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M54995FP 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
l Serial input and serial or parallel output
l Serial output enables cascade connection
l Built-in latch for each stage
l Enable input provides output control
l Low supply current (standby current ICC=10mA)
l Serial I/O level is compatible with typical CMOS devices
l Driver features: High withstand voltage (BVCEO=30V)
l Wide operating temperature range Ta=-20 – +75C

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 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.

PinNameDescription IC405 in President George
1T
2S-IN
3L-GND
4Vcc
5S-OUT
6LATCH
7/EN
8P-GND
9/O8S/RF
10/O7SWR
11/O6CAL
12/O5MUTE
13/O4PA
14/O3T/R
15/O2DIM
16/O1

PinNameDescription IC406 in President George
1T
2S-IN
3L-GND
4Vcc
5S-OUT
6LATCH
7/EN
8P-GND
9/O8ECHO
10/O7HI CUT
11/O6NB/ANL
12/O5USB
13/O4LSB
14/O3AM
15/O2FM
16/O1


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