NM27C256 Fairchild, NM27C256 Datasheet - Page 6

• Manufacturer Part Number: NM27C256
• Description: 262 /144-Bit (32K x 8) High Performance CMOS EPROM
• Manufacturer: Fairchild

Turbo Programming Algorithm Flow Chart
Note:
The standard National Semiconductor algorithm may also be used but it will have longer programming time.
DEVICE
FAILED
INCREMENT
ADDRESS
YES
n = 10?
NO
ADDRESS = FIRST LOCATION
ADDRESS = FIRST LOCATION
PROGRAM ONE 50 s PULSE
V
2ND: V
1ST: V
CC
FAIL
CHECK ALL BYTES
NO
= 6.5V V
INCREMENT n
ADDRESS
ADDRESS
FIGURE 1.
CC
VERIFY
VERIFY
CC
BYTE
BYTE
LAST
LAST
n = 0
= V
= V
?
?
PP
PASS
YES
PASS
YES
6
PP
PP
= 12.75V
= 6.0V
= 4.3V
NO
FAIL
INCREMENT
ADDRESS
PROGRAM ONE
n = 0
PULSE
50 s
DS010833-6
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