PY291A
DEVICE ERASURE
25 Wsec/cm2. If using a UV lamp of 12 mW/cm2, the
exposure time is estimated to be 35 minutes. Devices
should be positioned within 1 inch of the lamp during the
erasure process. Permanent damage can occur to the
devices if exposed to UV light for an extended period of
time.
If the device is subjected to wavelengths of light below
4000 Angstroms, device erasure will commence. It is
thereforerecommendedtouseanopaquelabeloverthe
windowintheeventthedevicewillbeexposedtolighting
for a long time. The UV dose for erasure requires a
wavelength of 2,537 Angstroms for a minimum dose of
MODE SELECTION
Pin Function
Read or Output Disable
Other
A10-A0
CS3
PGM
VIH
CS2
VFY
VIH
O7-O0
D7-D0
O7-O0
High Z
High Z
High Z
D7-D0
O7-O0
High Z
D7-D0
Zeros
CS1
VPP
VIL
VIH
X
Mode
A10-A0
A10-A0
A10-A0
A10-A0
A10-A0
A10-A0
A10-A0
A10-A0
A10-A0
A10-A0
Read
Output Disable
Output Disable
Output Disable
Program
X
X
X
VIL
VIL
X
X
VILP
VIHP
VIHP
VILP
VIHP
VIHP
VILP
VIHP
VIHP
VILP
VPP
VPP
VPP
VPP
VPP
Program Verify
Program Inhibit
Intelligent Program
Blank Check Zeros
X = Don't Care
PROGRAMMING PINOUTS
Document # EPROM101 REV OR
Page 4 of 9
PYRAMID [ PYRAMID SEMICONDUCTOR CORPORATION ]
