M27C322 datasheet(7/13 Pages) STMICROELECTRONICS

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M27C322

Table 10. MARGIN MODE AC Characteristics (1)

(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12V ± 0.25V)

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

Table 11. Programming Mode AC Characteristics (1)

(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12V ± 0.25V)

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 Condition

Min

Max

Unit

tA9HVPH

tAS9

VA9 High to VPP High

µs

tVPHEL

tVPS

VPP High to Chip Enable Low

2µs

tA10HEH

tAS10

VA10 High to Chip Enable High (Set)

1µs

tA10LEH

tAS10

VA10 Low to Chip Enable High (Reset)

1µs

tEXA10X

tAH10

Chip Enable Transition to VA10 Transition

1µs

tEXVPX

tVPH

Chip Enable Transition to VPP Transition

2µs

tVPXA9X

tAH9

VPP Transition to VA9 Transition

2µs

Symbol

Alt

Parameter

Test Condition

Min

Max

Unit

tAVEL

tAS

Address Valid to Chip Enable Low

µs

tQVEL

tDS

Input Valid to Chip Enable Low

µs

tVCHEL

tVCS

VCC High to Chip Enable Low

2µs

tVPHEL

tOES

VPP High to Chip Enable Low

1µs

tVPLVPH

tPRT

VPP Rise Time

tELEH

tPW

Chip Enable Program Pulse Width (Initial)

µs

tEHQX

tDH

Chip Enable High to Input Transition

µs

tEHVPX

tOEH

Chip Enable High to VPP Transition

2µs

tVPLEL

tVR

VPP Low to Chip Enable Low

1µs

tELQV

tDV

Chip Enable Low to Output Valid

µs

tEHQZ

(2)

tDFP

Chip Enable High to Output Hi-Z

130

tEHAX

tAH

Chip Enable High to Address Transition

Programming

When delivered (and after each erasure for UV

EPROM), all bits of the M27C322 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 ultravi-

olet light (UV EPROM). The M27C322 is in the

programming mode when VPP input is at 12.V,

GVPP is at VIH and E is pulsed to VIL. The data to

be programmed is applied to 16 bits in parallel to

the data output pins. The levels required for the

address and data inputs are TTL. VCC is specified

to be 6.25V ± 0.25V.

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