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M27V256-120F1TR Scheda tecnica(PDF) 4 Page - STMicroelectronics |
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M27V256-120F1TR Scheda tecnica(HTML) 4 Page - STMicroelectronics |
4 / 15 page M27V256 4/15 Two Line Output Control Because EPROMs are usually used in larger memory arrays, this product features a 2 line con- trol function which accommodates the use of mul- tiple memory connection. The two line control function allows: a. the lowest possible memory power dissipation, b. complete assurance that output bus contention will not occur. For the most efficient use of these two control lines, E should be decoded and used as the prima- ry 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 deselect- ed memory devices are in their low power standby mode and hat the output pins are only active when data is desired from a particular memory device. System Considerations The power switching characteristics of Advance CMOS EPROMs require careful decoupling of the devices. The supply current, ICC, has three seg- ments 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 this transient current peaks is dependent on the capacitive and inductive loading of the device at the output. Table 5. AC Measurement Conditions High Speed Standard Input Rise and Fall Times ≤ 10ns ≤ 20ns Input Pulse Voltages 0 to 3V 0.4V to 2.4V Input and Output Timing Ref. Voltages 1.5V 0.8V and 2V Figure 3. AC Testing Input Output Waveform AI01822 3V High Speed 0V 1.5V 2.4V Standard 0.4V 2.0V 0.8V Figure 4. AC Testing Load Circuit AI01823B 1.3V OUT CL CL = 30pF for High Speed CL = 100pF for Standard CL includes JIG capacitance 3.3k Ω 1N914 DEVICE UNDER TEST Table 6. Capacitance (1) (TA =25 °C, f = 1 MHz) Note: Sampled only, not 100% tested. Symbol Parameter Test Condit ion Min Max Unit CIN Input Capacitance VIN =0V 6pF COUT Output Capacitance VOUT =0V 12 pF |
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