Mitsubishi M54995P, M54995FP Datasheet
MITSUBISHI <CONTROL / DRIVER IC>
)
M54995P/FP
Bi-CMOS 8-BIT SERIAL-INPUT LATCHED DRIVER
DESCRIPTION
The M54995 is a semiconductor integrated circuit consisting of 8
stages of CMOS shift registers and latches with serial inputs and
serial or parallel outputs. It is based on Bi-CMOS process
technology, and has 8 bipolar drivers at the parallel outputs.
FEATURES
● Serial input and serial or parallel output
● Serial output enables cascade connection
● Built-in latch for each stage
● Enable input provides output control
● Low supply current (standby current ICC≤10µA)
● Serial I/O level is compatible with typical CMOS devices
● Driver features: High withstand voltage (BVCEO≥30V)
● Wide operating temperature range Ta=-20 – +75°C
APPLICATION
Dot drivers for thermal print heads. Serial/parallel conversion.
Drivers for relays and solenoids.
FUNCTION
The M54995 consists of 8 stages of D-type flip flops connected to
8 latches.
Data is input to serial input S-IN, and clock pulses are input to
clock input T. When the clock changes from low to high, the input
data enters the first shift register and data already in the shift
registers is shifted sequentially.
The serial output S-OUT is used to connect multiple M54995 to
expand the number of parallel outputs. S-OUT is connected to S-IN
PIN CONFIGURATION(TOP VIEW
1
→
S-IN
L-GND
V
S-OUT
LATCH
EN
P-GND
T
2
→
3
4
CC
←
→
→
Clock
Serial input
Logic GND
Power supply
Serial output
Latch input
Enable input
Driver GND
Outline 16P4(P)
of the next stage.
For parallel output. When the clock pulse changes from low to
high, latch input (LATCH) is high and output enable input (EN) is
low the serial input data at S-IN appears at output O1 and the other
data already present is shifted sequentially to outputs O2 through
O8.
The parallel outputs are inverted.
When the latch input is held low, the latch retains the stored data.
When the EN input is high, outputs O1 through O8 all turn off. As
the internal logic is unstable when the power is turned on, the EN
input should be kept high (setting outputs O1 through O8 off) until
input data is set and the internal logic is initialized.
L-GND is the GND of CMOS logic circuit and P-GND is the GND of
output driver circuits O1 through O8 which employ bipolar
transistors capable of large drive currents.
16
→
15
M54995P/FP
→
14
→
13
→
125
→
116
→
107
→
98
→
16P2N-A(FP)
O1
O2
O3
O4
O5
O6
O7
O8
Parallel outputs
BLOCK DIAGRAM
Power supply
V
LATCHLatch input
S-INSerial input
Parallel outputs
O1
O2
O3
O4
O5
O6
O7
O8
16
15 14 13 12 11 10 9
CC
4
ENEnable input
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
QTD
QTD
QTD
QTD
QTD
QTD
QTD
2 S-OUT
TClock
1
3
L-GND
Logic GND
QTD
8
P-GND
Driver GND
5
Serial output
TIMING CHART
MITSUBISHI <CONTROL / DRIVER IC>
M54995P/FP
Bi-CMOS 8-BIT SERIAL-INPUT LATCHED DRIVER
S-INSerial input
TClock
LATCHLatch input
ENEnable input
O1
O2
O3
Parallel outputs
O4
O5
O6
O7
O8
S-OUTSerial output
*
The state of the shaded part is unstable.
INPUT/OUTPUT CIRCUIT DIAGRAM
1 Inputs with pullup resistor
(EN, LATCH)
RIN
VCC
2 Inputs with pulldown resistor
(T, S-IN)
RIN
VCC
3 Serial output
(S-OUT)
VCC
L-GND
L-GND
4 Parallel outputs
(O1 – O8)
L-GND
VCC
P-GND
L-GND
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