TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES

SMLS256H- SEPTEMBER 1984 - REVISED NOVEMBER 1997

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features

Organization...32768 by 8 Bits
Single 5-V Power Supply
Pin Compatible With Existing 256K MOS ROMs, PROMs, and EPROMs
All Inputs/Outputs Fully TTL Compatible
Max Access/Min Cycle Time
V_CC ± 10%
'27C/PC256-10 100 ns
'27C/PC256-12 120 ns
'27C/PC256-15 150 ns
'27C/PC256-17 170 ns
'27C/PC256-20 200 ns
'27C/PC256-25 250 ns
Power Saving CMOS Technology
Very High-Speed SNAP! Pulse Programming
3-State Output Buffers
400-mV Minimum DC Noise Immunity With Standard TTL Loads
Latchup Immunity of 250 mA on All Input and Output Lines
Low Power Dissipation (V_CC = 5.5 V)
- Active...165 mW Worst Case
- Standby...1.4 mW Worst Case (CMOS Input Levels)
Temperature Range Options
256K EPROM Available With MIL-STD-883C Class B High Reliability Processing (SMJ27C256)

description

The TMS27C256 series are 32768 by 8-bit (262144-bit), ultraviolet (UV) light erasable, electrically programmable read-only memories (EPROMs).

The TMS27PC256 series are 32768 by 8-bit (262144-bit), one-time programmmable (OTP) electrically programmable read-only memories (PROMs).

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.

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 V_PP of 13 V and a V_CC 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.

Title: 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES
Product Family: EPROM
Device Functionality: EPROM-256K(32KX8)
Orderable Devices: TMS27C256-10JL, TMS27C256-120JL, TMS27C256-12JL, TMS27C256-150JE, TMS27C256-150JL, TMS27C256-15JE, TMS27C256-15JL, TMS27C256-17JL, TMS27C256-1JE, TMS27C256-1JL, TMS27C256-20JE, TMS27C256-20JL, TMS27C256-25JE, TMS27C256-25JL, TMS27C256-2JE, TMS27C256-2JE4, TMS27C256-2JL, TMS27C256JE, TMS27C256JL, TMS27PC256-10FML, TMS27PC256-12FME, TMS27PC256-12FML, TMS27PC256-12NL, TMS27PC256-150NL, TMS27PC256-15FME, TMS27PC256-15FML, TMS27PC256-15NL, TMS27PC256-20FML, TMS27PC256-20NL, TMS27PC256-2FME, TMS27PC256-2FML, TMS27PC256-2NL, TMS27PC256FML

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View more information about generic part numbers:TMS27C256, TMS27PC256

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