UV Erasable Programmable Read-Only Memory
The SMJ27C256 series is a set of 262,144 bit, ultravioletlight
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
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.
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.
• Organized 32,768 x 8
• Single +5V ±10% power supply
• Pin-compatible with existing 256K ROM’s and EPROM’s
• 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
• Latchup immunity of 250 mA on all input and output pins
• Low power dissipation (CMOS Input Levels)
3Active - 165mW Worst Case
3Standby - 1.7mW Worst Case (CMOS-input levels)
Austin Semiconductor, Inc.
new and original stock
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