DS2227 Maxim, DS2227 Datasheet - Page 9

• Manufacturer Part Number: DS2227
• Description: The DS2227 combines voltage monitoring circuitry with lithium-backed memory in a flexible architecture that can be accessed as 128k x 32, 256k x 16, or 512k x 8 bits
• Manufacturer: Maxim

NOTES:
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DC TEST CONDITIONS
Outputs Open
Cycle = 200 ns
All Voltages are Referenced to Ground
AC TEST CONDITIONS
Output Load: 100 pF + 1TTL gate
Input Pulse Levels: 0 - 3.0 V
Timing Measurements Reference Levels:
Input Pulse Rise and Fall Times: 5 ns
ORDERING INFORMATION
state.
t
t
t
If the
output buffers remain in a high impedance state in this period.
If the
buffers remain in a high impedance state in this period.
If the
transition, the output buffers remain in a high impedance state in this period.
Each DS2227 is marked with a 4-digit date code AABB. AA designates the year of manufacture.
BB designates the week of manufacture. The minimum expected t
date of manufacture.
Timings are valid only when
OE
WE
WP
DH
DH
Input - 1.5V
Output - 1.5V
, t
is measured from
is specified as the logical AND of
= V
is high for a read cycle.
DS
CE
WE
CE
are measured from the earlier of
IH
high transition occurs prior to or simultaneously with the
or V
low transition occurs simultaneously with or later than the
is low or the
IL
. If
OE
WE
= V
WE
going high. If
IH
CE
low transition occurs prior to or simultaneously with the
during write cycle, the output buffers remain in a high impedance
is tied low.
CE
CE
CE
9 of 10
and
or
is used to terminate the write cycle then t
WE
WE
.
going high.
DR
WE
is defined as starting at the
high transition, the output
WE
low transition, the
DH
= 20 ns.
CE
DS2227
low