JPH03263689A - Semiconductor integrated circuit - Google Patents

Semiconductor integrated circuit

Info

Publication number
JPH03263689A
JPH03263689A JP2063035A JP6303590A JPH03263689A JP H03263689 A JPH03263689 A JP H03263689A JP 2063035 A JP2063035 A JP 2063035A JP 6303590 A JP6303590 A JP 6303590A JP H03263689 A JPH03263689 A JP H03263689A
Authority
JP
Japan
Prior art keywords
power supply
data
serial memory
voltage
field effect
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.)
Pending
Application number
JP2063035A
Other languages
Japanese (ja)
Inventor
Masahiko Ishikawa
石川 昌彦
Yoshio Fudeyasu
筆保 吉雄
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2063035A priority Critical patent/JPH03263689A/en
Publication of JPH03263689A publication Critical patent/JPH03263689A/en
Pending legal-status Critical Current

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  • Dram (AREA)
  • Static Random-Access Memory (AREA)

Abstract

PURPOSE:To facilitate the transfer of a voltage and to quicken the access time by incorporating a power changeover circuit switching a power voltage of a latch section to a serial memory into an external power supply and an internal voltage drop power supply whose voltage is lower than the voltage of the external power supply. CONSTITUTION:A data sensed by a sense amplifier 4 is written in a serial memory 3 by using a WDT control signal and read to an I/O data bus line by an RDT signal. When an 'L' NO data is stored in a serial memory 3 and an 'H' data is written in the memory and transferred to the I/O data bus line, a control signal phi is brought into an 'L', a p-channel field effect transistor (TR) p-TR is turned on and an n-channel field effect TR n-T2 is turned off. Since no voltage drop is caused in the p-channel field effect Tr p-TR because of the p-channel TR, the power voltage is directly connected to an external power supply Vcc. Thus, the data is transferred without deteriorating the drive capability, then the transfer is facilitated, the drive capability of the data bus is improved and the accessing is quickened.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、半導体集積回路に関するもので、特にセン
スアンプからシリアルメモリへのデータ転送に関するも
のである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a semiconductor integrated circuit, and particularly to data transfer from a sense amplifier to a serial memory.

〔従来の技術〕[Conventional technology]

第2図は従来の半導体集積回路を示すものであり、この
図で、1はN型MoSトランジスタ、2はP型MOSト
ランジスタ、3はシリアルメモリ、4はセンスアンプで
ある。
FIG. 2 shows a conventional semiconductor integrated circuit. In this figure, 1 is an N-type MoS transistor, 2 is a P-type MOS transistor, 3 is a serial memory, and 4 is a sense amplifier.

次に動作について説明する。Next, the operation will be explained.

センスアンプ4でセンスされたデータは、WDT制御信
号によってラッチ構成のシリアルメモリ3に保持され、
RDT制御信号によってI10データバス線にデータが
転送される。ここでBL線が“H”のときシリアルメモ
リ3に°゛H”が書き込まれると定義する。例えばシリ
アルメモリ3に“H″のデータが保持されていて、次に
“L”のデータを書き込むとき、電源電圧が5[V]!
#−であるため、センスアンプ4とシリアルメモリ3の
ラッチバランスからデータを反転しすらいという問題が
ある。そこで、シリアルメモリ3のラッチ部のトランジ
スタサイズをセンスアンプ4のそれより小さくすれば、
シリアルメモリ3のラッチ力が落ちて、データ転送は容
易になるが、サイズを小さくしたためシリアルメモリ3
からI10データバス線への転送時の駆動能力が落ちて
、アクセスタイムを遅らせてしまうという問題もある。
The data sensed by the sense amplifier 4 is held in the latch-configured serial memory 3 by the WDT control signal.
Data is transferred to the I10 data bus line by the RDT control signal. Here, it is defined that when the BL line is "H", °゛H" is written to the serial memory 3. For example, if "H" data is held in the serial memory 3, then "L" data is written. When the power supply voltage is 5 [V]!
Since it is #-, there is a problem that the data may be inverted due to the latch balance between the sense amplifier 4 and the serial memory 3. Therefore, if the transistor size of the latch part of the serial memory 3 is made smaller than that of the sense amplifier 4,
The latch force of serial memory 3 is reduced, making data transfer easier, but since the size has been reduced, serial memory 3
There is also the problem that the driving ability during transfer from the I10 data bus line to the I10 data bus line decreases, resulting in a delay in access time.

〔発明が解決しようとする課題) 上記のような従来の半導体集積回路では、センスアンブ
4とシリアルメモリ3のラッチ部分のトランジスタサイ
ズを小さくすることでデータ反転を容易にできるが、I
10データバス線への駆動能力が弱くなりアクセスタイ
ムを送らせてしまう問題点があった。
[Problems to be Solved by the Invention] In the conventional semiconductor integrated circuit as described above, data inversion can be easily performed by reducing the transistor size of the sense amplifier 4 and the latch portion of the serial memory 3.
There was a problem in that the driving ability for the 10 data bus lines was weakened and the access time was delayed.

この発明は、上記のような従来の問題点を除去するため
になされたもので、センスアンプからシリアルメモリへ
の転送を容易にし、かつシリアルメモリのデータバス駆
動能力を大きくした半導体集積回路を得ることを目的と
している。
The present invention was made in order to eliminate the above-mentioned conventional problems, and provides a semiconductor integrated circuit that facilitates transfer from a sense amplifier to a serial memory and increases the data bus driving capability of the serial memory. The purpose is to

(課題を解決するための手段) この発明に係る半導体集積回路は、センスアンプからシ
リアルメモリへの転送時に、シリアルメモリ部の電源電
圧を、外部電源とこの外部電源よりも低い内部降圧電源
に切り換える電源切換回路を備えたものである。
(Means for Solving the Problems) A semiconductor integrated circuit according to the present invention switches the power supply voltage of the serial memory section to an external power supply and an internal step-down power supply lower than this external power supply at the time of transfer from the sense amplifier to the serial memory. It is equipped with a power supply switching circuit.

〔作用〕[Effect]

この発明においては、センスアンプからシリアルメモリ
への転送時と、シリアルメモリからI10データバス線
への転送時とのシリアルメモリのラッチ部の電源電圧を
外部電源と内部降圧電源に制御するようにしたことから
、シリアルメモリからのデータバスの駆動能力を高めて
もセンスアンプからシリアルメモリへの転送を容易にす
る。
In this invention, the power supply voltage of the latch section of the serial memory is controlled between an external power supply and an internal step-down power supply during transfer from the sense amplifier to the serial memory and during transfer from the serial memory to the I10 data bus line. Therefore, even if the drive capability of the data bus from the serial memory is increased, the transfer from the sense amplifier to the serial memory is facilitated.

〔実施例〕〔Example〕

以下、この発明の半導体集積回路の一実施例を第1図に
ついて説明する。第1図において、1〜4は第2図と同
じものであり、5は前記シリアルメモリ3の電源電圧を
外部電源と内部降圧電源に切り換える電源切換回路であ
る。
An embodiment of the semiconductor integrated circuit of the present invention will be described below with reference to FIG. In FIG. 1, 1 to 4 are the same as those in FIG. 2, and 5 is a power supply switching circuit for switching the power supply voltage of the serial memory 3 between an external power supply and an internal step-down power supply.

第1図に示すように、電源切換回路5はp型電界効果ト
ランジスタp−Trとダイオード接続されたn型電界効
果トランジスタn−Tr】とn型電界効果トランジスタ
n−Tr2とからなる。シリアルメモリ3のラッチ部の
電源電圧を制御信号φの“H”または“L”の切換えに
より外部電源と内部降圧電源とに切り換えられるように
制御する。
As shown in FIG. 1, the power supply switching circuit 5 includes a p-type field effect transistor p-Tr, a diode-connected n-type field effect transistor n-Tr, and an n-type field effect transistor n-Tr2. The power supply voltage of the latch section of the serial memory 3 is controlled to be switched between an external power supply and an internal step-down power supply by switching the control signal φ between "H" and "L".

すなわち、センスアンプ4でセンスされたデータはWD
T制御信号によってシリアルメモリ3に書き込まれる。
In other words, the data sensed by the sense amplifier 4 is
It is written into the serial memory 3 by the T control signal.

そして、RDT信号によってI10データバス線に読み
出される。ここで、例えばはじめにシリアルメモリ3に
“L ”のデータが保持され、次に、“H”のデータを
書き込ませようとする場合、制御信号φを゛Hパにする
ことによってn型電界効果トランジスタn−Tr2がオ
ンし、p型電界効果トランジスタp−Trはオフ、n型
電界効果トランジスタn−Tr2はオンとなり、n型電
界効果トランジスタn−Triによる電圧降下VTHの
ため外部電圧VCCはV。C−VTMとしてシリアルメ
モリ3のラッチ部に供給される。
Then, it is read out to the I10 data bus line by the RDT signal. Here, for example, if "L" data is first held in the serial memory 3 and then "H" data is to be written, the n-type field effect transistor is n-Tr2 is turned on, the p-type field effect transistor p-Tr is turned off, and the n-type field effect transistor n-Tr2 is turned on, and the external voltage VCC is V due to the voltage drop VTH due to the n-type field effect transistor n-Tri. It is supplied to the latch section of the serial memory 3 as C-VTM.

すなわち、電源電圧が内部降圧電源に接続された形とな
るため容易にデータの内容を反転させることができる。
That is, since the power supply voltage is connected to the internal step-down power supply, the content of data can be easily inverted.

そして、I10データバス線に転送させる時は制御信号
φを“L”にすることによってp型N界効果トランジス
タp−Trがオンし、n型電界効果トランジスタn−T
r2はオフとなる。P型電界効果トランジスタp−Tr
はP型のため電圧降下がないので電源電圧は外部電源V
CCに直接接続される形となるため、駆動能力を落さず
転送できるので、アクセスタイムを速くすることが可能
である。
When data is transferred to the I10 data bus line, the control signal φ is set to "L" to turn on the p-type N field effect transistor p-Tr, and the n-type field effect transistor n-T
r2 is turned off. P-type field effect transistor p-Tr
Since it is a P type, there is no voltage drop, so the power supply voltage is the external power supply V.
Since it is directly connected to the CC, it is possible to transfer data without reducing drive performance, thereby making it possible to speed up access time.

なお、外部電源V CC,内部降圧電源の値としてはい
くつか考えられるが、例えば外部電源VCCは5V、内
部降圧電源は3.3■である。
There are several possible values for the external power supply VCC and the internal step-down power supply; for example, the external power supply VCC is 5V, and the internal step-down power supply is 3.3V.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、この発明は、センスアンプからシ
リアルメモリへのデータ転送時、シリアルメモリのラッ
チ部の電源電圧を、外部電源とこの外部電源より低い内
部降圧電源に切り換えられる電源切換回路を内蔵したの
で、データの転送を容易にし、しかもI10データバス
線の駆動能力をたかめるので、アクセスタイムを速くす
ることが可能となる。
As explained above, this invention has a built-in power supply switching circuit that can switch the power supply voltage of the latch section of the serial memory between an external power supply and an internal step-down power supply lower than this external power supply when data is transferred from the sense amplifier to the serial memory. This facilitates data transfer and increases the driving ability of the I10 data bus line, making it possible to speed up access time.

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

第1図はこの発明の一実施例を示す半導体集積回路の構
成図、第2図は従来の半導体集積回路の構成図である。 図において、1はN型MOSトランジスタ、2はP型M
OSトランジスタ、3はシリアルメモリ、4はセンスア
ンプ、5は電源切換回路、p−Trはp型電界効果トラ
ンジスタ、n−Trl。 n−Tr2はn型電界効果トランジスタである。 なお、各図中の同一符号は同一または相当部分を示す。
FIG. 1 is a block diagram of a semiconductor integrated circuit showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional semiconductor integrated circuit. In the figure, 1 is an N-type MOS transistor, 2 is a P-type M
3 is a serial memory, 4 is a sense amplifier, 5 is a power supply switching circuit, p-Tr is a p-type field effect transistor, and n-Trl. n-Tr2 is an n-type field effect transistor. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] 半導体チップ上において、センスアンプからシリアルメ
モリへのデータ転送時、前記シリアルメモリのラッチ部
の電源電圧を、外部電源とこの外部電源より低い内部降
圧電源に切り換えられる電源切換回路を内蔵したことを
特徴とする半導体集積回路。
The semiconductor chip is characterized by a built-in power supply switching circuit that can switch the power supply voltage of the latch section of the serial memory between an external power supply and an internal step-down power supply lower than the external power supply when data is transferred from the sense amplifier to the serial memory. Semiconductor integrated circuit.
JP2063035A 1990-03-13 1990-03-13 Semiconductor integrated circuit Pending JPH03263689A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2063035A JPH03263689A (en) 1990-03-13 1990-03-13 Semiconductor integrated circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2063035A JPH03263689A (en) 1990-03-13 1990-03-13 Semiconductor integrated circuit

Publications (1)

Publication Number Publication Date
JPH03263689A true JPH03263689A (en) 1991-11-25

Family

ID=13217671

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2063035A Pending JPH03263689A (en) 1990-03-13 1990-03-13 Semiconductor integrated circuit

Country Status (1)

Country Link
JP (1) JPH03263689A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016506672A (en) * 2012-12-20 2016-03-03 クアルコム,インコーポレイテッド Sense amplifier including level shifter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016506672A (en) * 2012-12-20 2016-03-03 クアルコム,インコーポレイテッド Sense amplifier including level shifter

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