512 Kbit (64Kb x8) Low Voltage UV EPROM and OTP EPROM
■ LOW VOLTAGE READ OPERATION:
3V to 3.6V
■ FAST ACCESS TIME: 100ns
■ LOW POWER CONSUMPTION:
V
CC
M27V512
28
1
8 x 13.4mm
8
Q0-Q7
– Active Current 10mA at 5MHz
– Standby Current 10µA
■ PROGRAMMING VOLTAGE: 12.75V ± 0.25V
■ PROGRAMMING TIME: 100µs/byte (typical)
■ ELECTRONIC SIGNATURE
– Manufacturer Code: 20h
– Device Code: 3Dh
DESCRIPTION
The M27V512 is a low voltage 512 Kbit EPROM
offered in the two ranges UV (ultra viloet erase)
and OTP (one time programmable). It is ideally
suited for microprocessor systems and is organized as 65,536 by 8 bits.
The M27V512 operates in the read mode with a
supply voltage as low as 3V. 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 FDIP28W (window ceramic frit-seal package)
has transparent lid which allows the user to expose the chiptoultraviolet light to erase the bit pattern. A new pattern can then be written to the
device by following the programming procedure.
For applications where the content is programmed
only one time and erasure is not required, the
M27V512 is offered in PDIP28, PLCC32 and
TSOP28 (8 x 13.4 mm) packages.
Table 1. Signal Names
A0-A15Address Inputs
28
1
FDIP28W (F)PDIP28 (B)
PLCC32 (K)TSOP28 (N)
Figure 1. Logic Diagram
16
A0-A15
E
GV
PP
Q0-Q7Data Outputs
EChip Enable
GV
V
V
PP
CC
SS
Output Enable
Supply Voltage
Ground
V
SS
AI00732B
1/16May 1998
Page 2
M27V512
Figure 2A. DIP Pin Connections
A15V
A12
A7
A6
A5
A4
A3
A2
A1
A0
Q0
Q2
SS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
M27V512
28
27
26
25
24
23
22
21
20
19
18
17
16
15
AI01907
CC
A14
A13
A8
A9
A11
GV
A10
E
Q7
Q6
Q5Q1
Q4
Q3V
PP
Figure 2B. LCC Pin Connections
CC
A13
DU
32
DU
V
Q3
A14
Q4
25
Q5
A8
A9
A11
NC
GV
A10
E
Q7
Q6
AI00733B
A15
A7
A12
A6
A5
A4
A3
A2
9
A1
A0
NC
Q0
Q1
Warning: NC = Not Connected, DU = Don’t Use
1
M27V512
17
Q2
SS
V
PP
Figure 2C. TSOP Pin Connections
GV
A11
A13
A14
V
A15
A12
PP
A9
A8
CC
A7
A6
A5
A4
A3
22
28
M27V512
1
78
21
15
14
AI00734B
A10
E
Q7
Q6
Q5
Q4
Q3
V
SS
Q2
Q1
Q0
A0
A1
A2
DEVICE OPERATION
The operating modes of the M27V512 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.
Read Mode
The M27V512 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
(t
) is equal to the delay from E to output
AVQV
(t
). Datais availableatthe output afteradelay
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 M27V512 has a standby mode which reduces
the supply current from 10mA to 10µA with low
voltage operation VCC≤ 3.6V, see Read Mode DC
Characteristics table for details.The M27V512 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.
2/16
Page 3
M27V512
Table 2. Absolute Maximum Ratings
(1)
SymbolParameterValueUnit
T
A
T
BIAS
T
STG
(2)
V
IO
V
CC
(2)
V
A9
V
PP
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 the device at these or any other conditions
above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer alsoto the STMicroelectronics SUREProgram and other relevant 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
PP
V
IL
V
IH
PP
PP
A9Q0-Q7
XData Out
XHi-Z
XDataIn
XHi-Z
XXHi-Z
V
IL
V
ID
Codes
Table 4. Electronic Signature
IdentifierA0Q7Q6Q5Q4Q3Q2Q1Q0Hex Data
Manufacturer’s Code
Device Code
V
IL
V
IH
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.
00100000 20h
00111101 3Dh
For the most efficient use of these two control
lines, Eshouldbedecoded and used astheprimary 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 control bus. This ensures that all deselected memory devices are intheir lowpower standby
mode and that the output pins are only active
when data is required from a particular memory
device.
3/16
Page 4
M27V512
Table 5. AC Measurement Conditions
High SpeedStandard
Input Rise and Fall Times≤ 10ns≤ 20ns
Input Pulse Voltages0 to 3V0.4V to 2.4V
Input and Output Timing Ref. Voltages1.5V0.8V and 2V
Figure 3. 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.
Input Capacitance
Output Capacitance
(1)
(TA=25°C, f = 1 MHz)
2.0V
0.8V
AI01822
Figure 4. AC Testing Load Circuit
1.3V
1N914
3.3kΩ
DEVICE
UNDER
TEST
C
L
CL= 30pF for HighSpeed
CL= 100pF for Standard
CLincludes JIG capacitance
V
V
IN
OUT
=0V
=0V
6pF
12pF
OUT
AI01823B
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 edgesof E. The magnitude of
the transient current peaks is dependent on the
capacitive and inductive loading of the device at
the output.
The associated transient voltage peaks can be
suppressed by complying with the two line output
4/16
control and by properly selected decoupling capacitors. It is recommended that a 0.1µF ceramic
capacitor be used on every device between V
CC
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 devices. The bulk capacitor should be located near the
power supplyconnection point.The purpose of the
bulk capacitor is to overcome the voltage drop
caused by the inductive effects of PCB traces.
Page 5
M27V512
Table 7. Read Mode DC Characteristics
(1)
(TA= 0 to 70 °C or –40 to 85 °C; VCC= 3.3V ± 10%; VPP=VCC)
SymbolParameterTest ConditionMinMaxUnit
I
I
I
CC
I
CC1
I
CC2
I
V
V
IH
V
V
V
Note: 1. VCCmust be applied simultaneously with or before VPPand removed simultaneously or after VPP.
Table 8A. Read Mode AC Characteristics
Input Leakage Current
LI
Output Leakage Current
LO
Supply Current
E=V
IL
f = 5MHz, V
0V ≤ V
0V ≤ V
,G=VIL,I
Supply Current (Standby) TTL
Supply Current (Standby) CMOS
Program Current
PP
Input Low Voltage–0.30.8V
IL
(2)
Input High Voltage2
Output Low Voltage
OL
Output High Voltage TTL
OH
Output High Voltage CMOS
OH
2. Maximum DC voltage on Output is V
CC
+0.5V.
(1)
E>V
CC
I
I
OH
OH
≤ V
IN
CC
≤ V
OUT
E=V
CC
IH
CC
OUT
≤ 3.6V
= 0mA,
– 0.2V,VCC≤ 3.6V
V
PP=VCC
I
= 2.1mA
OL
= –400µA
= –100µAV
2.4V
– 0.7V
CC
±10µA
±10µA
10mA
1mA
10µA
10µA
V
+1
CC
0.4V
(TA= 0 to 70 °C or –40 to 85 °C; VCC= 3.3V ± 10%; VPP=VCC)
M27V512
SymbolAltParameterTest Condition
(3)
-100
MinMaxMinMax
-120
V
V
Unit
t
AVQV
t
ELQV
t
GLQV
t
EHQZ
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.
(2)
(2)
t
Address Valid to Output ValidE = VIL,G=V
ACC
t
Chip Enable Low to Output Valid
CE
t
Output Enable Low to Output Valid
OE
t
Chip Enable High to Output Hi-ZG = V
DF
t
Output Enable High to Output Hi-Z
DF
Address Transition to Output
t
OH
Transition
E=V
G=V
E=V
E=V
,G=V
IL
IL
IL
IL
IL
IL
IL
030035ns
030035ns
00ns
100120ns
100120ns
4545ns
5/16
Page 6
M27V512
Table 8B. Read Mode AC Characteristics
(1)
(TA= 0 to 70 °C or –40 to 85 °C; VCC= 3.3V ± 10%; VPP=VCC))
M27V512
SymbolAltParameterTest Condition
MinMaxMinMax
t
AVQV
t
ELQV
t
GLQV
t
EHQZ
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.
(2)
(2)
t
Address Valid to Output Valid
ACC
t
Chip Enable Low to Output Valid
CE
t
Output Enable Low to Output ValidE = V
OE
t
Chip Enable High to Output Hi-Z
DF
t
Output Enable High to Output Hi-Z
DF
Address Transition to Output
t
OH
Transition
E=V
E=V
,G=V
IL
G=V
G=V
E=V
,G=V
IL
IL
IL
IL
IL
IL
IL
040050ns
040050ns
00ns
Figure 5. Read Mode AC Waveforms
A0-A15
tAVQV
VALID
tAXQX
VALID
Unit-150-200
150200ns
150200ns
5060ns
E
tGLQV
G
tELQV
Q0-Q7
Programming
The M27V512 has been designed to be fully compatible with the M27C512 and has the same electronic signature. As a result the M27V512 can be
programmed as the M27C512 on the same programming equipments applying 12.75V on V
PP
and 6.25V on VCCby the use of the same PRESTO IIB algorithm. When delivered (and after each
erasure for UV EPROM), all bits of the M27V512
are inthe ’1’ state. Data is introduced by selectively programming ’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. Theonly
way tochange a ’0’to a ’1’is by die exposure to ul-
tEHQZ
tGHQZ
Hi-Z
AI00735B
traviolet light(UV EPROM). The M27V512 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 ±
0.25V.
The M27V512 can use PRESTO IIBProgramming
Algorithm that drastically reduces the programming time (typically less than 6 seconds). Neverthelesstoachievecompatibilitywithall
programming equipments, PRESTO Programming Algorithm can be used as well.
Note: 1. VCCmust be applied simultaneously with or before VPPand removed simultaneously or after VPP.
Input Leakage Current
Supply Current50mA
Program Current
Input Low Voltage–0.30.8V
Input High Voltage2VCC+ 0.5V
Output Low Voltage
Output High Voltage TTLIOH= –1mA3.6V
A9 Voltage11.512.5V
Table 10. MARGIN MODE AC Characteristics
V
<= VIN<=V
IL
E=V
I
= 2.1mA
OL
(1)
IH
IL
±10µA
50mA
0.4V
(TA=25°C; VCC= 6.25V ± 0.25V; VPP= 12.75V ± 0.25V
SymbolAltParameterTest ConditionMinMaxUnit
t
A9HVPH
t
VPHEL
t
A10HEH
t
A10LEH
t
EXA10X
t
EXVPX
t
VPXA9X
Note: 1. VCCmust be applied simultaneously with or before VPPand removed simultaneously or after V
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)
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
t
t
OEH
t
t
t
DFP
t
Address Validto 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)95105µs
PW
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
Note: A8 Highlevel = 5V; A9 High level = 12V.
tVPHEL
tA10HEH
tA10LEH
tEXVPX
tEXA10X
AI00736B
8/16
Page 9
Figure 7. Programming and Verify Modes AC Waveforms
M27V512
A0-A15
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 = 100µs Pulse
NO
NO
VERIFY
YES
Last
NO
Addr
YES
RESET MARGINMODE
CHECK ALL BYTES
1st: VCC=6V
2nd: VCC= 4.2V
++ Addr
YES
++n
=25
FAIL
DATA IN
AI00738B
tELEH
PROGRAM
VALID
tEHAX
DATA OUT
tEHQX
tELQV
tEHVPX
tVPLEL
VERIFY
tEHQZ
AI00737
PRESTO IIB Programming Algorithm
PRESTO IIB Programming Algorithm allows the
whole array to be programmed with a guaranteed
margin, in a typical time of 6.5 seconds. This can
be achieved with STMicroelectronics M27V512
due to several design innovations described in the
M27V512 datasheet to improve programming efficiency and to provide adequate marginfor reliability. Before starting the programming the internal
MARGIN MODE circuit is set inorder to guarantee
that each cell is programmed with enough margin.
Then asequence of 100µs program pulses are applied to each byte until a correct verify occurs. No
overprogram pulses are applied since the verify in
MARGIN MODE provides the necessary margin.
Program Inhibit
Programming of multiple M27V512s in parallel
with different data is also easily accomplished. Except for E, all like inputs including GVPPof theparallel M27V512 may be common. A TTL low level
pulse applied to a M27V512’s E input, with VPPat
12.75V, will programthat M27V512. A high level E
input inhibits the other M27V512s from being programmed.
Program Verify
A verify (read) should be performed on the programmed bits to determinethat they were correctly programmed. The verify is accomplished with G
at VIL. Data should be verified with t
ELQV
after the
falling edge of E.
9/16
Page 10
M27V512
On-Board Programming
The M27V512 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 matchthe 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 theM27V512. To activate the ES mode,
the programming equipment must force 11.5V to
12.5V on address line A9 of the M27V512. 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 themanufacturer code
and byte 1 (A0=VIH) the device identifier code. For
the STMicroelectronics M27V512, these two identifier bytes are given in Table 4 and can be readout on outputs Q0 to Q7. Note that the M27V512
and M27C512 have the same identifier bytes.
ERASURE OPERATION (applies for UV EPROM)
The erasure characteristics of the M27V512 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
M27V512 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27V512 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 M27V512 window to
prevent unintentional erasure. The recommended
erasureprocedure for the M27V512 is exposureto
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 15 W-sec/cm2. The erasure time with this dosage is approximately 15 to 20 minutes using an ultraviolet lamp with 12000 µW/cm2power rating.
The M27V512 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:M27V512-100 K1 TR
Device Type
Speed
(1)
-100
-120 = 120 ns
-150 = 150 ns
-200 = 200 ns
Package
F = FDIP28W
B = PDIP28
K = PLCC32
N = TSOP28: 8 x 13.4mm
Temperature Range
1 = –0 to 70 °C
6=–40to85°C
= 100 ns
M27V512
Option
TR = Tape& Reel packing
Note: 1. High Speed, see AC Characteristics section for further information.
For a list of available options (Speed, Package, etc...) or for further information on any aspect of this device, please contact the ST Sales Office nearest to you.
11/16
Page 12
M27V512
Table 13. FDIP28W - 28 pin Ceramic Frit-seal DIP, with window, Package Mechanical Data
Table 16. TSOP28 - 28 lead Plastic Thin Small Outline, 8 x 13.4mm, Package Mechanical Data
Symb
TypMinMaxTypMinMax
A1.250.049
A10.200.008
A20.951.150.0370.045
B0.170.270.0070.011
C0.100.210.0040.008
D13.2013.600.5200.535
D111.7011.900.4610.469
E7.908.100.3110.319
e0.55––0.022––
L0.500.700.0200.028
α0°5°0°5°
N2828
CP0.100.004
mminches
Figure 12. TSOP28 - 28 lead Plastic Thin Small Outline, 8 x 13.4mm, Package Outline
A2
22
21
e
28
1
E
B
78
D1
D
DIE
A
CP
C
TSOP-c
Drawing is not to scale
LA1α
15/16
Page 16
M27V512
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of useofsuch information norfor any infringement of patents or other 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
1998 STMicroelectronics - All Rights Reserved
All other names are the property of their respective owners.
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
STMicroelectronics GROUP OF COMPANIES
http://www.st.com
16/16
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