AUTOMOTIVE 87C51FA/FB/FC/FC-20
PIN DESCRIPTIONS
b
a
range of 40 C to 85 C ambient. For the automo-
tive temperature range option, operational charac-
§
§
teristics are guaranteed over the temperature range
a
tended, and commercial temperature versions of the
MCS-51 product families are available with or with-
out burn-in options.
V
V
V
: Supply voltage.
CC
b
of 40 C to 125 C ambient. The automotive, ex-
§
§
: Circuit ground.
SS
: Secondary ground (in PLCC only). Provided to
SS1
reduce ground bounce and improve power supply
by-passing.
As shown in Figure 2 temperature, burn-in, and
package options are identified by a one- or two-letter
prefix to the part number.
NOTE:
This pin is NOT a substitute for V pin (pin 22).
SS
Port 0: Port 0 is an 8-bit, open drain, bidirectional
I/O port. As an output port each pin can sink several
LS TTL inputs. Port 0 pins that have 1’s written to
them float, and in that state can be used as high-im-
pedance inputs.
270961–2
*Example:
AN87C51FA/FB/FC indicates an automotive temperature range version of the 87C51FA/FB/FC in a PLCC package
with 16 Kbyte/32 Kbyte EPROM program memory.
Figure 2. Package Options
Table 1. Temperature Options
Operating
Temperature
Classification
Temperature
Designation
Burn-In
Options
Temperature
C Ambient
§
b
b
a
Extended
T
L
40 to 85
Standard
Extended
a
40 to 85
b
b
a
Automotive
A
B
40 to 125
Standard
Extended
a
40 to 125
3