TMS27C020 262144 BY 8-BIT UV ERASABLE

TMS27PC020 262144 BY 8-BIT

PROGRAMMABLE READ-ONLY MEMORIES

SMLS020C – NOVEMBER 1990 – REVISED SEPTEMBER 1997

2

POST OFFICE BOX 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 pullup resistors. Each output can drive one Series 74 TTL circuit without external

resistors.

The TMS27C020 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 TMS27C020 is also offered with two choices of

temperature ranges of 0

° to 70°C (JL suffix) and – 40°C to 85°C (JE suffix). See Table 1.

The TMS27PC020 is offered in a 32-lead plastic leaded chip carrier using 1,25 mm (50 mil) lead spacing

( FM suffix). The TMS27PC020 is offered with two choices of temperature ranges of 0

°C to 70°C (FML suffix)

and – 40

°C to 85°C (FME suffix). See Table 1.

Table 1. Temperature Range Suffixes

FUNCTION

SUFFIX FOR OPERATING

TEMPERATURE RANGES

0

°C TO 70°C

– 40

°C TO 85°C

TMS27C040-XXX

JL

JE

TMS27PC040-XXX

FML

FME

These EPROMs operate from a single 5-V supply ( in the read mode), they are ideal for use in

microprocessor-based systems. One other (13 V) supply is needed for programming. All programming signals

are TTL level. For programming outside the system, existing EPROM programmers can be used.

operation

The seven modes of operation for the TMS27C020 and TMS27PC020 are listed in Table 2. The read mode

A9 for the signature mode.

Table 2. Operation Modes

MODE†

FUNCTION

READ

OUTPUT

DISABLE

STANDBY

PROGRAMMING

VERIFY

PROGRAM

INHIBIT

SIGNATURE MODE

E

VIL

VIL

VIH

VIL

VIL

VIH

VIL

G

VIL

VIH

X

VIH

VIL

X

VIL

PGM

X

X

X

VIL

VIH

X

X

VPP

X

VCC

VCC

VPP

VPP

VPP

VCC

VCC

VCC

VCC

VCC

VCC

VCC

VCC

VCC

A9

X

X

X

X

X

X

VH‡

VH‡

A0

X

X

X

X

X

X

VIL

VIH

CODE

DQ0 – DQ7

Data Out

Hi-Z

Hi-Z

Data In

Data Out

Hi-Z

MFG

DEVICE

97

32

† X can be VIL or VIH

‡ VH = 12 V ± 0.5 V