UVEPROM
Austin Semiconductor, Inc.
FUNCTIONAL BLOCK DIAGRAM*
EPROM 32,768 x 8
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
E\
G\
10
9
8
7
6
5
4
3
25
24
21
23
2
26
27
20
22
0
SMJ27C256
A
0
32,767
A
A
A
A
A
A
A
A
11
12
13
15
16
17
18
19
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
14
[PWR DWN]
&
EN
* This symbol is in accordance with ANSI/IEEE std 91-1984 and IEC Publication 617-12.
OPERATION
The seven modes of operation for the SMJ27C256 are listed in Table 1. The read mode requires a single 5V supply. All
inputs are TTL level except for V
PP
during programming (13V for SNAP! Pulse), and (12V) on A9 for signature mode.
TABLE 1. OPERATION MODES
FUNCTION
(PINS)
E\ (20)
G\ (22)
V
PP
(1)
V
CC
(28)
A9 (24)
A0 (10)
MODE*
READ
V
IL
V
IL
V
CC
V
CC
X
X
OUTPUT
PROGRAM
SIGNATURE MODE
STANDBY PROGRAMMING VERIFY
DISABLE
INHIBIT
V
IL
V
IL
V
IH
V
IL
V
IH
V
IH
V
IH
V
CC
V
CC
X
X
High-Z
X
V
CC
V
CC
X
X
High-Z
V
IH
V
PP
V
CC
X
X
Data In
V
IL
V
PP
V
CC
X
X
Data Out
X
V
PP
V
CC
X
X
High-Z
V
ID
V
IL
V
IL
V
CC
V
CC
V
ID
V
IH
DQ0-DQ7
Data Out
(11-13, 15-19)
* X can be V
IL
or V
IH
.
SMJ27C256
Rev. 1.0 9/01
CODE
MFG
DEVICE
97
04
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
2
AUSTIN [ AUSTIN SEMICONDUCTOR ]
