AMD27C64 Datasheet, PDF (1/11 Pages) Advanced Micro Devices – 64 Kilobit (8,192 x 8-Bit) CMOS EPROM

FINAL
Am27C64
64 Kilobit (8,192 x 8-Bit) CMOS EPROM
Advanced
Micro
Devices
DISTINCTIVE CHARACTERISTICS
s Fast access time
— 45 ns
s Low power consumption
— 20 µA typical CMOS standby current
s JEDEC-approved pinout
s Single +5 V power supply
s ±10% power supply tolerance available
s 100% Flashrite^TM programming
— Typical programming time of 1 second
GENERAL DESCRIPTION
The Am27C64 is a 64-Kbit ultraviolet erasable program-
mable read-only memory. It is organized as 8K words by
8 bits per word, operates from a single +5 V supply, has
a static standby mode, and features fast single address
location programming. Products are available in win-
dowed ceramic DIP packages as well as plastic one
time programmable (OTP) PDIP, and PLCC packages.
Typically, any byte can be accessed in less than 45 ns,
allowing operation with high-performance microproces-
sors without any WAIT states. The Am27C64 offers
separate Output Enable (OE) and Chip Enable (CE)
BLOCK DIAGRAM
OE
CE
PGM
VCC
VSS
VPP
Output Enable
Chip Enable
and
Prog Logic
s Latch-up protected to 100 mA from –1 V to
VCC + 1 V
s High noise immunity
s Versatile features for simple interfacing
— Both CMOS and TTL input/output
compatibility
— Two line control functions
s Standard 28-pin DIP, PDIP, and 32-pin PLCC
packages
controls, thus eliminating bus contention in a multiple
bus microprocessor system.
AMD’s CMOS process technology provides high speed,
low power, and high noise immunity. Typical power con-
sumption is only 80 mW in active mode, and 100 µW in
standby mode.
All signals are TTL levels, including programming sig-
nals. Bit locations may be programmed singly, in blocks,
or at random. The Am27C64 supports AMD’s Flashrite
programming algorithm (100 µs pulses) resulting in a
typical programming time of 1 second.
Data Outputs
DQ0–DQ7
Output
Buffers
Y
Decoder
Y
Gating
A0–A12
Address
Inputs
X
Decoder
65,538
Bit Cell
Matrix
11419D-1
2-10
Publication# 11419 Rev. D Amendment /0
Issue Date: May 1995