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Silicon Gate MOS
8708/8704
8192/4096
BIT ERASABLE AND ELECTRICALLY
REPROGRAMMABLE READ ONLY MEMORY
•
8708
1024x8 Organization
•
8704
512x8 Organization
• Fast Programming -
Typ.
100
sec. For All 8K Bits
• Low Power During Programming
• Access Time-
450
ns
• Standard Power
Supplies-
+12V, ±5V
• Static- No Clocks Required
• Inputs and Outputs TTL
Compatible During Both Read
and Program Modes
• Three-State
Output-
OR-Tie
Capability
The
Intel@8708/8704 are high
speed
8192/4096
bit
erasable
and
electrically
reprogrammable
ROM's
(EPROM) ideally suited
where
fast
turn
around
and
pattern
experimentation
are
important
requirements.
The
8708/8704
are packaged in a
24
pin dual-in-line package
with
transparent
lid.
The
transparent
lid allows
the
user
to
ex-
pose
the
chip
to
ultraviolet light
to
erase
the
bit
pattern.
A
new
pattern
can
then
be
written
into
the
devices.
@
A pin
for
pin mask
programmed
ROM,
the
Intel
8308,
is
available
for
large
volume
production
runs
of
systems
initially using
the
8708.
The
8708/8704
is
fabricated
with
the
time
proven N-channel silicon gate
technology.
PIN CONFIGURATIONS BLOCK
DIAGRAM
Y
GATING
OUTPUT BUFFERS
64 X 128
ROM
ARRAY
DATA
OUTPUT
0,
Os
I
X
DECODER
Y
DECODER
CHIP SELECT
LOGIC
CS/WE-
AO·A
g
ADDRESS
INPUTS
A7
24
Vee
A6
2
23
As
As
3
22
A4
4
21
Vea
A3
5
20
CSIWE
87081
A2
6
8704
19
Voo
A1
7
18
PROGRAM
Ao
8
17
Os
01
9
16
07
02
10
15
06
03
11
14
Os
Vss
12
13
04
*8704
=V
ss
8708 =A
g
PIN NAMES
Ao·Ag ADDRESS INPUTS
O,·Os
DATA
OUTPUTS
CSIWE CHIP
SElECTIWRITE
ENABLE INPUT
5-45