M27V160-200XM6TR STMicroelectronics, M27V160-200XM6TR Datasheet - Page 8

• Manufacturer Part Number: M27V160-200XM6TR
• Description: 16 Mbit 2Mb x8 or 1Mb x16 Low Voltage UV EPROM and OTP EPROM
• Manufacturer: STMicroelectronics

M27V201
Figure 6. Programming and Verify Modes AC Waveforms
Figure 7. Programming Flowchart
8/15
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 at V
higher than 3.6V provides the necessary margin to
each programmed cell.
Program Inhibit
Programming of multiple M27V201s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including G of the parallel
M27V201 may be common. A TTL low level pulse
applied to a M27V201’s P input, with E low and
V
level E input inhibits the other M27V201s from be-
ing 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
at 12.75V, will program that M27V201. A high
VERIFY
tGLQV
DATA OUT
IL
, P at V
IH
, V
PP
tGHQZ
tGHAX
at 12.75V and V
AI00720
CC
much
CC
at