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WS27C256L

WS27C256L MILITARY 32K X 8 CMOS EPROM

STMicroelectronics 

WS27C256L

ABSOLUTE MAXIMUM RATINGS*

Storage Temperature............................–65° to + 150°C

Voltage on any Pin with

Respect to Ground ....................................–0.6V to +7V

VPP with Respect to Ground...................–0.6V to + 14V

VCC Supply Voltage with

Respect to Ground ....................................–0.6V to +7V

ESD Protection ..................................................>2000V

OPERATING RANGE

RANGE

TEMPERATURE

Military

–55°C to +125°C

VCC

+5V ± 10%

*NOTICE:

Stresses above those listed under "Absolute Maximum

Ratings" may cause permanent damage to the device.

This is a stress rating only and functional operation of

the device at these or any other conditions above

those indicated in the operational sections of this

specification is not implied. Exposure to absolute

maximum rating conditions for extended periods of

time may affect device reliability.

DC READ CHARACTERISTICS Over Operating Range. (See Above)

SYMBOL

PARAMETER

TEST CONDITIONS

MIN

MAX

VIL

Input Low Voltage

VIH

Input High Voltage

VOL

Output Low Voltage

VOH

Output High Voltage

IOL = 2.1 mA

IOH = –400 µA

–0.5

2.0

3.5

0.8

VCC + 1

0.4

ISB1

VCC Standby Current (CMOS) CE = VCC ± 0.3 V (Note 2)

100

ISB2

VCC Standby Current

CE = VIH

1

ICC

VCC Active Current

CE = OE = VIL

(Note 1)

F = 5 MHz

F = 8 MHz

40

50

IPP

VPP Supply Current

VPP

VPP Read Voltage

ILI

Input Leakage Current

VPP = VCC

VIN = 5.5 V or Gnd

100

VCC –0.4

VCC

–10

10

ILO

Output Leakage Current

VOUT = 5.5 V or Gnd

–10

10

NOTES: 1. The supply current is the sum of ICC and IPP. The maximum current value is with Outputs O0 to O7 unloaded.

2. CMOS inputs: VIL = GND ± 0.3V, VIH = VCC ± 0.3 V.

UNITS

V

V

V

V

µA

mA

mA

mA

µA

V

µA

µA

AC READ CHARACTERISTICS Over Operating Range (See Above)

SYMBOL

PARAMETER

WS27C256L-12 WS27C256L-15 WS27C256L-20

UNITS

MIN

MAX

MIN

MAX

MIN

MAX

t ACC

t CE

tOE

t DF

Address to Output Delay

CE to Output Delay

OE to Output Delay

Output Disable to Output Float

(Note 3)

120

150

200

120

150

200

35

40

40

ns

35

40

40

Output Hold From Addresses,

t OH

CE or OE, Whichever Occurred

0

0

0

First (Note 3)

NOTE: 3. This parameter is only sampled and is not 100% tested. Output Float is defined as the point where data is no longer driven – see timing

diagram.

4-20

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