6.42

4

IDT70P256/246L

Preliminary

Low Power 1.8V 8K/4K x 16 Dual-Port Static RAM

Industrial Temperature Range

Truth Table II: Semaphore Read/Write Control(1)

NOTE:

1. There are eight semaphore flags written to via I/O0 and read from all of the I/O's (I/O0-I/O15). These eight semaphores are addressed by A0-A2.

Inputs

Outputs

Mode

CE

R/

W

OE

UB

LB

SEM

I/O8-15

I/O0-7

HH

L

X

X

L

DATAOUT

DATAOUT

Read Data in Semaphore Flag

XH

L

H

H

L

DATAOUT

DATAOUT

Read Data in Semaphore Flag

H

↑

XX

X

L

DATAIN

DATAIN

Write DIN0 into Semaphore Flag

X

↑

XH

H

L

DATAIN

DATAIN

Write DIN0 into Semaphore Flag

L

X

XL

XL

____

____

Not Allowed

LX

X

X

L

L

____

____

Not Allowed

5699 tbl 03

Absolute Maximum Ratings(1)

NOTES:

1. Stresses greater than 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 may affect

reliability.

2. VTERM must not exceed VDD + 0.3V for more than 25% of the cycle time or 10ns maximum, and

is limited to < 20mA for the period over VTERM = VDD + 0.3V.

3. Ambient Temperature under DC Bias. No AC Conditions. Chip Deselected.

Symbol

Rating

Commercial

& Industrial

Unit

VTERM

Supply Voltage on VDD

with Respect to GND

-0.5 to +2.9

V

VTERM

Supply Voltage on VDDQL

with Respect to GND

-0.5 to +3.6

V

VTERM(2)

Terminal Voltage with

Respect to GND

-0.5 to VDD +0.3

V

TBIAS(3)

Temperature Under Bias

-55 to +125

oC

TSTG

Storage Temperature

-65 to +150

oC

TJN

Junction Temperature

+150

oC

IOUT (for

VDDQx = 3.0V)

DC Output Current

20

mA

5699 tbl 04