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W27E512P-45 Datasheet(PDF) 3 Page - Winbond |
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W27E512P-45 Datasheet(HTML) 3 Page - Winbond |
3 / 16 page W27E512 Publication Release Date: June 2000 - 3 - Revision A9 Standby Mode The standby mode significantly reduces VCC current. This mode is entered when CE high. In standby mode, all outputs are in a high impedance state, independent of OE /VPP. Two-line Output Control Since EPROMs are often used in large memory arrays, the W27E512 provides two control inputs for multiple memory connections. Two-line control provides for lowest possible memory power dissipation and ensures that data bus contention will not occur. System Considerations An EPROM's power switching characteristics require careful device decoupling. System designers are interested in three supply current issues: standby current levels (ISB), active current levels (ICC), and transient current peaks produced by the falling and rising edges of CE. Transient current magnitudes depend on the device output's capacitive and inductive loading. Two-line control and proper decoupling capacitor selection will suppress transient voltage peaks. Each device should have a 0.1 µ F ceramic capacitor connected between its VCC and GND. This high frequency, low inherent- inductance capacitor should be placed as close as possible to the device. Additionally, for every eight devices, a 4.7 µF electrolytic capacitor should be placed at the array's power supply connection between VCC and GND. The bulk capacitor will overcome voltage slumps caused by PC board trace inductances. TABLE OF OPERATING MODES (VPP = 12V, VPE = 14V, VHH = 12V, VCP = 5V, VCE = 5V, X = VIH or VIL) MODE PINS CE OE /VPP A0 A9 VCC OUTPUTS Read VIL VIL X X VCC DOUT Output Disable VIL VIH X X VCC High Z Standby (TTL) VIH X X X VCC High Z Standby (CMOS) VCC ±0.3V X X X VCC High Z Program VIL VPP X X VCP DIN Program Verify VIL VIL X X VCC DOUT Program Inhibit VIH VPP X X VCP High Z Erase VIL VPE VIL VPE VCE DIH Erase Verify VIL VIL X X 3.75 DOUT Erase Inhibit VIH VPE X X VCE High Z Product Identifier-manufacturer VIL VIL VIL VHH VCC DA (Hex) Product Identifier-device VIL VIL VIH VHH VCC 08 (Hex) |
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