24
R - 2 2 A T
R-23AM
R - 2 4 A T
2-2 Memory IC (IC2) FOR R-24AT / R-22AT
AT24C04 is a 4K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 512
registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output signal for IC2
are as shown in the following diagram.
Figure T-2. Relation between Pin Nos, and Signals
Pin No.
Signal
I/O
Description
1-3
A0-A2
IN
Connected to GND.
4
VSS
IN
Connected to VC(-5V).
5
SDA
IN/OUT
Serial data input/output : input/outputs data to IC1.
6
SCL
IN
Clock signal input : input/outputs serial data at every one pulse.
7
TEST
IN
Connected to VC(-5V).
8
VCC
IN
Connected to GND.
A0
8
1
7
2
6
3
5
4
A1
A2
VSS
VCC
TEST
SCL
SDA
TOP VIEW
FUNCTIONAL DIAGRAM
E PROM
512 x 8
2
START
STOP
LOGIC
CONTROL
LOGIC
SLAVE ADDRESS
REGISTER
COMPARATOR
H.V. GENERATION
TIMING
& CONTROL
64
YDEC
8
DATA REGISTER
Dout
CK
3
1
5
64
XDEC
START CYCLE
INC
LOAD
WORD
ADDRESS
COUNTER
R/W
PIN
Dout
ACK
(6) SCL
(5) SDA
(4) Vss
(3) Vcc
