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M27C405-90K1TR 데이터시트(PDF) 8 Page - STMicroelectronics |
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M27C405-90K1TR 데이터시트(HTML) 8 Page - STMicroelectronics |
8 / 15 page tAVPL VALID AI00725 A0-A18 Q0-Q7 VPP VCC G DATA IN DATA OUT E tQVEL tVPHEL tVCHEL tEHQX tELEH tGLQV tQXGL tGHQZ tGHAX PROGRAM VERIFY Figure 6. Programming and Verify Modes AC Waveforms System Considerations The power switching characteristics of Advanced CMOS OTP EPROMs require careful decoupling of the devices. The supply current, ICC, has three segments that are of interest to the system de- signer : the standby current level, the active current level, and transient current peaks that are pro- duced by the falling and rising edges of E. The magnitude of the transient current peaks is de- pendent on the capacitive and inductive loading of the device at the output. The associated transient voltage peaks can be suppressed by complying with the two line output control and by properly selected decoupling ca- pacitors. It is recommended that a 0.1 µF ceramic capacitor be used on every device between VCC and VSS. 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 4.7 µF bulk electrolytic capacitor should be used between VCC and VSS for every eight devices. 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. Programming When delivered, all bits of the M27C405 are in the ’1’ state. Data is introducedby selectively program- ming ’0’s into the desired bit locations. Although only ’0’s will be programmed, both ’1’s and ’0’s can be present in the data word. The M27C405 is in the programming mode when VPP input is at 12.75V,G is at VIH and E is pulsed to VIL. 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 6.25V ± 0.25V. 8/15 M27C405 |
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