Device operation
M41T00
2.7
Characteristics
Table 2.
Symbol
AC characteristics
Parameter(1)
Min
0
Typ
Max Units
fSCL
tLOW
tHIGH
tR
SCL clock frequency
Clock low period
100
kHz
µs
4.7
4
Clock high period
µs
SDA and SCL rise time
SDA and SCL fall time
1
µs
tF
300
ns
START condition hold time
(after this period the first clock pulse is generated)
t
HD:STA
SU:STA
tHD:DAT(2)
4
µs
START condition setup time
(only relevant for a repeated start condition)
t
4.7
0
µs
ns
Data hold time
t
SU:DAT Data setup time
SU:STO STOP condition setup time
Time the bus must be free before a new
250
4.7
ns
µs
t
tBUF
4.7
µs
transmission can start
1. Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 2.0 to 5.5 V (except where noted).
2. Transmitter must internally provide a hold time to bridge the undefined region (300 ns max) of the falling
edge of SCL.
2.8
READ mode
In this mode, the master reads the M41T00 slave after setting the slave address (see
Figure 7). Following the WRITE mode control bit (R/W = 0) and the acknowledge bit, the
word address An is written to the on-chip address pointer. Next the START condition and
slave address are repeated, followed by the READ mode control bit (R/W = 1). At this point,
the master transmitter becomes the master receiver. The data byte which was addressed
will be transmitted and the master receiver will send an acknowledge bit to the slave
transmitter. The address pointer is only incremented on reception of an acknowledge bit.
The M41T00 slave transmitter will now place the data byte at address An+1 on the bus. The
master receiver reads and acknowledges the new byte and the address pointer is
incremented to An+2.
This cycle of reading consecutive addresses will continue until the master receiver sends a
STOP condition to the slave transmitter.
An alternate READ mode may also be implemented, whereby the master reads the M41T00
slave without first writing to the (volatile) address pointer. The first address that is read is the
last one stored in the pointer.
10/25
STMICROELECTRONICS [ ST ]
