DS1321 Maxim, DS1321 Datasheet - Page 11

• Manufacturer Part Number: DS1321
• Description: The DS1321 Flexible Nonvolatile Controller with Lithium Battery Monitor is a CMOS circuit which solves the application problem of converting CMOS SRAMs into nonvolatile memory
• Manufacturer: Maxim

NOTES:
1. All voltages referenced to ground.
2. Measured with outputs open circuited.
3. I
4. I
5. All inputs within 0.3V of ground or V
6. I
7. Measured with a load as shown in Figure 1.
8. Chip Enable Outputs
9.
10.
11. t
12. In battery backup mode, inputs must never be below ground or above V
13. The DS1321 is recognized by Underwriters Laboratory (U.L.
DC TEST CONDITIONS
Outputs Open
All voltages are referenced to ground
OUTPUT LOAD Figure 3
V
V
battery backup mode at V
should be connected to these pins for proper operation. Both
CEO1
BW
CE
CCO1
CCO2
CCO3
CCI
CCI
maximum must be met to ensure data integrity on power down.
-0.2V.
-0.3V.
and
is the maximum average load which the DS1321 can supply to attached memories at V
is the maximum average load which the DS1321 can supply to attached memories at V
is the maximum average load current which the DS1321 can supply to the memories in the
through
RST
CEO4
are open drain outputs and, as such, cannot source current. External pullup resistors
will be held high for a time equal to t
CEO1
CCO
-
CEO4
*INCLUDING SCOPE AND JIG CAPACITANCE
³ V
BAT
can only sustain leakage current in the battery backup mode.
-0.2V.
CCI
.
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AC TEST CONDITIONS
Output Load: See below
Input Pulse Levels: 0 - 3.0V
Timing Measurement Reference Levels
Input pulse Rise and Fall Times: 5 ns
Input: 1.5V
Output: 1.5V
REC
®
BW
after V
) under file E99151.
and
CCI
RST
CCO
crosses V
.
can sink 10 mA.
CCTP
on power-up.
CCO
CCO
³
³