M
Note:
PIC16C781/782
Figures 1 through 5 show the input slew rate limits
for normal operation of the voltage comparators in
Fast mode (CMxCON0<3>=1) for a variety of
Common mode voltages, supply voltages and
ambient temperatures.
If the PSMC is used in conjunction with the voltage
comparators, an invalid voltage comparator output
state can cause the premature termination of
PSMC output pulses.
Work around
The pulse rise time of inputs to the voltage com-
parators should be less than the limits shown in
Figures 1 through 5 for the specific conditions of
operation (supply voltage, temperature, Common
mode voltage). The values shown are for pulses
with a constant rise time. For pulses with com-
pound rise times (pulses with non-linear or chang-
ing slopes), the limits may be different.
PIC16C781/782 Rev. B3 Silicon/Data Sheet Errata
The PIC16C781/782 parts you have received conform
functionally to the Device Data Sheet (DS41171A),
except for the anomalies described below.
The silicon revision of a specific compo-
nent is identified by its manufacture date
code: YYWW, YY is the year of manufac-
ture and WW is the specific work week. All
material with a date code of 0229 or later is
revision B3 silicon, and subject to the
Errata contained in this document. Any
components with a earlier date code will be
silicon revision B1 and will be covered in a
separate Errata. For additional information
concerning date codes, refer to the pack-
aging information section of the
PIC16C781/782 data sheet (DS41171A).
Voltage Comparator
1.
Module:
When the voltage comparator inputs are subjected
to fast rise time pulses, some units exhibit a
momentary invalid state on their output. The prob-
ability of generating an invalid output state is
dependant upon four factors:
1. Pulse slew rate
2. Supply Voltage (V
DD
)
3. Ambient Temperature
4. Reference Voltage (V
COMMON
_
MODE
)
Note:
The area below the line for any given tem-
perature is the safe operating area.
Graph data is from B1 revision silicon.
When B3 revision characterization data is
available, the slew rate limits will be
relaxed to reflect the improved perfor-
mance of B3 silicon.
2002 Microchip Technology Inc.
DS80130A-page 1
PIC16C781/782
Clarifications/Corrections to the Data Sheet:
In the Device Data Sheet (DS41171A), the following
clarifications and corrections should be noted.
1.
Module:
I/O Ports
2.
Module:
Digital-to-Analog Converter
Correction to Example 10-1 on page 81.
The following line of code:
“BSF
“BSF
Note:
3.
Module:
ANSEL,1
;set RB1 as analog”
Should be:
ANSEL,5
;set RB1 as analog”
DAC output function overrides ANSEL
and TRISB register control of the port pin.
Comparator Module
Exception to Figure 3-6 on page 32.
When the RA5 pin is configured as the external
MCLR input (CONFIG<MCLRE> = 1), the port bit
will read as set (RA<5> = 1), not cleared, as spec-
ified in Figure 3-6.
Correction to Figure 12-3 on page 95.
The synchronizing clock signal is supplied by the
Timer1 clock, not the RA6 pin as shown in Figure
12-3.
FIGURE 12-3:
COMPARATOR C2 CONFIGURATION WITH OUTPUT SYNCHRONIZED TO
TIMER1 CLOCK
PIC16C78X
C2POL
INPUT
RB2/AN6
-
RA2/AN2/
V
REF
2
+
C2
D
CK
Q
Q
CM2CON0<6>
External Reference
Timer1 Clock
2002 Microchip Technology Inc.
DS80130A-page 5
ST - Low Power RF
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