Preliminary
Features
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HT27C040
OTP CMOS 512K´8-Bit EPROM
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Operating voltage: +5.0V
Programming voltage
–
V
PP
=12.5V±0.2V
–
V
CC
=6.0V±0.2V
High-reliability CMOS technology
Latch-up immunity to 100mA from -1.0V to
V
CC
+1.0V
CMOS and TTL compatible I/O
Low power consumption
–
Active: 30mA max.
–
Standby: 1mA typ.
512K´8-bit organization
Fast read access time: -70ns, -90ns
and -120ns
Fast programming algorithm
Programming time 75ms typ.
Two line controls (OE and CE)
Standard product identification code
Commercial temperature range
(0°C to +70°C)
32-pin DIP package
General Description
The HT27C040 chip family is a low-power,
4096K (4,194,304) bit, +5V electrically
one-time programmable (OTP) read-only mem-
ories (EPROM). Organized into 512K words
with 8 bits per word, it features a fast single ad-
dress location programming, typically at 75ms
per byte. Any byte can be accessed in less than
70ns/90ns/120ns with respect to Spec. This
eliminates the need for WAIT states in
high-performance microprocessor systems. The
HT27C040 has separate Output Enable (OE)
and Chip Enable (CE) controls which eliminate
bus contention issues.
Block Diagram
R o w
A d d re s s
C o lu m n
A d d re s s
X -D e c o d e r
C e ll A r r a y
V C C
Y -D e c o d e r
Y - G a tin g
V S S
V P P
C E
O E
C E & O E &
T E S T
C o n tr o l L o g ic
S A C K T
&
O u tp u t B u ffe r
D Q 0 ~ D Q 7
1
August 29, 2000
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
