W27E010
Publication Release Date: May 1997
- 3 - Revision A5
Standby Mode
The standby mode significantly reduces VCC current. This mode is entered when
= VIH. In
standby mode, all outputs are in a high impedance state, independent of
and
.
Two-line Output Control
Since EPROMs are often used in large memory arrays, the W27E010 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
EPROM power switching characteristics require careful device decoupling. System designers are
concerned with three supply current issues: standby current levels (ISB), active current levels (ICC),
and transient current peaks produced by the falling and rising edges of
. 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 µF 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, X=VIH or VIL
MODE PINS
CE OE PGM A0 A9 VCC VPP OUTPUTS
Read VIL VIL X X X VCC VCC DOUT
Output Disable VIL VIH X X X VCC VCC High Z
Standby (TTL) VIH X X X X VCC VCC High Z
Standby (CMOS)
VCC ±0.3V
X X X X VCC VCC High Z
Program VIL VIH VIL X X VCP VPP DIN
Program Verify VIL VIL VIH X X VCP VPP DOUT
Program Inhibit VIH X X X X VCP VPP High Z
Erase VIL VIH VIL VIL VPE VCC VPE FF (Hex)
Erase Verify VIL VIL VIH X X VCC VPE DOUT
Erase Inhibit VIH X X X X VCP VPE High Z
Product Identifier-
Manufacturer
VIL VIL X VIL VHH VCC VCC DA (Hex)
Product Identifier-Device VIL VIL X VIH VHH VCC VCC 01 (Hex)
(16 pages)
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