Datasheet

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