M27C516 datasheet(6/12 Pages) STMICROELECTRONICS

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Programming

When delivered, all bits of the M27C516 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 M27C516 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 16 bits in parallel to the

data output pins. The evels required for the ad-

dress and data inputs are TTL. VCC is specified to

be 6.25V

±0.25V.

AI00935B

tAXQX

tEHQZ

A0-A14

Q0-Q15

tAVQV

tGHQZ

tGLQV

tELQV

VALID

Hi-Z

VALID

Figure 5. Read Mode AC Waveforms

Symbol

Alt

Parameter

Test Condition

M27C516

Unit

-70

(3)

-85/-10

Min

Max

Min

Max

tAVQV

tACC

Address Valid to Output Valid

E = VIL,G = VIL

tELQV

tCE

Chip Enable Low to Output Valid

G = VIL

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

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

2. Sampled only, not 100% tested.

3. Speed obtained with a load capacitance of 60pF

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)

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