DS1388Z-3 MAXIM [Maxim Integrated Products], DS1388Z-3 Datasheet - Page 8

• Manufacturer Part Number: DS1388Z-3
• Description: I2C RTC/Supervisor with Trickle Charger and 512 Bytes EEPROM
• Manufacturer: MAXIM [Maxim Integrated Products]

I
and 512 Bytes EEPROM
8
V
2
BACKUP
PIN
GND
1
2
3
4
5
6
7
8
SDA
V
RST
SCL
C RTC/Supervisor with Trickle Charger
_____________________________________________________________________
X2
X1
CC
V
NAME
BACKUP
GND
SDA
SCL
RST
V
X1
X1
CC
TRICKLE CHARGER
POWER CONTROL
Connections for a Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is designed for
operation with a crystal having a specified load capacitance (C
and can optionally be connected to an external 32.768kHz oscillator. The output of the internal oscillator, pin
X2, is floated if an external oscillator is connected to pin X1.
Connection for a Secondary Power Supply. Supply voltage must be held between 1.3V and 5.5V for proper
operation. This pin can be connected to a primary cell, such as a lithium button cell. Additionally, this pin can
be connected to a rechargeable cell or a super cap when used with the trickle-charge feature. If not used,
this pin must be connected to ground. UL recognized to ensure against reverse charging current when used
with a lithium battery. ( www.maxim-ic.com/qa/info/ul/ )
Ground
Serial Data Output. SDA is the input/output for the I
external pullup resistor.
Serial Clock Input. SCL is the clock input for the I
the serial interface.
Active-Low, Open-Drain Reset Output. This pin indicates the status of V
V
impedance. The active-low, open-drain output is combined with a debounced pushbutton input function. This
pin can be activated by a pushbutton reset request. It has an internal 50kΩ nominal value pullup resistor to
V
the oscillator is added to the t
DC Power Pin for Primary Power Supply
CLOCK DIVIDER
OSCILLATOR/
CC
CC
INTERFACE
. No external pullup resistors should be connected. If the crystal oscillator is disabled, the startup time of
AND
falls below V
I
2
C
PF
, the RST pin is driven low. When V
STAT/CTRL/TRICKLE
RST
WATCHDOG
BLOCK 0
delay.
TIMER
RTC
2
FUNCTION
C interface and is used to synchronize data movement on
2
C serial interface. This pin is open drain and requires an
CC
exceeds V
INTERFACE
BLOCK 1
EEPROM
EEPROM
L
) of 6.0pF. Pin X1 is the input to the oscillator
PF
, for t
CC
relative to the V
RST
, the RST pin is driven high
Pin Description
Block Diagram
EEPROM
PF
BLOCK 2
DS1388
specification. As