M27C2001-10C1X STMICROELECTRONICS [STMicroelectronics], M27C2001-10C1X Datasheet - Page 8

• Manufacturer Part Number: M27C2001-10C1X
• Description: 2 Mbit (256Kb x 8) UV EPROM and OTP EPROM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M27C2001
Figure 6. Programming and Verify Modes AC Waveforms
Figure 7. Programming Flowchart
8/16
YES
NO
FAIL
= 25
++n
V CC
A0-A17
Q0-Q7
V PP
E
P
G
V CC = 6.25V, V PP = 12.75V
CHECK ALL BYTES
NO
2nd: V CC = 4.2V
P = 100 s Pulse
1st: V CC = 6V
VERIFY
n = 0
Addr
Last
YES
YES
tVPHPL
tVCHPL
NO
tQVPL
tAVPL
tELPL
tPLPH
++ Addr
DATA IN
PROGRAM
AI00715C
VALID
tPHQX
PRESTO II Programming Algorithm
PRESTO II Programming Algorithm allows the
whole array to be programmed with a guaranteed
margin, in a typical time of 26.5 seconds. Pro-
gramming with PRESTO II consists of applying a
sequence of 100 s program pulses to each byte
until a correct verify occurs (see Figure 7). During
programming and verify operation, a MARGIN
MODE circuit is automatically activated in order to
guarantee that each cell is programmed with
enough margin. No overprogram pulse is applied
since the verify in MARGIN MODE provides the
necessary margin to each programmed cell.
Program Inhibit
Programming of multiple M27C2001s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including G of the parallel
M27C2001 may be common. A TTL low level
pulse applied to a M27C2001’s P input, with E low
and V
A high level E input inhibits the other M27C2001s
from being programmed.
Program Verify
A verify (read) should be performed on the pro-
grammed bits to determine that they were correct-
ly programmed. The verify is accomplished with E
and G at V
6.25V.
tQXGL
PP
VERIFY
tGLQV
DATA OUT
at 12.75V, will program that M27C2001.
IL
, P at V
IH
, V
PP
tGHQZ
tGHAX
at 12.75V and V
AI00720
CC
at