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參數資料
| 型號： | DM74LS670 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 3-STATE 4-by-4 Register File(三態(tài)輸出的4字/4位的寄存器堆) |
| 中文描述： | 三態(tài)4 × 4寄存器文件（三態(tài)輸出的4字/ 4位的寄存器堆） |
| 文件頁數： | 1/6頁 |
| 文件大小： | 65K |
| 代理商： | DM74LS670 |
2000 Fairchild Semiconductor Corporation
DS006436
www.fairchildsemi.com
August 1986
Revised March 2000
D
DM74LS670
3-STATE 4-by-4 Register File
General Description
These register files are organized as 4 words of 4 bits
each, and separate on-chip decoding is provided for
addressing the four word locations to either write-in or
retrieve data. This permits writing into one location, and
reading from another word location, simultaneously.
Four data inputs are available to supply the word to be
stored. Location of the word is determined by the write
select inputs A and B, in conjunction with a write-enable
signal. Data applied at the inputs should be in its true form.
That is, if a high level signal is desired from the output, a
high level is applied at the data input for that particular bit
location. The latch inputs are arranged so that new data
will be accepted only if both internal address gate inputs
are HIGH. When this condition exists, data at the D input is
transferred to the latch output. When the write-enable
input, G
W
, is HIGH, the data inputs are inhibited and their
levels can cause no change in the information stored in the
internal latches. When the read-enable input, G
R
, is HIGH,
the data outputs are inhibited and go into the high imped-
ance state.
The individual address lines permit direct acquisition of
data stored in any four of the latches. Four individual
decoding gates are used to complete the address for read-
ing a word. When the read address is made in conjunction
with the read-enable signal, the word appears at the four
outputs.
This arrangement—data entry addressing separate from
data read addressing and individual sense line — elimi-
nates recovery times, permits simultaneous reading and
writing, and is limited in speed only by the write time (27 ns
typical) and the read time (24 ns typical). The register file
has a non-volatile readout in that data is not lost when
addressed.
All inputs (except read enable and write enable) are buff-
ered to lower the drive requirements to one normal Series
DM74LS load, and input clamping diodes minimize switch-
ing transients to simplify system design. High speed, dou-
ble ended AND-OR-INVERT gates are employed for the
read-address function and have high sink current, 3-STATE
outputs. Up to 128 of these outputs may be wire-AND con-
nected for increasing the capacity up to 512 words. Any
number of these registers may be paralleled to provide n-
bit word length.
Features
I
For use as:
Scratch pad memory
Buffer storage between processors
Bit storage in fast multiplication designs
I
Separate read/write addressing permits simultaneous
reading and writing
I
Organized as 4 words of 4 bits
I
Expandable to 512 words of n-bits
I
3-STATE versions of DM74LS170
I
Fast access times 20 ns typ
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Order Number
DM74LS670M
DM74LS670N
Package Number
M16A
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
相關PDF資料 |
PDF描述 |
|---|---|
| DM74LS670MX | Register File |
| DM74LS670M | 3-STATE 4-by-4 Register File |
| DM74LS670N | 3-STATE 4-by-4 Register File |
| DM74LS73A | Dual Negative-Edge-Triggered Master-Slave J-K Flip-Flops with Clear and Complementary Outputs(帶清零和互補輸出的雙負邊緣觸發(fā)的主-從J-K觸發(fā)器) |
| DM74LS73AM | Dual Negative-Edge-Triggered Master-Slave J-K Flip-Flops with Clear and Complementary Outputs |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DM74LS670 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DM74LS670M | 功能描述:寄存器 3-STATE 4-by-4 Reg RoHS:否 制造商:NXP Semiconductors 邏輯類型:CMOS 邏輯系列:HC 電路數量:1 最大時鐘頻率:36 MHz 傳播延遲時間: 高電平輸出電流:- 7.8 mA 低電平輸出電流:7.8 mA 電源電壓-最大:6 V 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-38 封裝:Tube |
| DM74LS670MX | 功能描述:寄存器 3-STATE 4-by-4 Reg RoHS:否 制造商:NXP Semiconductors 邏輯類型:CMOS 邏輯系列:HC 電路數量:1 最大時鐘頻率:36 MHz 傳播延遲時間: 高電平輸出電流:- 7.8 mA 低電平輸出電流:7.8 mA 電源電壓-最大:6 V 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-38 封裝:Tube |
| DM74LS670N | 功能描述:寄存器 3-STATE 4-by-4 Reg RoHS:否 制造商:NXP Semiconductors 邏輯類型:CMOS 邏輯系列:HC 電路數量:1 最大時鐘頻率:36 MHz 傳播延遲時間: 高電平輸出電流:- 7.8 mA 低電平輸出電流:7.8 mA 電源電壓-最大:6 V 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-38 封裝:Tube |
| DM74LS73A WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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