカウンタ、9・
・・nビットアップカウンタ、10.11・・・Dタイ
プ・フリップ・フロップ、12・・・mビット・フリッ
プ・70ツブ、13.14・・・mビットコンパレータ
、15・・・IC出力、16・・・nビットタウンカウ
ンタ。
FIG. 1 is a circuit diagram showing a semiconductor integrated circuit according to one embodiment of the invention, FIG. 2 is a circuit diagram showing a semiconductor integrated circuit according to another embodiment of the invention, and FIG. 3 shows the signal waveforms of FIG. 1. FIG. 1... Oscillation inverter, 2... Other blocks mounted on the IC, 3... Relay 4...' vibrator, 5... Capacitor, 6... Resistor, 7...・Waveform shaping buffer, 8...n-bit up counter, 9.
...n-bit up counter, 10.11...D type flip-flop, 12...m-bit flip 70 tube, 13.14...m-bit comparator, 15...IC output, 16 ...n-bit town counter.

Claims (1)

【特許請求の範囲】[Claims] 発振回路を含む半導体集積回路において、前記発振回路
を自己診断する回路を備えたことを特徴とする半導体集
積回路。
1. A semiconductor integrated circuit including an oscillation circuit, comprising a circuit for self-diagnosing the oscillation circuit.
JP1298022A 1989-11-15 1989-11-15 Semiconductor integrated circuit Expired - Lifetime JPH07109845B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1298022A JPH07109845B2 (en) 1989-11-15 1989-11-15 Semiconductor integrated circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1298022A JPH07109845B2 (en) 1989-11-15 1989-11-15 Semiconductor integrated circuit

Publications (2)

Publication Number Publication Date
JPH03157950A true JPH03157950A (en) 1991-07-05
JPH07109845B2 JPH07109845B2 (en) 1995-11-22

Family

ID=17854103

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1298022A Expired - Lifetime JPH07109845B2 (en) 1989-11-15 1989-11-15 Semiconductor integrated circuit

Country Status (1)

Country Link
JP (1) JPH07109845B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07104037A (en) * 1993-10-07 1995-04-21 Nec Corp Semiconductor integrated circuit
KR100271259B1 (en) * 1997-03-26 2000-12-01 가네꼬 히사시 Semiconductor integrated circuit and its evaluating method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57197831A (en) * 1981-05-29 1982-12-04 Nec Corp Integration circuit chip
JPS603135A (en) * 1983-06-21 1985-01-09 Nec Corp Semiconductor memory circuit device
JPH01185963A (en) * 1988-01-21 1989-07-25 Nec Corp Semiconductor integrated circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57197831A (en) * 1981-05-29 1982-12-04 Nec Corp Integration circuit chip
JPS603135A (en) * 1983-06-21 1985-01-09 Nec Corp Semiconductor memory circuit device
JPH01185963A (en) * 1988-01-21 1989-07-25 Nec Corp Semiconductor integrated circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07104037A (en) * 1993-10-07 1995-04-21 Nec Corp Semiconductor integrated circuit
KR100271259B1 (en) * 1997-03-26 2000-12-01 가네꼬 히사시 Semiconductor integrated circuit and its evaluating method

Also Published As

Publication number Publication date
JPH07109845B2 (en) 1995-11-22

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