s-24c08ci-t8t1u3 Seiko Instruments Inc., s-24c08ci-t8t1u3 Datasheet - Page 22

• Manufacturer Part Number: s-24c08ci-t8t1u3
• Description: 2-wire Serial Eeprom S-24c08c 8k-bit
• Manufacturer: Seiko Instruments Inc.

22
2-WIRE CMOS SERIAL E
S-24C08C
Using S-24C08C
1. Adding a pull-up resistor to SDA I/O pin and SCL input pin
2. Equivalent circuit of I/O pin
In consideration of I
The S-24C08C cannot transmit normally without using a pull-up resistor.
In case that the SCL input pin of the S-24C08C is connected to the Nch open drain output pin of the master device,
connect the SCL pin with a pull-up resistor. As well, in case the SCL input pin of the S-24C08C is connected to the tri-
state output pin of the master device, connect the SCL pin with a pull-up resistor in order not to set it in high
impedance. This prevents the S-24C08C from error caused by an uncertain output (high impedance) from the tri-state
pin when resetting the master device during the voltage drop.
The SCL pin and the SDA pin do not have a built-in pull-down or pull-up resistor.
The WP and A2 pins has a built-in pull-down resistor. The SDA pin has an open-drain output.
The followings are equivalent circuits of the pins.
SCL
SDA
2
C-bus protocol function, the SDA I/O pins should be connected with a pull-up resistor.
2
PROM
Seiko Instruments Inc.
Figure 23 SCL Pin
Figure 24 SDA Pin
Rev.2.0
_00_H