LC66PG5XX Datasheet, PDF (7/14 Pages) Sanyo Semicon Device – EPROM-Mountable Type 4-bit Microcomputer Evaluation Chip for The LC665XX Series Microcomputers

LC66PG5XX
Power source for EPROM
Normal current drain per EPROM is in the range of 50mA and 100mA. When power capacity of an application product
is not sufficient, power can be supplied to the EPROM from external independent power source. That is, the power source
which is different from that on the application system can be selected.
At the factory shipment, the +5V pin and V_DD pin are connected on the LC66PG5XX. Therefore, power is supplied to the
EPROM from the LC66PG5XX power source terminal (pin64).
Of the power source pads on the package surface, +5V pad is used to supply power to the EPROM.
Note
The LC66PG5XX is a CMOS type IC. This reminds us that latch-up may be caused by input voltage level below the V_SS
level or above the V_DD level. The latch-up is specific to this type of IC and destroys IC device structure or adversely
affects operating functions. You should be careful about the voltage level range of the LC66PG5XX and EPROM. To
start the LC66PG5XX and EPROM operation, first turn on the LC66PG5XX and then the EPROM. To stop the
LC66PG5XX and EPROM operation, first turn off the EPROM and then the LC66PG5XX.
Function selection by options
Select the port 0, port 1 or port 8 output level at the reset, watchdog timer function and internal RAM capacity according
to the options and functions of the microcomputer to be evaluated. Set as below pins 1 to 6 of the 14-pin socket on the
package surface.
Function type
Pin No.
Pin name
Pin setting
Function mode
Port 0, port 1 and
1
Port 8 output level
2
at reset
3
P0HL
P1HL
P8HL
ON
OFF
Port output level "H"
Port output level "L"
Watchdog timer
6
WDC
Internal RAM
4
capacity
5
RAMC0
RAMC1
ON : +5V voltage input, OFF : Open.
ON
OFF
Pin setting
RAMC1
RAMC0
OFF
OFF
OFF
ON
ON
OFF
ON
ON
Operation
Stop
RAM capacity
No setting for the LC665XX
series microcomputers
512W
Pins 14, 13, 12, 11, 10 and 9 of the 14-pin socket are assigned as the +5V terminals. These terminals can be used only for
supplying +5V voltage to the pins 1, 2, 3, 4, 5, and 6.
Note that pin 8 is reserved for future use and should be left open.
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