s-24c128ci-t8t1u3 Seiko Instruments Inc., s-24c128ci-t8t1u3 Datasheet - Page 8

• Manufacturer Part Number: s-24c128ci-t8t1u3
• Description: 2-wire Serial Eeprom S-24c128c 128k-bit
• Manufacturer: Seiko Instruments Inc.

8
2-WIRE CMOS SERIAL E
S-24C128C
Pin Functions
1. A0, A1 and A2 (Slave Address Input) Pins
2. SDA (Serial Data Input / Output) Pin
3. SCL (Serial Clock Input) Pin
4. WP (Write Protect Input) Pin
In the S-24C128C, to set the slave address, connect each pin of A0, A1, A2 to GND or V
can set 8 types of slave address by a combination of A0, A1, A2 pins.
Comparing the slave address transmitted from the master device and one that you set, makes possible to select
the S-24C128C from other devices connected onto the bus.
Be sure to connect to fix the address input pin to GND or V
Each A0, A1 and A2 pin has a pull-down resistor. In high impedance, these pins are set to the same status as they
are connected to GND.
The SDA pin is used for the bi-directional transmission of serial data. This pin is a signal input pin, and an Nch
open drain output pin.
In use, generally, connect the SDA line to any other device which has the open-drain or open-collector output with
Wired-OR connection by pulling up to V
The SCL pin is used for the serial clock input. Since the signals are processed at a rising or falling edge of the SCL
clock, pay attention to the rising and falling time and comply with the specification.
The write protect is enabled by connecting the WP pin to V
GND or set in high impedance.
Maximum value of
pull-up resistor
[k ]
2
PROM
CC
20
18
16
12
10
14
Figure 7 Output Load
by a resistor ( Figure 7 shows the relation with an output load).
8
6
4
2
0
Seiko Instruments Inc.
10
Value of load capacity
CC
CC
.
. When not using the write protect, connect this pin to
[pF]
f
SCL
= 400 kHz
100
CC
. Therefore the users
Rev.2.0
_00_H