MX27C256
256K-BIT [32K x 8] CMOS EPROM
FEATURES
•
•
•
•
•
•
32K x 8 organization
Single +5V power supply
+12.5V programming voltage
Fast access time: 45/55/70/90/100/120/150 ns
Totally static operation
Completely TTL compatible
• Operating current: 30mA
• Standby current: 100uA
• Package type:
- 28 pin plastic DIP
- 32 pin PLCC
- 28 pin 8 x 13.4mm TSOP(I)
GENERAL DESCRIPTION
The MX27C256 is a 5V only, 256K-bit, One-Time
Programmable Read Only Memory. It is organized as
32K by 8 bits, operates from a single + 5volt supply, has
a static standby mode, and features fast single address
location programming. All programming signals are TTL
levels, requiring a single pulse. For programming from
outside the system, existing EPROM programmers
may be used. The MX27C256 supports intelligent fast
programming algorithm which can result in programming time of less than ten seconds.
PIN CONFIGURATIONS
BLOCK DIAGRAM
PDIP
A6
30
29
A9
A4
A11
A2
NC
9
25
MX27C256
OE
A1
A10
A0
Q7
21
20
Q4
Q3
17
22
23
24
25
26
27
28
1
2
3
4
5
6
7
P/N: PM0203
MX27C256
Q0~Q7
Q6
.
.
.
.
.
.
.
.
VCC
GND
Y-DECODER
X-DECODER
.
.
.
.
.
.
.
.
Y-SELECT
256K BIT
CELL
MAXTRIX
VPP
Q5
13
14
NC
Q0
PIN DESCRIPTION
8 x 13.4mm 28-TSOP(I)
OE
A11
A9
A8
A13
A14
VCC
VPP
A12
A7
A6
A5
A4
A3
A0~A14
ADDRESS
INPUTS
CE
NC
OUTPUT
BUFFERS
A8
A5
A3
CONTROL
LOGIC
CE
OE
A13
32
A14
VCC
VPP
A12
1
4
NC
5
GND
VCC
A14
A13
A8
A9
A11
OE
A10
CE
Q7
Q6
Q5
Q4
Q3
Q2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Q1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A7
PLCC
MX27C256
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
Q0
Q1
Q2
GND
This EPROM is packaged in industry standard 28 pin
dual-in-line packages, 32 lead PLCC, and 28 lead
TSOP(I) packages.
SYMBOL
21
20
19
18
17
16
15
14
13
12
11
10
9
8
A0~A14
Data Input/Output
CE
Chip Enable Input
OE
Output Enable Input
VPP
Program Supply Voltage
NC
No Internal Connection
VCC
Power Supply Pin (+5V)
GND
1
Address Input
Q0~Q7
A10
CE
Q7
Q6
Q5
Q4
Q3
GND
Q2
Q1
Q0
A0
A1
A2
PIN NAME
Ground Pin
REV. 5.6, AUG. 26, 2003
