The M27W801 is a low voltage 8 Mbit EPROM offered in the two ranges UV (ultra violet erase) and
OTP (one time programmable). It is ideally suited
for microprocessor systems requiring large data or
program storage and is organized as1,048,576by
8 bits.
The M27W801 operates in the read mode with a
supply voltage as low as 2.7V at –40 to 85°C temperature range. The decrease in operating power
allows either a reduction of the size of the battery
or an increase in the time between battery recharges.
The FDIP32W (window ceramic frit-seal package)
has a transparent lids which allow the user to expose the chip to ultraviolet light to erase thebitpattern. A new pattern can then be written to the
device by following the programming procedure.
For applications wherethe content is programmed
only one time and erasure is not required, the
M27W801 is offered in PDIP32, PLCC32 and
TSOP32 (8 x 20 mm) packages.
Note: 1. Except for the rating ”Operating Temperature Range”, stresses above those listed in the Table ”Absolute Maximum Ratings” may
cause permanent damage to the device. These are stress ratings only and operation of thedevice at theseor anyother conditions
above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extendedperiods may affect device reliability. Refer alsoto the STMicroelectronics SUREProgram andotherrelevant quality documents.
2. Minimum DC voltage on Input or Output is –0.5V with possible undershoot to –2.0V for a period less than 20ns. Maximum DC
voltage on Output is V
3. Depends on range.
Ambient Operating Temperature
Temperature Under Bias–50 to 125°C
Storage Temperature–65 to 150°C
Input or Output Voltage (except A9)–2 to 7V
Supply Voltage–2 to 7V
A9 Voltage–2 to 13.5V
Program Supply Voltage–2 to 14V
+0.5V with possible overshoot to VCC+2V for a period less than 20ns.
CC
(3)
–40 to 125°C
Table 3. Operating Modes
ModeE
Read
Output DisableV
Program
V
Program InhibitV
Standby
Electronic Signature
Note: X = VIHor VIL,VID= 12V ± 0.5V.
V
IL
IL
PulseV
IL
IH
V
IH
V
IL
GV
V
V
PP
V
IL
IH
PP
PP
A9Q7-Q0
XData Out
XHi-Z
XData In
XHi-Z
XXHi-Z
V
IL
V
ID
Codes
Table 4. Electronic Signature
IdentifierA0Q7Q6Q5Q4Q3Q2Q1Q0Hex Data
Manufacturer’s Code
Device Code
V
IL
V
IH
00100000 20h
01000010 42h
3/16
Page 4
M27W801
Table 5. AC Measurement Conditions
High SpeedStandard
Input Rise and Fall Times≤ 10ns≤ 20ns (10% to 90%)
Input Pulse Voltages0 to 3V0.4V to 2.4V
Input and Output Timing Ref. Voltages1.5V0.8V and 2V
Figure 3. AC Testing Input Output Waveform
High Speed
3V
1.5V
0V
Standard
2.4V
0.4V
Table 6. Capacitance
SymbolParameterTest ConditionMinMaxUnit
C
IN
C
OUT
Note: 1. Sampled only, not 100% tested.
(1)
(TA=25°C, f = 1 MHz)
Input Capacitance
Output Capacitance
2.0V
0.8V
AI01822
Figure 4. AC Testing Load Circuit
1.3V
DEVICE
UNDER
TEST
CL= 30pFfor HighSpeed
CL= 100pF for Standard
CLincludes JIG capacitance
V
=0V
IN
V
=0V
OUT
1N914
3.3kΩ
C
L
6pF
12pF
OUT
AI01823B
DEVICE OPERATION
The operating modes of the M27W801 are listed in
the Operating Modes table. A single power supply
is required in the read mode. All inputs are TTL
levels except for GVPPand 12V on A9 for Electronic Signature and Margin Mode Set or Reset.
Read Mode
The M27W801 has two control functions, both of
which must be logically active in order to obtain
data at the outputs. Chip Enable (E) is the power
control and should be used for device selection.
Output Enable(G)is the output control and should
be used to gate data to the output pins, independent of device selection. Assuming that the addresses are stable, the address access time
4/16
(t
) is equal to the delay from E to output
AVQV
(t
). Data is available attheoutputafteradelay
ELQV
of t
from the falling edge of G, assuming that
GLQV
E has been low and the addresses have been stable for at least t
AVQV-tGLQV
.
Standby Mode
The M27W801 has a standby mode which reduces the supply current from 15mA to 20µA with low
voltage operation VCC≤ 3.6V, see ReadMode DC
Characteristics table for details. The M27W801 is
placed in the standby mode by applying a CMOS
high signal to the E input. When in the standby
mode, the outputs are in a high impedance state,
independent of the GVPPinput.
Page 5
M27W801
Table 7. Read Mode DC Characteristics
(1)
(TA= –40 to 85 °C; VCC= 2.7V to 3.6V; VPP=VCC)
SymbolParameterTest ConditionMinMaxUnit
I
I
I
CC
I
CC1
I
CC2
I
V
V
IH
V
V
Note: 1. VCCmust be applied simultaneously with or before VPPand removed simultaneously or after VPP.
Two Line Output Control
Because EPROMs are usually used in larger
memory arrays, the product features a 2 line control function which accommodates the use of multiple memory connection. The two line control
function allows:
a. the lowest possible memory power dissipation,
b. complete assurance that output bus contention
will not occur.
For the most efficient use of these two control
lines, Eshould be decoded and used as the primary device selecting function, while G should be
made a common connection to all devices in the
array and connected to the READ line from the
system controlbus. This ensures that all deselected memory devices are intheir low power standby
mode and that the output pins are only active
when data is required from a particular memory
device.
Input Leakage Current
LI
Output Leakage Current
LO
Supply Current
Supply Current (Standby) TTL
Supply Current (Standby) CMOS
Program Current
PP
Input Low Voltage–0.6
IL
(2)
Input High Voltage
Output Low Voltage
OL
Output High VoltageTTL
OH
2. Maximum DC voltage on Output is V
CC
+0.5V.
E=V
0V ≤ V
0V ≤ V
,GVPP=VIL,I
IL
f = 5MHz, V
E>V
CC
≤ V
IN
CC
≤ V
OUT
E=V
–0.2V,VCC≤ 3.6V
V
PP=VCC
I
= 2.1mA
OL
I
= –1mA
OH
CC
IH
CC
OUT
≤ 3.6V
System Considerations
The power switching characteristics of Advanced
CMOS EPROMs require careful decoupling of the
devices. The supply current, ICC, has three segments that are of interest to the system designer:
the standby current level, the active current level,
and transient current peaks that are produced by
the falling and rising edges of E. The magnitude of
the transient current peaks is dependent on the
capacitive and inductive loading of the device at
the output. The associatedtransient voltagepeaks
can be suppressed by complying with the two line
outputcontrol and byproperly selected decoupling
capacitors.It is recommended that a 0.1µFceramic capacitor be used on every device between V
and VSS. This should be a high frequency capacitor of low inherent inductance and should be
placed as close to the device as possible. In addition, a 4.7µF bulk electrolytic capacitor should be
used between VCCand VSSfor every eight devic-
= 0mA,
±10µA
±10µA
15mA
1mA
15µA
10µA
0.2 V
CC
0.7 V
CCVCC
3.6V
+ 0.5
0.4V
es. The bulk capacitor should be located near the
power supply connection point. The purposeof the
bulk capacitor is to overcome the voltage drop
caused by the inductive effects of PCB traces.
V
V
CC
5/16
Page 6
M27W801
Table 8. Read Mode AC Characteristics
(1)
(TA= –40 to 85 °C; VCC= 2.7V to 3.6V; VPP=VCC)
M27W801
(3)
SymbolAltParameter
Test
Condition
VCC= 3.0V to 3.6V VCC= 2.7V to 3.6V VCC= 2.7V to 3.6V
MinMaxMinMaxMinMax
E=V
G=V
G=V
E=V
G=V
E=V
E=V
G=V
,
IL
IL
IL
IL
IL
IL
,
IL
IL
050060070ns
050060070ns
000ns
t
AVQV
t
ELQV
t
GLQV
(2)
t
EHQZ
(2)
t
GHQZ
t
AXQX
Note: 1. VCCmust be applied simultaneously with or before VPPand removed simultaneously or after VPP.
2. Sampled only, not 100% tested.
3. Speed obtained with High Speed AC measurement conditions.
Note: 1. VCCmust be applied simultaneously with or before VPPand removed simultaneously or after VPP.
t
t
t
AS10VA10
t
AS10VA10
t
AH10
t
t
VA9High to VPPHigh
AS9
VPPHigh to Chip Enable Low
VPS
Chip Enable Transition to V
Chip Enable Transition to VPPTransition2µs
VPH
VPPTransition to VA9Transition
AH9
High to Chip Enable High (Set)
Low to Chip Enable High (Reset)
Transition
A10
2µs
2µs
1µs
1µs
1µs
2µs
Programming
The M27W801 hasbeen designedto be fully compatible with the M27C801 and has the same electronic signature. As a result the M27W801 can be
programmed as the M27C801 on the same programming equipmentapplying 12.75V on VPPand
6.25V on VCCby the use ofthe same PRESTO IIB
algorithm. When delivered (and after each‘1’s erasure for UV EPROM), all bits of the M27W801 are
in the ”1” state. Data is introduced by selectively
programming ”0”s into the desired bit locations.Al-
though only ’0’ will be programmed, both ”1” and
”0” can be present in the data word. The only way
to change a ‘0’ to a ‘1’ is by die exposure to ultraviolet light (UV EPROM). The M27W801 is in the
programming mode when VPPinput is at 12.75V
and E is pulsed toVIL. The data to be programmed
is applied to 8 bits in parallel to the data output
pins. The levels required for the address and data
inputs are TTL. VCCis specified to be 6.25V ±
Note: 1. VCCmust be applied simultaneously with or before VPPand removed simultaneously or after VPP.
2. Sampled only, not 100% tested.
t
t
t
VCS
t
OES
t
PRT
t
PW
t
t
OEH
t
t
t
DFP
t
Address Valid to Chip Enable Low2µs
AS
Input Valid to Chip Enable Low2µs
DS
VCCHigh to Chip Enable Low
VPPHigh to Chip Enable Low
2µs
2µs
VPPRise Time50ns
Chip Enable Program Pulse Width (Initial)4555µs
Chip Enable High to Input Transition2µs
DH
Chip Enable High to VPPTransition
VPPLow to Chip Enable Low
VR
Chip Enable Low to Output Valid1µs
DV
2µs
2µs
Chip Enable High to Output Hi-Z0130ns
Chip Enable High to Address Transition0ns
AH
Figure 6. MARGIN MODE AC Waveforms
V
CC
A8
A9
tA9HVPHtVPXA9X
GV
PP
E
A10 Set
A10 Reset
tVPHEL
tA10HEH
tA10LEH
tEXVPX
tEXA10X
AI00736B
Note: A8 High level = 5V; A9 High level = 12V.
8/16
Page 9
Figure 7. Programming and Verify Modes AC Waveforms
M27W801
A0-A19
tAVEL
Q0-Q7
tQVEL
V
CC
tVCHEL
GV
PP
tVPHEL
E
Figure 8. Programming Flowchart
VCC= 6.25V, VPP= 12.75V
SET MARGIN MODE
n=0
E=50µs Pulse
NO
NO
VERIFY
YES
Last
NO
Addr
YES
RESET MARGINMODE
CHECK ALL BYTES
1st: VCC=5V
2nd: VCC= 2.7V
++ Addr
YES
++n
=25
FAIL
VALID
DATA INDATAOUT
tEHQX
tEHVPXtELQV
tVPLEL
tELEH
PROGRAMVERIFY
PRESTO IIB Programming Algorithm
PRESTO IIB Programming Algorithm allows the
whole array to be programmed with a guaranteed
margin, in a typical timeof 52.5 seconds. This can
be achieved with STMicroelectronics M27W801
due to several design innovations to improve programming efficiency and to provide adequate margin for reliability. Before starting the programming
the internal MARGIN MODE circuit must be set in
order to guarantee that each cell is programmed
with enough margin. Then a sequence of 50µs
program pulses are applied to each byte until a
correct verify occurs (see Figure 8). No overprogram pulses are applied since the verify in MARGIN MODE at VCCmuch higher than 3.6V,
provides the necessary margin.
Program Inhibit
Programming of multiple M27W801s in parallel
with different data is alsoeasily accomplished. Except for E, alllike inputs including GVPPof the parallel M27W801 may be common. A TTL low level
pulse applied to a M27W801’s E input, with VPPat
12.75V, will program that M27W801. A high level
E input inhibits the other M27W801s from being
programmed.
Program Verify
A verify (read) should be performed on the programmed bits to determinethat they were correct-
AI01271C
ly programmed. The verify is accomplished with G
at VIL. Data should be verified with t
falling edge of E.
tEHAX
tEHQZ
AI01270
ELQV
after the
9/16
Page 10
M27W801
On-Board Programming
The M27W801 can be directly programmed in the
application circuit. See the relevant Application
Note AN620.
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 ambient temperaturerange that is required when programming the M27W801. To activate the ES
mode, the programming equipment must force
11.5V to 12.5V on address line A9 of the
M27W801. Two identifier bytes may then be sequenced from the device outputs by toggling address line A0 from VILto VIH. All other address
lines must be held at VILduring Electronic Signature mode.
Byte 0 (A0 = VIL) represents the manufacturer
code and byte 1 (A0 = VIH) the device identifier
code. For the STMicroelectronics M27W801,
these two identifier bytes are given in Table 4 and
can be read-out on outputs Q7 to Q0.
Note that the M27W801 and M27C801 have the
same identifier byte.
ERASURE OPERATION (applies to UV EPROM)
The erasure characteristics of the M27W801 is
such that erasure begins when the cells are exposed to light with wavelengths shorter than approximately 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 fluorescent lighting could erase a typical
M27W801 in about 3years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27W801 is to be
exposed to these types of lighting conditions for
extended periods of time, it is suggested that
opaque labels be put over the M27W801 window
to prevent unintentional erasure. The recommended erasure procedure for the M27W801 is exposure to short wave ultraviolet light which has
wavelength 2537 Å. The integrated dose (i.e. UV
intensity x exposure time) for erasure should be a
minimum of 30 W-sec/cm2. The erasure time with
this dosage is approximately 30 to 40 minutes using an ultraviolet lamp with 12000 µW/cm2power
rating. The M27W801 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.
10/16
Page 11
Table 12. Ordering Information Scheme
Example:M27W801-80 K6 TR
Device Type
M27
Supply Voltage
W = 2.7V to 3.6V
Device Function
801 = 8 Mbit (1Mb x8)
Speed
(1,2)
-100
-120 = 120 ns
=80ns
M27W801
Not For New Design
(3)
-150 = 150 ns
-200 = 200 ns
Package
F = FDIP32W
(4)
B = PDIP32
K = PLCC32
N = TSOP32: 8 x 20 mm
(4)
Temperature Range
6=–40to85°C
Options
TR = Tape& Reel Packing
Note: 1. High Speed, see AC Characteristics section for further information.
2. This speed also guarantees 80ns access time at V
3. These speeds are replaced by the 120ns.
4. Packages option available on request. Please contact STMicroelectronics local Sales Office.
= 3.0V to 3.6V.
CC
For a list of available options (Speed, Package, etc...) or for further information on any aspect of this device, please contact the STMicroelectronics Sales Office nearest to you.
Table 13. Revision History
DateRevision Details
July 1999First Issue
FDIP32W Package Dimension, L Max added (Table 14)
03/15/00
04/21/00
TSOP32 Package Dimension changed (Table 17)
0to70°C Temperature Range deleted
Programming Time changed
Read Mode AC Characteristics: t
AVQV,tELQV,tGLQV,tEHQZ,tGHQZ
changed (Table 8)
11/16
Page 12
M27W801
Table 14. FDIP32W - 32 pin Ceramic Frit-seal DIP, with window, Package Mechanical Data
Figure 12. TSOP32 - 32 lead Plastic Thin Small Outline, 8 x 20 mm, Package Outline
A2
1N
e
E
B
N/2
D1
D
DIE
A
CP
C
TSOP-a
Drawing is not to scale.
LA1α
15/16
Page 16
M27W801
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information norfor any infringement of patents orother rights of third parties which may result from itsuse. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is registered trademark of STMicroelectronics
2000 STMicroelectronics - All Rights Reserved
All other names are the property of their respective owners.
Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco -
Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A.
STMicroelectronics GROUP OF COMPANIES
http://www.st.com
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