W27L010 Datasheet, PDF (3/14 Pages) Winbond – 128K ´ 8 ELECTRICALLY ERASABLE EPROM

Preliminary W27L010
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 and PGM.
Two-line Output Control
Since EPROMs are often used in large memory arrays, the W27L010 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 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 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
VCC = 3.3V, VPP = 12V, VPE = 14V, VHH = 12V, VCP = 5V, X=VIH or VIL
MODE
Read
Output Disable
Standby (TTL)
Standby (CMOS)
Program
Program Verify
Program Inhibit
Erase
Erase Verify
Erase Inhibit
Product Identifier-
Manufacturer
Product Identifier-device
CE
VIL
VIL
VIH
VCC ±0.3V
VIL
VIL
VIH
VIL
VIL
VIH
VIL
OE PGM
VIL
X
VIH
X
X
X
XX
VIH VIL
VIL VIH
XX
VIH VIL
VIL VIH
XX
VIL
X
VIL
VIL
X
PINS
A0 A9
XX
XX
XX
XX
XX
XX
XX
VIL VPE
XX
XX
VIL VHH
VIH VHH
VCC VPP OUTPUTS
VCC VCC DOUT
VCC VCC High Z
VCC VCC High Z
VCC VCC High Z
VCP VPP DIN
VCP VPP DOUT
VCP VPP High Z
VCP VPE FF (Hex)
VCP VPE DOUT
VCP VPE High Z
VCC VCC DA (Hex)
VCC VCC 01 (Hex)
Publication Release Date: February 1999
-3-
Revision A1