MC14512B Motorola, MC14512B Datasheet - Page 4

• Manufacturer Part Number: MC14512B
• Description: 8-Channel Data Selector
• Manufacturer: Motorola

tors can be connected to a single date bus as shown. One
MC14512B is selected by the 3–state control, and the re-
maining devices are disabled into a high–impedance “off”
state. The number of 8–bit data selectors, N, that may be
connected to a bus line is determined from the output drive
current, I OD , 3–state or disable output leakage current, I TL ,
MOTOROLA CMOS LOGIC DATA
X0
X1
X2
X3
X4
X5
X6
X7
Output terminals of several MC14512B 8–Bit Data Selec-
C
B
A
GENERATOR
13
12
11
1
2
3
4
5
6
7
9
PULSE
V SS
V DD
S3
S4
DISABLE
INHIBIT
A
B
C
X0
X1
X2
X3
X4
X5
X6
X7
V DD
V SS
Z
Figure 3. 3–State AC Test Circuit and Waveform
C L
3–STATE MODE OF OPERATION
1 k
IN
TRANSMISSION
t PHZ
t PZH
t PLZ
t PZL
Test
V DD
1
GATE
Switch Positions for 3–State Test
S1
S2
V SS
2
LOGIC DIAGRAM
OUT
Closed
Closed
Open
Open
S1
IN
OUTPUT
OUTPUT
DISABLE
INPUT
Closed
Closed
Open
Open
and the load current, I L , required to drive the bus line (includ-
ing fanout to other device inputs), and can be calculated by:
N must be calculated for both high and low logic state of the
bus line.
S2
20 ns
V SS
t PLZ
t PHZ
1
2
DISABLE
INHIBIT
V DD
15
10
14
Closed
Closed
Open
Open
S3
Z
OUT
10%
50%
90%
10%
90%
Closed
Closed
Open
Open
S4
N =
SELECTED
MC14512B
MC14512B
MC14512B
DEVICE
I OD – I L
20 ns
10%
90%
I TL
V SS
t PZH
t PZL
V DD
V OH
V OL
V OH
V OL
I OD
I TL
I TL
+ 1
DATA
BUS
10 V @ V DD = 15 V
2.5 V @ V DD = 5 V,
2 V @ V DD = 5 V
6 V @ V DD = 10 V
10 V, AND 15 V
I L
MC14512B
LOAD
373