M27C2001-10B1 Ver la hoja de datos (PDF) - STMicroelectronics

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M27C2001-10B1

2 Mbit (256Kb x 8) UV EPROM and OTP EPROM

STMicroelectronics 

M27C2001

Table 8B. Read Mode AC Characteristics (1)

(TA = 0 to 70 °C or –40 to 85 °C; VCC = 5V ± 5% or 5V ± 10%; VPP = VCC)

M27V2001

Symbol Alt

Parameter

Test Condition

-10

-12

Min Max Min Max

tAVQV

tACC

Address Valid to Output

Valid

E = VIL, G = VIL

100

120

tELQV

tCE

Chip Enable Low to

Output Valid

G = VIL

100

120

tGLQV

tOE

Output Enable Low to

Output Valid

E = VIL

50

50

tEHQZ (2)

tDF

Chip Enable High to

Output Hi-Z

G = VIL

0 30 0 40

tGHQZ (2)

tDF

Output Enable High to

Output Hi-Z

E = VIL

0 30 0 40

tAXQX

tOH

Address Transition to

Output Transition

E = VIL, G = VIL 0

0

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

2. Sampled only, not 100% tested.

-15/-20/-25

Min Max

150

150

60

0 50

0 50

0

Unit

ns

ns

ns

ns

ns

ns

Figure 5. Read Mode AC Waveforms

A0-A17

E

G

Q0-Q7

VALID

tAVQV

tGLQV

tELQV

tAXQX

VALID

tEHQZ

tGHQZ

Hi-Z

AI00719B

Programming

When delivered (and after each erasure for UV

EPROM), all bits of the M27C2001 are in the ’1’

state. Data is introduced by selectively program-

ming ’0’s into the desired bit locations. Although

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 ultravio-

let light (UV EPROM). The M27C2001 is in the

programming mode when VPP input is at 12.75V,

E is 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.

6/16

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