Real Time Clock Modules
Surface Mount Type Digital Temperature Compensated RTC Modules
KR3225Y Series
CMOS/ 3.0V Typ./ 3.2×2.5mm
Features
RoHS Compliant
How to Order
• Miniature SMD type (3.2×2.5×1.0mm)
• Built-in 32.768kHz D-TCXO
• Excellent frequency stability : ±5.0x10-6/ -40 to +85°C
• Low supply current : 0.6μA typ (VDD=3.0V)
• Temperature compensated voltage range : 2.0V to 5.5V
• Time keeping voltage range : 1.3V to 5.5V
• I2C-BUS interface voltage range : 1.5V to 5.5V
• I2C-BUS serial interface type : 400kHz
high speed type
• Frequency selection function :
32.768kHz, 1024Hz, 32Hz, 1Hz
• Voltage detection function : 2.0V temp.
compensated voltage detection
1.5V Low Voltage Detection
• Various functions including full calender,
alarm and timer
Frequency Tolerance (vs Temp.) : ±3.8×10-6/ -10°C to 60°C
KR3225Y 32768 D G R 30 T xx
①
②
③ ④ ⑤ ⑥ ⑦ ⑧
Frequency Tolerance (vs Temp.) : ±5.0×10-6/ -40°C to 85°C
KR3225Y 32768 E A W 30 T xx
①
②
③ ④ ⑤ ⑥ ⑦ ⑧
O
② utput Frequency
① Series
③ Frequency Stability ④ Lower Temperature
-40°C
A No Temp. Compensated
A
-10°C
±3.8×10-6
G
D
±5.0×10-6
E
⑥ Supply Voltage
⑤ Upper Temperature
30
3.0V
+85°C
+60°C
W
R
33
50
3.3V
5.0V
⑦ Initial Frequency
Applications
Tolerance
• High accuracy time references
5±5×10-6
A
0±5×10-6
B
T
TCXO
⑧ Option Code
Packaging (Tape & Reel 3000pcs/ reel)
Specifications
Pin Functions
Item
Symbol
Nominal Frequency
f_nom
Time Keeping Voltage
VDD
Temperature Compensation Voltage VTEM
Interface Voltage
VINT
Operationg Temperature Range T_use
Frequency Stability vs. Temp. fo-Tc
Start up Time
t_str
Power Supply Current1
ICC1
Power Supply Current2
ICC2
Low Voltage Detection Voltage
Specification
Conditions
Min. Typ. Max.
—
—
—
No condensation
E : Ta=-40 to +85°C
Ta=25°C
Ta=-40 to +85°C
SCL=SDA=/ INT=VDD, CLKOE=VSS
CLKOUT Non-operating output
VDD=3V
SCL=SDA=/ INT=VDD, CLKOE=VDD
CLKOUT output 32.768kHz, VDD=3V
Output at no load
SCL=SDA=/ INT=VDD, CLKOE=VDD
CLKOUT output 32.768kHz, VDD=3V
CL=15pF
— 32.768 —
1.3 3.0 5.5
2.0 3.0 5.5
1.5 3.0 5.5
-40 +25 +85
-5.0 — +5.0
—
—
1.0
—
—
3.0
Unit
kHz
V
V
V
°C
×10-6
sec
sec
Pin Name I/ O
Function
CLKOE
I
Input to control the output
mode of the CLKOUT
/ INT
O
Outputs for alarm signals, timer signals,
timer update signals and other signals
Vss
—
Pin connected to ground
CLKOUT
O
32.768kHz signal output
(CMOS output)
Serial clock input for I2C BUS
communications
Block Diagram
0.6
2.0
μA
SCL
I
—
1.5
4.0
μA
SDA
I/ O
Serial data input output for
I2C BUS communications
—
2.7
5.5
μA
VDD
—
This pin is connected to a
positive power supply
1.3
VDET
—
1.4
1.5
V
Dimensions
(Unit: mm)
Recommended Land Pattern
(Unit: mm)
3.2±0.2
#8
#7
#6
#5
ALARM
REGISTER
SDA
TIMER
REGISTER
/ INT
1.1
#1
0.5
#2
#3
#4
1.1
I2C-BUS
INTERFACE
#4
0.7
SCL
INTERRUPT
CONTROL
0.35
CLKOE
CLKOUT
CONTROL
C0.15
0.45
CLKOUT
#3
0.85
#2
0.55
#8
#7
#6
0.4
0.5
0.5
0.5
VSS
#1
CLOCK
CALENDER
COUNTER
0.6
0.85
VDD
K
0.6
0.27
EEPROM
DIVIDER
1.0 max.
32.768kHz
2.5±0.2
0.55
#5
R0.15
Pin No
#1
#2
#3
#4
#5
#6
#7
#8
Function
CLKOE
/ INT
N.C
VSS
CLKOUT
SCL
SDA
VDD
0.4
0.4
0.4
Note: A capacitor of value 0.01µF between
VDD and GND is recommended.
