at60142et-dd20sms ATMEL Corporation, at60142et-dd20sms Datasheet - Page 7

• Manufacturer Part Number: at60142et-dd20sms
• Description: Rad Hard 512k X 8 Very Low Power Cmos Sram
• Manufacturer: ATMEL Corporation

AC Characteristics
Figure 1. AC Test Loads Waveforms
Data Retention Mode
7
AT60142E/ET
Temperature Range:................................................ -55 +125°C
Supply Voltage:........................................................ 3.3 +0.3V
Input Pulse Levels: .................................................. GND to 3.0V
Input Rise and Fall Times:....................................... 3ns (10 - 90%)
Input and Output Timing Reference Levels: ............ 1.5V
VRef Capacitor: ....................................................... 10 µF
Output Loading I
Atmel CMOS RAM's are designed with battery backup in mind. Data retention voltage
and supply current are guaranteed over temperature. The following rules insure data
retention:
1. During data retention chip select CS must be held high within
2. Output Enable (OE) should be held high to keep the RAM outputs high imped-
3. During power-up and power-down transitions CS and OE must be kept between
4. The RAM can begin operation > t
Figure 2. Data Retention Timing
ance, minimizing power dissipation.
V
voltages (3V).
CC
+ 0.3V and 70% of
OL
/I
OH
:............................................ See Figure 1
V
CC
.
R
ns after
V
CC
reaches the minimum operation
V
CC
to
V
4156F–AERO–06/04
CC
-0.2V.