DS17285E3 MAXIM [Maxim Integrated Products], DS17285E3 Datasheet - Page 7

• Manufacturer Part Number: DS17285E3
• Description: Real-Time Clocks
• Manufacturer: MAXIM [Maxim Integrated Products]

(V
CC
12, 16
400
350
300
250
200
4–11
2, 3
24
= +3.3V, T
1
2.5
V
CC
PIN
= 0V
2.8
21, 22, 26
12–17,
19, 20
A
vs. INPUT VOLTAGE
9, 10
SUPPLY CURRENT
28
= +25°C, unless otherwise noted.)
8
3.0
V
BAT
(V)
AD0–AD7
3.3
NAME
X1, X2
PWR
GND
3.5
Active-Low Power-On Reset. This open-drain output pin is intended for use as an on/off control
for the system power. With V
activated from a kickstart input by the KS pin or from a wake-up interrupt. Once the system is
powered on, the state of PWR can be controlled by bits in the control registers. The PWR pin
can be connected through a pullup resistor to a positive supply. For 5V operation, the voltage
of the pullup supply should be no greater than 5.7V. For 3V operation, the voltage on the
pullup supply should be no greater than 3.9V.
Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is
designed for operation with a crystal having a specified load capacitance (C
12.5pF. Pin X1 is the input to the oscillator 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. These pins are missing (N.C.) on the EDIP package.
Multiplexed Bidirectional Address/Data Bus. The addresses are presented during the first
portion of the bus cycle and latched into the device by the falling edge of ALE. Write data is
latched by the rising edge of WR. In a read cycle, the device outputs data during the latter
portion of the RD low. The read cycle is terminated and the bus returns to a high-impedance
state as RD transitions high.
Ground
3.8
_____________________________________________________________________
400
350
300
250
-40
V
BAT
-25
= 3.0V
-10
vs. TEMPERATURE
SUPPLY CURRENT
TEMPERATURE (°C)
5
CC
20
voltage removed from the device, PWR can be automatically
Typical Operating Characteristics
35
50
65
FUNCTION
80
Real-Time Clocks
32768.7
32768.6
32768.5
32768.4
32768.3
32768.2
32768.1
32768.0
2.5
3.0
OSCILLATOR FREQUENCY
Pin Description
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
3.5
L
4.0
) of 6pF or
4.5
5.0
5.5
7