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M27V402

4 Mbit (256Kb x16) Low Voltage UV EPROM and OTP EPROM

STMicroelectronics 

M27V402

Table 9. Programming Mode DC Characteristics (1)

(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V)

Symbol

Parameter

Test Condition

Min

Max

Unit

ILI

Input Leakage Current

0 ≤ VIN ≤ VCC

±10

µA

ICC

Supply Current

50

mA

IPP

Program Current

E = VIL

50

mA

VIL

Input Low Voltage

–0.3

0.8

V

VIH

Input High Voltage

2

VCC + 0.5

V

VOL

Output Low Voltage

IOL = 2.1mA

0.4

V

VOH Output High Voltage TTL

IOH = –400µA

2.4

V

VID

A9 Voltage

11.5

12.5

V

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

Table 10. Programming Mode AC Characteristics (1)

) (TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V)

t(s Symbol

Alt

Parameter

Test Condition Min

uc tAVEL

tAS

Address Valid to Chip Enable Low

2

rod tQVEL

tDS

Input Valid to Chip Enable Low

2

P tVPHEL

tVPS VPP High to Chip Enable Low

2

te tVCHEL

tVCS VCC High to Chip Enable Low

2

le tELEH

tPW

Chip Enable Program Pulse Width

95

so tEHQX

tDH

Chip Enable High to Input Transition

2

b tQXGL

tOES Input Transition to Output Enable Low

2

- O tGLQV

tOE

Output Enable Low to Output Valid

t(s) tGHQZ

tDFP Output Enable High to Output Hi-Z

0

uc tGHAX

tAH

Output Enable High to Address

Transition

0

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

ro 2. Sampled only, not 100% tested.

Max Unit

µs

µs

µs

µs

105

µs

µs

µs

100

ns

130

ns

ns

te P Programming

le When delivered (and after each erasure for UV

EPROM), all bits of the M27V402 are in the ’1’

so state. Data is introduced by selectively program-

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

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

Obe present in the data word. The only way to

light (UV EPROM). The M27V402 is in the pro-

gramming mode when VPP input is at 12.75V, G ia

at VIH and E is pulsed to VIL. The data to be pro-

grammed 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.

change a ’0’ to a ’1’ is by die exposure to ultraviolet

7/15

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