MOS INTEGRATED CIRCUIT
4-BIT SINGLE-CHIP MICROCOMPUTER
The µPD75P108B is a version of the µPD75108 in which the on-chip mask ROM is replaced by one-time
PROM which can be written to once only, or EPROM which is capable of program write, erasure and rewrite.
Also, since the µPD75P108B is capable of program write by a user, it can easily be exchanged with the mask
version, allowing evaluation at low voltage.
Detailed functional descriptions are shown in the following User’s Manual. Be sure to read for designations.
µPD751×× Series User’s Manual : IEM-922
• Version with on-chip PROM, allowing low-voltage operation VDD = 2.7 to 6.0 V
• µPD75108 compatible
• Memory capacity
• Program memory (PROM) : 8064 × 8 bits
• Data memory (RAM)
: 512 × 4 bits
• Correspondence to QTOP™ microcomputer
64-pin plastic shrink DIP (750 mil)
64-pin ceramic shrink DIP (with window)
64-pin plastic QFP (14 × 20 mm, 1.0 mm pitch)
Note There is no on-chip pull-up resistor function by means of a mask option.
Please refer to “Quality grade on NEC Semiconductor Devices” (Document number IEI-1209) published by
NEC Corporation to know the specification of quality grade on the devices and its recommended applications.
In this ducument, common parts of one-time PROM products and EPROM products are represented as
The information in this document is subject to change without notice.
Document No. IC-2580C
(O. D. No. IC-7987C)
Date Published December 1993 P
Printed in Japan
The mark 5 shows major revised points.
© NEC Corporation 1989