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AM28F020 Folha de dados(PDF) 8 Page - Advanced Micro Devices |
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AM28F020 Folha de dados(HTML) 8 Page - Advanced Micro Devices |
8 / 35 page 8 Am28F020 VCC < VLKO (see DC Characteristics section for voltages). When VCC < VLKO, the command register is disabled, all internal program/erase circuits are disabled, and the device resets to the read mode. The device ignores all writes until VCC > VLKO. The user must ensure that the control pins are in the correct logic state when VCC > VLKO to prevent uninitentional writes. Write Pulse “Glitch” Protection Noise pulses of less than 10 ns (typical) on OE#, CE# or WE# will not initiate a write cycle. Logical Inhibit Writing is inhibited by holding any one of OE# = VIL, CE# = VIH or WE# = VIH. To initiate a write cycle CE# and WE# must be a logical zero while OE# is a logical one. Power-Up Write Inhibit Power-up of the device with WE# = CE# = VIL and OE# = VIH will not accept commands on the rising edge of WE#. The internal state machine is automat- ically reset to the read mode on power-up. FUNCTIONAL DESCRIPTION Description of User Modes Table 1. Am28F020 Device Bus Operations 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 Am28F010 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 (2Ah) 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) |
Nº de peça semelhante - AM28F020 |
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Descrição semelhante - AM28F020 |
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