UVEPROM
SMJ27C256
Austin Semiconductor, Inc.
256K UVEPROM
PIN ASSIGNMENT
UV Erasable Programmable
(Top View)
Read-Only Memory
32-Pin DIP (J)
(600 MIL)
AVAILABLE AS MILITARY
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
20
SPECIFICATIONS
• SMD 5962-86063
• MIL-STD-883
A10
E\
9
FEATURES
• Organized 32,768 x 8
• Single +5V ±10% power supply
• Pin-compatible with existing 256K ROM’s and
EPROM’s
10
11
12
13
14
19 DQ7
18 DQ6
17 DQ5
16
15
DQ4
DQ3
• 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
Pin Name
A0 - A14 Address Inputs
DA0-DQ7 Inputs (programming)/Outputs
E\
G\
GND
Function
Chip Enable/Power Down
Output Enable
Ground
VCC
VPP
5V Supply
• Latchup immunity of 250 mA on all input and output
pins
13V Programming Power Supply
• Low power dissipation (CMOS Input Levels)
PActive - 165mW Worst Case
PStandby - 1.7mW Worst Case (CMOS-input levels)
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.
OPTIONS
• Timing
MARKING
150ns access
170ns access
200ns access
250ns access
300ns access
-15
-17
-20
-25
-30
• Package(s)
Ceramic DIP (600mils)
J
No. 110
• Operating Temperature Ranges
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.
Military (-55oC to +125oC)
M
For more products and information
please visit our web site at
The SNAP! Pulse programming algorithm uses a VPP of 13V
and a VCC 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.
www.austinsemiconductor.com
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
SMJ27C256
Rev. 1.0 9/01
1
AUSTIN [ AUSTIN SEMICONDUCTOR ]
