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BR93LL46FV View Datasheet(PDF) - ROHM Semiconductor

Part Name
Description
View to exact match
BR93LL46FV
ROHM
ROHM Semiconductor ROHM
BR93LL46FV Datasheet PDF : 11 Pages
1 2 3 4 5 6 7 8 9 10
Memory ICs
Operation notes
(5) Connecting DI and DO directly
The BR93LL46F / FV have an independent input pin
(DI) and output pin (DO). These are treated as individ-
ual signals on the timing chart but can be controlled
through one control line. Control can be initiated on a
single control line by treating these signals as separate
in the timing chart.
1) Data collision between the µ-COM output and the
DO output
Within the input and output timing of the BR93LL46F /
FV, the drive from the µ-COM output to the DI input
and a signal output from the DO output can be emitted
at the same time. This happens only for the 1 clock
cycle (a dummy bit “0” is output to the DO pin) which
acquires the A0 address data during a read cycle.
When the address data A0 = 1, a feedthrough cur-
rent path occurs.
Timing after a write command, when CS is HIGH
A READY or BUSY function is output on the DO pin.
When the next start bit is input, DO goes to the high
impedance state.
When inputting a command after a write, when the
CS input rises while the µ-COM output remains LOW,
a READY output HIGH is output from the DO pin and
feedthrough current paths can occur.
2) When the µ-COM port is the CMOS port
The µ-COM port can be controlled by the 1 control line
by connecting a resistor R between the DI and DO pins
during CMOS input and output, as shown in Figure 7.
In this case, the value of R needs to satisfy the positive
portion of the µ-COM input level for the voltage drop at
R resulting from the leak current of the µ-COM input
and the DI pin. It must be as small as possible so that it
does not influence the DO output noise but large
enough to keep the feedthrough current to a minimum.
A value in the range of 1K-200kis usually sufficient.
Make sure to confirm this through experiment. In this
case, a dummy bit cannot be detected.
3) Feedback to the DI input from the DO output
Data is output from the DO pin and then feeds back
into the DI input through the resistor R. This happens
when:
1. DO data is output during a read operation
2. A READY / BUSY signal is output during a write
operation
Such feedback does not cause problems in the basic
BR93LL46F / BR93LL46FV
operation of the BR93LL46F / FV.
µ-COM
EEPROM
DI
R
DO
Fig. 7 Using the CMOS port
9
 

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