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W27E257 Datasheet(PDF) 1 Page - Winbond

Part # W27E257
Description  32K X 8 ELECTRICALLY ERASABLE EPROM
Download  14 Pages
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W27E257 Datasheet(HTML) 1 Page - Winbond

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W27E257
32K
× 8 ELECTRICALLY ERASABLE EPROM
Publication Release Date: January 1997
- 1 -
Revision A3
GENERAL DESCRIPTION
The W27E257 is a high-speed, low-power Electrically Erasable and Programmable Read Only
Memory organized as 32768
× 8 bits that operates on a single 5 volt power supply. The W27E257
provides an electrical chip erase function. This part was the same EPROM Writer's utilities as the
W27E256.
FEATURES
High speed access time:
100/120/150 nS (max.)
Read operating current: 15 mA (typ.)
Erase/Programming operating current
1 mA (typ.)
Standby current: 5
µA (typ.)
Single 5V power supply
+14V erase/+12V programming voltage
Fully static operation
All inputs and outputs directly TTL/CMOS
compatible
Three-state outputs
Available packages: 28-pin 600 mil DIP and
32-pin PLCC
PIN CONFIGURATIONS
A6
A5
A4
A3
A2
A1
A0
NC
Q0
5
6
7
8
9
10
11
12
13
1
4
4
3
2
1
3
2
3
1
3
0 29
28
27
26
25
24
23
22
21
32-pin
PLCC
Q
1
Q
2
N
C
Q
3
Q
4
Q
5
G
N
D
26
27
28
1
2
3
4
5
6
7
8
21
22
23
24
25
16
17
18
19
20
9
10
11
12
13
14
15
Q3
CE
Q7
Q6
Q5
Q4
A9
A11
OE
A10
A14
A13
A8
1
5
1
6
1
7
1
8
1
9
2
0
GND
Q2
Q1
A0
A1
A2
A3
A4
A5
A6
A7
A12
V
Q0
PP
V
CC
A
7
N
C
A
1
2
V
P
P
A
1
4
A
1
3
V
C
C
A8
A9
A11
NC
OE
A10
Q7
CE
Q6
28-pin
DIP
BLOCK DIAGRAM
CE
OE
CONTROL
OUTPUT
BUFFER
DECODER
CORE
ARRAY
Q0
Q7
.
.
A0
.
.
A14
V
GND
CC
VPP
PIN DESCRIPTION
SYMBOL
DESCRIPTION
A0
−A14
Address Inputs
Q0
−Q7
Data Inputs/Outputs
CE
Chip Enable
OE
Output Enable
VPP
Program/Erase Supply Voltage
VCC
Power Supply
GND
Ground
NC
No Connection


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