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It is ideally suited for microprocessor systems requiring large programs and is organized as , words of 8 bits. The FDIP32W window ceramic frit-seal package and the LCCC32W leadless chip carrier package have a transparent lids which allow the user to expose the chip to ultraviolet light to erase the bit pattern.
A new pattern can then be written to the device by following the programming procedure. Figure 2C. A single power supply is required in the read mode. Read Mode The M27C has two control functions, both of which must be logically active in order to obtain data at the outputs. Chip Enable E is the power control and should be used for device selection.
Output Enable G is the output control and should be used to gate data to the output pins, independent of device selection. When in the standby mode, the outputs are in a high impedance state, independent of the G input. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not i mplied.
Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Minimum DC voltage on Input or Output is —0. Depends on range. Table 3. The two line control function allows : a. For the most efficientuse of thesetwo controllines, E should be decoded and used as the primary device selecting function, while G should be made a common connection to all devices in the array and connected to the READ line from the system control bus.
This ensures that all deselected memory devices are in their low power standby mode and that the output pins are only active when data is required from a particular memory device.
AC Testing Load Circuit 1. Standard 2. The supply current, ICC, has three segments that are of interest to the system designer: the standby current level, the active current level, and transient current peaks that are produced by the falling and rising edges of E.
The magnitude of the transient current peaks is dependent on the capacitiveand inductiveloading of the deviceat the output. It is recommended that a 0. This should be a high frequency capacitor of low inherent inductance and should be placed as close to the device as possible. In addition, a 4. The bulk capacitor should be located near the power supply connection point.
The purpose of the bulk capacitor is to overcome the voltage drop caused by the inductive effects of PCB traces. M27C Table 7. A mA mA? Table 8A. In case of 45ns speed see High Speed AC measurament conditions.
Figure 5. The M27C is in the programming mode when Vpp input is at The data to be programmed is applied to 8 bits in parallel to the data output pins.
The levels required for the address and data inputs are TTL. VCC is specified to be 6. Table Program Inhibit Programming of multiple M27Cs in parallel with different data is also easily accomplished. Except for E, all like inputs including G of the parallel M27C may be common. A high level E input inhibits the other M27Cs from being programmed.
Program Verify A verify read should be performed on the programmed bits to determine that they were correctly programmed. See the relevant Application Note AN This mode is intended for use by programming equipment to automatically match the device to be programmed with its corresponding programmingalgorithm.
To activate the ES mode, the programmingequipment must force It shouldbe notedthat sunlight and some type of fluorescent lamps have wavelengthsin the ? Research shows that constant exposure to room level fluorescent lighting could erase a typical M27C in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight.
If the M27C is to be exposed to these types of lighting conditions for extended periods of time, it is suggested that opaque labels be put over the M27C window to prevent unintentional erasure. The recommended erasure procedurefor the M27C is exposure to short wave ultraviolet light which has a wavelength of ?. The integrated dose i.
The erasure time with this dosage is approximately 15 to 20 minutes using an ultraviolet lamp with ? The M27C should be placed within 2. Some lamps have a filter on their tubes which should be removed before erasure. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics.
Spec ifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.