HCC4034B STMICROELECTRONICS [STMicroelectronics], HCC4034B Datasheet - Page 4

• Manufacturer Part Number: HCC4034B
• Description: INPUT/OUTPUT BUS REGISTER 8-STAGE STATIC BIDIRECTIONAL PARALLEL/SERIAL
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

HCC/HCF4034B
LOGIC DIAGRAM AND TRUTH TABLE
REGISTER STAGE (1 of 8 stages)
FOR REGISTER INPUT-LEVELS AND RESULTING REGISTER OPERATION
* Outputs change at positive transition of clock in the serial mode and when the A/S control inputs is ”low” in the parallel
mode.
4/16
Enable
”A”
CL
0
0
0
0
0
0
1
1
1
1
1
1
= LEVEL CHANGE
=
M
INPUTS
INVALID CONDI-
P/S
CL
0
0
1
1
1
1
0
0
1
1
1
1
S
A/B
0
1
0
0
1
1
0
1
0
0
1
1
D
X
0
0
0
1
1
1
OUT
Q
0
0
0
1
1
A/S
X
X
X
X
0
1
0
1
0
1
0
1
Serial Mode ; Synch. Serial Data Input, ”A” Parallel Data Outputs Disabled
Serial Mode ; Synch. Serial Data Input, ”B” Parallel Data Output
Parallel Mode ; ”B” Synch. Parallel Data Inputs, ”A” Parallel Data Outputs
Disabled
Parallel Mode ; ”B” Asynch. Parallel Data Inputs, ”A” Parallel Data Outputs
Disabled
Parallel Mode ; ”A” Parallel Data Inputs Disabled, ”B” Parallel Data Outputs,
Synch. Data Recirculation
Parallel Mode ; ”A” Parallel Data Inputs Disabled, ”B” Parallel Data Outputs,
Asynch. Data Recirculation
Serial Mode ; Synch. Serial Data Input, ”A” Parallel Data Output
Serial Mode ; Synch. Serial Data Input, ”B” Parallel Data Output
Parallel Mode ; ”B” Synch. Parallel Data Input, ”A” Parallel Data Output
Parallel Mode ; ”B” Asynch. Parallel Data Input, ”A” Parallel Data Output
Parallel Mode ; ”A” Synch. Parallel Data Input, ”B” Parallel Data Output
Parallel Mode ; ”A” Asynch. Parallel Data Input, ”B” Parallel Data Outpu
Operation*