Mitsubishi M54975P, M54975FP Datasheet
MITSUBISHI <CONTROL / DRIVER IC>
M54975P/FP
Bi-CMOS 8-BIT SERIAL-INPUT LATCHED DRIVER
DESCRIPTION
The M54975 is a semiconductor integrated circuit fabricated using
Bi-CMOS technology. It contains a serial input to serial/parallel
output 8-bit CMOS shift register and CMOS latch as well as bipolar
8-bit parallel-output driver.
FEATURES
● Serial input to serial/parallel output
● Cascade connections possible through serial output
● Latch circuit included for each stage
● Enable input for output control
● Low supply current .................................. ICC ≥ 10µA at standby
● Serial input/output level is compatible with standard CMOS
● Driver : Withstand voltage ...................................... BVCEO ≥ 30V
Large drive current ................................ (IO(max)=300mA)
● Wide operating temperature range ..................... Ta=-20 – +75°C
APPLICATION
Thermal printer head dot driver, Serial-to parallel conversion, Relay
and Solenoid driver
FUNCTION
The M54975 consists of an 8-bit D-type flip-flop, the output of
which is connected to 8 latches.
When data is applied to the serial data input (S-IN) and a clock
pulse is applied to clock input (T), an “L” to “H” change of the clock
will cause the data input signals to enter the internal shift registers
and the data in the shift registers will be shifted in order.
PIN CONFIGURATION (TOP VIEW)
S-IN
L-GND
V
S-OUT
LATCH
EN
P-GND
T
→
1
→
2
3
M54975P
CC
4
←
→
Outline
16P4(P)
O1
→
16
O2
→
15
O3
→
14
→
O4
13
→
125
→
116
→
107
→
98
Parallel outputs
O5
O6
O7
O8
16P2N-A(FP)
Clock
Serial input
Logic GND
Serial output
Latch input
Enable input
Driver GND
Using a number of M54975 units for bit expansion in series will
entail connecting serial output (S-OUT) to S-IN of the next-stage
M54975.
In parallel output, when the latch input is set to “H” and the outputcontrol input (enable input EN) is “L”, a clock pulse changing from
“L” to “H” will cause the serial data input signal to appear at output
O1, and the data will be shifted in order at outputs O2 – O8.
The parallel output will yield a signal that is inverted with respect to
the serial data input.
Setting the LATCH input to “L” will prevent data from entering the
latch.
When the EN input is set to “H”, all outputs (O1 – O8) will be set to
OFF. Since the internal logic state of the IC is uncertain at poweron time, set the EN input to “H” (and outputs O1 – O8 will set to
BLOCK DIAGRAM
Power supply
CC
V
ENEnable input
LATCHLatch input
S-INSerial input
Parallel outputs
O1
O2
O3
O4
O5
O6
O7
O8
16
15 14 13 12 11 10 9
4
7
Q
Q
Q
Q
Q
Q
Q
Q
L D
L D
L D
L D
L D
L D
L D
L D
6
2
TClock
1
3
L-GND
Logic GND
QTD
QTD
QTD
QTD
QTD
QTD
QTD
QTD
8
5
Driver GNDP-GND
Serial outputS-OUT
MITSUBISHI <CONTROL / DRIVER IC>
M54975P/FP
Bi-CMOS 8-BIT SERIAL-INPUT LATCHED DRIVER
OFF) until the input data is set and the internal logic state has been
determined.
L-GND is the ground of the CMOS logic circuit section and P-GND
TIMING CHART
S-IN
T
LATCH
EN
O1
O2
O3
O4
O5
O6
O7
O8
is the ground for the output driver section (O1 – O8), which is
made up of bipolar transistors that are capable of driving large
currents.
S-OUT
*
The state of the shaded part is unstable.
INPUT/OUTPUT CIRCUIT DIAGRAM
1
3 4
Inputs with pullup resistor
(EN, LATCH)
RIN
Serial output
(S-OUT)
VCC
VCC
L-GND
2
Inputs with pulldown resistor
(T, S-IN)
RIN
VCC
L-GND
Parallel outputs
(O1 – O8)
1.5kΩ
L-GND
P-GND
L-GND
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