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27LV256

256K (32K x 8) Low-Voltage CMOS EPROM

Microchip Technology 

27LV256

TABLE 1-4: PROGRAMMING DC CHARACTERISTICS

Ambient Temperature: Tamb = 25°C ± 5°C

VCC = 6.5V ± 0.25V, VPP = 13.0V ± 0.25V

Parameter

Status Symbol Min Max. Units

Conditions

Input Voltages

Logic”1”

VIH

Logic”0”

VIL

2.0 VCC+1 V

-0.1 0.8

V

Input Leakage

—

ILI

-10 10

µA VIN = 0V to VCC

Output Voltages

Logic”1” VOH

Logic”0” VOL

2.4

0.45

V IOH = -400 µA

V IOL = 2.1 mA

VCC Current, program & verify —

ICC2

—

20

mA Note 1

VPP Current, program

—

IPP2

—

25

mA Note 1

A9 Product Identification

—

VH

11.5 12.5

V

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

TABLE 1-5: PROGRAMMING AC CHARACTERISTICS

for Program, Program Verify

and Program Inhibit Modes

AC Testing Waveform: VIH=2.4V and VIL=0.45V; VOH=2.0V; VOL=0.8V

Output Load:

1 TLL Load + 100pF

Ambient Temperature: Tamb=25°C±5°C

VCC= 6.5V ± 0.25V, VPP =13.0V ± 0.25V

Parameter

Symbol Min. Max. Units

Remarks

Address Set-Up Time

tAS

2

—

µs

Data Set-Up Time

tDS

2

—

µs

Data Hold Time

tDH

2

—

µs

Address Hold Time

tAH

0

—

µs

Float Delay (2)

tDF

0 130 ns

VCC Set-Up Time

tVCS

2

—

µs

Program Pulse Width (1)

tPW

95 105 µs 100 µs typical

CE Set-Up Time

tCES

2

—

µs

OE Set-Up Time

tOES

2

—

µs

VPP Set-Up Time

tVPS

2

—

µs

Data Valid from OE

tOE

— 100 ns

Note 1: For express algorithm, initial programming width tolerance is 100 µs ±5%.

2: This parameter is only sampled and not 100% tested. Output float is defined as the point where data is no

longer driven (see timing diagram).

DS11020F-page 4

© 1996 Microchip Technology Inc.

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