MC68336/376
ELECTRICAL CHARACTERISTICS
MOTOROLA
USER’S MANUAL
Rev. 15 Oct 2000
A-25
Table A-11 QADC Maximum Ratings
Num
Parameter
Symbol
Min
Max
Unit
1
Analog Supply, with reference to V
SSA
V
DDA
– 0.3
6.5
V
2
Internal Digital Supply, with reference to V
SSI
V
DDI
– 0.3
6.5
V
3
Reference Supply, with reference to V
RL
V
RH
– 0.3
6.5
V
4
V
SS
Differential Voltage
V
SSI
– V
SSA
– 0.1
0.1
V
5
V
DD
Differential Voltage
V
DDI
– V
DDA
– 6.5
6.5
V
6
V
REF
Differential Voltage
V
RH
– V
RL
– 6.5
6.5
V
7
V
RH
to V
DDA
Differential Voltage
V
RH
– V
DDA
– 6.5
6.5
V
8
V
RL
to V
SSA
Differential Voltage
V
RL
– V
SSA
– 6.5
6.5
V
9
Disruptive Input Current1, 2, 3, 4, 5, 6, 7
VNEGCLAMP = – 0.3 V
VPOSCLAMP = 8 V
NOTES:
1. Below disruptive current conditions, the channel being stressed has conversion values of $3FF for analog inputs
greater than VRH and $000 for values less than VRL. This assumes that VRH ≤ VDDA and VRL ≥ VSSA due to the
presence of the sample amplifier. Other channels are not affected by non-disruptive conditions.
2. Input signals with large slew rates or high frequency noise components cannot be converted accurately. These
signals also affect the conversion accuracy of other channels.
3. Exceeding limit may cause conversion error on stressed channels and on unstressed channels. Transitions
within the limit do not affect device reliability or cause permanent damage.
4. Input must be current limited to the value specified. To determine the value of the required current-limiting re-
sistor, calculate resistance values using positive and negative clamp values, then use the larger of the calculated
values.
5. This parameter is periodically sampled rather 100% tested.
6. Condition applies to one pin at a time.
7. Determination of actual maximum disruptive input current, which can affect operation, is related to external sys-
tem component values.
INA
– 500
500
A
10
Positive Overvoltage Current Coupling Ratio
1, 5, 6, 8
PQA
PQB
8. Current coupling is the ratio of the current induced from overvoltage (positive or negative, through an external
series coupling resistor), divided by the current induced on adjacent pins. A voltage drop may occur across the
external source impedances of the adjacent pins, impacting conversions on these adjacent pins.
KP
2000
——
11
Negative Overvoltage Current Coupling Ratio
1, 5, 6, 8PQA
PQB
KN
125
500
——
12
VNEGCLAMP = – 0.3 V
VPOSCLAMP = 8 V
IMA
– 25
25
mA