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參數(shù)資料
| 型號(hào)： | HEF4720BP |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | SRAM |
| 英文描述： | 256-bit, 1-bit per word random access memories |
| 中文描述： | 256 X 1 STANDARD SRAM, 580 ns, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大小： | 180K |
| 代理商： | HEF4720BP |
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January 1995
9
Philips Semiconductors
Product specification
256-bit, 1-bit per word random access memories
HEF4720B
HEF4720V
APPLICATION INFORMATION
Extension of memory capacity
The memory capacity of the HEF4720B; V is 256 bits (or
256 words of 1 bit). The capacity of a system can be
extended in various ways by the connection of further
HEF4720B; V ICs.
Extending the word length
By connecting a number of HEF4720B; V ICs as shown in
Fig.6, the word length (i.e. bits per word) is multiplied by
that number. That is, each device stores 1 bit per word but
the total number of words remains 256. For example, if
four devices are used in this way, 256 four-binary-bit words
can be stored.
Extending the number of words
If a number of HEF4720B; V ICs are connected as shown
in Fig.7, the words available are multiplied by that number,
but the word length remains 1 bit. Notice that in this case
additional addresses are used in conjunction with the
CS input. In the case shown in Fig.7 (4
×
HEF4720B; V in
parallel), the addresses and data inputs are loaded with
four inputs (= 20 pF), the CS inputs are loaded with one
input each.
Extending both the word length and number of words
Figure 8 shows how a combination of the extensions
described above can be used to obtain both greater word
length and additional words. It is clear that the capacitive
load of the driving circuits puts a limit to the free choice of
the interface. In Fig.8, each address is loaded with 16
inputs, i.e. 16
×
5 = 80 pF: each CS inverter is loaded with
8 inputs, i.e. 8
×
5 = 40 pF. The data inverters in this case
are loaded with only two inputs each.
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| HEF4724BF | 8-bit addressable latch |
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| HEF4750VD,112 | 制造商:NXP Semiconductors 功能描述:FREQUENCY SYNTHESIZER - Rail/Tube |
| HEF4794BP | 制造商:NXP Semiconductors 功能描述:Shift Register Single 8-Bit Serial to Serial/Parallel 16-Pin PDIP Tube |
| HEF4794BP,112 | 功能描述:LED照明驅(qū)動(dòng)器 8STG SHIFT/STORE REG W/LED DRIVER RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| HEF4794BT | 制造商:NXP Semiconductors 功能描述:Shift Register Single 8-Bit Serial to Serial/Parallel 16-Pin SO Tube |
| HEF4794BT,112 | 功能描述:LED照明驅(qū)動(dòng)器 SHIFT/REGISTER STORE RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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