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(V
C
, T
A
t
ARAMETE SYMBOL IN TYP MAX UNITS NOTES
POWER-UP/DOWN CHARACTERISTICS
C
= +5V 10% = -40°C o +85°C.) (Figure 8)
P R M
CE or WE at V
IH
,
Before Power-Down
t 0
s
PD
V e: V
PF(MAX)
to
MIN)
s
CC
Fall Tim V
PF(
t
F
300
V
CC
Fall Time: V
PF(MIN)
to V
SO
10
s
t
FB
V
CC
Rise Time: V
PF(MIN)
to
MAX)
t 0
s
V
PF( R
V
PF
to RST High
t
REC
40 200 ms
Figure 8. +5V POWER-UP/DOWN WAVEFORM TIMING
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POWER-UP/DOWN CHARACTERISTICS
(V
CC
ES
= +3.3V 10%, T
A
= -40°C to +85°C.) (Figure 9)
PARAMETER SYMBOL MIN TYP MAX UNITS NOT
CE or WE at V
IH
,
Before Power-Down
t
PD
0
s
V
CC
Fall Time: V
PF(MAX)
to V
PF(MIN)
t
F
300
s
V
CC
Rise Time: V
PF(MIN)
to V
PF(MAX)
t
R
0
s
V
PF
to
RST
High
t
REC
40 200 ms
Figure 9. +3.3V POWER-UP/DOWN WAVEFORM TIMING
CAPACITANCE
(T
A
= +25C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Capacitance On All Input Pins C
IN
7 pF 1
Capacitance On IRQ /FT, RST , and
DQ Pins
C
IO
10 pF 1
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Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim/Dallas Semiconductor product.
No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2005 Maxim Integrated Products
The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation.
Output L
Input Pulse Levels: 0 to +3V
ment Reference Le :
es: 5ns
NOTES:
2) Typical values are at +25C and nominal supplies.
3) Outputs are open.
AC TEST CONDITIONS
oad: 25pF
Timing Measure vels
Input: +1.5V
Output: +1.5V
Input Pulse Rise and Fall Tim
1) Voltage referenced to ground.
4) Battery switchover occurs at the lower of either the battery voltage or V
PF
.
5) The IRQ /FT and RST outputs are open drain.
6) Using the recommended crystal on X1 and X2.
7) V
CCO
,
CER
, and
OER
pins open.
8) t
AH1
, t
DH1
are measured from WE going high.
9) t
AH2
, t
DH2
are measured from CE going high.
10) Typical measured with V
BAT
at 3.0V. Typical with I
CCO
= 100μA and V
BAT
= 3.0V is V
BAT
- 0.322.
PACKAGE INFORMATION
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
48 TQFP C48+1 21-0054

DS1558W-TRL

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
Real Time Clock
Lifecycle:
New from this manufacturer.
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