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DS1340Z-3

P1-P3P4-P6P7-P9P10-P12P13-P14
General Description
The DS1340 is a real-time clock (RTC)/calendar that is
pin compatible and functionally equivalent to the ST
M41T00, including the software clock calibration. The
device additionally provides trickle-charge capability
on the V
BACKUP
pin, a lower timekeeping voltage, and
an oscillator STOP flag. Block access of the register
map is identical to the ST device. Two additional regis-
ters, which are accessed individually, are required for
the trickle charger and flag. The clock/calendar pro-
vides seconds, minutes, hours, day, date, month, and
year information. A built-in power-sense circuit detects
power failures and automatically switches to the back-
up supply. Reads and writes are inhibited while the
clock continues to run. The device is programmed seri-
ally through an I
2
C
*
bidirectional bus.
Applications
Portable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications
Features
♦ Enhanced Second Source for the ST M41T00
♦ Available in a Surface-Mount Package with an
Integrated Crystal (DS1340C)
♦ Fast (400kHz) I
2
C Interface
♦ Software Clock Calibration
♦ RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year
♦ Automatic Power-Fail Detect and Switch Circuitry
♦ Trickle-Charge Capability
♦ Low Timekeeping Voltage Down to 1.3V
♦ Three Operating Voltage Ranges (1.8V, 3V, and 3.3V)
♦ Oscillator Stop Flag
♦ Available in 8-Pin µSOP or SO Packages
♦ Underwriters Laboratory (UL) Recognized
DS1340
I
2
C RTC with Trickle Charger
______________________________________________ Maxim Integrated Products 1
Ordering Information
4
CPU
V
CC
V
CC
V
CC
5
6
8
12
SDA
SCL
GND
X2X1
V
CC
C1
R
PU
R
PU
CRYSTAL
FT/OUT
V
BACKUP
3
7
R
PU
= t
R
/ C
B
DS1340
Typical Operating Circuit
Rev 4; 3/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART
TEMP RANGE PIN-PACKAGE
TOP
MARK
†
DS1340Z-18
-40°C to +85°C 8 SO (0.150in)
D1340-18
DS1340Z-3
-40°C to +85°C 8 SO (0.150in)
DS1340-3
DS1340Z-33
-40°C to +85°C 8 SO (0.150in)
D1340-33
DS1340U-18
-40°C to +85°C
8 µSOP
1340A1-18
DS1340U-3
-40°C to +85°C
8 µSOP 1340A1-3
DS1340U-33
-40°C to +85°C
8 µSOP
1340A1-33
DS1340C-18
-40°C to +85°C
16 SO 1340C-18
DS1340C-3
-40°C to +85°C
16 SO 1340C-3
DS1340C-33
-40°C to +85°C
16 SO 1340C-33
DS1340Z-18+
-40°C to +85°C 8 SO (0.150in)
D1340-18
DS1340Z-3+
-40°C to +85°C 8 SO (0.150in)
DS1340-3
DS1340Z-33+
-40°C to +85°C 8 SO (0.150in)
D1340-33
DS1340U-18+
-40°C to +85°C
8 µSOP
1340A1-18
DS1340U-3+
-40°C to +85°C
8 µSOP 1340A1-3
DS1340U-33+
-40°C to +85°C
8 µSOP
1340A1-33
DS1340C-18#
-40°C to +85°C
16 SO 1340C-18
DS1340C-3#
-40°C to +85°C
16 SO 1340C-3
DS1340C-33#
-40°C to +85°C
16 SO 1340C-33
*Purchase of I
2
C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I
2
C Patent Rights to use these com-
ponents in an I
2
C system, provided that the system conforms to
the I
2
C Standard Specification as defined by Philips.
Pin Configurations appear at end of data sheet.
+ Denotes a lead-free/RoHS-compliant device.
# Denotes a RoHS-compliant device that may include lead that
is exempt under RoHS requirements. The lead finish is JESD97
category e3, and is compatible with both lead-based and lead-
free soldering processes.
† A "+" anywhere on the top mark denotes a lead-free device.
A "#" denotes a RoHS-compliant device.
DS1340
I
2
C RTC with Trickle Charger
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Range on V
CC
Pin Relative to Ground .....-0.3V to +6.0V
Voltage Range on SDA, SCL, and FT/OUT
Relative to Ground..................................-0.3V to (V
CC
+ 0.3V)
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature Range............................See IPC/JEDEC
J-STD-020 Specification
AC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC MIN
to V
CC MAX
, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1, Figure 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Standard mode 0
100
SCL Clock Frequency f
SCL
Fast mode
100 400
kHz
Standard mode 4.7
Bus Free Time Between STOP
and START Conditions
t
BUF
Fast mode 1.3
µs
Standard mode 4.0
Hold Time (Repeated) START
Condition (Note 2)
t
HD:STA
Fast mode 0.6
µs
Standard mode 4.7
Low Period of SCL Clock t
LOW
Fast mode 1.3
µs
Standard mode 4.0
High Period of SCL Clock t
HIGH
Fast mode 0.6
µs
Standard mode 0 0.9
Data Hold Time (Notes 3, 4)
t
HD:DAT
Fast mode 0 0.9
µs
Standard mode
250
Data Setup Time (Note 5)
t
SU:DAT
Fast mode
100
ns
Standard mode 4.7
START Setup Time t
SU:STA
Fast mode 0.6
µs
Standard mode
20 + 0.1C
B
1000
Rise Time of SDA and SCL
Signals (Note 6)
t
R
Fast mode
20 + 0.1C
B
300
ns
Standard mode
20 + 0.1C
B
300
Fall Time of SDA and SCL Signals
(Note 6)
t
F
Fast mode
20 + 0.1C
B
300
ns
Standard mode 4.7
Setup Time for STOP Condition
t
SU:STO
Fast mode 0.6
µs
Capacitive Load for Each Bus
Line
C
B
(Note 6)
400
pF
I/O Capacitance (SCL, SDA) C
I/O
10 pF
Pulse Width of Spikes that Must
be Suppressed by the Input Filter
t
SP
Fast mode 30 ns
Oscillator Stop Flag (OSF) Delay
t
OSF
(Note 7) 100 ms
DS1340
I
2
C RTC with Trickle Charger
_____________________________________________________________________ 3
RECOMMENDED DC OPERATING CONDITIONS
(V
CC
= V
CC MIN
to V
CC MAX
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 3.3V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
DS1340-18
1.71
1.8
1.89
DS1340-3 2.7 3.0 3.3
Supply Voltage (Note 8) V
CC
DS1340-33
2.97
3.3 5.5
V
Input Logic 1 (SDA, SCL) V
IH
(Note 8)
0.7 x V
CC
V
CC
+ 0.3
V
Input Logic 0 (SDA, SCL) V
IL
(Note 8)
-0.3 +0.3 x V
CC
V
Supply Voltage, Pullup
(FT/OUT, SDA, SCL), V
CC
= 0V
V
PU
(Note 8) 5.5 V
DS1340-18 1.3 3.7
DS1340-3 1.3 3.7
Backup Supply Voltage (Note 8)
V
BACKUP
DS1340-33 1.3 5.5
V
R1 (Notes 9, 10)
250
R2 (Note 11)
2000
Trickle-Charge Current-Limiting
Resistors
R3 (Note 12)
4000
Ω
DS1340-18
1.51
1.6
1.71
DS1340-3
2.45
2.6 2.7
Power-Fail Voltage (Note 8) V
PF
DS1340-33
2.70 2.88 2.97
V
Input Leakage (SCL, CLK) I
LI
-1 +1 µA
I/O Leakage (SDA, FT/OUT) I
LO
-1 +1 µA
V
CC
> 2V; V
OL
= 0.4V 3.0
SDA Logic 0 Output I
OLSDA
1.7V < V
CC
< 2V; V
OL
= 0.2 x V
CC
3.0
mA
V
CC
> 2V; V
OL
= 0.4V 3.0
1.7V < V
CC
< 2V; V
OL
= 0.2 x V
CC
3.0
mA
FT/OUT Logic 0 Output I
OLSQW
1.3V < V
CC
< 1.7V; V
OL
= 0.2x V
CC
250 µA
DS1340-18 72 150
DS1340-3
108
200Active Supply Current (Note 13) I
CCA
DS1340-33
192
300
µA
DS1340-18 60 100
DS1340-3 81 125
Standby Current (Note 14) I
CCS
DS1340-33
100
150
µA
V
BACKUP
Leakage Current
I
BACKUPLKG
V
BACKUP
= 3.7V 100 nA
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BACKUP
= 3.7V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
BACKUP1
OSC ON, FT = 0 (Note 15)
800 1150
I
BACKUP2
OSC ON, FT = 1 (Note 15)
850 1250
V
BACKUP
Current
I
BACKUP3
OSC ON, FT = 0, V
BACKUP
= 3.0V,
T
A
= +25°C (Notes 15, 16)
800 1000
nA
V
BACKUP
Data-Retention Current
I
BACKUPDR
OSC OFF
25.0
100 nA
P1-P3P4-P6P7-P9P10-P12P13-P14

DS1340Z-3

Mfr. #:
Buy DS1340Z-3
Manufacturer:
Maxim Integrated
Description:
Real Time Clock I2C RTC w/Trickle Charger
Lifecycle:
New from this manufacturer.
Delivery:
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