UVEPROM
Austin Semiconductor, Inc.
256K UVEPROM
UV Erasable Programmable
Read-Only Memory
AVAILABLE AS MILITARY
SPECIFICATIONS
• SMD 5962-86063
• MIL-STD-883
SMJ27C256
PIN ASSIGNMENT
(Top View)
32-Pin DIP (J)
(600 MIL)
V
PP
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
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
Vcc
A14
A13
A8
A9
A11
G\
A10
E\
DQ7
DQ6
DQ5
DQ4
DQ3
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 SNAP! Pulse Programming
• 3-state output buffers
• 400-mV DC assured noise immunity with standarad
TTL loads
• Latchup immunity of 250 mA on all input and output
pins
• Low power dissipation (CMOS Input Levels)
PActive
- 165mW Worst Case
PStandby
- 1.7mW Worst Case (CMOS-input levels)
Pin Name
A0 - A14
DA0-DQ7
E\
G\
GND
V
CC
V
PP
Function
Address Inputs
Inputs (programming)/Outputs
Chip Enable/Power Down
Output Enable
Ground
5V Supply
13V Programming Power Supply
GENERAL DESCRIPTION
The SMJ27C256 series is a set of 262,144 bit, ultraviolet-
light erasable, electrically programmable read-only
memories. These devices are fabricated using power-saving
CMOS technology for high speed and simple interface with
MOS and bipolar circuits. All inputs (including program data
inputs) can be driven by Series 54 TTL circuits without the
use of external pullup resistors. Each output can drive one
Series 54 TTL circuit without external resistors. The data
outputs are 3-state for connecting multiple devices to a
common bus. The SMJ27C256 is pin-compatible with
28-pin 256K ROMs and EPROMs. It is offered in a 600mil
dual-in-line ceramic pagackage (J suffix) rated for operation
from -55°C to 125°C.
Because this EPROM operates from a single 5V supply (in
the read mode), it is ideal for use in microprocessor-based
systems. One other supply (13V) is needed for programming.
All programming signals are TTL level. This device is
programmable by the SNAP! Pulse programming algorithm.
The SNAP! Pulse programming algorithm uses a V
PP
of 13V
and a V
CC
of 6.5V for a nominal programming time of four
seconds. For programming outside the system, existing
EPROM programmers can be used. Locations can be
programmed singly, in blocks, or at random.
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
OPTIONS
• Timing
150ns access
170ns access
200ns access
250ns access
300ns access
• Package(s)
Ceramic DIP (600mils)
MARKING
-15
-17
-20
-25
-30
J
No. 110
• Operating Temperature Ranges
Military (-55
o
C to +125
o
C)
M
For more products and information
please visit our web site at
www.austinsemiconductor.com
SMJ27C256
Rev. 1.0 9/01
1
ASI [ ADVANCED SEMICONDUCTOR ]
