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Seiko Instruments Electronic Components Datasheet


S-3511A

REAL-TIME CLOCK



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S-3511A pdf
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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S-3511A pdf
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.



Part Number S-3511A
Description REAL-TIME CLOCK
Maker Seiko - Seiko
Total Page 28 Pages
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