1998 Microchip Technology Inc.
DS11173F-page 1
27C512A
FEATURES
High speed performance
CMOS Technology for low power consumption
- 25 mA Active current
- 30
A Standby current
Factory programming available
Auto-insertion-compatible plastic packages
Auto ID aids automated programming
High speed express programming algorithm
Organized 64K x 8: JEDEC standard pinouts
- 28-pin Dual-in-line package
- 32-pin PLCC Package
- 28-pin SOIC package
- Tape and reel
Data Retention > 200 years
Available for the following temperature ranges
- Commercial:
0C to +70C
- Industrial:
-40C to +85C
- Automotive:
-40C to +125C
DESCRIPTION
The Microchip Technology Inc. 27C512A is a CMOS
512K bit electrically Programmable Read Only Memory
(EPROM). The device is organized into 64K words by
8 bits (64K bytes). Accessing individual bytes from an
address transition or from power-up (chip enable pin
going low) is accomplished in less than 90 ns. This
very high speed device allows the most sophisticated
microprocessors to run at full speed without the need
for WAIT states. CMOS design and processing
enables this part to be used in systems where reduced
power consumption and high reliability are require-
ments.
A complete family of packages is offered to provide the
most flexibility in applications. For surface mount appli-
cations, PLCC or SOIC packaging is available. Tape or
reel packaging is also available for PLCC or SOIC
packages.
PACKAGE TYPES
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
V
SS
V
CC
A14
A13
A8
A9
A11
OE/V
PP
A10
CE
O7
O6
O5
O4
O3
A6
A5
A4
A3
A2
A1
A0
NC
O0
A8
A9
A11
NC
OE/V
PP
A10
CE
O7
O6
A7
A12
A15
NU
Vcc
A14
A13
O1
O2
V
NU
O3
O4
O5
SS
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
14
15
16
17
18
19
20
4
3
2
1
32
31
30
PLCC
DIP/SOIC
27C512A
27C512A
512K (64K x 8) CMOS EPROM
27C512A
DS11173F-page 2
1998 Microchip Technology Inc.
1.0
ELECTRICAL CHARACTERISTICS
1.1
Maximum Ratings*
V
CC
and input voltages w.r.t. V
SS
........ -0.6V to +7.25V
V
PP
voltage w.r.t. V
SS
during
programming ......................................... -0.6V to +14V
Voltage on A9 w.r.t. V
SS
....................... -0.6V to +13.5V
Output voltage w.r.t. V
SS
.................-0.6V to V
CC
+1.0V
Storage temperature .......................... -65C to +150C
Ambient temp. with power applied...... -65C to +125C
*Notice: Stresses above those listed under "Maximum Ratings"
may cause permanent damage to the device. This is a stress rat-
ing only and functional operation of the device at those or any
other conditions above those indicated in the operation listings of
this specification is not implied. Exposure to maximum rating con-
ditions for extended periods may affect device reliability.
TABLE 1-1:
PIN FUNCTION TABLE
Name
Function
A0-A15
Address Inputs
CE
Chip Enable
OE/V
PP
Output Enable/Programming Voltage
O0 - O7
Data Output
V
CC
+5V Power Supply
V
SS
Ground
NC
No Connection; No Internal Connec-
tion
NU
Not Used; No External Connection is
Allowed
TABLE 1-2:
READ OPERATION DC CHARACTERISTICS
V
CC
= +5V
10%
Commercial:
Tamb = 0C to +70C
Industrial:
Tamb = -40C to +85C
Extended (Automotive):
Tamb = -40C to +125C
Parameter
Part*
Status
Symbol
Min
Max
Units
Conditions
Input Voltages
all
Logic "1"
Logic "0"
V
IH
V
IL
2.0
-0.5
V
CC
+1
0.8
V
V
Input Leakage
all
I
LI
-10
10
A
V
IN
= 0 to V
CC
Output Voltages
all
Logic "1"
Logic "0"
V
OH
V
OL
2.4
0.45
V
V
I
OH
= - 400
A
I
OL
= 2.1 mA
Output Leakage
all
--
I
LO
-10
10
A
V
OUT
= 0V to V
CC
Input Capacitance
all
--
C
IN
--
6
pF
V
IN
= 0V; Tamb = 25
C;
f = 1 MHz
Output Capacitance
all
--
C
OUT
--
12
pF
V
OUT
= 0V; Tamb = 25
C;
f = 1 MHz
Power Supply Current,
Active
C
I, E
TTL input
TTL input
I
CC
I
CC
--
--
25
35
mA
mA
V
CC
= 5.5V
f = 1 MHz;
OE/V
PP
= CE = V
IL
;
I
OUT
= 0 mA;
V
IL
= -0.1 to 0.8V;
V
IH
= 2.0 to V
CC
;
Note 1
Power Supply Current,
Standby
C
I, E
all
TTL input
TTL input
CMOS input
I
CC
(
S
)
TLL
I
CC
(
S
)
TLL
I
CC
(
S
)
CMOS
--
--
--
1
2
30
mA
mA
A
CE = Vcc
0.2V
* Parts: C=Commercial Temperature Range; I, E=Industrial and Extended Temperature Ranges
Note 1: Typical active current increases .75 mA per MHz up to operating frequency for all temperature ranges.
1998 Microchip Technology Inc.
DS11173F-page 3
27C512A
TABLE 1-3:
READ OPERATION AC CHARACTERISTICS
FIGURE 1-1:
READ WAVEFORMS
AC Testing Waveform:
V
IH
= 2.4V and V
IL
= .45V; V
OH
= 2.0V and V
OL
= 0.8V
Output Load:
1 TTL Load + 100 pF
Input Rise and Fall Times:
10 ns
Ambient Temperature:
Commercial:
Tamb = 0C to +70C
Industrial:
Tamb = -40C to +85C
Extended (Automotive):
Tamb = -40C to +125C
Parameter
Sym
27C512-90*
27C512-10*
27C512-12
27C512-15
Units Conditions
Min
Max
Min
Max
Min
Max
Min
Max
Address to Output
Delay
t
ACC
--
90
--
100
--
120
--
150
ns
CE = OE/
V
PP
= V
IL
CE to Output Delay
t
CE
--
90
--
100
--
120
--
150
ns
OE/V
PP
=
V
IL
OE to Output Delay
t
OE
--
40
--
40
--
50
--
60
ns
CE = V
IL
OE to Output High
Impedance
t
OFF
0
35
0
35
0
40
0
45
ns
Output Hold from
Address, CE or OE/
V
PP
, whichever
occurred first
t
OH
0
--
0
--
0
--
0
--
ns
*90/10 AC Testing Waveforms: V
IH
= 3.0V and V
IL
= 0V; V
OH
= 1.5V and V
OL
= 1.5V
Output Load: 1 TTL Load + 30 pF
Address
CE
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
OE
Outputs
O0 - O7
V
OH
V
OL
Address Valid
t
CE(2)
t
OE(2)
High Z
Valid Output
t
ACC
(1) t
OFF
is specified for OE or CE, whichever occurs first
(2) OE may be delayed up to t
CE
- t
OE
after the falling edge of CE without impact on t
CE
(3) This parameter is sampled and is not 100% tested.
High Z
t
OH
t
OFF(1,3)
Notes:
27C512A
DS11173F-page 4
1998 Microchip Technology Inc.
TABLE 1-4:
PROGRAMMING DC CHARACTERISTICS
TABLE 1-5:
PROGRAMMING AC CHARACTERISTICS
Ambient Temperature: Tamb = 25
C
5
C
V
CC
= 6.5V
0.25V, OE/V
PP
= V
H
= 13.0V
0.25V
Parameter
Status
Symbol
Min.
Max.
Units
Conditions (See Note 1)
Input Voltages
Logic "1"
Logic "0"
V
IH
V
IL
2.0
-0.1
V
CC
+1
0.8
V
V
Input Leakage
--
I
LI
-10
10
A
V
IN
= 0V to V
CC
Output Voltages
Logic "1"
Logic "0"
V
OH
V
OL
2.4
--
0.45
V
V
I
OH
= -400
A
I
OL
= 2.1 mA
V
CC
Current, program & verify
--
I
CC2
--
35
mA
CE = V
IL
OE/V
PP
Current, program
--
I
PP2
--
25
mA
A9 Product Identification
--
V
ID
11.5
12.5
V
Note 1: V
CC
must be applied simultaneously or before V
PP
voltage on OE/V
PP
and removed simultaneously or after
the V
PP
voltage on OE/V
PP
.
for Program, Program Verify
AC Testing Waveform:
V
IH
=2.4V and V
IL
=0.45V; V
OH
=2.0V; V
OL
=0.8V
and Program Inhibit Modes
Ambient Temperature:
25
C
5
C
V
CC
= 6.5V
0.25V, OE/V
PP
= V
H
= 13.0V
0.25 V
Parameter
Symbol
Min.
Max.
Units
Remarks
Address Set-Up Time
t
AS
2
--
s
Data Set-Up Time
t
DS
2
--
s
Data Hold Time
t
DH
2
--
s
Address Hold Time
t
AH
0
--
s
Float Delay (2)
t
DF
0
130
ns
V
CC
Set-Up Time
t
VCS
2
--
s
Program Pulse Width (1)
t
PW
95
105
s
100
s typical
CE Set-Up Time
t
CES
2
--
s
OE Set-Up Time
t
OES
2
--
s
OE Hold Time
t
OEH
2
--
s
OE Recovery Time
t
OR
2
--
s
OE /V
PP
Rise Time During Programming
t
PRT
50
--
ns
Note 1: For express algorithm, initial programming width tolerance is 100
s
5%.
2: This parameter is only sampled and not 100% teted. Output float is defined as the point where data is no
longer driven (see timing diagram).
1998 Microchip Technology Inc.
DS11173F-page 5
27C512A
FIGURE 1-2:
PROGRAMMING WAVEFORMS (1)
TABLE 1-6:
MODES
Operation Mode
CE
OE/V
PP
A9
O0 - O7
Read
V
IL
V
IL
X
D
OUT
Program
V
IL
V
H
X
D
IN
Program Verify
V
IL
V
IL
X
D
OUT
Program Inhibit
V
IH
V
H
X
High Z
Standby
V
IH
X
X
High Z
Output Disable
V
IL
V
IH
X
High Z
Identity
V
IL
V
IL
V
H
Identity Code
X = Don't Care
t
OPW
t
OEH
t
CE
(2)
V
IH
V
IL
V
IH
V
IL
6.5 V (3)
5.0V
V
IH
V
IL
Address
Data
V
CC
CE
Address Stable
t
DS
t
AS
Data In Stable
Data Out Valid
Verify
t
VCS
Notes:
The input timing reference level is 0.8V for V
IL
and 2.0V for V
IH
.
t
DF
and t
OE
are characteristics of the device but must be accommodated by the programmer.
V
CC
= 6.5V
0.25V, V
PP
= V
H
= 13.0V
0.5V for express programming algorithm.
(1)
(2)
(3)
t
DH
t
OR
t
DF
(2)
t
AH
t
PRT
t
CES
t
PW
t
OES
13.0 V (3)
V
IL
OE/V
PP
Program
1.2
Read Mode
(See Timing Diagrams and AC Characteristics)
Read Mode is accessed when
a)
the CE pin is low to power up (enable) the chip
b)
the OE/V
PP
pin is low to gate the data to the
output pins
For Read operations, if the addresses are stable, the
address access time (t
ACC
) is equal to the delay from
CE to output (t
CE
). Data is transferred to the output
after a delay (t
OE
) from the falling edge of OE/V
PP
.
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