UVEPROM
AS27C256
Austin Semiconductor, Inc.
256K UVEPROM
PIN ASSIGNMENT
UV Erasable Programmable
(Top View)
Read-Only Memory
28-Pin DIP (J)
(600 MIL)
AVAILABLE AS MILITARY
SPECIFICATIONS
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
Vcc
A14
A13
A8
A9
A11
G\
28
27
26
25
24
23
22
21
• -55C to 125C operation
• MILITARYProcessing Method MIL-PRF-38535, Class Q
• Commercial VersionAvailable
A10
9
FEATURES
• Organized 32,768 x 8
• Single +5V ±10% power supply
• Pin-compatible with existing 256K ROM’s and EPROM’s
• All inputs/outputs fully TTL compatible
• Power-saving CMOS technology
• Very high-speed FLASHRITE Pulse Programming
• 3-state output buffers
20 E\
10
11
12
13
14
DQ7
19
18 DQ6
17 DQ5
16 DQ4
15
DQ3
32-Pin LCC (ECA)
(450 x 550 mils)
• 400-mV DC assured noise immunity with standard TTL
loads
4
3 2 1 32 31 30
• Latchup immunity of 250 mA on all input and output pins
• Low power dissipation (CMOS Input Levels)
-Active - 165mW Worst Case
-Standby - 1.7mW Worst Case (CMOS-input levels)
* FUTURE High Speed Offerings: 55ns, 70ns, 90ns
A6
5
6
7
8
9
10
11
12
13
A7
A5
WE\
A8
A9
A13
29
28
27 A11
A8
26
25
24
23
22
21
A6
A4
A5
A3
A4
NC
A9
G\
A11
A3
A2
A2
A1
\
A
E\
O
10
E
A1
A0
A10
A0
NC
CE1\
DQ7
DQ1
DQ0
DQ8
DQ6
OPTIONS
• Timing
MARKING
14 15 16 17 18 19 20
120ns access
150ns access
170ns access
200ns access
250ns access
300ns access
55ns access
70ns access
90ns access
-12
-15
-17
-20
-25
-30
-55
-70
-90
Pin Name
Function
A0 - A14 Address Inputs
DQ0-DQ7 Inputs (programming)/Outputs
E\
G\
Chip Enable/Power Down
Output Enable
Ground
GND
V
5V Supply
CC
• Package(s)
Ceramic DIP (600mils)
V
13V Programming Power Supply
PP
J
No. 110
Ceramic LCC (450 x 550 mils) ECA No. 208
• Processing / Operating Temperature Ranges
Full Military (-55oC to +125oC)
Industrial (-40°C to +85°C)
M
I
For more products and information
please visit our web site at
MilitaryTemp (-55oC to +125oC) XT
www.austinsemiconductor.com
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
AS27C256
Rev. 2.0 7/06
1