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TMS27PC256-15 Datasheet(PDF) 2 Page - Texas Instruments

Part # TMS27PC256-15
Description  8-BIT PROGRAMMABLE READ-ONLY MEMORIES
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TMS27PC256-15 Datasheet(HTML) 2 Page - Texas Instruments

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TMS27C256 32768 BY 8BIT UV ERASABLE
TMS27PC256 32768 BY 8BIT
PROGRAMMABLE READONLY MEMORIES
SMLS256H− SEPTEMBER 1984 − REVISED NOVEMBER 1997
2
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
description (continued)
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 74 TTL circuits
without the use of external pull-up resistors. Each output can drive one Series 74 TTL circuit without external
resistors.
The data outputs are 3-state for connecting multiple devices to a common bus. The TMS27C256 and the
TMS27PC256 are pin compatible with 28-pin 256K MOS ROMs, PROMs, and EPROMs.
The TMS27C256 EPROM is offered in a dual-in-line ceramic package (J suffix) designed for insertion in
mounting-hole rows on 15,2-mm (600-mil) centers. The TMS27PC256 OTP PROM is supplied in a 32-lead
plastic leaded chip-carrier package using 1,25-mm (50-mil) lead spacing (FM suffix).
The TMS27C256 and TMS27PC256 are offered with two choices of temperature ranges of 0
°C to 70°C (JL and
FML suffixes) and − 40
°C to 85°C (JE and FME suffixes). See Table 1.
All package styles conform to JEDEC standards.
Table 1. Temperature Range Suffixes
EPROM
AND
SUFFIX FOR OPERATING
FREE-AIR TEMPERATURE RANGES
AND
OTP PROM
0
°C TO 70°C
−40
°C TO 85°C
TMS27C512-xxx
JL
JE
TMS27PC512-xxx
FML
FME
These EPROMs and OTP PROMs operate from a single 5-V supply (in the read mode), thus are ideal for use
in microprocessor-based systems. One other 13-V supply is needed for programming . All programming signals
are TTL level. These devices are programmable by the SNAP! Pulse programming algorithm. The SNAP! Pulse
programming algorithm uses a VPP of 13 V and a VCC of 6.5 V 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.


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