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Rev.1.2
REAL-TIME CLOCK
S-3511A
S-3511A is a CMOS real-time clock IC, which is designed to transfer or
set each data of a clock and calender as requested by a CPU.
It provides connection with a CPU via three wires and has an
interrupt/alarm feature, allowing the alleviation of software treatment on
the side of a host.
It also works on lower power with the oscillating circuit operated at a
constant voltage. The shipping form is either a die or an 8-pin SSOP ultra
compact package.
! Features
!
Low power consumption
: 0.7 µA typ. (VDD=3.0 V)
Wide area of operating voltage : 1.7 to 5.5 V
BCD input/output of year, month, day,
day of a week, hour, minute and second
CPU interface via three wires
Auto calender till the year of 2,099
(automatic leap year arithmetic feature included)
Built-in power voltage detecting circuit
Built-in constant voltage circuit
Built-in flag generating circuit on power on/off
Built-in alarm interrupter
Steady-state interrupt frequency/duty setting feature
Built-in 32 kHz crystal oscillating circuit (Internal Cd, External Cg)
Die or 8-pin SSOP package (pin pitch: 0.65 mm)
Applications
Cellular phone
PHS
A variety of pagers
TV set and VCR
Camera
! Block Diagram
XIN
XOUT
Oscillating
circuit
Timing
generatio
n
INT Register
Comparator
Clock
generating
circuit
INT
Status register
Second Minute
Hour
Day of
week
Day
Month Year
VDD
VSS
Power
voltage
detecting
circuit
Constant
voltage
circuit
Shift register
Serial
Interface
SIO
CS
SCK
Figure 1 Block diagram
Seiko Instruments Inc.
1

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REAL-TIME CLOCK
S-3511A
n Pin Assignment
(1) Package : S-3511AEFS
(2) Die : S-3511AECA
INT
XIN
XOUT
8-pin SSOP
Top view
INT
XIN
XOUT
VSS
1
2
3
4
8 VDD
7 SIO
6 SCK
5 CS
Figure 2 Pin assignment
Y
0
S-3511A
VSS
VDD
SIO
X
SCK
CS
(*1) Die size : 2.10 × 1.60 mm
Sizes shown are for design purposes only.
The corners of the die shrink by approximately 30 µm after dicing.
(*2) Pad size: 100 × 100 µm
Pad Coordinates
Symbol
X-
Y-
Coordinate Coordinate
INT
XIN
XOUT
VSS
890
890
890
890
641
351
114
641
Symbol
VDD
SIO
SCK
CS
X- Y-
Coordinate Coordinate
890 641
890 356
890 240
890 641
Figure 2-2 Pad assignment
2 Seiko Instruments Inc.

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n Description of Pins
Table 1 Description of pins
REAL-TIME CLOCK
S-3511A
Pin No.
1
2
3
4
5
6
7
8
Symbol
INT
XIN
XOUT
VSS
CS
SCK
SIO
VDD
Description
Configuration
Alarm interrupt output pin.
Depending on the mode set by the INT
N-channel open drain
register and status register, it outputs low or output (No protective diode
Clock when time is reached. It is disabled by on the side of VDD)
rewriting the status register.
Crystal oscillator connect pin (32,768 Hz)
(Internal Cd, External Cg)
Negative power supply pin (GND)
Chip select input pin.
During “H” : The SIO pin allows data
CMOS input (Included pull-
input/output.
down resistance. No
The SCK pin allows data input. protective diode on the
During “L” : The SIO pin is in the High-Z side of VDD)
state.
The SCK pin is in the input-
disabled state.
Serial clock input pin.
The input/output of data from the SIO pin is CMOS input (No protective
performed in synchronization with this clock. diode on the side of VDD)
However, the clock is not accepted while the
CS pin is “L.”
Serial data input/output pin.
It
is
normally
in
the
High-Z state while the
CS
N-channel open drain
output (No protective diode
pin is “L”. When the CS pin changes from “L” on the side of VDD)
to “H,” the SIO pin is set to an input pin. It CMOS input
will be set to an input or output pin,
depending on an subsequently input
command.
Positive power supply pin.
Seiko Instruments Inc.
3