µPD31172
1.3 External Processing of Pins and Drive Capacity
When using the VRC4172, process the pins externally, as shown in the table below.
(1/2)
Signal Name
External Processing
Drive Capacity
80 pF
80 pF
80 pF
−
Tolerance
SCLK
−
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
5 V
5 V
AD (0:24)
DATA (0:31)
LCDCS#
RD#
−
−
Pull up
Pull upNote 1
80 pF
80 pF
40 pF
80 pF
80 pF
80 pF
80 pF
80 pF
80 pF
80 pF
−
WR#
Pull upNote 1
LCDRDY
ROMCS (2:3)#
CKE
Pull up
Pull up
Pull down
UUCAS#
ULCAS#
MRAS (0:1)#
UCAS#
Pull upNote 1
Pull upNote 1
Pull upNote 1
Pull upNote 1
LCAS#
Pull upNote 1
IOR#
Pull upNote 1
IOW#
Pull upNote 1
−
RESET
−
−
IOCS16#
IOCHRDY
HOLDRQ#
HOLDAK#
SRAS#
Pull up
40 pF
40 pF
40 pF
−
Pull up
−
Pull up
Pull upNote 1
80 pF
80 pF
−
SCAS#
Pull upNote 1
BUSRQ (0:1)#
BUSAK (0:1)#
INTRP
−
−
−
−
−
−
−
−
−
−
40 pF
40 pF
40 pF
40 pF
40 pF
−
IRQ
USBINT#
PS2INT
BUSCLK
ARBCLKSEL
DP (1:2)
DN (1:2)
−
Note 2
Note 2
Notes 1. The same specification has been made for these pins in the VR4121. If these pins have been processed in
the VR4121, there is no need to perform this processing in the VRC4172.
2. In full-speed mode: 50 pF, In low-speed mode: 350 pF
Remark There is no need to perform external processing if no particular external processing has been specified (−).
13
Data Sheet U14388EJ2V0DS00
NEC [ NEC ]
