M27V201 datasheet(6/15 Pages) STMICROELECTRONICS

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M27V201

6/15

Figure 5. Read Mode AC Waveforms

AI00719B

tAXQX

tEHQZ

A0-A17

Q0-Q7

tAVQV

tGHQZ

tGLQV

tELQV

VALID

Hi-Z

VALID

Table 8B. Read Mode AC Characteristics (1)

(TA = 0 to 70°C or –40 to 85 °C; VCC = 3.3V ± 10%; VPP = Vcc)

Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.

2. Sampled only, not 100% tested.

Symbol

Alt

Parameter

Test Conditi on

M27V201

Unit

-180

-200

Min

Max

Min

Max

tAVQV

tACC

Address Valid to Output Valid

E= VIL,G= VIL

180

200

tELQV

tCE

Chip Enable Low to Output Valid

G= VIL

180

200

tGLQV

tOE

Output Enable Low to Output Valid

E = VIL

tEHQZ

(2)

tDF

Chip Enable High to Output Hi-Z

G= VIL

tGHQZ

(2)

tDF

Output Enable High to Output Hi-Z

E= VIL

tAXQX

tOH

Address Transition to Output

Transition

E= VIL,G= VIL

Programming

The M27V201 has been designed to be fully com-

patible with the M27C2001 and has the same elec-

tronic signature. As a result the M27V201 can be

programmed as the M27C2001 on the same pro-

gramming equipments by applying 12.75V on VPP

and 6.25V on VCC by the use of the same PRES-

TO II algorithm. When delivered (and after each

erasure for UV EPROM), all bits of the M27V201

are in the ’1’ state.Data is introduced by selectively

programming ’0’s into the desired bit locations. Al-

though only ’0’s will be programmed, both ’1’s and

’0’s can be present in the data word. The only way

to change a ’0’ to a ’1’ is by die exposition to ultra-

violet light (UV EPROM). The M27V201 is in the

programming mode when VPP input is at 12.75V,

Eis at VIL and P is pulsed to VIL. The data to be

programmed is applied to 8 bits in parallel to the

data output pins. The levels required for the ad-

dress and data inputs are TTL. VCC is specified to

be 6.25V

±0.25V.

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