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M27C1001-10C6

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
7/17
M27C1001
Table 9. Programming Mode DC Characteristics
(1)
(T
A
= 25 °C; V
CC
= 6.25V ± 0.25V; V
PP
= 12.75V ± 0.25V)
Note: 1. V
CC
must be applied simultaneously with or before V
PP
and removed simultaneously or after V
PP
.
Table 10. Programming Mode AC Characteristics
(1)
(T
A
= 25 °C; V
CC
= 6.25V ± 0.25V; V
PP
= 12.75V ± 0.25V)
Note: 1. V
CC
must be applied simultaneously with or before V
PP
and removed simultaneously or after V
PP
.
2. Sampled only, not 100% tested.
Symbol Parameter Test Condition Min Max Unit
I
LI
Input Leakage Current
V
IL
≤
V
IN
≤
V
IH
±10 µA
I
CC
Supply Current 50 mA
I
PP
Program Current
E
= V
IL
50 mA
V
IL
Input Low Voltage –0.3 0.8 V
V
IH
Input High Voltage 2
V
CC
+ 0.5
V
V
OL
Output Low Voltage
I
OL
= 2.1mA
0.4 V
V
OH
Output High Voltage TTL
I
OH
= –400µA
2.4 V
V
ID
A9 Voltage 11.5 12.5 V
Symbol Alt Parameter Test Condition Min Max Unit
t
AVPL
t
AS
Address Valid to Program Low 2 µs
t
QVPL
t
DS
Input Valid to Program Low 2 µs
t
VPHPL
t
VPS
V
PP
High to Program Low
2µs
t
VCHPL
t
VCS
V
CC
High to Program Low
2µs
t
ELPL
t
CES
Chip Enable Low to Program Low 2 µs
t
PLPH
t
PW
Program Pulse Width 95 105 µs
t
PHQX
t
DH
Program High to Input Transition 2 µs
t
QXGL
t
OES
Input Transition to Output Enable Low 2 µs
t
GLQV
t
OE
Output Enable Low to Output Valid 100 ns
t
GHQZ
(2)
t
DFP
Output Enable High to Output Hi-Z 0 130 ns
t
GHAX
t
AH
Output Enable High to Address
Transition
0ns
Programming
When delivered (and after each erasure for UV
EPROM), all bits of the M27C1001 are in the '1'
state. Data is introduced by selectively program-
ming '0's into the desired bit locations. Although
only '0's will be programmed, both '1's and '0's can
be present in the data word. The only way to
change a '0' to a '1' is by die exposition to ultravio-
let light (UV EPROM). The M27C1001 is in the
programming mode when V
PP
input is at 12.75V,
E
is at V
IL
and P is pulsed to V
IL
. The data to be
programmed is applied to 8 bits in parallel to the
data output pins. The levels required for the ad-
dress and data inputs are TTL. V
CC
is specified to
be 6.25V ± 0.25V.
M27C1001
8/17
PRESTO II Programming Algorithm
PRESTO II Programming Algorithm allows the
whole array to be programmed, with a guaranteed
margin, in a typical time of 13 seconds. Program-
ming with PRESTO II involves in applying a se-
quence of 100µs program pulses to each byte until
a correct verify occurs (see Figure 7). During pro-
gramming and verify operation, a MARGIN MODE
circuit is automatically activated in order to guar-
antee that each cell is programmed with enough
margin. No overprogram pulse is applied since the
verify in MARGIN MODE provides necessary mar-
gin to each programmed cell.
Program Inhibit
Programming of multiple M27C1001s in parallel
with different data is also easily accomplished. Ex-
cept for E
, all like inputs including G of the parallel
M27C1001 may be common. A TTL low level
pulse applied to a M27C1001's P
input, with E low
and V
PP
at 12.75V, will program that M27C1001.
A high level E
input inhibits the other M27C1001s
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
IL
, P at V
IH
, V
PP
at 12.75V and V
CC
at
6.25V.
Figure 6. Programming and Verify Modes AC Waveforms
tAVPL
VALID
AI00714
A0-A16
Q0-Q7
V
PP
V
CC
P
G
DATA IN DATA OUT
E
tQVPL
tVPHPL
tVCHPL
tPHQX
tPLPH
tGLQV
tQXGL
tELPL
tGHQZ
tGHAX
PROGRAM VERIFY
Figure 7. Programming Flowchart
AI00715C
n = 0
Last
Addr
VERIFY
P = 100µs Pulse
++n
= 25
++ Addr
V
CC
= 6.25V, V
PP
= 12.75V
FAIL
CHECK ALL BYTES
1st: V
CC
= 6V
2nd: V
CC
= 4.2V
YES
NO
YES
NO
YES
NO
9/17
M27C1001
Electronic Signature
The Electronic Signature (ES) mode allows the
reading out of a binary code from an EPROM that
will identify its manufacturer and type. This mode
is intended for use by programming equipment to
automatically match the device to be programmed
with its corresponding programming algorithm.
The ES mode is functional in the 25°C ± 5°C am-
bient temperature range that is required when pro-
gramming the M27C1001. To activate the ES
mode, the programming equipment must force
11.5V to 12.5V on address line A9 of the
M27C1001, with V
PP
= V
CC
= 5V. Two identifier
bytes may then be sequenced from the device out-
puts by toggling address line A0 from V
IL
to V
IH
. All
other address lines must be held at V
IL
during
Electronic Signature mode.
Byte 0 (A0 = V
IL
) represents the manufacturer
code and byte 1 (A0 = V
IH
) the device identifier
code. For the STMicroelectronics M27C1001,
these two identifier bytes are given in Table 4 and
can be read-out on outputs Q7 to Q0.
ERASURE OPERATION (applies to UV EPROM)
The erasure characteristics of the M27C1001 is
such that erasure begins when the cells are ex-
posed to light with wavelengths shorter than ap-
proximately 4000 Å. It should be noted that
sunlight and some type of fluorescent lamps have
wavelengths in the 3000-4000 Å range. Research
shows that constant exposure to room level fluo-
rescent lighting could erase a typical M27C1001 in
about 3 years, while it would take approximately 1
week to cause erasure when exposed to direct
sunlight. If the M27C1001 is to be exposed to
these types of lighting conditions for extended pe-
riods of time, it is suggested that opaque labels be
put over the M27C1001 window to prevent unin-
tentional erasure. The recommended erasure pro-
cedure for the M27C1001 is exposure to short
wave ultraviolet light which has a wavelength of
2537 Å. The integrated dose (i.e. UV intensity x
exposure time) for erasure should be a minimum
of 15 W-sec/cm
2
. The erasure time with this dos-
age is approximately 15 to 20 minutes using an ul-
traviolet lamp with 12000 µW/cm
2
power rating.
The M27C1001 should be placed within 2.5 cm (1
inch) of the lamp tubes during the erasure. Some
lamps have a filter on their tubes which should be
removed before erasure.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

M27C1001-10C6

Mfr. #:
Buy M27C1001-10C6
Manufacturer:
STMicroelectronics
Description:
EPROM OTP 1Mx8
Lifecycle:
New from this manufacturer.
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