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| T74LS04M013TR资料 | |
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T74LS04M013TR PDF Download |
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File Size : 116 KB
Manufacturer:ST Description:RESET: A RESET input pin is provided to ease some sys- tem applications. When RESET is at a logic high level, the device is in its standard operating mode. A low level on the RESET input halts the present device operation and puts the outputs of the device in a high impedance state. When a high level is reasserted on the RESET pin, the device returns to the Read or Standby mode, depending upon the state of the control inputs. By applying a 12V 0.5V input signal to the RESET pin any sector can be reprogrammed even if the sector lockout feature has been enabled (see Sector Programming Lockout Override section). ERASURE: Before a byte/word can be reprogrammed, it must be erased. The erased state of memory bits is a logi- cal 1. The entire device can be erased by using the Chip Erase command or individual sectors can be erased by using the Sector Erase commands. CHIP ERASE: The entire device can be erased at one time by using the 6-byte chip erase software code. After the chip erase has been initiated, the device will internally time the erase operation so that no external clocks are required. The maximum time to erase the chip is tEC. If the sector lockout has been enabled, the Chip Erase will not erase the data in the sector that has been locked; it will erase only the unprotected sectors. After the chip erase, the device will return to the read or standby mode. SECTOR ERASE: As an alternative to a full chip erase, the device is organized into forty sectors (SA0 - SA39) that can be individually erased. The Sector Erase command is a six bus cycle operation. The sector address is latched on the falling WE edge of the sixth cycle while the 30H data input command is latched on the rising edge of WE. The sector erase starts after the rising edge of WE of the sixth cycle. The erase operation is internally controlled; it will automati- cally time to completion. The maximum time to erase a sec- tion is tSEC. When the sector programming lockout feature is not enabled, the sector will erase (from the same sector erase command). Once a sector has been protected, data in the protected sectors cannot be changed unless the RESET pin is taken to 12V 0.5V. An attempt to erase a sector that has been protected will result in the operation terminating in 2 µs. BYTE/WORD PROGRAMMING: Once a memory block is erased, it is programmed (to a logical 0) on a byte-by-byte or on a word-by-word basis. Programming is accomplished via the internal device command register and is a 4-bus cycle operation. The device will automatically generate the required internal program pulses. Any commands written to the chip during the embedded programming cycle will be ignored. If a hardware reset hap- pens during programming, the data at the location being programmed will be corrupted. Please note that a data 0 cannot be programmed back to a 1; only erase operations can convert 0s to 1s. Programming is completed after |
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| 1PCS | 100PCS | 1K | 10K | ||
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型 号：T74LS04M013TR 厂 家：ST 封 装：SOP3.9 批 号：93+/34 数 量：9980 说 明： |
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运 费：广东省内10元(平邮),广东省外20元(快递) 所在地：深圳市 新旧程度： |
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| 联系人：黄林锋 |
| 电 话：0755-82579969,83255343 |
| 手 机：13714599954, |
| QQ：172517499,137550090 |
| MSN：zfdz168@hotmail.com |
| 传 真：0755-82738881 |
| EMail：zfdz168@163.com |
| 公司地址： 深圳市福田区华强北路华强广场B座28楼L室 |
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