38K2 Datasheet, PDF (139/151 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

38K2 Group (L Ver.)
Table 30 Switching characteristics (USB ports) (VCC = 3.00 to 5.25 V, VSS = 0 V, Ta = –20 to 85 °C, unless otherwise noted)
Symbol
Parameter
Limits
Unit
Min.
Typ.
Max.
tfr(D+/D-)
USB full-speed output rising time
CL = 50 pF
4
20
ns
tff(D+/D-)
USB full-speed output rising time
CL = 50 pF
4
20
ns
tlr(D+/D-)
USB low-speed output rising time
CL = 200 to 600 pF
75
300
ns
Ta = 0 to 85 °C
CL = 250 to 600 pF
75
300
ns
Ta = –20 to 85 °C
CL = 200 to 600 pF
65
300
ns
tlf(D+/D-)
Ta = –20 to 85 °C
USB low-speed output falling time
CL = 200 to 600 pF
75
300
ns
Ta = 0 to 85 °C
CL = 250 to 600 pF
75
300
ns
Ta = –20 to 85 °C
CL = 200 to 600 pF
65
300
ns
Ta = –20 to 85 °C
tfrfm(D+/D-)
USB full-speed ports rising/falling ratio tfr(D+/D-)/tff(D+/D-)
90
111.11
%
tlrfm(D+/D-)
USB low-speed ports rising/falling ratio tlr(D+/D-)/tff(D+/D-)
80
125
%
Vcrs(D+/D-)
USB output signal cross-over voltage
1.3
2.0
V
Measured output pin
RL = 27 Ω
RL = 15 kΩ
CL
USB port output
TrON
RL = 27 Ω
Measured output pin
RL = 1.5 kΩ
RL = 15 kΩ
CL
USB port output
Fig. 169 USB output switching characteristics measurement circuit
(1) for D0-, D1+/D2+ (low-speed), D1-/D2- (full-speed)
Fig. 170 USB output switching characteristics measurement circuit
(2) for D0+, D1+/D2+ (full-speed), D1-/D2- (low-speed)
Rev.3.00 Oct 15, 2006 page 139 of 147
REJ03B0193-0300