24LCS21AT/SN Microchip Technology, 24LCS21AT/SN Datasheet - Page 13

• Manufacturer Part Number: 24LCS21AT/SN
• Description: IC EEPROM 1KBIT 400KHZ 8SOIC
• Manufacturer: Microchip Technology

Specifications of 24LCS21AT/SN

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 1K (128 x 8)
• Speed: 100kHz, 400kHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

FIGURE 7-2:
FIGURE 7-3:
7.3
Sequential reads are initiated in the same way as a
random read except that after the 24LCS21A transmits
the first data byte, the master issues an acknowledge
as opposed to a Stop condition in a random read. This
directs the 24LCS21A to transmit the next sequentially
addressed 8-bit word (Figure 7-3).
To provide sequential reads the 24LCS21A contains an
internal Address Pointer which is incremented by one
at the completion of each operation. This Address
Pointer allows the entire memory contents to be serially
read during one operation.
© 2007 Microchip Technology Inc.
SDA Line
Bus Activity
Bus Activity
Master
Bus Activity
Master
SDA Line
Bus Activity
Sequential Read
Control
Byte
A
C
K
RANDOM READ
SEQUENTIAL READ
S
T
A
R
T
S
1 0 1 0 0 0 0 0
Data n
Control
Byte
A
C
K
A
C
K
Data n+1
Address
Word
C
A
K
7.4
The 24LCS21A employs a V
circuit which disables the internal erase/write logic if the
V
The SDA, SCL and VCLK inputs have Schmitt Trigger
and filter circuits which suppress noise spikes to assure
proper device operation even on a noisy bus.
A
C
K
CC
S
T
A
R
T
S
is below 1.5 volts at nominal conditions.
Data n+2
1
0
Noise Protection
1
Control
Byte
0
0
0
A
C
K
0
1
A
C
K
24LCS21A
Data n
CC
threshold detector
Data n+X
DS21161H-page 13
N
O
C
A
K
S
T
O
P
P
N
O
A
C
K
S
T
O
P
P