Datenblatt-Suchmaschine für elektronische Bauteile |
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AM28F020A-90JEB Datenblatt(PDF) 9 Page - Advanced Micro Devices |
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AM28F020A-90JEB Datenblatt(HTML) 9 Page - Advanced Micro Devices |
9 / 35 page Am28F020A 9 FUNCTIONAL DESCRIPTION Description Of User Modes Table 1. Am28F020A Device Bus Operations (Notes 7 and 8) Legend: X = Don’t care, where Don’t Care is either VIL or VIH levels. VPPL = VPP < VCC + 2 V. See DC Characteristics for voltage levels of VPPH. 0 V < An < VCC + 2 V, (normal TTL or CMOS input levels, where n = 0 or 9). Notes: 1. VPPL may be grounded, connected with a resistor to ground, or < VCC + 2.0 V. VPPH is the programming voltage specified for the device. Refer to the DC characteristics. When VPP = VPPL, memory contents can be read but not written or erased. 2. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Table 2. 3. 11.5 < VID < 13.0 V. Minimum VID rise time and fall time (between 0 and VID voltages) is 500 ns. 4. Read operation with VPP = VPPH may access array data or the Auto select codes. 5. With VPP at high voltage, the standby current is ICC + IPP (standby). 6. Refer to Table 3 for valid DIN during a write operation. 7. All inputs are Don’t Care unless otherwise stated, where Don’t Care is either VIL or VIH levels. In the Auto select mode all addresses except A9 and A0 must be held at VIL. 8. If VCC ≤ 1.0 Volt, the voltage difference between VPP and VCC should not exceed 10.0 volts. Also, the Am28F256 has a VPP rise time and fall time specification of 500 ns minimum. Operation CE# (E#) OE# (G#) WE# (W#) VPP (Note 1) A0 A9 I/O Read-Only Read VIL VIL XVPPL A0 A9 DOUT Standby VIH XX VPPL X X HIGH Z Output Disable VIL VIH VIH VPPL X X HIGH Z Auto-select Manufacturer Code (Note 2) VIL VIL VIH VPPL VIL VID (Note 3) CODE (01h) Auto-select Device Code (Note 2) VIL VIL VIH VPPL VIH VID (Note 3) CODE (29h) Read/Write Read VIL VIL VIH VPPH A0 A9 DOUT (Note 4) Standby (Note 5) VIH XX VPPH X X HIGH Z Output Disable VIL VIH VIH VPPH X X HIGH Z Write VIL VIH VIL VPPH A0 A9 DIN (Note 6) |
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