DS1302 Trickle-Charge Timekeeping Chip
CAPACITANCE
(T
A
= +25°C)
PARAMETER
Input Capacitance
I/O Capacitance
SYMBOL
C
I
C
I/O
MIN
TYP
10
15
MAX
UNITS
pF
pF
AC ELECTRICAL CHARACTERISTICS
(T
A
= 0°C to +70°C or T
A
= -40°C to +85°C.) (Note 1)
PARAMETER
Data to CLK Setup
CLK to Data Hold
CLK to Data Delay
CLK Low Time
CLK High Time
CLK Frequency
CLK Rise and Fall
CE to CLK Setup
CLK to CE Hold
CE Inactive Time
CE to I/O High Impedance
SCLK to I/O High Impedance
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
SYMBOL
V
CC
= 2.0V
t
DC
V
CC
= 5V
V
CC
= 2.0V
t
CDH
V
CC
= 5V
V
CC
= 2.0V
t
CDD
V
CC
= 5V
V
CC
= 2.0V
t
CL
V
CC
= 5V
V
CC
= 2.0V
t
CH
V
CC
= 5V
V
CC
= 2.0V
t
CLK
V
CC
= 5V
V
CC
= 2.0V
t
R
, t
F
V
CC
= 5V
V
CC
= 2.0V
t
CC
V
CC
= 5V
V
CC
= 2.0V
t
CCH
V
CC
= 5V
V
CC
= 2.0V
t
CWH
V
CC
= 5V
V
CC
= 2.0V
t
CDZ
V
CC
= 5V
V
CC
= 2.0V
t
CCZ
V
CC
= 5V
CONDITIONS
(Note 6)
(Note 6)
(Notes 6, 7, 8)
(Note 6)
(Note 6)
(Note 6)
MIN
200
50
280
70
1000
250
1000
250
DC
4
1
240
60
4
1
TYP
MAX
UNITS
ns
ns
800
200
ns
ns
ns
0.5
2.0
2000
500
MHz
ns
μs
ns
μs
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
280
70
280
70
ns
ns
Limits at -40°C are guaranteed by design and are not production tested.
All voltages are referenced to ground.
I
CC1T
and I
CC2T
are specified with I/O open, CE and SCLK set to a logic 0.
I
CC1A
and I
CC2A
are specified with the I/O pin open, CE high, SCLK = 2MHz at V
CC
= 5V; SCLK = 500kHz, V
CC
= 2.0V.
CE, SCLK, and I/O all have 40kΩ pulldown resistors to ground.
Measured at V
IH
= 2.0V or V
IL
= 0.8V and 10ns maximum rise and fall time.
Measured at V
OH
= 2.4V or V
OL
= 0.4V.
Load capacitance = 50pF.
I
CC1S
and I
CC2S
are specified with CE, I/O, and SCLK open.
V
CC
= V
CC2
, when V
CC2
> V
CC1
+ 0.2V; V
CC
= V
CC1
, when V
CC1
> V
CC2
.
V
CC2
= 0V.
V
CC1
= 0V.
Typical values are at +25°C.
11 of 13
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