MC74HCT4851A, MC74HCT4852A
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4
DC CHARACTERISTICS — Analog Section
Symbo
l
Parameter Condition V
CC
Guaranteed Limit
Unit
−55 to 25°C 85°C 125°C
R
on
Maximum “ON” Resistance V
in
= V
IL
or V
IH
; V
IS
= V
CC
to
GND (Note 1); I
S
2.0 mA
(Note 2)
4.5
5.5
550
400
650
500
750
600
W
DR
on
Delta “ON” Resistance V
in
= V
IL
or V
IH
; V
IS
= V
CC
/2
(Note 1); I
S
2.0 mA (Note 2)
4.5
5.5
80
60
100
80
120
100
W
I
off
Maximum Off−Channel Leakage Current,
Any One Channel
Common Channel
V
in
= V
CC
or GND
5.5 ±0.1
±0.1
±0.1
±0.1
±0.1
±0.1
mA
I
on
Maximum On−Channel Leakage
Channel−to−Channel
V
in
= V
CC
or GND
5.5 ±0.1 ±0.1 ±0.1
mA
1. V
IS
is the input voltage of an analog I/O pin.
2. I
S
is the currebnt flowing in or out of analog I/O pin.
AC CHARACTERISTICS (C
L
= 50 pF, Input t
r
= t
f
= 6 ns, V
CC
= 5.0 V ± 10%)
Symbol
Parameter V
CC
−55 to 25°C 85°C 125°C Unit
t
PHL
,
t
PLH
Maximum Propagation Delay, Analog Input to Analog Output 5.0 40 45 50 ns
t
PHL
,
t
PHZ,PZH
t
PLH
,
t
PLZ,PZL
Maximum Propagation Delay, Enable or Channel−Select to Analog Output 5.0 80 90 100 ns
C
in
Maximum Input Capacitance Digital Pins
(All Switches Off) Any Single Analog Pin
(All Switches Off) Common Analog Pin
10
35
40
10
35
40
10
35
40
pF
C
PD
Power Dissipation Capacitance Typical 5.0 20 pF
INJECTION CURRENT COUPLING SPECIFICATIONS (V
CC
= 5V, T
A
= −55°C to +125°C)
Symbol
Parameter Condition Typ Max Unit
VD
out
Maximum Shift of Output Voltage of Enabled Analog Channel
I
in
* 1 mA, R
S
3,9 kW
I
in
* 10 mA, R
S
3,9 kW
I
in
* 1 mA, R
S
20 kW
I
in
* 10 mA, R
S
20 kW
0.1
1.0
0.5
5.0
1.0
5.0
2.0
20
mV
* I
in
= Total current injected into all disabled channels.
MC74HCT4851A, MC74HCT4852A
www.onsemi.com
5
Figure 5. Typical On Resistance V
CC
= 4.5V
Figure 6. Injection Current Coupling Specification
Current Source
HP4155C
Smu #2
Vin1 = 4.9 V (Smu3)
Iin1 measure here
Vm1 connected here.
Vin2 / Iin2 meas. here.
GND or V
SS
3
NOTES: Rs = 3.9 KW or 20 KW.
NOTES: Vm1 & Vm2 are internal
NOTES: HP4155C Voltmeters.
16
4
13
6
8
External DC P.S.
V
CC
= 5 V
X
Vout
Vm2 connected here.
X7
X0
RS
MC74HCT4851A, MC74HCT4852A
www.onsemi.com
6
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
Common Out
V
CC
HCT4051A Microcontroller
A/D - Input
V
CC
5V
6V5V
Sensor
(8x Identical Circuitry)
Figure 7. Actual Technology
Requires 32 passive components and one extra 6V regulator
to suppress injection current into a standard HCT4051 multiplexer
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
Common Out
V
CC
HCT4851A Microcontroller
A/D - Input
V
CC
5V
Sensor
(8x Identical Circuitry)
Figure 8. MC74HCT4851A Solution
Solution by applying the HCT4851A multiplexer

NLVHCT4851ADTR2G

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Encoders, Decoders, Multiplexers & Demultiplexers ANALOG MUX/DEMUL
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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